Merge branch 'master' into pr/837-sunil

aspectj/pom.xml

@@ -98,13 +98,14 @@
                     <execution>
                         <goals>
                             <goal>compile</goal>
-                               <goal>test-compile</goal> 
+                            <goal>test-compile</goal> 
                         </goals>
                     </execution>
                 </executions>
            </plugin>
             
-            <!-- <plugin>
+            <!-- 
+            <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.10</version>
@@ -113,7 +114,8 @@
                     <useSystemClassLoader>true</useSystemClassLoader>
                     <forkMode>always</forkMode>
                 </configuration>
-            </plugin>   -->
+            </plugin>
+             -->
         </plugins>
     </build>
 

aspectj/src/main/java/com/baeldung/aspectj/Account.java

@@ -4,10 +4,10 @@ public class Account {
     int balance = 20;
 
     public boolean withdraw(int amount) {
-        if (balance - amount > 0) {
+        if (balance < amount) {
-            balance = balance - amount;
-            return true;
-        } else
             return false;
+        }
+        balance = balance - amount;
+        return true;
     }
 }

aspectj/src/main/java/com/baeldung/aspectj/AccountAspect.aj

@@ -16,12 +16,11 @@ public aspect AccountAspect {
     }
 
     boolean around(int amount, Account account) : callWithDraw(amount, account) {
-        if (account.balance - amount >= MIN_BALANCE)
+        if (account.balance < amount) {
-            return proceed(amount, account);
-        else {
             logger.info("Withdrawal Rejected!");
             return false;
         }
+        return proceed(amount, account);
     }
 
     after(int amount, Account balance) : callWithDraw(amount, balance) {

core-java/pom.xml

@@ -49,7 +49,7 @@
 		<dependency>
 			<groupId>org.bouncycastle</groupId>
 			<artifactId>bcprov-jdk15on</artifactId>
-			<version>1.55</version>
+			<version>${bouncycastle.version}</version>
 		</dependency>
 		<!-- web -->
 
@@ -134,7 +134,7 @@
 		<dependency>
 			<groupId>commons-codec</groupId>
 			<artifactId>commons-codec</artifactId>
-			<version>1.10</version>
+			<version>${commons-codec.version}</version>
 		</dependency>
 
 	</dependencies>
@@ -338,6 +338,8 @@
 		<!-- util -->
 		<guava.version>19.0</guava.version>
 		<commons-lang3.version>3.4</commons-lang3.version>
+		<bouncycastle.version>1.55</bouncycastle.version>
+		<commons-codec.version>1.10</commons-codec.version>
 
 		<!-- testing -->
 		<org.hamcrest.version>1.3</org.hamcrest.version>

core-java/src/main/java/com/baeldung/generics/Building.java

@@ -0,0 +1,12 @@
+package com.baeldung.generics;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class Building {
+    private static final Logger LOGGER = LoggerFactory.getLogger(Building.class);
+
+    public void paint() {
+        LOGGER.info("Painting Building");
+    }
+}

core-java/src/main/java/com/baeldung/generics/Generics.java

@@ -0,0 +1,31 @@
+package com.baeldung.generics;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public class Generics {
+
+    // definition of a generic method
+    public static <T> List<T> fromArrayToList(T[] a) {
+        return Arrays.stream(a).collect(Collectors.toList());
+    }
+
+    // definition of a generic method
+    public static <T, G> List<G> fromArrayToList(T[] a, Function<T, G> mapperFunction) {
+        return Arrays.stream(a).map(mapperFunction).collect(Collectors.toList());
+    }
+
+    // example of a generic method that has Number as an upper bound for T
+    public static <T extends Number> List<T> fromArrayToListWithUpperBound(T[] a) {
+        return Arrays.stream(a).collect(Collectors.toList());
+    }
+
+    // example of a generic method with a wild card, this method can be used
+    // with a list of any subtype of Building
+    public static void paintAllBuildings(List<? extends Building> buildings) {
+        buildings.forEach(Building::paint);
+    }
+
+}

core-java/src/main/java/com/baeldung/generics/House.java

@@ -0,0 +1,12 @@
+package com.baeldung.generics;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class House extends Building {
+    private static final Logger LOGGER = LoggerFactory.getLogger(House.class);
+
+    public void paint() {
+        LOGGER.info("Painting House");
+    }
+}

core-java/src/main/java/com/baeldung/hashing/SHA256Hashing.java

@@ -1,6 +1,5 @@
 package com.baeldung.hashing;
 
-
 import com.google.common.hash.Hashing;
 import org.apache.commons.codec.digest.DigestUtils;
 import org.bouncycastle.util.encoders.Hex;
@@ -11,17 +10,14 @@ import java.security.NoSuchAlgorithmException;
 
 public class SHA256Hashing {
 
-    public static String HashWithJavaMessageDigest(final String originalString)
+    public static String HashWithJavaMessageDigest(final String originalString) throws NoSuchAlgorithmException {
-            throws NoSuchAlgorithmException {
         final MessageDigest digest = MessageDigest.getInstance("SHA-256");
-        final byte[] encodedhash = digest.digest(
+        final byte[] encodedhash = digest.digest(originalString.getBytes(StandardCharsets.UTF_8));
-                originalString.getBytes(StandardCharsets.UTF_8));
         return bytesToHex(encodedhash);
     }
 
     public static String HashWithGuava(final String originalString) {
-        final String sha256hex = Hashing.sha256().hashString(
+        final String sha256hex = Hashing.sha256().hashString(originalString, StandardCharsets.UTF_8).toString();
-                originalString, StandardCharsets.UTF_8).toString();
         return sha256hex;
     }
 
@@ -30,11 +26,9 @@ public class SHA256Hashing {
         return sha256hex;
     }
 
-    public static String HashWithBouncyCastle(final String originalString)
+    public static String HashWithBouncyCastle(final String originalString) throws NoSuchAlgorithmException {
-            throws NoSuchAlgorithmException {
         final MessageDigest digest = MessageDigest.getInstance("SHA-256");
-        final byte[] hash = digest.digest(
+        final byte[] hash = digest.digest(originalString.getBytes(StandardCharsets.UTF_8));
-                originalString.getBytes(StandardCharsets.UTF_8));
         final String sha256hex = new String(Hex.encode(hash));
         return sha256hex;
     }
@@ -43,7 +37,8 @@ public class SHA256Hashing {
         StringBuffer hexString = new StringBuffer();
         for (int i = 0; i < hash.length; i++) {
             String hex = Integer.toHexString(0xff & hash[i]);
-            if(hex.length() == 1) hexString.append('0');
+            if (hex.length() == 1)
+                hexString.append('0');
             hexString.append(hex);
         }
         return hexString.toString();

core-java/src/main/java/com/baeldung/java/nio2/visitor/FileSearchExample.java

@@ -0,0 +1,56 @@
+package com.baeldung.java.nio2.visitor;
+
+import java.io.IOException;
+import java.nio.file.*;
+import java.nio.file.attribute.BasicFileAttributes;
+
+import static java.nio.file.FileVisitResult.CONTINUE;
+import static java.nio.file.FileVisitResult.TERMINATE;
+
+public class FileSearchExample implements FileVisitor<Path> {
+    private final String fileName;
+    private final Path startDir;
+
+    public FileSearchExample(String fileName, Path startingDir) {
+        this.fileName = fileName;
+        startDir = startingDir;
+    }
+
+    @Override
+    public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
+        return CONTINUE;
+    }
+
+    @Override
+    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+        String fileName = file.getFileName().toString();
+        if (this.fileName.equals(fileName)) {
+            System.out.println("File found: " + file.toString());
+            return TERMINATE;
+        }
+        return CONTINUE;
+    }
+
+    @Override
+    public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
+        System.out.println("Failed to access file: " + file.toString());
+        return CONTINUE;
+    }
+
+    @Override
+    public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
+        boolean finishedSearch = Files.isSameFile(dir, startDir);
+        if (finishedSearch) {
+            System.out.println("File:" + fileName + " not found");
+            return TERMINATE;
+        }
+        return CONTINUE;
+    }
+
+    public static void main(String[] args) throws IOException {
+        Path startingDir = Paths.get("C:/Users/new/Desktop");
+        FileSearchExample crawler = new FileSearchExample("hibernate.txt", startingDir);
+        Files.walkFileTree(startingDir, crawler);
+    }
+
+}

core-java/src/main/java/com/baeldung/java/nio2/visitor/FileVisitorImpl.java

@@ -0,0 +1,30 @@
+package com.baeldung.java.nio2.visitor;
+
+import java.io.IOException;
+import java.nio.file.FileVisitResult;
+import java.nio.file.FileVisitor;
+import java.nio.file.Path;
+import java.nio.file.attribute.BasicFileAttributes;
+
+public class FileVisitorImpl implements FileVisitor<Path> {
+
+    @Override
+    public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
+        return null;
+    }
+
+    @Override
+    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
+        return null;
+    }
+
+    @Override
+    public FileVisitResult visitFileFailed(Path file, IOException exc) {
+        return null;
+    }
+
+    @Override
+    public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
+        return null;
+    }
+}

core-java/src/main/java/com/baeldung/java/nio2/watcher/DirectoryWatcherExample.java

@@ -0,0 +1,25 @@
+package com.baeldung.java.nio2.watcher;
+
+import java.io.IOException;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardWatchEventKinds;
+import java.nio.file.WatchEvent;
+import java.nio.file.WatchKey;
+import java.nio.file.WatchService;
+
+public class DirectoryWatcherExample {
+    public static void main(String[] args) throws IOException, InterruptedException {
+        WatchService watchService = FileSystems.getDefault().newWatchService();
+        Path path = Paths.get(System.getProperty("user.home"));
+        path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE, StandardWatchEventKinds.ENTRY_MODIFY);
+        WatchKey key;
+        while ((key = watchService.take()) != null) {
+            for (WatchEvent<?> event : key.pollEvents()) {
+                System.out.println("Event kind:" + event.kind() + ". File affected: " + event.context() + ".");
+            }
+            key.reset();
+        }
+    }
+}

core-java/src/main/java/com/baeldung/java_8_features/Person.java

@@ -0,0 +1,39 @@
+package com.baeldung.java_8_features;
+
+import java.util.Optional;
+
+public class Person {
+    private String name;
+    private int age;
+    private String password;
+
+    public Person(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public Optional<String> getName() {
+        return Optional.ofNullable(name);
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Optional<Integer> getAge() {
+        return Optional.ofNullable(age);
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public Optional<String> getPassword() {
+        return Optional.ofNullable(password);
+    }
+
+}

core-java/src/test/java/com/baeldung/file/FileOperationsUnitTest.java

@@ -1,11 +1,12 @@
 package com.baeldung.file;
 
-import java.io.BufferedReader;
+import org.apache.commons.io.FileUtils;
-import java.io.File;
+import org.hamcrest.CoreMatchers;
-import java.io.FileInputStream;
+import org.hamcrest.Matchers;
-import java.io.IOException;
+import org.junit.Assert;
-import java.io.InputStream;
+import org.junit.Test;
-import java.io.InputStreamReader;
+
+import java.io.*;
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLConnection;
@@ -14,12 +15,6 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.stream.Stream;
 
-import org.apache.commons.io.FileUtils;
-import org.hamcrest.CoreMatchers;
-import org.hamcrest.Matchers;
-import org.junit.Assert;
-import org.junit.Test;
-
 public class FileOperationsUnitTest {
 
     @Test
@@ -58,9 +53,9 @@ public class FileOperationsUnitTest {
 
     @Test
     public void givenURLName_whenUsingURL_thenFileData() throws IOException {
-        String expectedData = "Baeldung";
+        String expectedData = "Example Domain";
 
-        URL urlObject = new URL("http://www.baeldung.com/");
+        URL urlObject = new URL("http://www.example.com/");
 
         URLConnection urlConnection = urlObject.openConnection();
 

core-java/src/test/java/com/baeldung/generics/GenericsTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.generics;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.hasItems;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.fail;
+
+public class GenericsTest {
+
+    // testing the generic method with Integer
+    @Test
+    public void givenArrayOfIntegers_thanListOfIntegersReturnedOK() {
+        Integer[] intArray = { 1, 2, 3, 4, 5 };
+        List<Integer> list = Generics.fromArrayToList(intArray);
+
+        assertThat(list, hasItems(intArray));
+    }
+
+    // testing the generic method with Integer and String type
+    @Test
+    public void givenArrayOfIntegers_thanListOfStringReturnedOK() {
+        Integer[] intArray = { 1, 2, 3, 4, 5 };
+        List<String> stringList = Generics.fromArrayToList(intArray, Object::toString);
+        assertThat(stringList, hasItems("1", "2", "3", "4", "5"));
+    }
+
+    // testing the generic method with String
+    @Test
+    public void givenArrayOfStrings_thanListOfStringsReturnedOK() {
+        String[] stringArray = { "hello1", "hello2", "hello3", "hello4", "hello5" };
+        List<String> list = Generics.fromArrayToList(stringArray);
+
+        assertThat(list, hasItems(stringArray));
+    }
+
+    // testing the generic method with Number as upper bound with Integer
+    // if we test fromArrayToListWithUpperBound with any type that doesn't
+    // extend Number it will fail to compile
+    @Test
+    public void givenArrayOfIntegersAndNumberUpperBound_thanListOfIntegersReturnedOK() {
+        Integer[] intArray = { 1, 2, 3, 4, 5 };
+        List<Integer> list = Generics.fromArrayToListWithUpperBound(intArray);
+
+        assertThat(list, hasItems(intArray));
+    }
+
+    // testing paintAllBuildings method with a subtype of Building, the method
+    // will work with all subtypes of Building
+    @Test
+    public void givenSubTypeOfWildCardBoundedGenericType_thanPaintingOK() {
+        try {
+            List<Building> subBuildingsList = new ArrayList<>();
+            subBuildingsList.add(new Building());
+            subBuildingsList.add(new House());
+
+            // prints
+            // Painting Building
+            // Painting House
+            Generics.paintAllBuildings(subBuildingsList);
+        } catch (Exception e) {
+            fail();
+        }
+    }
+
+}

core-java/src/test/java/com/baeldung/hashing/SHA256HashingTest.java

@@ -4,12 +4,10 @@ import org.junit.Test;
 
 import static org.junit.Assert.*;
 
-
 public class SHA256HashingTest {
 
     private static String originalValue = "abc123";
-    private static String hashedValue =
+    private static String hashedValue = "6ca13d52ca70c883e0f0bb101e425a89e8624de51db2d2392593af6a84118090";
-            "6ca13d52ca70c883e0f0bb101e425a89e8624de51db2d2392593af6a84118090";
 
     @Test
     public void testHashWithJavaMessageDigest() throws Exception {

core-java/src/test/java/com/baeldung/java/conversion/StringConversionTest.java

@@ -119,8 +119,7 @@ public class StringConversionTest {
         int afterConvCalendarDay = 03;
         Month afterConvCalendarMonth = Month.DECEMBER;
         int afterConvCalendarYear = 2007;
-        LocalDateTime afterConvDate 
+        LocalDateTime afterConvDate = new UseLocalDateTime().getLocalDateTimeUsingParseMethod(str);
-          = new UseLocalDateTime().getLocalDateTimeUsingParseMethod(str);
 
         assertEquals(afterConvDate.getDayOfMonth(), afterConvCalendarDay);
         assertEquals(afterConvDate.getMonth(), afterConvCalendarMonth);

core-java/src/test/java/com/baeldung/java/networking/interfaces/NetworkInterfaceTest.java

@@ -1,122 +0,0 @@
-package com.baeldung.java.networking.interfaces;
-
-import static org.junit.Assert.*;
-
-import java.net.InetAddress;
-import java.net.InterfaceAddress;
-import java.net.NetworkInterface;
-import java.net.SocketException;
-import java.net.UnknownHostException;
-import java.util.Enumeration;
-import java.util.List;
-
-import org.junit.Test;
-
-public class NetworkInterfaceTest {
-    @Test
-    public void givenName_whenReturnsNetworkInterface_thenCorrect() throws SocketException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        assertNotNull(nif);
-    }
-
-    @Test
-    public void givenInExistentName_whenReturnsNull_thenCorrect() throws SocketException {
-        NetworkInterface nif = NetworkInterface.getByName("inexistent_name");
-        assertNull(nif);
-    }
-
-    @Test
-    public void givenIP_whenReturnsNetworkInterface_thenCorrect() throws SocketException, UnknownHostException {
-        byte[] ip = new byte[] { 127, 0, 0, 1 };
-        NetworkInterface nif = NetworkInterface.getByInetAddress(InetAddress.getByAddress(ip));
-        assertNotNull(nif);
-    }
-
-    @Test
-    public void givenHostName_whenReturnsNetworkInterface_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByInetAddress(InetAddress.getByName("localhost"));
-        assertNotNull(nif);
-    }
-
-    @Test
-    public void givenLocalHost_whenReturnsNetworkInterface_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByInetAddress(InetAddress.getLocalHost());
-        assertNotNull(nif);
-    }
-
-    @Test
-    public void givenLoopBack_whenReturnsNetworkInterface_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByInetAddress(InetAddress.getLoopbackAddress());
-        assertNotNull(nif);
-    }
-
-    @Test
-    public void givenIndex_whenReturnsNetworkInterface_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByIndex(0);
-        assertNotNull(nif);
-    }
-
-    @Test
-    public void givenInterface_whenReturnsInetAddresses_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        Enumeration<InetAddress> addressEnum = nif.getInetAddresses();
-        InetAddress address = addressEnum.nextElement();
-        assertEquals("127.0.0.1", address.getHostAddress());
-    }
-
-    @Test
-    public void givenInterface_whenReturnsInterfaceAddresses_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-
-        List<InterfaceAddress> addressEnum = nif.getInterfaceAddresses();
-        InterfaceAddress address = addressEnum.get(0);
-        InetAddress localAddress = address.getAddress();
-        InetAddress broadCastAddress = address.getBroadcast();
-        assertEquals("127.0.0.1", localAddress.getHostAddress());
-        assertEquals("127.255.255.255", broadCastAddress.getHostAddress());
-    }
-
-    @Test
-    public void givenInterface_whenChecksIfLoopback_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        assertTrue(nif.isLoopback());
-    }
-
-    @Test
-    public void givenInterface_whenChecksIfUp_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        assertTrue(nif.isUp());
-    }
-
-    @Test
-    public void givenInterface_whenChecksIfPointToPoint_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        assertFalse(nif.isPointToPoint());
-    }
-
-    @Test
-    public void givenInterface_whenChecksIfVirtual_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        assertFalse(nif.isVirtual());
-    }
-
-    @Test
-    public void givenInterface_whenChecksMulticastSupport_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        assertTrue(nif.supportsMulticast());
-    }
-
-    @Test
-    public void givenInterface_whenGetsMacAddress_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("lo");
-        byte[] bytes = nif.getHardwareAddress();
-        assertNotNull(bytes);
-    }
-
-    @Test
-    public void givenInterface_whenGetsMTU_thenCorrect() throws SocketException, UnknownHostException {
-        NetworkInterface nif = NetworkInterface.getByName("net0");
-        int mtu = nif.getMTU();
-        assertEquals(1500, mtu);
-    }
-}

core-java/src/test/java/com/baeldung/java/nio2/FileTest.java

@@ -1,64 +1,72 @@
 package com.baeldung.java.nio2;
 
+import org.apache.commons.io.FileUtils;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.*;
+import java.util.UUID;
+
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
-import java.io.IOException;
-import java.nio.file.DirectoryNotEmptyException;
-import java.nio.file.FileAlreadyExistsException;
-import java.nio.file.Files;
-import java.nio.file.NoSuchFileException;
-import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.nio.file.StandardCopyOption;
-import java.util.UUID;
-
-import org.junit.Test;
-
 public class FileTest {
-    private static final String HOME = System.getProperty("user.home");
+    private static final String TEMP_DIR = String.format("%s/temp%s", System.getProperty("user.home"), UUID.randomUUID().toString());
+
+    @BeforeClass
+    public static void setup() throws IOException {
+        Files.createDirectory(Paths.get(TEMP_DIR));
+    }
+
+    @AfterClass
+    public static void cleanup() throws IOException {
+        FileUtils.deleteDirectory(new File(TEMP_DIR));
+    }
 
     // checking file or dir
     @Test
     public void givenExistentPath_whenConfirmsFileExists_thenCorrect() {
-        Path p = Paths.get(HOME);
+        Path p = Paths.get(TEMP_DIR);
         assertTrue(Files.exists(p));
     }
 
     @Test
     public void givenNonexistentPath_whenConfirmsFileNotExists_thenCorrect() {
-        Path p = Paths.get(HOME + "/inexistent_file.txt");
+        Path p = Paths.get(TEMP_DIR + "/inexistent_file.txt");
         assertTrue(Files.notExists(p));
     }
 
     @Test
     public void givenDirPath_whenConfirmsNotRegularFile_thenCorrect() {
-        Path p = Paths.get(HOME);
+        Path p = Paths.get(TEMP_DIR);
         assertFalse(Files.isRegularFile(p));
     }
 
     @Test
     public void givenExistentDirPath_whenConfirmsReadable_thenCorrect() {
-        Path p = Paths.get(HOME);
+        Path p = Paths.get(TEMP_DIR);
         assertTrue(Files.isReadable(p));
     }
 
     @Test
     public void givenExistentDirPath_whenConfirmsWritable_thenCorrect() {
-        Path p = Paths.get(HOME);
+        Path p = Paths.get(System.getProperty("user.home"));
         assertTrue(Files.isWritable(p));
     }
 
     @Test
     public void givenExistentDirPath_whenConfirmsExecutable_thenCorrect() {
-        Path p = Paths.get(HOME);
+        Path p = Paths.get(System.getProperty("user.home"));
         assertTrue(Files.isExecutable(p));
     }
 
     @Test
     public void givenSameFilePaths_whenConfirmsIsSame_thenCorrect() throws IOException {
-        Path p1 = Paths.get(HOME);
+        Path p1 = Paths.get(TEMP_DIR);
-        Path p2 = Paths.get(HOME);
+        Path p2 = Paths.get(TEMP_DIR);
         assertTrue(Files.isSameFile(p1, p2));
     }
 
@@ -67,7 +75,7 @@ public class FileTest {
     @Test
     public void givenFilePath_whenCreatesNewFile_thenCorrect() throws IOException {
         String fileName = "myfile_" + UUID.randomUUID().toString() + ".txt";
-        Path p = Paths.get(HOME + "/" + fileName);
+        Path p = Paths.get(TEMP_DIR + "/" + fileName);
         assertFalse(Files.exists(p));
         Files.createFile(p);
         assertTrue(Files.exists(p));
@@ -77,7 +85,7 @@ public class FileTest {
     @Test
     public void givenDirPath_whenCreatesNewDir_thenCorrect() throws IOException {
         String dirName = "myDir_" + UUID.randomUUID().toString();
-        Path p = Paths.get(HOME + "/" + dirName);
+        Path p = Paths.get(TEMP_DIR + "/" + dirName);
         assertFalse(Files.exists(p));
         Files.createDirectory(p);
         assertTrue(Files.exists(p));
@@ -89,7 +97,7 @@ public class FileTest {
     @Test(expected = NoSuchFileException.class)
     public void givenDirPath_whenFailsToCreateRecursively_thenCorrect() throws IOException {
         String dirName = "myDir_" + UUID.randomUUID().toString() + "/subdir";
-        Path p = Paths.get(HOME + "/" + dirName);
+        Path p = Paths.get(TEMP_DIR + "/" + dirName);
         assertFalse(Files.exists(p));
         Files.createDirectory(p);
 
@@ -97,7 +105,7 @@ public class FileTest {
 
     @Test
     public void givenDirPath_whenCreatesRecursively_thenCorrect() throws IOException {
-        Path dir = Paths.get(HOME + "/myDir_" + UUID.randomUUID().toString());
+        Path dir = Paths.get(TEMP_DIR + "/myDir_" + UUID.randomUUID().toString());
         Path subdir = dir.resolve("subdir");
         assertFalse(Files.exists(dir));
         assertFalse(Files.exists(subdir));
@@ -110,7 +118,7 @@ public class FileTest {
     public void givenFilePath_whenCreatesTempFile_thenCorrect() throws IOException {
         String prefix = "log_";
         String suffix = ".txt";
-        Path p = Paths.get(HOME + "/");
+        Path p = Paths.get(TEMP_DIR + "/");
         p = Files.createTempFile(p, prefix, suffix);
         // like log_8821081429012075286.txt
         assertTrue(Files.exists(p));
@@ -119,7 +127,7 @@ public class FileTest {
 
     @Test
     public void givenPath_whenCreatesTempFileWithDefaults_thenCorrect() throws IOException {
-        Path p = Paths.get(HOME + "/");
+        Path p = Paths.get(TEMP_DIR + "/");
         p = Files.createTempFile(p, null, null);
         // like 8600179353689423985.tmp
         assertTrue(Files.exists(p));
@@ -136,7 +144,7 @@ public class FileTest {
     // delete file
     @Test
     public void givenPath_whenDeletes_thenCorrect() throws IOException {
-        Path p = Paths.get(HOME + "/fileToDelete.txt");
+        Path p = Paths.get(TEMP_DIR + "/fileToDelete.txt");
         assertFalse(Files.exists(p));
         Files.createFile(p);
         assertTrue(Files.exists(p));
@@ -147,7 +155,7 @@ public class FileTest {
 
     @Test(expected = DirectoryNotEmptyException.class)
     public void givenPath_whenFailsToDeleteNonEmptyDir_thenCorrect() throws IOException {
-        Path dir = Paths.get(HOME + "/emptyDir" + UUID.randomUUID().toString());
+        Path dir = Paths.get(TEMP_DIR + "/emptyDir" + UUID.randomUUID().toString());
         Files.createDirectory(dir);
         assertTrue(Files.exists(dir));
         Path file = dir.resolve("file.txt");
@@ -160,7 +168,7 @@ public class FileTest {
 
     @Test(expected = NoSuchFileException.class)
     public void givenInexistentFile_whenDeleteFails_thenCorrect() throws IOException {
-        Path p = Paths.get(HOME + "/inexistentFile.txt");
+        Path p = Paths.get(TEMP_DIR + "/inexistentFile.txt");
         assertFalse(Files.exists(p));
         Files.delete(p);
 
@@ -168,7 +176,7 @@ public class FileTest {
 
     @Test
     public void givenInexistentFile_whenDeleteIfExistsWorks_thenCorrect() throws IOException {
-        Path p = Paths.get(HOME + "/inexistentFile.txt");
+        Path p = Paths.get(TEMP_DIR + "/inexistentFile.txt");
         assertFalse(Files.exists(p));
         Files.deleteIfExists(p);
 
@@ -177,8 +185,8 @@ public class FileTest {
     // copy file
     @Test
     public void givenFilePath_whenCopiesToNewLocation_thenCorrect() throws IOException {
-        Path dir1 = Paths.get(HOME + "/firstdir_" + UUID.randomUUID().toString());
+        Path dir1 = Paths.get(TEMP_DIR + "/firstdir_" + UUID.randomUUID().toString());
-        Path dir2 = Paths.get(HOME + "/otherdir_" + UUID.randomUUID().toString());
+        Path dir2 = Paths.get(TEMP_DIR + "/otherdir_" + UUID.randomUUID().toString());
         Files.createDirectory(dir1);
         Files.createDirectory(dir2);
         Path file1 = dir1.resolve("filetocopy.txt");
@@ -193,8 +201,8 @@ public class FileTest {
 
     @Test(expected = FileAlreadyExistsException.class)
     public void givenPath_whenCopyFailsDueToExistingFile_thenCorrect() throws IOException {
-        Path dir1 = Paths.get(HOME + "/firstdir_" + UUID.randomUUID().toString());
+        Path dir1 = Paths.get(TEMP_DIR + "/firstdir_" + UUID.randomUUID().toString());
-        Path dir2 = Paths.get(HOME + "/otherdir_" + UUID.randomUUID().toString());
+        Path dir2 = Paths.get(TEMP_DIR + "/otherdir_" + UUID.randomUUID().toString());
         Files.createDirectory(dir1);
         Files.createDirectory(dir2);
         Path file1 = dir1.resolve("filetocopy.txt");
@@ -210,8 +218,8 @@ public class FileTest {
     // moving files
     @Test
     public void givenFilePath_whenMovesToNewLocation_thenCorrect() throws IOException {
-        Path dir1 = Paths.get(HOME + "/firstdir_" + UUID.randomUUID().toString());
+        Path dir1 = Paths.get(TEMP_DIR + "/firstdir_" + UUID.randomUUID().toString());
-        Path dir2 = Paths.get(HOME + "/otherdir_" + UUID.randomUUID().toString());
+        Path dir2 = Paths.get(TEMP_DIR + "/otherdir_" + UUID.randomUUID().toString());
         Files.createDirectory(dir1);
         Files.createDirectory(dir2);
         Path file1 = dir1.resolve("filetocopy.txt");
@@ -227,8 +235,8 @@ public class FileTest {
 
     @Test(expected = FileAlreadyExistsException.class)
     public void givenFilePath_whenMoveFailsDueToExistingFile_thenCorrect() throws IOException {
-        Path dir1 = Paths.get(HOME + "/firstdir_" + UUID.randomUUID().toString());
+        Path dir1 = Paths.get(TEMP_DIR + "/firstdir_" + UUID.randomUUID().toString());
-        Path dir2 = Paths.get(HOME + "/otherdir_" + UUID.randomUUID().toString());
+        Path dir2 = Paths.get(TEMP_DIR + "/otherdir_" + UUID.randomUUID().toString());
         Files.createDirectory(dir1);
         Files.createDirectory(dir2);
         Path file1 = dir1.resolve("filetocopy.txt");

core-java/src/test/java/com/baeldung/java/nio2/PathTest.java

@@ -1,195 +0,0 @@
-package com.baeldung.java.nio2;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-
-import java.io.IOException;
-import java.net.URI;
-import java.nio.file.NoSuchFileException;
-import java.nio.file.Path;
-import java.nio.file.Paths;
-import java.util.Date;
-
-import org.junit.Test;
-
-public class PathTest {
-
-    private static final String HOME = System.getProperty("user.home");
-
-    // creating a path
-    @Test
-    public void givenPathString_whenCreatesPathObject_thenCorrect() {
-        Path p = Paths.get("/articles/baeldung");
-        assertEquals("\\articles\\baeldung", p.toString());
-
-    }
-
-    @Test
-    public void givenPathParts_whenCreatesPathObject_thenCorrect() {
-        Path p = Paths.get("/articles", "baeldung");
-        assertEquals("\\articles\\baeldung", p.toString());
-
-    }
-
-    // retrieving path info
-    @Test
-    public void givenPath_whenRetrievesFileName_thenCorrect() {
-        Path p = Paths.get("/articles/baeldung/logs");
-        assertEquals("logs", p.getFileName().toString());
-    }
-
-    @Test
-    public void givenPath_whenRetrievesNameByIndex_thenCorrect() {
-        Path p = Paths.get("/articles/baeldung/logs");
-        assertEquals("articles", p.getName(0).toString());
-        assertEquals("baeldung", p.getName(1).toString());
-        assertEquals("logs", p.getName(2).toString());
-    }
-
-    @Test
-    public void givenPath_whenCountsParts_thenCorrect() {
-        Path p = Paths.get("/articles/baeldung/logs");
-        assertEquals(3, p.getNameCount());
-    }
-
-    @Test
-    public void givenPath_whenCanRetrieveSubsequenceByIndex_thenCorrect() {
-        Path p = Paths.get("/articles/baeldung/logs");
-        assertEquals("articles", p.subpath(0, 1).toString());
-        assertEquals("articles\\baeldung", p.subpath(0, 2).toString());
-        assertEquals("articles\\baeldung\\logs", p.subpath(0, 3).toString());
-        assertEquals("baeldung", p.subpath(1, 2).toString());
-        assertEquals("baeldung\\logs", p.subpath(1, 3).toString());
-        assertEquals("logs", p.subpath(2, 3).toString());
-    }
-
-    @Test
-    public void givenPath_whenRetrievesParent_thenCorrect() {
-        Path p1 = Paths.get("/articles/baeldung/logs");
-        Path p2 = Paths.get("/articles/baeldung");
-        Path p3 = Paths.get("/articles");
-        Path p4 = Paths.get("/");
-
-        assertEquals("\\articles\\baeldung", p1.getParent().toString());
-        assertEquals("\\articles", p2.getParent().toString());
-        assertEquals("\\", p3.getParent().toString());
-        assertEquals(null, p4.getParent());
-    }
-
-    @Test
-    public void givenPath_whenRetrievesRoot_thenCorrect() {
-        Path p1 = Paths.get("/articles/baeldung/logs");
-        Path p2 = Paths.get("c:/articles/baeldung/logs");
-
-        assertEquals("\\", p1.getRoot().toString());
-        assertEquals("c:\\", p2.getRoot().toString());
-    }
-
-    // removing redundancies from path
-    @Test
-    public void givenPath_whenRemovesRedundancies_thenCorrect1() {
-        Path p = Paths.get("/home/./baeldung/articles");
-        p = p.normalize();
-        assertEquals("\\home\\baeldung\\articles", p.toString());
-    }
-
-    @Test
-    public void givenPath_whenRemovesRedundancies_thenCorrect2() {
-        Path p = Paths.get("/home/baeldung/../articles");
-        p = p.normalize();
-        assertEquals("\\home\\articles", p.toString());
-    }
-
-    // converting a path
-    @Test
-    public void givenPath_whenConvertsToBrowseablePath_thenCorrect() {
-        Path p = Paths.get("/home/baeldung/articles.html");
-        URI uri = p.toUri();
-        assertEquals("file:///E:/home/baeldung/articles.html", uri.toString());
-    }
-
-    @Test
-    public void givenPath_whenConvertsToAbsolutePath_thenCorrect() {
-        Path p = Paths.get("/home/baeldung/articles.html");
-        assertEquals("E:\\home\\baeldung\\articles.html", p.toAbsolutePath().toString());
-    }
-
-    @Test
-    public void givenAbsolutePath_whenRetainsAsAbsolute_thenCorrect() {
-        Path p = Paths.get("E:\\home\\baeldung\\articles.html");
-        assertEquals("E:\\home\\baeldung\\articles.html", p.toAbsolutePath().toString());
-    }
-
-    @Test
-    public void givenExistingPath_whenGetsRealPathToFile_thenCorrect() throws IOException {
-        Path p = Paths.get(HOME);
-        assertEquals(HOME, p.toRealPath().toString());
-    }
-
-    @Test(expected = NoSuchFileException.class)
-    public void givenInExistentPath_whenFailsToConvert_thenCorrect() throws IOException {
-        Path p = Paths.get("E:\\home\\baeldung\\articles.html");
-
-        p.toRealPath();
-    }
-
-    // joining paths
-    @Test
-    public void givenTwoPaths_whenJoinsAndResolves_thenCorrect() throws IOException {
-        Path p = Paths.get("/baeldung/articles");
-        assertEquals("\\baeldung\\articles\\java", p.resolve("java").toString());
-    }
-
-    @Test
-    public void givenAbsolutePath_whenResolutionRetainsIt_thenCorrect() throws IOException {
-        Path p = Paths.get("/baeldung/articles");
-        assertEquals("C:\\baeldung\\articles\\java", p.resolve("C:\\baeldung\\articles\\java").toString());
-    }
-
-    @Test
-    public void givenPathWithRoot_whenResolutionRetainsIt_thenCorrect2() throws IOException {
-        Path p = Paths.get("/baeldung/articles");
-        assertEquals("\\java", p.resolve("/java").toString());
-    }
-
-    // creating a path between 2 paths
-    @Test
-    public void givenSiblingPaths_whenCreatesPathToOther_thenCorrect() throws IOException {
-        Path p1 = Paths.get("articles");
-        Path p2 = Paths.get("authors");
-        assertEquals("..\\authors", p1.relativize(p2).toString());
-        assertEquals("..\\articles", p2.relativize(p1).toString());
-    }
-
-    @Test
-    public void givenNonSiblingPaths_whenCreatesPathToOther_thenCorrect() throws IOException {
-        Path p1 = Paths.get("/baeldung");
-        Path p2 = Paths.get("/baeldung/authors/articles");
-        assertEquals("authors\\articles", p1.relativize(p2).toString());
-        assertEquals("..\\..", p2.relativize(p1).toString());
-    }
-
-    // comparing 2 paths
-    @Test
-    public void givenTwoPaths_whenTestsEquality_thenCorrect() throws IOException {
-        Path p1 = Paths.get("/baeldung/articles");
-        Path p2 = Paths.get("/baeldung/articles");
-        Path p3 = Paths.get("/baeldung/authors");
-
-        assertTrue(p1.equals(p2));
-        assertFalse(p1.equals(p3));
-    }
-
-    @Test
-    public void givenPath_whenInspectsStart_thenCorrect() {
-        Path p1 = Paths.get("/baeldung/articles");
-        assertTrue(p1.startsWith("/baeldung"));
-    }
-
-    @Test
-    public void givenPath_whenInspectsEnd_thenCorrect() {
-        Path p1 = Paths.get("/baeldung/articles");
-        assertTrue(p1.endsWith("articles"));
-    }
-}

core-java/src/test/java/com/baeldung/java/nio2/async/AsyncEchoClient.java

@@ -0,0 +1,86 @@
+package com.baeldung.java.nio2.async;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousSocketChannel;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+public class AsyncEchoClient {
+    private AsynchronousSocketChannel client;
+    private Future<Void> future;
+    private static AsyncEchoClient instance;
+
+    private AsyncEchoClient() {
+        try {
+            client = AsynchronousSocketChannel.open();
+            InetSocketAddress hostAddress = new InetSocketAddress("localhost", 4999);
+            future = client.connect(hostAddress);
+            start();
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static AsyncEchoClient getInstance() {
+        if (instance == null)
+            instance = new AsyncEchoClient();
+        return instance;
+    }
+
+    private void start() {
+        try {
+            future.get();
+        } catch (InterruptedException | ExecutionException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public String sendMessage(String message) {
+        byte[] byteMsg = message.getBytes();
+        ByteBuffer buffer = ByteBuffer.wrap(byteMsg);
+        Future<Integer> writeResult = client.write(buffer);
+
+        try {
+            writeResult.get();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        buffer.flip();
+        Future<Integer> readResult = client.read(buffer);
+        try {
+            readResult.get();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        String echo = new String(buffer.array()).trim();
+        buffer.clear();
+        return echo;
+    }
+
+    public void stop() {
+        try {
+            client.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        AsyncEchoClient client = AsyncEchoClient.getInstance();
+        client.start();
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        String line;
+        System.out.println("Message to server:");
+        while ((line = br.readLine()) != null) {
+            String response = client.sendMessage(line);
+            System.out.println("response from server: " + response);
+            System.out.println("Message to server:");
+        }
+    }
+
+}

core-java/src/test/java/com/baeldung/java/nio2/async/AsyncEchoServer.java

@@ -0,0 +1,80 @@
+package com.baeldung.java.nio2.async;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousServerSocketChannel;
+import java.nio.channels.AsynchronousSocketChannel;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+public class AsyncEchoServer {
+    private AsynchronousServerSocketChannel serverChannel;
+    private Future<AsynchronousSocketChannel> acceptResult;
+    private AsynchronousSocketChannel clientChannel;
+
+    public AsyncEchoServer() {
+        try {
+            serverChannel = AsynchronousServerSocketChannel.open();
+            InetSocketAddress hostAddress = new InetSocketAddress("localhost", 4999);
+            serverChannel.bind(hostAddress);
+            acceptResult = serverChannel.accept();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void runServer() {
+        try {
+            clientChannel = acceptResult.get();
+            if ((clientChannel != null) && (clientChannel.isOpen())) {
+                while (true) {
+
+                    ByteBuffer buffer = ByteBuffer.allocate(32);
+                    Future<Integer> readResult = clientChannel.read(buffer);
+
+                    // do some computation
+
+                    readResult.get();
+
+                    buffer.flip();
+                    String message = new String(buffer.array()).trim();
+                    if (message.equals("bye")) {
+                        break; // while loop
+                    }
+                    buffer = ByteBuffer.wrap(new String(message).getBytes());
+                    Future<Integer> writeResult = clientChannel.write(buffer);
+
+                    // do some computation
+                    writeResult.get();
+                    buffer.clear();
+
+                } // while()
+
+                clientChannel.close();
+                serverChannel.close();
+
+            }
+        } catch (InterruptedException | ExecutionException | IOException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    public static void main(String[] args) {
+        AsyncEchoServer server = new AsyncEchoServer();
+        server.runServer();
+    }
+
+    public static Process start() throws IOException, InterruptedException {
+        String javaHome = System.getProperty("java.home");
+        String javaBin = javaHome + File.separator + "bin" + File.separator + "java";
+        String classpath = System.getProperty("java.class.path");
+        String className = AsyncEchoServer.class.getCanonicalName();
+
+        ProcessBuilder builder = new ProcessBuilder(javaBin, "-cp", classpath, className);
+
+        return builder.start();
+    }
+}

core-java/src/test/java/com/baeldung/java/nio2/async/AsyncEchoServer2.java

@@ -0,0 +1,99 @@
+package com.baeldung.java.nio2.async;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousServerSocketChannel;
+import java.nio.channels.AsynchronousSocketChannel;
+import java.nio.channels.CompletionHandler;
+import java.util.HashMap;
+import java.util.Map;
+
+public class AsyncEchoServer2 {
+    private AsynchronousServerSocketChannel serverChannel;
+    private AsynchronousSocketChannel clientChannel;
+
+    public AsyncEchoServer2() {
+        try {
+            serverChannel = AsynchronousServerSocketChannel.open();
+            InetSocketAddress hostAddress = new InetSocketAddress("localhost", 4999);
+            serverChannel.bind(hostAddress);
+            while (true) {
+
+                serverChannel.accept(null, new CompletionHandler<AsynchronousSocketChannel, Object>() {
+
+                    @Override
+                    public void completed(AsynchronousSocketChannel result, Object attachment) {
+                        if (serverChannel.isOpen())
+                            serverChannel.accept(null, this);
+                        clientChannel = result;
+                        if ((clientChannel != null) && (clientChannel.isOpen())) {
+                            ReadWriteHandler handler = new ReadWriteHandler();
+                            ByteBuffer buffer = ByteBuffer.allocate(32);
+                            Map<String, Object> readInfo = new HashMap<>();
+                            readInfo.put("action", "read");
+                            readInfo.put("buffer", buffer);
+                            clientChannel.read(buffer, readInfo, handler);
+                        }
+                    }
+
+                    @Override
+                    public void failed(Throwable exc, Object attachment) {
+                        // process error
+                    }
+                });
+                try {
+                    System.in.read();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    class ReadWriteHandler implements CompletionHandler<Integer, Map<String, Object>> {
+
+        @Override
+        public void completed(Integer result, Map<String, Object> attachment) {
+            Map<String, Object> actionInfo = attachment;
+            String action = (String) actionInfo.get("action");
+            if ("read".equals(action)) {
+                ByteBuffer buffer = (ByteBuffer) actionInfo.get("buffer");
+                buffer.flip();
+                actionInfo.put("action", "write");
+                clientChannel.write(buffer, actionInfo, this);
+                buffer.clear();
+            } else if ("write".equals(action)) {
+                ByteBuffer buffer = ByteBuffer.allocate(32);
+                actionInfo.put("action", "read");
+                actionInfo.put("buffer", buffer);
+                clientChannel.read(buffer, actionInfo, this);
+            }
+
+        }
+
+        @Override
+        public void failed(Throwable exc, Map<String, Object> attachment) {
+
+        }
+
+    }
+
+    public static void main(String[] args) {
+        new AsyncEchoServer2();
+    }
+
+    public static Process start() throws IOException, InterruptedException {
+        String javaHome = System.getProperty("java.home");
+        String javaBin = javaHome + File.separator + "bin" + File.separator + "java";
+        String classpath = System.getProperty("java.class.path");
+        String className = AsyncEchoServer2.class.getCanonicalName();
+
+        ProcessBuilder builder = new ProcessBuilder(javaBin, "-cp", classpath, className);
+
+        return builder.start();
+    }
+}

core-java/src/test/java/com/baeldung/java/nio2/async/AsyncEchoTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.java.nio2.async;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+
+public class AsyncEchoTest {
+
+    Process server;
+    AsyncEchoClient client;
+
+    @Before
+    public void setup() throws IOException, InterruptedException {
+        server = AsyncEchoServer2.start();
+        client = AsyncEchoClient.getInstance();
+    }
+
+    @Test
+    public void givenServerClient_whenServerEchosMessage_thenCorrect() throws Exception {
+        String resp1 = client.sendMessage("hello");
+        String resp2 = client.sendMessage("world");
+        assertEquals("hello", resp1);
+        assertEquals("world", resp2);
+    }
+
+    @After
+    public void teardown() throws IOException {
+        server.destroy();
+        client.stop();
+    }
+
+}

core-java/src/test/java/com/baeldung/java/nio2/async/AsyncFileTest.java

@@ -0,0 +1,126 @@
+package com.baeldung.java.nio2.async;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.net.URI;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousFileChannel;
+import java.nio.channels.CompletionHandler;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.UUID;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+import static org.junit.Assert.assertEquals;
+
+public class AsyncFileTest {
+    @Test
+    public void givenPath_whenReadsContentWithFuture_thenCorrect() throws IOException, ExecutionException, InterruptedException {
+        Path path = Paths.get(URI.create(this.getClass().getClassLoader().getResource("file.txt").toString()));
+        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.READ);
+
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+
+        Future<Integer> operation = fileChannel.read(buffer, 0);
+
+        operation.get();
+
+        String fileContent = new String(buffer.array()).trim();
+        buffer.clear();
+
+        assertEquals(fileContent, "baeldung.com");
+    }
+
+    @Test
+    public void givenPath_whenReadsContentWithCompletionHandler_thenCorrect() throws IOException {
+        Path path = Paths.get(URI.create(AsyncFileTest.class.getResource("/file.txt").toString()));
+        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.READ);
+
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+
+        fileChannel.read(buffer, 0, buffer, new CompletionHandler<Integer, ByteBuffer>() {
+
+            @Override
+            public void completed(Integer result, ByteBuffer attachment) {
+                // result is number of bytes read
+                // attachment is the buffer
+
+            }
+
+            @Override
+            public void failed(Throwable exc, ByteBuffer attachment) {
+
+            }
+        });
+    }
+
+    @Test
+    public void givenPathAndContent_whenWritesToFileWithFuture_thenCorrect() throws IOException, ExecutionException, InterruptedException {
+        String fileName = "temp";
+        Path path = Paths.get(fileName);
+        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.CREATE);
+
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        long position = 0;
+
+        buffer.put("hello world".getBytes());
+        buffer.flip();
+
+        Future<Integer> operation = fileChannel.write(buffer, position);
+        buffer.clear();
+
+        operation.get();
+
+        String content = readContent(path);
+        assertEquals("hello world", content);
+    }
+
+    @Test
+    public void givenPathAndContent_whenWritesToFileWithHandler_thenCorrect() throws IOException {
+        String fileName = UUID.randomUUID().toString();
+        Path path = Paths.get(fileName);
+        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.DELETE_ON_CLOSE);
+
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        buffer.put("hello world".getBytes());
+        buffer.flip();
+
+        fileChannel.write(buffer, 0, buffer, new CompletionHandler<Integer, ByteBuffer>() {
+
+            @Override
+            public void completed(Integer result, ByteBuffer attachment) {
+                // result is number of bytes written
+                // attachment is the buffer
+
+            }
+
+            @Override
+            public void failed(Throwable exc, ByteBuffer attachment) {
+
+            }
+        });
+    }
+
+    public static String readContent(Path file) throws ExecutionException, InterruptedException {
+        AsynchronousFileChannel fileChannel = null;
+        try {
+            fileChannel = AsynchronousFileChannel.open(file, StandardOpenOption.READ);
+        } catch (IOException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+
+        Future<Integer> operation = fileChannel.read(buffer, 0);
+
+        operation.get();
+
+        String fileContent = new String(buffer.array()).trim();
+        buffer.clear();
+        return fileContent;
+    }
+}

core-java/src/test/java/com/baeldung/java/nio2/attributes/BasicAttribsTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.java.nio2.attributes;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.BasicFileAttributeView;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.nio.file.attribute.FileTime;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class BasicAttribsTest {
+    private static final String HOME = System.getProperty("user.home");
+    private static BasicFileAttributes basicAttribs;
+
+    @BeforeClass
+    public static void setup() throws IOException {
+        Path home = Paths.get(HOME);
+        BasicFileAttributeView basicView = Files.getFileAttributeView(home, BasicFileAttributeView.class);
+        basicAttribs = basicView.readAttributes();
+    }
+
+    @Test
+    public void givenFileTimes_whenComparesThem_ThenCorrect() {
+        FileTime created = basicAttribs.creationTime();
+        FileTime modified = basicAttribs.lastModifiedTime();
+        FileTime accessed = basicAttribs.lastAccessTime();
+
+        System.out.println("Created: " + created);
+        System.out.println("Modified: " + modified);
+        System.out.println("Accessed: " + accessed);
+
+    }
+
+    @Test
+    public void givenPath_whenGetsFileSize_thenCorrect() {
+        long size = basicAttribs.size();
+        assertTrue(size > 0);
+    }
+
+    @Test
+    public void givenPath_whenChecksIfDirectory_thenCorrect() {
+        boolean isDir = basicAttribs.isDirectory();
+        assertTrue(isDir);
+    }
+
+    @Test
+    public void givenPath_whenChecksIfFile_thenCorrect() {
+        boolean isFile = basicAttribs.isRegularFile();
+        assertFalse(isFile);
+    }
+
+    @Test
+    public void givenPath_whenChecksIfSymLink_thenCorrect() {
+        boolean isSymLink = basicAttribs.isSymbolicLink();
+        assertFalse(isSymLink);
+    }
+
+    @Test
+    public void givenPath_whenChecksIfOther_thenCorrect() {
+        boolean isOther = basicAttribs.isOther();
+        assertFalse(isOther);
+    }
+}

core-java/src/test/java/com/baeldung/java8/optional/OptionalTest.java

@@ -0,0 +1,206 @@
+package com.baeldung.java8.optional;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Optional;
+
+import org.junit.Test;
+
+import com.baeldung.java_8_features.Person;
+
+public class OptionalTest {
+    // creating Optional
+    @Test
+    public void whenCreatesEmptyOptional_thenCorrect() {
+        Optional<String> empty = Optional.empty();
+        assertFalse(empty.isPresent());
+    }
+
+    @Test
+    public void givenNonNull_whenCreatesNonNullable_thenCorrect() {
+        String name = "baeldung";
+        Optional.of(name);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenNull_whenThrowsErrorOnCreate_thenCorrect() {
+        String name = null;
+        Optional<String> opt = Optional.of(name);
+    }
+
+    @Test
+    public void givenNonNull_whenCreatesOptional_thenCorrect() {
+        String name = "baeldung";
+        Optional<String> opt = Optional.of(name);
+        assertEquals("Optional[baeldung]", opt.toString());
+    }
+
+    @Test
+    public void givenNonNull_whenCreatesNullable_thenCorrect() {
+        String name = "baeldung";
+        Optional<String> opt = Optional.ofNullable(name);
+        assertEquals("Optional[baeldung]", opt.toString());
+    }
+
+    @Test
+    public void givenNull_whenCreatesNullable_thenCorrect() {
+        String name = null;
+        Optional<String> opt = Optional.ofNullable(name);
+        assertEquals("Optional.empty", opt.toString());
+    }
+    // Checking Value With isPresent()
+
+    @Test
+    public void givenOptional_whenIsPresentWorks_thenCorrect() {
+        Optional<String> opt = Optional.of("Baeldung");
+        assertTrue(opt.isPresent());
+
+        opt = Optional.ofNullable(null);
+        assertFalse(opt.isPresent());
+    }
+
+    // Condition Action With ifPresent()
+    @Test
+    public void givenOptional_whenIfPresentWorks_thenCorrect() {
+        Optional<String> opt = Optional.of("baeldung");
+        opt.ifPresent(name -> System.out.println(name.length()));
+    }
+
+    // returning Value With get()
+    @Test
+    public void givenOptional_whenGetsValue_thenCorrect() {
+        Optional<String> opt = Optional.of("baeldung");
+        String name = opt.get();
+        assertEquals("baeldung", name);
+    }
+
+    @Test(expected = NoSuchElementException.class)
+    public void givenOptionalWithNull_whenGetThrowsException_thenCorrect() {
+        Optional<String> opt = Optional.ofNullable(null);
+        String name = opt.get();
+    }
+
+    // Conditional Return With filter()
+    @Test
+    public void whenOptionalFilterWorks_thenCorrect() {
+        Integer year = 2016;
+        Optional<Integer> yearOptional = Optional.of(year);
+        boolean is2016 = yearOptional.filter(y -> y == 2016).isPresent();
+        assertTrue(is2016);
+        boolean is2017 = yearOptional.filter(y -> y == 2017).isPresent();
+        assertFalse(is2017);
+    }
+
+    // Transforming Value With map()
+    @Test
+    public void givenOptional_whenMapWorks_thenCorrect() {
+        List<String> companyNames = Arrays.asList("paypal", "oracle", "", "microsoft", "", "apple");
+        Optional<List<String>> listOptional = Optional.of(companyNames);
+
+        int size = listOptional.map(List::size).orElse(0);
+        assertEquals(6, size);
+    }
+
+    @Test
+    public void givenOptional_whenMapWorks_thenCorrect2() {
+        String name = "baeldung";
+        Optional<String> nameOptional = Optional.of(name);
+
+        int len = nameOptional.map(String::length).orElse(0);
+        assertEquals(8, len);
+    }
+
+    @Test
+    public void givenOptional_whenMapWorksWithFilter_thenCorrect() {
+        String password = " password ";
+        Optional<String> passOpt = Optional.of(password);
+        boolean correctPassword = passOpt.filter(pass -> pass.equals("password")).isPresent();
+        assertFalse(correctPassword);
+
+        correctPassword = passOpt.map(String::trim).filter(pass -> pass.equals("password")).isPresent();
+        assertTrue(correctPassword);
+    }
+
+    // Transforming Value With flatMap()
+    @Test
+    public void givenOptional_whenFlatMapWorks_thenCorrect2() {
+        Person person = new Person("john", 26);
+        Optional<Person> personOptional = Optional.of(person);
+
+        Optional<Optional<String>> nameOptionalWrapper = personOptional.map(Person::getName);
+        Optional<String> nameOptional = nameOptionalWrapper.orElseThrow(IllegalArgumentException::new);
+        String name1 = nameOptional.orElseThrow(IllegalArgumentException::new);
+        assertEquals("john", name1);
+
+        String name = personOptional.flatMap(Person::getName).orElseThrow(IllegalArgumentException::new);
+        assertEquals("john", name);
+    }
+
+    @Test
+    public void givenOptional_whenFlatMapWorksWithFilter_thenCorrect() {
+        Person person = new Person("john", 26);
+        person.setPassword("password");
+        Optional<Person> personOptional = Optional.of(person);
+
+        String password = personOptional.flatMap(Person::getPassword).filter(cleanPass -> cleanPass.equals("password")).orElseThrow(IllegalArgumentException::new);
+        assertEquals("password", password);
+    }
+
+    // Default Value With orElse
+    @Test
+    public void whenOrElseWorks_thenCorrect() {
+        String nullName = null;
+        String name = Optional.ofNullable(nullName).orElse("john");
+        assertEquals("john", name);
+    }
+
+    // Default Value With orElseGet
+    @Test
+    public void whenOrElseGetWorks_thenCorrect() {
+        String nullName = null;
+        String name = Optional.ofNullable(nullName).orElseGet(() -> "john");
+        assertEquals("john", name);
+
+    }
+
+    @Test
+    public void whenOrElseGetAndOrElseOverlap_thenCorrect() {
+        String text = null;
+        System.out.println("Using orElseGet:");
+        String defaultText = Optional.ofNullable(text).orElseGet(this::getMyDefault);
+        assertEquals("Default Value", defaultText);
+
+        System.out.println("Using orElse:");
+        defaultText = Optional.ofNullable(text).orElse(getMyDefault());
+        assertEquals("Default Value", defaultText);
+    }
+
+    @Test
+    public void whenOrElseGetAndOrElseDiffer_thenCorrect() {
+        String text = "Text present";
+        System.out.println("Using orElseGet:");
+        String defaultText = Optional.ofNullable(text).orElseGet(this::getMyDefault);
+        assertEquals("Text present", defaultText);
+
+        System.out.println("Using orElse:");
+        defaultText = Optional.ofNullable(text).orElse(getMyDefault());
+        assertEquals("Text present", defaultText);
+    }
+
+    // Exceptions With orElseThrow
+    @Test(expected = IllegalArgumentException.class)
+    public void whenOrElseThrowWorks_thenCorrect() {
+        String nullName = null;
+        String name = Optional.ofNullable(nullName).orElseThrow(IllegalArgumentException::new);
+    }
+
+    public String getMyDefault() {
+        System.out.println("Getting default value...");
+        return "Default Value";
+    }
+}

core-java/src/test/java/org/baeldung/java/collections/CollectionsConcatenateUnitTest.java

@@ -0,0 +1,110 @@
+package org.baeldung.java.collections;
+
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static java.util.Arrays.asList;
+
+public class CollectionsConcatenateUnitTest {
+
+    @Test
+    public void givenUsingJava8_whenConcatenatingUsingConcat_thenCorrect() {
+        Collection<String> collectionA = asList("S", "T");
+        Collection<String> collectionB = asList("U", "V");
+        Collection<String> collectionC = asList("W", "X");
+
+        Stream<String> combinedStream = Stream.concat(Stream.concat(collectionA.stream(), collectionB.stream()), collectionC.stream());
+        Collection<String> collectionCombined = combinedStream.collect(Collectors.toList());
+
+        Assert.assertEquals(asList("S", "T", "U", "V", "W", "X"), collectionCombined);
+    }
+
+    @Test
+    public void givenUsingJava8_whenConcatenatingUsingflatMap_thenCorrect() {
+        Collection<String> collectionA = asList("S", "T");
+        Collection<String> collectionB = asList("U", "V");
+
+        Stream<String> combinedStream = Stream.of(collectionA, collectionB).flatMap(Collection::stream);
+        Collection<String> collectionCombined = combinedStream.collect(Collectors.toList());
+
+        Assert.assertEquals(asList("S", "T", "U", "V"), collectionCombined);
+    }
+
+    @Test
+    public void givenUsingGuava_whenConcatenatingUsingIterables_thenCorrect() {
+        Collection<String> collectionA = asList("S", "T");
+        Collection<String> collectionB = asList("U", "V");
+
+        Iterable<String> combinedIterables = Iterables.unmodifiableIterable(Iterables.concat(collectionA, collectionB));
+        Collection<String> collectionCombined = Lists.newArrayList(combinedIterables);
+
+        Assert.assertEquals(asList("S", "T", "U", "V"), collectionCombined);
+    }
+
+    @Test
+    public void givenUsingJava7_whenConcatenatingUsingIterables_thenCorrect() {
+        Collection<String> collectionA = asList("S", "T");
+        Collection<String> collectionB = asList("U", "V");
+
+        Iterable<String> combinedIterables = concat(collectionA, collectionB);
+        Collection<String> collectionCombined = makeListFromIterable(combinedIterables);
+        Assert.assertEquals(Arrays.asList("S", "T", "U", "V"), collectionCombined);
+    }
+
+    public static <E> Iterable<E> concat(Iterable<? extends E> i1, Iterable<? extends E> i2) {
+        return new Iterable<E>() {
+            public Iterator<E> iterator() {
+                return new Iterator<E>() {
+                    Iterator<? extends E> listIterator = i1.iterator();
+                    Boolean checkedHasNext;
+                    E nextValue;
+                    private boolean startTheSecond;
+
+                    void theNext() {
+                        if (listIterator.hasNext()) {
+                            checkedHasNext = true;
+                            nextValue = listIterator.next();
+                        } else if (startTheSecond)
+                            checkedHasNext = false;
+                        else {
+                            startTheSecond = true;
+                            listIterator = i2.iterator();
+                            theNext();
+                        }
+                    }
+
+                    public boolean hasNext() {
+                        if (checkedHasNext == null)
+                            theNext();
+                        return checkedHasNext;
+                    }
+
+                    public E next() {
+                        if (!hasNext())
+                            throw new NoSuchElementException();
+                        checkedHasNext = null;
+                        return nextValue;
+                    }
+
+                    public void remove() {
+                        listIterator.remove();
+                    }
+                };
+            }
+        };
+    }
+
+    public static <E> List<E> makeListFromIterable(Iterable<E> iter) {
+        List<E> list = new ArrayList<>();
+        for (E item : iter) {
+            list.add(item);
+        }
+        return list;
+    }
+}

core-java/src/test/java/org/baeldung/java/collections/JoinSplitCollectionsUnitTest.java

@@ -0,0 +1,154 @@
+package org.baeldung.java.collections;
+
+import org.junit.Test;
+
+import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.junit.Assert.*;
+
+public class JoinSplitCollectionsUnitTest {
+
+    @Test
+    public void whenJoiningTwoArrays_thenJoined() {
+        String[] animals1 = new String[] { "Dog", "Cat" };
+        String[] animals2 = new String[] { "Bird", "Cow" };
+        String[] result = Stream.concat(Arrays.stream(animals1), Arrays.stream(animals2)).toArray(String[]::new);
+
+        assertArrayEquals(result, new String[] { "Dog", "Cat", "Bird", "Cow" });
+    }
+
+    @Test
+    public void whenJoiningTwoCollections_thenJoined() {
+        Collection<Integer> collection1 = Arrays.asList(7, 8, 9);
+        Collection<Integer> collection2 = Arrays.asList(10, 11, 12);
+        Collection<Integer> result = Stream.concat(collection1.stream(), collection2.stream()).collect(Collectors.toList());
+
+        assertTrue(result.equals(Arrays.asList(7, 8, 9, 10, 11, 12)));
+    }
+
+    @Test
+    public void whenJoiningTwoCollectionsWithFilter_thenJoined() {
+        Collection<Integer> collection1 = Arrays.asList(7, 8, 11);
+        Collection<Integer> collection2 = Arrays.asList(9, 12, 10);
+        Collection<Integer> result = Stream.concat(collection1.stream(), collection2.stream()).filter(next -> next <= 10).collect(Collectors.toList());
+
+        assertTrue(result.equals(Arrays.asList(7, 8, 9, 10)));
+    }
+
+    @Test
+    public void whenConvertArrayToString_thenConverted() {
+        String[] colors = new String[] { "Red", "Blue", "Green", "Yellow" };
+        String result = Arrays.stream(colors).collect(Collectors.joining(", "));
+
+        assertEquals(result, "Red, Blue, Green, Yellow");
+    }
+
+    @Test
+    public void whenConvertCollectionToString_thenConverted() {
+        Collection<String> directions = Arrays.asList("Left", "Right", "Top", "Bottom");
+        String result = directions.stream().collect(Collectors.joining(", "));
+
+        assertEquals(result, "Left, Right, Top, Bottom");
+    }
+
+    @Test
+    public void whenConvertMapToString_thenConverted() {
+        Map<Integer, String> users = new HashMap<>();
+        users.put(1, "John Doe");
+        users.put(2, "Paul Smith");
+        users.put(3, "Susan Anderson");
+
+        String result = users.entrySet().stream().map(entry -> entry.getKey() + " = " + entry.getValue()).collect(Collectors.joining(", "));
+
+        assertEquals(result, "1 = John Doe, 2 = Paul Smith, 3 = Susan Anderson");
+    }
+
+    @Test
+    public void whenConvertNestedCollectionToString_thenConverted() {
+        Collection<List<String>> nested = new ArrayList<>();
+        nested.add(Arrays.asList("Left", "Right", "Top", "Bottom"));
+        nested.add(Arrays.asList("Red", "Blue", "Green", "Yellow"));
+
+        String result = nested.stream().map(nextList -> nextList.stream().collect(Collectors.joining("-"))).collect(Collectors.joining("; "));
+
+        assertEquals(result, "Left-Right-Top-Bottom; Red-Blue-Green-Yellow");
+    }
+
+    @Test
+    public void whenConvertCollectionToStringAndSkipNull_thenConverted() {
+        Collection<String> fruits = Arrays.asList("Apple", "Orange", null, "Grape");
+        String result = fruits.stream().filter(Objects::nonNull).collect(Collectors.joining(", "));
+
+        assertEquals(result, "Apple, Orange, Grape");
+    }
+
+    @Test
+    public void whenSplitCollectionHalf_thenConverted() {
+        Collection<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        Collection<Integer> result1 = new ArrayList<>();
+        Collection<Integer> result2 = new ArrayList<>();
+        AtomicInteger count = new AtomicInteger();
+        int midpoint = Math.round(numbers.size() / 2);
+
+        numbers.forEach(next -> {
+            int index = count.getAndIncrement();
+            if (index < midpoint) {
+                result1.add(next);
+            } else {
+                result2.add(next);
+            }
+        });
+
+        assertTrue(result1.equals(Arrays.asList(1, 2, 3, 4, 5)));
+        assertTrue(result2.equals(Arrays.asList(6, 7, 8, 9, 10)));
+    }
+
+    @Test
+    public void whenSplitArrayByWordLength_thenConverted() {
+        String[] words = new String[] { "bye", "cold", "it", "and", "my", "word" };
+        Map<Integer, List<String>> result = Arrays.stream(words).collect(Collectors.groupingBy(String::length));
+
+        assertTrue(result.get(2).equals(Arrays.asList("it", "my")));
+        assertTrue(result.get(3).equals(Arrays.asList("bye", "and")));
+        assertTrue(result.get(4).equals(Arrays.asList("cold", "word")));
+    }
+
+    @Test
+    public void whenConvertStringToArray_thenConverted() {
+        String colors = "Red, Blue, Green, Yellow";
+        String[] result = colors.split(", ");
+
+        assertArrayEquals(result, new String[] { "Red", "Blue", "Green", "Yellow" });
+    }
+
+    @Test
+    public void whenConvertStringToCollection_thenConverted() {
+        String colors = "Left, Right, Top, Bottom";
+        Collection<String> result = Arrays.asList(colors.split(", "));
+
+        assertTrue(result.equals(Arrays.asList("Left", "Right", "Top", "Bottom")));
+    }
+
+    @Test
+    public void whenConvertStringToMap_thenConverted() {
+        String users = "1 = John Doe, 2 = Paul Smith, 3 = Susan Anderson";
+
+        Map<Integer, String> result = Arrays.stream(users.split(", ")).map(next -> next.split(" = ")).collect(Collectors.toMap(entry -> Integer.parseInt(entry[0]), entry -> entry[1]));
+
+        assertEquals(result.get(1), "John Doe");
+        assertEquals(result.get(2), "Paul Smith");
+        assertEquals(result.get(3), "Susan Anderson");
+    }
+
+    @Test
+    public void whenConvertCollectionToStringMultipleSeparators_thenConverted() {
+        String fruits = "Apple. , Orange, Grape. Lemon";
+
+        Collection<String> result = Arrays.stream(fruits.split("[,|.]")).map(String::trim).filter(next -> !next.isEmpty()).collect(Collectors.toList());
+
+        assertTrue(result.equals(Arrays.asList("Apple", "Orange", "Grape", "Lemon")));
+    }
+}

core-java/src/test/java/org/baeldung/java/io/JavaFileUnitTest.java

@@ -1,7 +1,9 @@
 package org.baeldung.java.io;
 
-import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
+import org.apache.commons.io.FileUtils;
-import static org.junit.Assert.assertTrue;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.io.File;
 import java.io.IOException;
@@ -9,17 +11,28 @@ import java.nio.file.FileSystemException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.UUID;
 
-import org.apache.commons.io.FileUtils;
+import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
-import org.junit.Test;
+import static org.junit.Assert.assertTrue;
 
 public class JavaFileUnitTest {
 
-    // create a file
+    private static final String TEMP_DIR = "src/test/resources/temp" + UUID.randomUUID().toString();
+
+    @BeforeClass
+    public static void setup() throws IOException {
+        Files.createDirectory(Paths.get(TEMP_DIR));
+    }
+
+    @AfterClass
+    public static void cleanup() throws IOException {
+        FileUtils.deleteDirectory(new File(TEMP_DIR));
+    }
 
     @Test
     public final void givenUsingJDK6_whenCreatingFile_thenCorrect() throws IOException {
-        final File newFile = new File("src/test/resources/newFile_jdk6.txt");
+        final File newFile = new File(TEMP_DIR + "/newFile_jdk6.txt");
         final boolean success = newFile.createNewFile();
 
         assertTrue(success);
@@ -27,48 +40,48 @@ public class JavaFileUnitTest {
 
     @Test
     public final void givenUsingJDK7nio2_whenCreatingFile_thenCorrect() throws IOException {
-        final Path newFilePath = Paths.get("src/test/resources/newFile_jdk7.txt");
+        final Path newFilePath = Paths.get(TEMP_DIR + "/newFile_jdk7.txt");
         Files.createFile(newFilePath);
     }
 
     @Test
     public final void givenUsingCommonsIo_whenCreatingFile_thenCorrect() throws IOException {
-        FileUtils.touch(new File("src/test/resources/newFile_commonsio.txt"));
+        FileUtils.touch(new File(TEMP_DIR + "/newFile_commonsio.txt"));
     }
 
     @Test
     public final void givenUsingGuava_whenCreatingFile_thenCorrect() throws IOException {
-        com.google.common.io.Files.touch(new File("src/test/resources/newFile_guava.txt"));
+        com.google.common.io.Files.touch(new File(TEMP_DIR + "/newFile_guava.txt"));
     }
 
     // move a file
 
     @Test
     public final void givenUsingJDK6_whenMovingFile_thenCorrect() throws IOException {
-        final File fileToMove = new File("src/test/resources/toMoveFile_jdk6.txt");
+        final File fileToMove = new File(TEMP_DIR + "/toMoveFile_jdk6.txt");
         fileToMove.createNewFile();// .exists();
-        final File destDir = new File("src/test/resources/");
+        final File destDir = new File(TEMP_DIR + "/");
         destDir.mkdir();
 
-        final boolean isMoved = fileToMove.renameTo(new File("src/test/resources/movedFile_jdk6.txt"));
+        final boolean isMoved = fileToMove.renameTo(new File(TEMP_DIR + "/movedFile_jdk6.txt"));
         if (!isMoved) {
-            throw new FileSystemException("src/test/resources/movedFile_jdk6.txt");
+            throw new FileSystemException(TEMP_DIR + "/movedFile_jdk6.txt");
         }
     }
 
     @Test
     public final void givenUsingJDK7Nio2_whenMovingFile_thenCorrect() throws IOException {
-        final Path fileToMovePath = Files.createFile(Paths.get("src/test/resources/" + randomAlphabetic(5) + ".txt"));
+        final Path fileToMovePath = Files.createFile(Paths.get(TEMP_DIR + "/" + randomAlphabetic(5) + ".txt"));
-        final Path targetPath = Paths.get("src/main/resources/");
+        final Path targetPath = Paths.get(TEMP_DIR + "/");
 
         Files.move(fileToMovePath, targetPath.resolve(fileToMovePath.getFileName()));
     }
 
     @Test
     public final void givenUsingGuava_whenMovingFile_thenCorrect() throws IOException {
-        final File fileToMove = new File("src/test/resources/fileToMove.txt");
+        final File fileToMove = new File(TEMP_DIR + "/fileToMove.txt");
         fileToMove.createNewFile();
-        final File destDir = new File("src/main/resources/");
+        final File destDir = new File(TEMP_DIR + "/temp");
         final File targetFile = new File(destDir, fileToMove.getName());
         com.google.common.io.Files.createParentDirs(targetFile);
         com.google.common.io.Files.move(fileToMove, targetFile);
@@ -76,23 +89,24 @@ public class JavaFileUnitTest {
 
     @Test
     public final void givenUsingApache_whenMovingFile_thenCorrect() throws IOException {
-        FileUtils.touch(new File("src/test/resources/fileToMove_apache.txt"));
+        FileUtils.touch(new File(TEMP_DIR + "/fileToMove_apache.txt"));
-        FileUtils.moveFile(FileUtils.getFile("src/test/resources/fileToMove_apache.txt"), FileUtils.getFile("src/test/resources/fileMoved_apache2.txt"));
+        FileUtils.moveFile(FileUtils.getFile(TEMP_DIR + "/fileToMove_apache.txt"), FileUtils.getFile(TEMP_DIR + "/fileMoved_apache2.txt"));
     }
 
     @Test
     public final void givenUsingApache_whenMovingFileApproach2_thenCorrect() throws IOException {
-        FileUtils.touch(new File("src/test/resources/fileToMove_apache.txt"));
+        FileUtils.touch(new File(TEMP_DIR + "/fileToMove_apache.txt"));
-        FileUtils.moveFileToDirectory(FileUtils.getFile("src/test/resources/fileToMove_apache.txt"), FileUtils.getFile("src/main/resources/"), true);
+        Files.createDirectory(Paths.get(TEMP_DIR + "/temp"));
+        FileUtils.moveFileToDirectory(FileUtils.getFile(TEMP_DIR + "/fileToMove_apache.txt"), FileUtils.getFile(TEMP_DIR + "/temp"), true);
     }
 
     // delete a file
 
     @Test
     public final void givenUsingJDK6_whenDeletingAFile_thenCorrect() throws IOException {
-        new File("src/test/resources/fileToDelete_jdk6.txt").createNewFile();
+        new File(TEMP_DIR + "/fileToDelete_jdk6.txt").createNewFile();
 
-        final File fileToDelete = new File("src/test/resources/fileToDelete_jdk6.txt");
+        final File fileToDelete = new File(TEMP_DIR + "/fileToDelete_jdk6.txt");
         final boolean success = fileToDelete.delete();
 
         assertTrue(success);
@@ -100,17 +114,17 @@ public class JavaFileUnitTest {
 
     @Test
     public final void givenUsingJDK7nio2_whenDeletingAFile_thenCorrect() throws IOException {
-        Files.createFile(Paths.get("src/test/resources/fileToDelete_jdk7.txt"));
+        Files.createFile(Paths.get(TEMP_DIR + "/fileToDelete_jdk7.txt"));
 
-        final Path fileToDeletePath = Paths.get("src/test/resources/fileToDelete_jdk7.txt");
+        final Path fileToDeletePath = Paths.get(TEMP_DIR + "/fileToDelete_jdk7.txt");
         Files.delete(fileToDeletePath);
     }
 
     @Test
     public final void givenUsingCommonsIo_whenDeletingAFileV1_thenCorrect() throws IOException {
-        FileUtils.touch(new File("src/test/resources/fileToDelete_commonsIo.txt"));
+        FileUtils.touch(new File(TEMP_DIR + "/fileToDelete_commonsIo.txt"));
 
-        final File fileToDelete = FileUtils.getFile("src/test/resources/fileToDelete_commonsIo.txt");
+        final File fileToDelete = FileUtils.getFile(TEMP_DIR + "/fileToDelete_commonsIo.txt");
         final boolean success = FileUtils.deleteQuietly(fileToDelete);
 
         assertTrue(success);
@@ -118,9 +132,9 @@ public class JavaFileUnitTest {
 
     @Test
     public void givenUsingCommonsIo_whenDeletingAFileV2_thenCorrect() throws IOException {
-        FileUtils.touch(new File("src/test/resources/fileToDelete.txt"));
+        FileUtils.touch(new File(TEMP_DIR + "/fileToDelete.txt"));
 
-        FileUtils.forceDelete(FileUtils.getFile("src/test/resources/fileToDelete.txt"));
+        FileUtils.forceDelete(FileUtils.getFile(TEMP_DIR + "/fileToDelete.txt"));
     }
 
 }

core-java/src/test/java/org/baeldung/java/sorting/Employee.java

@@ -0,0 +1,55 @@
+package org.baeldung.java.sorting;
+
+public class Employee implements Comparable {
+
+    private String name;
+    private int age;
+    private double salary;
+
+    public Employee(String name, int age, double salary) {
+        this.name = name;
+        this.age = age;
+        this.salary = salary;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return ((Employee) obj).getName().equals(getName());
+    }
+
+    @Override
+    public int compareTo(Object o) {
+        Employee e = (Employee) o;
+        return getName().compareTo(e.getName());
+    }
+
+    @Override
+    public String toString() {
+        return new StringBuffer().append("(").append(getName()).append(getAge()).append(",").append(getSalary()).append(")").toString();
+    }
+
+}

core-java/src/test/java/org/baeldung/java/sorting/JavaSorting.java

@@ -0,0 +1,186 @@
+package org.baeldung.java.sorting;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.apache.commons.lang3.ArrayUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.google.common.primitives.Ints;
+
+public class JavaSorting {
+
+    private int[] toSort;
+    private int[] sortedInts;
+    private int[] sortedRangeInts;
+    // private Integer [] integers;
+    // private Integer [] sortedIntegers;
+    // private List<Integer> integersList;
+    // private List<Integer> sortedIntegersList;
+    private Employee[] employees;
+    private Employee[] employeesSorted;
+    private Employee[] employeesSortedByAge;
+    private HashMap<Integer, String> map;
+
+    @Before
+    public void initVariables() {
+
+        toSort = new int[] { 5, 1, 89, 255, 7, 88, 200, 123, 66 };
+        sortedInts = new int[] { 1, 5, 7, 66, 88, 89, 123, 200, 255 };
+        sortedRangeInts = new int[] { 5, 1, 89, 7, 88, 200, 255, 123, 66 };
+
+        // integers = new Integer[]
+        // { 5, 1, 89, 255, 7, 88, 200, 123, 66 };
+        // sortedIntegers = new Integer[]
+        // {1, 5, 7, 66, 88, 89, 123, 200, 255};
+        //
+        // integersList = Arrays.asList(new Integer[] { 5, 1, 89, 255, 7, 88, 200, 123, 66 });
+        // sortedIntegersList = Arrays.asList(new Integer[] {1, 5, 7, 66, 88, 89, 123, 200, 255});
+
+        employees = new Employee[] { new Employee("John", 23, 5000), new Employee("Steve", 26, 6000), new Employee("Frank", 33, 7000), new Employee("Earl", 43, 10000), new Employee("Jessica", 23, 4000), new Employee("Pearl", 33, 6000) };
+        employeesSorted = new Employee[] { new Employee("Earl", 43, 10000), new Employee("Frank", 33, 70000), new Employee("Jessica", 23, 4000), new Employee("John", 23, 5000), new Employee("Pearl", 33, 4000), new Employee("Steve", 26, 6000) };
+        employeesSortedByAge = new Employee[] { new Employee("John", 23, 5000), new Employee("Jessica", 23, 4000), new Employee("Steve", 26, 6000), new Employee("Frank", 33, 70000), new Employee("Pearl", 33, 4000), new Employee("Earl", 43, 10000) };
+
+        HashMap<Integer, String> map = new HashMap<>();
+        map.put(55, "John");
+        map.put(22, "Apple");
+        map.put(66, "Earl");
+        map.put(77, "Pearl");
+        map.put(12, "George");
+        map.put(6, "Rocky");
+
+    }
+
+    @Test
+    public void givenIntArray_whenUsingSort_thenSortedArray() {
+        Arrays.sort(toSort);
+
+        assertTrue(Arrays.equals(toSort, sortedInts));
+    }
+
+    @Test
+    public void givenIntegerArray_whenUsingSort_thenSortedArray() {
+        Integer[] integers = ArrayUtils.toObject(toSort);
+        Arrays.sort(integers, new Comparator<Integer>() {
+            @Override
+            public int compare(Integer a, Integer b) {
+                return a - b;
+            }
+        });
+
+        assertTrue(Arrays.equals(integers, ArrayUtils.toObject(sortedInts)));
+    }
+
+    @Test
+    public void givenArray_whenUsingSortWithLambdas_thenSortedArray() {
+        Integer[] integersToSort = ArrayUtils.toObject(toSort);
+        Arrays.sort(integersToSort, (a, b) -> {
+            return a - b;
+        });
+
+        assertTrue(Arrays.equals(integersToSort, ArrayUtils.toObject(sortedInts)));
+    }
+
+    @Test
+    public void givenEmpArray_SortEmpArray_thenSortedArrayinNaturalOrder() {
+        Arrays.sort(employees);
+
+        assertTrue(Arrays.equals(employees, employeesSorted));
+    }
+
+    @Test
+    public void givenIntArray_whenUsingRangeSort_thenRangeSortedArray() {
+        Arrays.sort(toSort, 3, 7);
+
+        assertTrue(Arrays.equals(toSort, sortedRangeInts));
+    }
+
+    @Test
+    public void givenIntArray_whenUsingParallelSort_thenArraySorted() {
+        Arrays.parallelSort(toSort);
+
+        assertTrue(Arrays.equals(toSort, sortedInts));
+    }
+
+    @Test
+    public void givenArrayObjects_whenUsingComparing_thenSortedArrayObjects() {
+        List<Employee> employeesList = Arrays.asList(employees);
+
+        employeesList.sort(Comparator.comparing(Employee::getAge));// .thenComparing(Employee::getName));
+
+        assertTrue(Arrays.equals(employeesList.toArray(), employeesSortedByAge));
+    }
+
+    @Test
+    public void givenList_whenUsingSort_thenSortedList() {
+        List<Integer> toSortList = Ints.asList(toSort);
+        Collections.sort(toSortList);
+
+        assertTrue(Arrays.equals(toSortList.toArray(), ArrayUtils.toObject(sortedInts)));
+    }
+
+    @Test
+    public void givenMap_whenSortingByKeys_thenSortedMap() {
+        Integer[] sortedKeys = new Integer[] { 6, 12, 22, 55, 66, 77 };
+
+        List<Map.Entry<Integer, String>> entries = new ArrayList<>(map.entrySet());
+        Collections.sort(entries, new Comparator<Entry<Integer, String>>() {
+            @Override
+            public int compare(Entry<Integer, String> o1, Entry<Integer, String> o2) {
+                return o1.getKey().compareTo(o2.getKey());
+            }
+        });
+        HashMap<Integer, String> sortedMap = new LinkedHashMap<>();
+        for (Map.Entry<Integer, String> entry : entries) {
+            sortedMap.put(entry.getKey(), entry.getValue());
+        }
+
+        assertTrue(Arrays.equals(sortedMap.keySet().toArray(), sortedKeys));
+    }
+
+    @Test
+    public void givenMap_whenSortingByValues_thenSortedMap() {
+        String[] sortedValues = new String[] { "Apple", "Earl", "George", "John", "Pearl", "Rocky" };
+
+        List<Map.Entry<Integer, String>> entries = new ArrayList<>(map.entrySet());
+        Collections.sort(entries, new Comparator<Entry<Integer, String>>() {
+            @Override
+            public int compare(Entry<Integer, String> o1, Entry<Integer, String> o2) {
+                return o1.getValue().compareTo(o2.getValue());
+            }
+        });
+        HashMap<Integer, String> sortedMap = new LinkedHashMap<>();
+        for (Map.Entry<Integer, String> entry : entries) {
+            sortedMap.put(entry.getKey(), entry.getValue());
+        }
+
+        assertTrue(Arrays.equals(sortedMap.values().toArray(), sortedValues));
+    }
+
+    @Test
+    public void givenSet_whenUsingSort_thenSortedSet() {
+        HashSet<Integer> integersSet = new LinkedHashSet<>(Ints.asList(toSort));
+        HashSet<Integer> descSortedIntegersSet = new LinkedHashSet<>(Arrays.asList(new Integer[] { 255, 200, 123, 89, 88, 66, 7, 5, 1 }));
+
+        ArrayList<Integer> list = new ArrayList<Integer>(integersSet);
+        Collections.sort(list, (i1, i2) -> {
+            return i2 - i1;
+        });
+        integersSet = new LinkedHashSet<>(list);
+
+        assertTrue(Arrays.equals(integersSet.toArray(), descSortedIntegersSet.toArray()));
+    }
+
+}

core-java/src/test/resources/file.txt

@@ -0,0 +1 @@
+baeldung.com

ejb/ejb-client/pom.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>com.baeldung.ejb</groupId>
+		<artifactId>ejb</artifactId>
+		<version>1.0-SNAPSHOT</version>
+	</parent>
+	<artifactId>ejb-client</artifactId>
+	<name>EJB3 Client Maven</name>
+	<description>EJB3 Client Maven</description>
+    <dependencies>
+        <dependency>
+            <groupId>org.wildfly</groupId>
+            <artifactId>wildfly-ejb-client-bom</artifactId>
+            <type>pom</type>
+            <scope>import</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.baeldung.ejb</groupId>
+            <artifactId>ejb-remote</artifactId>
+            <type>ejb</type>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+                <configuration>
+                    <excludes>
+                        <exclude>**/*EJBSetupTest.java</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

ejb/ejb-client/src/main/java/com/baeldung/ejb/client/EJBClient.java

@@ -0,0 +1,71 @@
+package com.baeldung.ejb.client;
+
+import java.util.Properties;
+
+import javax.naming.Context;
+import javax.naming.InitialContext;
+import javax.naming.NamingException;
+
+import com.baeldung.ejb.tutorial.HelloWorld;
+
+public class EJBClient {
+
+    public EJBClient() {
+    }
+
+    private Context context = null;
+
+    public String getEJBRemoteMessage() {
+        EJBClient main = new EJBClient();
+        try {
+            // 1. Obtaining Context
+            main.createInitialContext();
+            // 2. Generate JNDI Lookup name and caste
+            HelloWorld helloWorld = main.lookup();
+            return helloWorld.getHelloWorld();
+        } catch (NamingException e) {
+            e.printStackTrace();
+            return "";
+        } finally {
+            try {
+                main.closeContext();
+            } catch (NamingException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    public HelloWorld lookup() throws NamingException {
+
+        // The app name is the EAR name of the deployed EJB without .ear suffix.
+        // Since we haven't deployed the application as a .ear, the app name for
+        // us will be an empty string
+        final String appName = "";
+        final String moduleName = "remote";
+        final String distinctName = "";
+        final String beanName = "HelloWorld";
+        final String viewClassName = HelloWorld.class.getName();
+        final String toLookup = "ejb:" + appName + "/" + moduleName 
+                + "/" + distinctName + "/" + beanName + "!" + viewClassName;
+        return (HelloWorld) context.lookup(toLookup);
+    }
+
+    public void createInitialContext() throws NamingException {
+        Properties prop = new Properties();
+        prop.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
+        prop.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
+        prop.put(Context.PROVIDER_URL, "http-remoting://127.0.0.1:8080");
+        prop.put(Context.SECURITY_PRINCIPAL, "testUser");
+        prop.put(Context.SECURITY_CREDENTIALS, "admin1234!");
+        prop.put("jboss.naming.client.ejb.context", false);
+
+        context = new InitialContext(prop);
+    }
+
+    public void closeContext() throws NamingException {
+        if (context != null) {
+            context.close();
+        }
+    }
+
+}

ejb/ejb-client/src/main/resources/jboss-ejb-client.properties

@@ -0,0 +1,8 @@
+remote.connections=default
+remote.connection.default.host=127.0.0.1
+remote.connection.default.port=8080
+remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false
+remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOPLAINTEXT=false
+remote.connection.default.connect.options.org.xnio.Options.SASL_DISALLOWED_MECHANISMS=${host.auth:JBOSS-LOCAL-USER}
+remote.connection.default.username=testUser
+remote.connection.default.password=admin1234!

ejb/ejb-client/src/test/java/com/baeldung/ejb/setup/test/EJBSetupTest.java

@@ -0,0 +1,16 @@
+package com.baeldung.ejb.setup.test;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+import com.baeldung.ejb.client.EJBClient;
+import com.baeldung.ejb.tutorial.HelloWorldBean;
+
+public class EJBSetupTest {
+
+    @Test
+    public void testEJBClient() {
+        EJBClient ejbClient = new EJBClient();
+        HelloWorldBean bean = new HelloWorldBean();
+        assertEquals(bean.getHelloWorld(), ejbClient.getEJBRemoteMessage());
+    }
+}

ejb/ejb-remote/pom.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>com.baeldung.ejb</groupId>
+		<artifactId>ejb</artifactId>
+		<version>1.0-SNAPSHOT</version>
+	</parent>
+	<artifactId>ejb-remote</artifactId>
+	<packaging>ejb</packaging>
+
+	<!-- <name>ejb-remote</name> -->
+	<dependencies>
+		 <dependency>
+        <groupId>javax</groupId>
+        <artifactId>javaee-api</artifactId>
+        <version>7.0</version>
+        <scope>provided</scope>
+    </dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.wildfly.plugins</groupId>
+				<artifactId>wildfly-maven-plugin</artifactId>
+				<version>1.1.0.Alpha5</version>
+				<configuration>
+					<hostname>127.0.0.1</hostname>
+					<port>9990</port>
+					<username>testUser</username>
+					<password>admin1234!</password>
+					<filename>${build.finalName}.jar</filename>
+				</configuration>
+			</plugin>
+		</plugins>
+		<!-- <finalName>ejb-remote</finalName> -->
+	</build>
+</project>

ejb/ejb-remote/src/main/java/com/baeldung/ejb/tutorial/HelloWorld.java

@@ -0,0 +1,8 @@
+package com.baeldung.ejb.tutorial;
+
+import javax.ejb.Remote;
+
+@Remote
+public interface HelloWorld {
+    String getHelloWorld();
+}

ejb/ejb-remote/src/main/java/com/baeldung/ejb/tutorial/HelloWorldBean.java

@@ -0,0 +1,19 @@
+package com.baeldung.ejb.tutorial;
+
+import javax.annotation.Resource;
+import javax.ejb.SessionContext;
+import javax.ejb.Stateless;
+
+@Stateless(name = "HelloWorld")
+public class HelloWorldBean implements HelloWorld {
+
+    @Resource
+    private SessionContext context;
+
+    @Override
+    public String getHelloWorld() {
+        return "Welcome to EJB Tutorial!";
+    }
+
+    
+}

ejb/ejb-remote/src/main/resources/META-INF/ejb-jar.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ejb-jar xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/ejb-jar_3_2.xsd"
+	version="3.2">
+	<module-name>remote</module-name>
+</ejb-jar>
+

ejb/pom.xml

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung.ejb</groupId>
+	<artifactId>ejb</artifactId>
+	<version>1.0-SNAPSHOT</version>
+	<packaging>pom</packaging>
+	<name>ejb</name>
+	<description>EJB Tutorial</description>
+
+	<repositories>
+		<repository>
+			<id>jboss-public-repository-group</id>
+			<name>JBoss Public Maven Repository Group</name>
+			<url>http://repository.jboss.org/nexus/content/groups/public/</url>
+			<layout>default</layout>
+			<releases>
+				<enabled>true</enabled>
+				<updatePolicy>never</updatePolicy>
+			</releases>
+			<snapshots>
+				<enabled>true</enabled>
+				<updatePolicy>never</updatePolicy>
+			</snapshots>
+		</repository>
+	</repositories>
+
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>com.baeldung.ejb</groupId>
+				<artifactId>ejb-remote</artifactId>
+				<version>1.0-SNAPSHOT</version>
+				<type>ejb</type>
+			</dependency>
+
+			<dependency>
+				<groupId>javax</groupId>
+				<artifactId>javaee-api</artifactId>
+				<version>7.0</version>
+				<scope>provided</scope>
+			</dependency>
+
+			<dependency>
+				<groupId>org.wildfly</groupId>
+				<artifactId>wildfly-ejb-client-bom</artifactId>
+				<version>10.1.0.Final</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
+	<build>
+		<pluginManagement>
+			<plugins>
+				<plugin>
+					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.1</version>
+					<configuration>
+						<source>1.8</source>
+						<target>1.8</target>
+					</configuration>
+				</plugin>
+
+				<plugin>
+					<artifactId>maven-ejb-plugin</artifactId>
+					<version>2.4</version>
+					<configuration>
+						<ejbVersion>3.2</ejbVersion>
+					</configuration>
+				</plugin>
+			</plugins>
+		</pluginManagement>
+	</build>
+
+	<modules>
+		<module>ejb-remote</module>
+		<module>ejb-client</module>
+	</modules>
+</project>

jackson-annotations/pom.xml

@@ -0,0 +1,235 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.baeldung</groupId>
+    <artifactId>jackson-annotations</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>jackson-annotations</name>
+
+    <dependencies>
+
+        <!-- utils -->
+
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
+
+        <!--jackson for xml-->
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+
+        <!-- marshalling -->
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-joda</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.module</groupId>
+            <artifactId>jackson-module-jsonSchema</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>joda-time</groupId>
+            <artifactId>joda-time</artifactId>
+            <version>${joda-time.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>${gson.version}</version>
+        </dependency>
+
+        <!-- test scoped -->
+
+        <dependency>
+            <groupId>io.rest-assured</groupId>
+            <artifactId>rest-assured</artifactId>
+            <version>3.0.1</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>io.rest-assured</groupId>
+            <artifactId>json-schema-validator</artifactId>
+            <version>3.0.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>io.rest-assured</groupId>
+            <artifactId>json-path</artifactId>
+            <version>3.0.1</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.github.fge</groupId>
+            <artifactId>json-schema-validator</artifactId>
+            <version>2.2.6</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.6.1</version>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- logging -->
+
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>jcl-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+
+        <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
+            <groupId>org.slf4j</groupId>
+            <artifactId>log4j-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <finalName>jackson</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven-compiler-plugin.source}</source>
+                    <target>${maven-compiler-plugin.source}</target>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+            </plugin>
+
+        </plugins>
+
+    </build>
+
+    <properties>
+
+        <!-- persistence -->
+        <hibernate.version>4.3.11.Final</hibernate.version>
+        <mysql-connector-java.version>5.1.38</mysql-connector-java.version>
+
+        <!-- marshalling -->
+        <jackson.version>2.8.5</jackson.version>
+
+        <!-- logging -->
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
+
+        <!-- various -->
+        <hibernate-validator.version>5.1.3.Final</hibernate-validator.version>
+        <joda-time.version>2.9.6</joda-time.version>
+        <gson.version>2.8.0</gson.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
+
+        <!-- util -->
+        <guava.version>20.0</guava.version>
+        <commons-lang3.version>3.5</commons-lang3.version>
+        <commons-io.version>2.5</commons-io.version>
+
+        <!-- testing -->
+        <org.hamcrest.version>1.3</org.hamcrest.version>
+        <junit.version>4.12</junit.version>
+        <mockito.version>2.2.26</mockito.version>
+
+        <httpcore.version>4.4.1</httpcore.version>
+        <httpclient.version>4.5</httpclient.version>
+
+        <rest-assured.version>2.9.0</rest-assured.version>
+
+        <!-- maven plugins -->
+        <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
+        <maven-war-plugin.version>2.6</maven-war-plugin.version>
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+        <maven-resources-plugin.version>2.7</maven-resources-plugin.version>
+        <cargo-maven2-plugin.version>1.4.18</cargo-maven2-plugin.version>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven-compiler-plugin.source>1.8</maven-compiler-plugin.source>
+
+    </properties>
+
+</project>

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jacksoninject/Author.java

@@ -0,0 +1,31 @@
+package com.baeldung.jacksonannotation.deserialization.jacksoninject;
+
+import com.baeldung.jacksonannotation.domain.Item;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    public Author(){}
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jacksoninject/Person.java

@@ -0,0 +1,49 @@
+package com.baeldung.jacksonannotation.deserialization.jacksoninject;
+
+import com.fasterxml.jackson.annotation.JacksonInject;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Person {
+
+    @JacksonInject
+    private UUID id;
+    private String firstName;
+    private String lastName;
+
+    public Person(){
+
+    }
+
+    public Person(String firstName, String lastName) {
+        this.id = UUID.randomUUID();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsonanysetter/Inventory.java

@@ -0,0 +1,38 @@
+package com.baeldung.jacksonannotation.deserialization.jsonanysetter;
+
+import com.baeldung.jacksonannotation.domain.Author;
+import com.baeldung.jacksonannotation.domain.Item;
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
+import com.fasterxml.jackson.annotation.JsonAnySetter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ * @see JsonAnyGetter
+ */
+public class Inventory {
+
+    private Map<Author, Item> stock = new HashMap<>();
+
+    private Map<String, Float> countryDeliveryCost = new HashMap<>();
+
+    @JsonIgnore
+    public Map<Author, Item> getStock() {
+        return stock;
+    }
+
+    public Map<String, Float> getCountryDeliveryCost() {
+        return countryDeliveryCost;
+    }
+
+    @JsonAnySetter
+    public void addCountryDeliveryCost(String country, Float cost) {
+        countryDeliveryCost.put(country, cost);
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsoncreator/Author.java

@@ -0,0 +1,38 @@
+package com.baeldung.jacksonannotation.deserialization.jsoncreator;
+
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonGetter;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ * @see JsonGetter
+ */
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    @JsonCreator
+    public Author(
+            @JsonProperty("christianName") String firstName,
+            @JsonProperty("surname") String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsondeserialize/Author.java

@@ -0,0 +1,30 @@
+package com.baeldung.jacksonannotation.deserialization.jsondeserialize;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsondeserialize/Book.java

@@ -0,0 +1,51 @@
+package com.baeldung.jacksonannotation.deserialization.jsondeserialize;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Book extends Item {
+
+    private String ISBN;
+
+    @JsonDeserialize(using = CustomDateDeserializer.class)
+    private Date published;
+    private BigDecimal pages;
+
+    public Book() {}
+
+    public Book(String title, Author author) {
+        super(title, author);
+    }
+
+    public String getISBN() {
+        return ISBN;
+    }
+
+    public void setISBN(String ISBN) {
+        this.ISBN = ISBN;
+    }
+
+    public Date getPublished() {
+        return published;
+    }
+
+    public void setPublished(Date published) {
+        this.published = published;
+    }
+
+    public BigDecimal getPages() {
+        return pages;
+    }
+
+    public void setPages(BigDecimal pages) {
+        this.pages = pages;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsondeserialize/CustomDateDeserializer.java

@@ -0,0 +1,42 @@
+package com.baeldung.jacksonannotation.deserialization.jsondeserialize;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class CustomDateDeserializer extends StdDeserializer<Date> {
+
+    private static SimpleDateFormat formatter =
+            new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
+
+    public CustomDateDeserializer() {
+        this(null);
+    }
+
+    public CustomDateDeserializer(Class<?> vc) {
+        super(vc);
+    }
+
+    @Override
+    public Date deserialize(JsonParser jsonparser, DeserializationContext context)
+            throws IOException, JsonProcessingException {
+        String date = jsonparser.getText();
+        try {
+            return formatter.parse(date);
+        } catch (ParseException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsondeserialize/Item.java

@@ -0,0 +1,61 @@
+package com.baeldung.jacksonannotation.deserialization.jsondeserialize;
+
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Item {
+
+    private UUID id;
+    private String title;
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/deserialization/jsonsetter/Author.java

@@ -0,0 +1,36 @@
+package com.baeldung.jacksonannotation.deserialization.jsonsetter;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonSetter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(){}
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    @JsonIgnore
+    public List<Item> getItems() {
+        return items;
+    }
+
+    @JsonSetter("publications")
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Author.java

@@ -0,0 +1,27 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Book.java

@@ -0,0 +1,48 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Book extends Item {
+
+    private String ISBN;
+    private Date published;
+    private BigDecimal pages;
+
+    public Book(){
+    }
+
+    public Book(String title, Author author) {
+        super(title, author);
+    }
+
+    public String getISBN() {
+        return ISBN;
+    }
+
+    public void setISBN(String ISBN) {
+        this.ISBN = ISBN;
+    }
+
+    public Date getPublished() {
+        return published;
+    }
+
+    public void setPublished(Date published) {
+        this.published = published;
+    }
+
+    public BigDecimal getPages() {
+        return pages;
+    }
+
+    public void setPages(BigDecimal pages) {
+        this.pages = pages;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Course.java

@@ -0,0 +1,71 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Course extends Item {
+
+    public enum Medium {CLASSROOM, ONLINE}
+
+    public enum Level {
+        BEGINNER("Beginner", 1), INTERMEDIATE("Intermediate", 2), ADVANCED("Advanced", 3);
+
+        private String name;
+        private int number;
+
+        Level(String name, int number) {
+            this.name = name;
+            this.number = number;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    private float duration;
+    private Medium medium;
+    private Level level;
+    private List<Course> prerequisite;
+
+    public Course(String title, Author author) {
+        super(title, author);
+    }
+
+    public float getDuration() {
+        return duration;
+    }
+
+    public void setDuration(float duration) {
+        this.duration = duration;
+    }
+
+    public Medium getMedium() {
+        return medium;
+    }
+
+    public void setMedium(Medium medium) {
+        this.medium = medium;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+
+    public List<Course> getPrerequisite() {
+        return prerequisite;
+    }
+
+    public void setPrerequisite(List<Course> prerequisite) {
+        this.prerequisite = prerequisite;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Customer.java

@@ -0,0 +1,24 @@
+package com.baeldung.jacksonannotation.domain;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Customer extends Person {
+
+    private String configuration;
+
+    public Customer(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public String getConfiguration() {
+        return configuration;
+    }
+
+    public void setConfiguration(String configuration) {
+        this.configuration = configuration;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Inventory.java

@@ -0,0 +1,29 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Inventory {
+
+    private Map<Author, Item> stock;
+
+    private Map<String, Float> countryDeliveryCost = new HashMap<>();
+
+    public Map<Author, Item> getStock() {
+        return stock;
+    }
+
+    public void setStock(Map<Author, Item> stock) {
+        this.stock = stock;
+    }
+
+    public Map<String, Float> getCountryDeliveryCost() {
+        return countryDeliveryCost;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Item.java

@@ -0,0 +1,59 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Item {
+
+    private UUID id;
+    private String title;
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Order.java

@@ -0,0 +1,50 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Order {
+
+    private UUID id;
+    private Type type;
+    private int internalAudit;
+
+    public static class Type {
+        public long id;
+        public String name;
+    }
+
+    public Order() {
+        this.id = UUID.randomUUID();
+    }
+
+    public Order(Type type) {
+        this();
+        this.type = type;
+    }
+
+    public Order(int internalAudit) {
+        this();
+        this.type = new Type();
+        this.type.id = 20;
+        this.type.name = "Order";
+        this.internalAudit = internalAudit;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/domain/Person.java

@@ -0,0 +1,44 @@
+package com.baeldung.jacksonannotation.domain;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Person {
+
+    private UUID id;
+    private String firstName;
+    private String lastName;
+
+    public Person(){}
+
+    public Person(String firstName, String lastName) {
+        this.id = UUID.randomUUID();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonfilter/Author.java

@@ -0,0 +1,32 @@
+package com.baeldung.jacksonannotation.general.jsonfilter;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonFilter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonFilter("authorFilter")
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonformat/Book.java

@@ -0,0 +1,56 @@
+package com.baeldung.jacksonannotation.general.jsonformat;
+
+import com.baeldung.jacksonannotation.domain.Author;
+import com.baeldung.jacksonannotation.domain.Item;
+import com.fasterxml.jackson.annotation.JsonFormat;
+
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Book extends Item {
+
+    private String ISBN;
+
+    @JsonFormat(
+            shape = JsonFormat.Shape.STRING,
+            pattern = "dd-MM-yyyy HH:mm:ss")
+    private Date published;
+    private BigDecimal pages;
+
+    public Book() {
+    }
+
+    public Book(String title, Author author) {
+        super(title, author);
+    }
+
+    public String getISBN() {
+        return ISBN;
+    }
+
+    public void setISBN(String ISBN) {
+        this.ISBN = ISBN;
+    }
+
+    public Date getPublished() {
+        return published;
+    }
+
+    public void setPublished(Date published) {
+        this.published = published;
+    }
+
+    public BigDecimal getPages() {
+        return pages;
+    }
+
+    public void setPages(BigDecimal pages) {
+        this.pages = pages;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonidentityinfo/Author.java

@@ -0,0 +1,33 @@
+package com.baeldung.jacksonannotation.general.jsonidentityinfo;
+
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonIdentityInfo(
+        generator = ObjectIdGenerators.PropertyGenerator.class,
+        property = "id")
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonidentityinfo/Course.java

@@ -0,0 +1,72 @@
+package com.baeldung.jacksonannotation.general.jsonidentityinfo;
+
+
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Course extends Item {
+
+    public enum Medium {CLASSROOM, ONLINE}
+
+    public enum Level {
+        BEGINNER("Beginner", 1), INTERMEDIATE("Intermediate", 2), ADVANCED("Advanced", 3);
+
+        private String name;
+        private int number;
+
+        Level(String name, int number) {
+            this.name = name;
+            this.number = number;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    private float duration;
+    private Medium medium;
+    private Level level;
+    private List<Course> prerequisite;
+
+    public Course(String title, Author author) {
+        super(title, author);
+    }
+
+    public float getDuration() {
+        return duration;
+    }
+
+    public void setDuration(float duration) {
+        this.duration = duration;
+    }
+
+    public Medium getMedium() {
+        return medium;
+    }
+
+    public void setMedium(Medium medium) {
+        this.medium = medium;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+
+    public List<Course> getPrerequisite() {
+        return prerequisite;
+    }
+
+    public void setPrerequisite(List<Course> prerequisite) {
+        this.prerequisite = prerequisite;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonidentityinfo/Item.java

@@ -0,0 +1,65 @@
+package com.baeldung.jacksonannotation.general.jsonidentityinfo;
+
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonIdentityInfo(
+        generator = ObjectIdGenerators.PropertyGenerator.class,
+        property = "id")
+public class Item {
+
+    private UUID id;
+    private String title;
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonidentityinfo/Person.java

@@ -0,0 +1,44 @@
+package com.baeldung.jacksonannotation.general.jsonidentityinfo;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Person {
+
+    private UUID id;
+    private String firstName;
+    private String lastName;
+
+    public Person(){}
+
+    public Person(String firstName, String lastName) {
+        this.id = UUID.randomUUID();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonproperty/Author.java

@@ -0,0 +1,29 @@
+package com.baeldung.jacksonannotation.general.jsonproperty;
+
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonproperty/Book.java

@@ -0,0 +1,61 @@
+package com.baeldung.jacksonannotation.general.jsonproperty;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Book extends Item {
+
+    private String ISBN;
+    private Date published;
+    private BigDecimal pages;
+    private String binding;
+
+    public Book() {
+    }
+
+    public Book(String title, Author author) {
+        super(title, author);
+    }
+
+    public String getISBN() {
+        return ISBN;
+    }
+
+    public void setISBN(String ISBN) {
+        this.ISBN = ISBN;
+    }
+
+    public Date getPublished() {
+        return published;
+    }
+
+    public void setPublished(Date published) {
+        this.published = published;
+    }
+
+    public BigDecimal getPages() {
+        return pages;
+    }
+
+    public void setPages(BigDecimal pages) {
+        this.pages = pages;
+    }
+
+    @JsonProperty("binding")
+    public String coverBinding() {
+        return binding;
+    }
+
+    @JsonProperty("binding")
+    public void configureBinding(String binding) {
+        this.binding = binding;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonproperty/Item.java

@@ -0,0 +1,61 @@
+package com.baeldung.jacksonannotation.general.jsonproperty;
+
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Item {
+
+    private UUID id;
+    private String title;
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonunwrapped/Order.java

@@ -0,0 +1,54 @@
+package com.baeldung.jacksonannotation.general.jsonunwrapped;
+
+import com.fasterxml.jackson.annotation.JsonUnwrapped;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Order {
+
+    private UUID id;
+
+    @JsonUnwrapped
+    private Type type;
+    private int internalAudit;
+
+    public static class Type {
+        public long id;
+        public String name;
+    }
+
+    public Order() {
+        this.id = UUID.randomUUID();
+    }
+
+    public Order(Type type) {
+        this();
+        this.type = type;
+    }
+
+    public Order(int internalAudit) {
+        this();
+        this.type = new Type();
+        this.type.id = 20;
+        this.type.name = "Order";
+        this.internalAudit = internalAudit;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonview/Order.java

@@ -0,0 +1,57 @@
+package com.baeldung.jacksonannotation.general.jsonview;
+
+import com.fasterxml.jackson.annotation.JsonView;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Order {
+
+    @JsonView(Views.Public.class)
+    private UUID id;
+
+    @JsonView(Views.Public.class)
+    private Type type;
+
+    @JsonView(Views.Internal.class)
+    private int internalAudit;
+
+    public static class Type {
+        public long id;
+        public String name;
+    }
+
+    public Order() {
+        this.id = UUID.randomUUID();
+    }
+
+    public Order(Type type) {
+        this();
+        this.type = type;
+    }
+
+    public Order(int internalAudit) {
+        this();
+        this.type = new Type();
+        this.type.id = 20;
+        this.type.name = "Order";
+        this.internalAudit = internalAudit;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/jsonview/Views.java

@@ -0,0 +1,15 @@
+package com.baeldung.jacksonannotation.general.jsonview;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Views {
+    public static class Public {
+    }
+
+    public static class Internal extends Public {
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/reference/Author.java

@@ -0,0 +1,30 @@
+package com.baeldung.jacksonannotation.general.reference;
+
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    @JsonManagedReference
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/reference/Course.java

@@ -0,0 +1,72 @@
+package com.baeldung.jacksonannotation.general.reference;
+
+
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Course extends Item {
+
+    public enum Medium {CLASSROOM, ONLINE}
+
+    public enum Level {
+        BEGINNER("Beginner", 1), INTERMEDIATE("Intermediate", 2), ADVANCED("Advanced", 3);
+
+        private String name;
+        private int number;
+
+        Level(String name, int number) {
+            this.name = name;
+            this.number = number;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    private float duration;
+    private Medium medium;
+    private Level level;
+    private List<Course> prerequisite;
+
+    public Course(String title, Author author) {
+        super(title, author);
+    }
+
+    public float getDuration() {
+        return duration;
+    }
+
+    public void setDuration(float duration) {
+        this.duration = duration;
+    }
+
+    public Medium getMedium() {
+        return medium;
+    }
+
+    public void setMedium(Medium medium) {
+        this.medium = medium;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+
+    public List<Course> getPrerequisite() {
+        return prerequisite;
+    }
+
+    public void setPrerequisite(List<Course> prerequisite) {
+        this.prerequisite = prerequisite;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/reference/Item.java

@@ -0,0 +1,63 @@
+package com.baeldung.jacksonannotation.general.reference;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Item {
+
+    private UUID id;
+    private String title;
+
+    @JsonBackReference
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/general/reference/Person.java

@@ -0,0 +1,44 @@
+package com.baeldung.jacksonannotation.general.reference;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Person {
+
+    private UUID id;
+    private String firstName;
+    private String lastName;
+
+    public Person(){}
+
+    public Person(String firstName, String lastName) {
+        this.id = UUID.randomUUID();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/inclusion/jsonautodetect/Order.java

@@ -0,0 +1,54 @@
+package com.baeldung.jacksonannotation.inclusion.jsonautodetect;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonAutoDetect(fieldVisibility = Visibility.ANY)
+public class Order {
+
+    private UUID id;
+    private Type type;
+    private int internalAudit;
+
+    public static class Type {
+        public long id;
+        public String name;
+    }
+
+    public Order() {
+        this.id = UUID.randomUUID();
+    }
+
+    public Order(Type type) {
+        this();
+        this.type = type;
+    }
+
+    public Order(int internalAudit) {
+        this();
+        this.type = new Type();
+        this.type.id = 20;
+        this.type.name = "Order";
+        this.internalAudit = internalAudit;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/inclusion/jsonignore/Author.java

@@ -0,0 +1,29 @@
+package com.baeldung.jacksonannotation.inclusion.jsonignore;
+
+import com.baeldung.jacksonannotation.domain.Item;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/inclusion/jsonignore/Person.java

@@ -0,0 +1,47 @@
+package com.baeldung.jacksonannotation.inclusion.jsonignore;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Person {
+
+    @JsonIgnore
+    private UUID id;
+    private String firstName;
+    private String lastName;
+
+    public Person(){}
+
+    public Person(String firstName, String lastName) {
+        this.id = UUID.randomUUID();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/inclusion/jsonignoreproperties/Course.java

@@ -0,0 +1,76 @@
+package com.baeldung.jacksonannotation.inclusion.jsonignoreproperties;
+
+import com.baeldung.jacksonannotation.domain.Author;
+import com.baeldung.jacksonannotation.domain.Item;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonIgnoreProperties({"medium"})
+public class Course extends Item {
+
+    public enum Medium {CLASSROOM, ONLINE}
+
+    public enum Level {
+        BEGINNER("Beginner", 1), INTERMEDIATE("Intermediate", 2), ADVANCED("Advanced", 3);
+
+        private String name;
+        private int number;
+
+        Level(String name, int number) {
+            this.name = name;
+            this.number = number;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    private float duration;
+    private Medium medium;
+    private Level level;
+    private List<Course> prerequisite;
+
+    public Course(String title, Author author) {
+        super(title, author);
+    }
+
+    public float getDuration() {
+        return duration;
+    }
+
+    public void setDuration(float duration) {
+        this.duration = duration;
+    }
+
+    public Medium getMedium() {
+        return medium;
+    }
+
+    public void setMedium(Medium medium) {
+        this.medium = medium;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+
+    public List<Course> getPrerequisite() {
+        return prerequisite;
+    }
+
+    public void setPrerequisite(List<Course> prerequisite) {
+        this.prerequisite = prerequisite;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/inclusion/jsonignoretype/Order.java

@@ -0,0 +1,44 @@
+package com.baeldung.jacksonannotation.inclusion.jsonignoretype;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreType;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Order {
+
+    private UUID id;
+    private Type type;
+
+    @JsonIgnoreType
+    public static class Type {
+        public long id;
+        public String name;
+    }
+
+    public Order() {
+        this.id = UUID.randomUUID();
+    }
+
+    public Order(Type type) {
+        this();
+        this.type = type;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/inclusion/jsoninclude/Author.java

@@ -0,0 +1,34 @@
+package com.baeldung.jacksonannotation.inclusion.jsoninclude;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonInclude(NON_NULL)
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/miscellaneous/custom/Course.java

@@ -0,0 +1,74 @@
+package com.baeldung.jacksonannotation.miscellaneous.custom;
+
+import com.baeldung.jacksonannotation.domain.Author;
+
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@CustomCourseAnnotation
+public class Course extends Item {
+
+    public enum Medium {CLASSROOM, ONLINE}
+
+    public enum Level {
+        BEGINNER("Beginner", 1), INTERMEDIATE("Intermediate", 2), ADVANCED("Advanced", 3);
+
+        private String name;
+        private int number;
+
+        Level(String name, int number) {
+            this.name = name;
+            this.number = number;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    private float duration;
+    private Medium medium;
+    private Level level;
+    private List<Course> prerequisite;
+
+    public Course(String title, Author author) {
+        super(title, author);
+    }
+
+    public float getDuration() {
+        return duration;
+    }
+
+    public void setDuration(float duration) {
+        this.duration = duration;
+    }
+
+    public Medium getMedium() {
+        return medium;
+    }
+
+    public void setMedium(Medium medium) {
+        this.medium = medium;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+
+    public List<Course> getPrerequisite() {
+        return prerequisite;
+    }
+
+    public void setPrerequisite(List<Course> prerequisite) {
+        this.prerequisite = prerequisite;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/miscellaneous/custom/CustomCourseAnnotation.java

@@ -0,0 +1,20 @@
+package com.baeldung.jacksonannotation.miscellaneous.custom;
+
+import com.fasterxml.jackson.annotation.*;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@JacksonAnnotationsInside
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({"title", "price", "id", "duration", "authors", "level"})
+@JsonIgnoreProperties({"prerequisite"})
+public @interface CustomCourseAnnotation {
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/miscellaneous/custom/Item.java

@@ -0,0 +1,62 @@
+package com.baeldung.jacksonannotation.miscellaneous.custom;
+
+import com.baeldung.jacksonannotation.domain.Author;
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Item {
+
+    private UUID id;
+    private String title;
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/miscellaneous/disable/Author.java

@@ -0,0 +1,36 @@
+package com.baeldung.jacksonannotation.miscellaneous.disable;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({"lastName", "items", "firstName", "id"})
+public class Author extends Person {
+
+    @JsonIgnore
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/miscellaneous/mixin/Author.java

@@ -0,0 +1,30 @@
+package com.baeldung.jacksonannotation.miscellaneous.mixin;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    private List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/miscellaneous/mixin/IgnoreListMixIn.java

@@ -0,0 +1,13 @@
+package com.baeldung.jacksonannotation.miscellaneous.mixin;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreType;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonIgnoreType
+public class IgnoreListMixIn {
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/polymorphism/Order.java

@@ -0,0 +1,66 @@
+package com.baeldung.jacksonannotation.polymorphism;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Order {
+
+    private UUID id;
+    private Type type;
+    private int internalAudit;
+
+    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME,
+            include = JsonTypeInfo.As.PROPERTY,
+            property = "ordertype")
+    @JsonSubTypes({
+            @JsonSubTypes.Type(value = InternalType.class, name = "internal")
+    })
+    public static class Type {
+        public long id;
+        public String name;
+    }
+
+    @JsonTypeName("internal")
+    public static class InternalType extends Type {
+        public long id;
+        public String name;
+    }
+
+    public Order() {
+        this.id = UUID.randomUUID();
+    }
+
+    public Order(Type type) {
+        this();
+        this.type = type;
+    }
+
+    public Order(int internalAudit) {
+        this();
+        this.type = new Type();
+        this.type.id = 20;
+        this.type.name = "Order";
+        this.internalAudit = internalAudit;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonanygetter/Inventory.java

@@ -0,0 +1,43 @@
+package com.baeldung.jacksonannotation.serialization.jsonanygetter;
+
+import com.baeldung.jacksonannotation.domain.Author;
+import com.baeldung.jacksonannotation.domain.Item;
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Inventory {
+
+    private String location;
+
+    private Map<Author, Item> stock = new HashMap<>();
+
+    private Map<String, Float> countryDeliveryCost = new HashMap<>();
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
+        this.location = location;
+    }
+
+    @JsonIgnore
+    public Map<Author, Item> getStock() {
+        return stock;
+    }
+
+    @JsonAnyGetter
+    public Map<String, Float> getCountryDeliveryCost() {
+        return countryDeliveryCost;
+    }
+
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsongetter/Author.java

@@ -0,0 +1,33 @@
+package com.baeldung.jacksonannotation.serialization.jsongetter;
+
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonGetter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    @JsonGetter("publications")
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonpropertyorder/Author.java

@@ -0,0 +1,32 @@
+package com.baeldung.jacksonannotation.serialization.jsonpropertyorder;
+
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonPropertyOrder({"items", "firstName", "lastName", "id"})
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonpropertyorder/Person.java

@@ -0,0 +1,42 @@
+package com.baeldung.jacksonannotation.serialization.jsonpropertyorder;
+
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Person {
+
+    private UUID id;
+    private String firstName;
+    private String lastName;
+
+    public Person(String firstName, String lastName) {
+        this.id = UUID.randomUUID();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonrawvalue/Customer.java

@@ -0,0 +1,28 @@
+package com.baeldung.jacksonannotation.serialization.jsonrawvalue;
+
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonRawValue;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Customer extends Person {
+
+    @JsonRawValue
+    private String configuration;
+
+    public Customer(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public String getConfiguration() {
+        return configuration;
+    }
+
+    public void setConfiguration(String configuration) {
+        this.configuration = configuration;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonrootname/Author.java

@@ -0,0 +1,32 @@
+package com.baeldung.jacksonannotation.serialization.jsonrootname;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+import com.fasterxml.jackson.annotation.JsonRootName;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+@JsonRootName("writer")
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonserialize/Author.java

@@ -0,0 +1,30 @@
+package com.baeldung.jacksonannotation.serialization.jsonserialize;
+
+import com.baeldung.jacksonannotation.domain.Item;
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Author extends Person {
+
+    List<Item> items = new ArrayList<>();
+
+    public Author(String firstName, String lastName) {
+        super(firstName, lastName);
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonserialize/Book.java

@@ -0,0 +1,51 @@
+package com.baeldung.jacksonannotation.serialization.jsonserialize;
+
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Book extends Item {
+
+    private String ISBN;
+
+    @JsonSerialize(using = CustomDateSerializer.class)
+    private Date published;
+    private BigDecimal pages;
+
+    public Book(){}
+
+    public Book(String title, Author author) {
+        super(title, author);
+    }
+
+    public String getISBN() {
+        return ISBN;
+    }
+
+    public void setISBN(String ISBN) {
+        this.ISBN = ISBN;
+    }
+
+    public Date getPublished() {
+        return published;
+    }
+
+    public void setPublished(Date published) {
+        this.published = published;
+    }
+
+    public BigDecimal getPages() {
+        return pages;
+    }
+
+    public void setPages(BigDecimal pages) {
+        this.pages = pages;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonserialize/CustomDateSerializer.java

@@ -0,0 +1,36 @@
+package com.baeldung.jacksonannotation.serialization.jsonserialize;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class CustomDateSerializer extends StdSerializer<Date> {
+
+    private static SimpleDateFormat formatter =
+            new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
+
+    public CustomDateSerializer() {
+        this(null);
+    }
+
+    public CustomDateSerializer(Class<Date> t) {
+        super(t);
+    }
+
+    @Override
+    public void serialize(Date value, JsonGenerator gen, SerializerProvider arg2)
+            throws IOException, JsonProcessingException {
+        gen.writeString(formatter.format(value));
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonserialize/Item.java

@@ -0,0 +1,61 @@
+package com.baeldung.jacksonannotation.serialization.jsonserialize;
+
+import com.baeldung.jacksonannotation.domain.Person;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Item {
+
+    private UUID id;
+    private String title;
+    private List<Person> authors = new ArrayList<>();
+    private float price;
+
+    public Item(){}
+
+    public Item(String title, Author author) {
+        this.id = UUID.randomUUID();
+        this.title = title;
+        this.authors.add(author);
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public void setId(UUID id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public List<Person> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<Person> authors) {
+        this.authors = authors;
+    }
+
+    public float getPrice() {
+        return price;
+    }
+
+    public void setPrice(float price) {
+        this.price = price;
+    }
+}

jackson-annotations/src/main/java/com/baeldung/jacksonannotation/serialization/jsonvalue/Course.java

@@ -0,0 +1,76 @@
+package com.baeldung.jacksonannotation.serialization.jsonvalue;
+
+import com.baeldung.jacksonannotation.domain.Author;
+import com.baeldung.jacksonannotation.domain.Item;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+import java.util.List;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class Course extends Item {
+
+    public enum Medium {CLASSROOM, ONLINE}
+
+    public enum Level {
+        BEGINNER("Beginner", 1), INTERMEDIATE("Intermediate", 2), ADVANCED("Advanced", 3);
+
+        private String name;
+        private int number;
+
+        Level(String name, int number) {
+            this.name = name;
+            this.number = number;
+        }
+
+        @JsonValue
+        public String getName() {
+            return name;
+        }
+    }
+
+    private float duration;
+    private Medium medium;
+    private Level level;
+    private List<Course> prerequisite;
+
+    public Course(String title, Author author) {
+        super(title, author);
+    }
+
+    public float getDuration() {
+        return duration;
+    }
+
+    public void setDuration(float duration) {
+        this.duration = duration;
+    }
+
+    public Medium getMedium() {
+        return medium;
+    }
+
+    public void setMedium(Medium medium) {
+        this.medium = medium;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+
+    public List<Course> getPrerequisite() {
+        return prerequisite;
+    }
+
+    public void setPrerequisite(List<Course> prerequisite) {
+        this.prerequisite = prerequisite;
+    }
+}

jackson-annotations/src/test/java/com/baeldung/jacksonannotation/deserialization/jacksoninject/JacksonInjectTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.jacksonannotation.deserialization.jacksoninject;
+
+import com.fasterxml.jackson.databind.InjectableValues;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Source code github.com/readlearncode
+ *
+ * @author Alex Theedom www.readlearncode.com
+ * @version 1.0
+ */
+public class JacksonInjectTest {
+
+    @Test
+    public void whenDeserializingUsingJacksonInject_thenCorrect() throws IOException {
+
+        UUID id = UUID.fromString("9616dc8c-bad3-11e6-a4a6-cec0c932ce01");
+
+        // arrange
+        String authorJson = "{\"firstName\": \"Alex\", \"lastName\": \"Theedom\"}";
+
+        // act
+        InjectableValues inject = new InjectableValues.Std().addValue(UUID.class, id);
+        Author author = new ObjectMapper().reader(inject).forType(Author.class).readValue(authorJson);
+
+        // assert
+        assertThat(author.getId()).isEqualTo(id);
+
+        /*
+            {
+              "firstName": "Alex",
+              "lastName": "Theedom",
+              "publications": []
+            }
+        */
+
+    }
+}