Merge pull request #46 from eugenp/master

update

algorithms-sorting-2/README.md

@@ -1,3 +1,7 @@
 ### Relevant Articles:
 
+- [Sorting a String Alphabetically in Java](https://www.baeldung.com/java-sort-string-alphabetically)
+- [Sorting Strings by Contained Numbers in Java](https://www.baeldung.com/java-sort-strings-contained-numbers)
+- [How an In-Place Sorting Algorithm Works](https://www.baeldung.com/java-in-place-sorting)
 - [Partitioning and Sorting Arrays with Many Repeated Entries](https://www.baeldung.com/java-sorting-arrays-with-repeated-entries)
+- More articles: [[<-- prev]](/algorithms-sorting)

algorithms-sorting-2/src/main/java/com/baeldung/algorithms/bynumber/NaturalOrderComparators.java

@@ -1,4 +1,4 @@
-package com.baeldung.algorithms.sort.bynumber;
+package com.baeldung.algorithms.bynumber;
 
 import java.util.Comparator;
 

algorithms-sorting-2/src/test/java/com/baeldung/algorithms/bynumber/NaturalOrderComparatorsUnitTest.java

@@ -1,6 +1,5 @@
-package com.baeldung.algorithms.sort.bynumber;
+package com.baeldung.algorithms.bynumber;
 
-import com.baeldung.algorithms.sort.bynumber.NaturalOrderComparators;
 import org.junit.Test;
 
 import java.util.ArrayList;

algorithms-sorting/README.md

@@ -11,10 +11,7 @@ This module contains articles about sorting algorithms.
 - [Heap Sort in Java](https://www.baeldung.com/java-heap-sort)
 - [Shell Sort in Java](https://www.baeldung.com/java-shell-sort)
 - [Counting Sort in Java](https://www.baeldung.com/java-counting-sort)
-- [Sorting Strings by Contained Numbers in Java](https://www.baeldung.com/java-sort-strings-contained-numbers)
-- [How an In-Place Sorting Algorithm Works](https://www.baeldung.com/java-in-place-sorting)
 - [Selection Sort in Java](https://www.baeldung.com/java-selection-sort)
-- [Sorting Strings by Contained Numbers in Java](https://www.baeldung.com/java-sort-strings-contained-numbers)
 - [Radix Sort in Java](https://www.baeldung.com/java-radix-sort)
-- [Sorting a String Alphabetically in Java](https://www.baeldung.com/java-sort-string-alphabetically)
 - [Bucket Sort in Java](https://www.baeldung.com/java-bucket-sort)
+- More articles: [[next -->]](/algorithms-sorintg-2)

cas/README.md

@@ -1,7 +1,18 @@
 ## CAS
 
-This module contains articles about the Central Authentication Service (CAS)
+This module contains articles about the Central Authentication Service (CAS).
+
+The module consists of 2 submodules:
+1. `cas-server` - it requires JDK11 and uses the Gradle War Overlay style to ease setup and deployment. To  start the server, simply run:
+
+`./gradlew run
+  -Dorg.gradle.java.home=$JAVA11_HOME
+  -Pargs="-Dcas.standalone.configurationDirectory=/cas-server/src/main/resources/etc/cas/config"`
+
+The server starts at https://localhost:8443. `casuser`/`Mellon` are the username and password for logging in.
+
+2. `cas-secured-app` - A Maven based Springboot Application
 
 ### Relevant Articles: 
 
-- [CAS SSO With Spring Security](baeldung.com/spring-security-cas-sso)
+- [CAS SSO With Spring Security](https://www.baeldung.com/spring-security-cas-sso)

core-java-modules/core-java-8-datetime-2/README.md

@@ -0,0 +1,5 @@
+### Relevant Articles:
+
+- [Generating Random Dates in Java](https://www.baeldung.com/java-random-dates)
+- [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)
+- [[<-- Prev]](/core-java-modules/core-java-datetime-java8-1)

core-java-modules/core-java-8-datetime-2/pom.xml

@@ -4,9 +4,9 @@
     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>
-    <artifactId>core-java-datetime-java8</artifactId>
+    <artifactId>core-java-8-datetime</artifactId>
     <version>${project.parent.version}</version>
-    <name>core-java-datetime-java8</name>
+    <name>core-java-8-datetime</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -64,8 +64,8 @@
     </build>
 
     <properties>
-        <maven.compiler.source>1.9</maven.compiler.source>
-        <maven.compiler.target>1.9</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <joda-time.version>2.10</joda-time.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>

core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/localdate/LocalDateExampleUnitTest.java

@@ -11,31 +11,31 @@ public class LocalDateExampleUnitTest {
 
     @Test
     public void givenValues_whenUsingOfMethod_thenLocalDate() {
-        assertEquals("2020-01-08", date.getCustomDateOne(2020, 1, 8));
+        assertEquals("2020-01-08", date.getCustomDateOne(2020, 1, 8).toString());
     }
 
     @Test
     public void givenValuesWithMonthEnum_whenUsingOfMethod_thenLocalDate() {
-        assertEquals("2020-01-08", date.getCustomDateTwo(2020, Month.JANUARY, 8));
+        assertEquals("2020-01-08", date.getCustomDateTwo(2020, Month.JANUARY, 8).toString());
     }
 
     @Test
     public void givenValues_whenUsingEpochDay_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromEpochDay(18269));
+        assertEquals("2020-01-08", date.getDateFromEpochDay(18269).toString());
     }
 
     @Test
     public void givenValues_whenUsingYearDay_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromYearAndDayOfYear(2020, 8));
+        assertEquals("2020-01-08", date.getDateFromYearAndDayOfYear(2020, 8).toString());
     }
 
     @Test
     public void givenValues_whenUsingParse_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromString("2020-01-08"));
+        assertEquals("2020-01-08", date.getDateFromString("2020-01-08").toString());
     }
 
     @Test
     public void givenValuesWithFormatter_whenUsingParse_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromStringAndFormatter("8-Jan-2020", "d-MMM-yyyy"));
+        assertEquals("2020-01-08", date.getDateFromStringAndFormatter("8-Jan-2020", "d-MMM-yyyy").toString());
     }
 }

core-java-modules/core-java-8-datetime/README.md

@@ -13,4 +13,4 @@ This module contains articles about the Date and Time API introduced with Java 8
 - [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
 - [Set the Time Zone of a Date in Java](https://www.baeldung.com/java-set-date-time-zone)
 - [Comparing Dates in Java](https://www.baeldung.com/java-comparing-dates)
-- [Generating Random Dates in Java](https://www.baeldung.com/java-random-dates)
+- [[Next -->]](/core-java-modules/core-java-datetime-java8-2)

core-java-modules/core-java-8-datetime/pom.xml

@@ -4,9 +4,9 @@
     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>
-    <artifactId>core-java-datetime-java8</artifactId>
+    <artifactId>core-java-8-datetime</artifactId>
     <version>${project.parent.version}</version>
-    <name>core-java-datetime-java8</name>
+    <name>core-java-8-datetime</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -64,8 +64,8 @@
     </build>
 
     <properties>
-        <maven.compiler.source>1.9</maven.compiler.source>
-        <maven.compiler.target>1.9</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <joda-time.version>2.10</joda-time.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>

core-java-modules/core-java-collections-maps-3/src/test/java/com/baeldung/map/computeifabsent/ComputeIfAbsentUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.map.computeifabsent;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+public class ComputeIfAbsentUnitTest {
+
+        @Test
+        public void whenKeyIsPresent_thenFetchTheValue() {
+                Map<String, Integer> stringLength = new HashMap<>();
+                stringLength.put("John", 5);
+                assertEquals((long)stringLength.computeIfAbsent("John", s -> s.length()), 5);
+        }
+
+        @Test
+        public void whenKeyIsNotPresent_thenComputeTheValueUsingMappingFunctionAndStore() {
+                Map<String, Integer> stringLength = new HashMap<>();
+                assertEquals((long)stringLength.computeIfAbsent("John", s -> s.length()), 4);
+                assertEquals((long)stringLength.get("John"), 4);
+        }
+
+        @Test
+        public void whenMappingFunctionReturnsNull_thenDoNotRecordMapping() {
+                Map<String, Integer> stringLength = new HashMap<>();
+                assertEquals(stringLength.computeIfAbsent("John", s -> null), null);
+                assertNull(stringLength.get("John"));
+        }
+
+        @Test(expected = RuntimeException.class)
+        public void whenMappingFunctionThrowsException_thenExceptionIsRethrown() {
+                Map<String, Integer> stringLength = new HashMap<>();
+                stringLength.computeIfAbsent("John", s -> {throw new RuntimeException();});
+        }
+}

core-java-modules/core-java-concurrency-advanced-3/src/main/java/com/baeldung/atomicstampedreference/StampedAccount.java

@@ -0,0 +1,34 @@
+package com.baeldung.atomicstampedreference;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicStampedReference;
+
+public class StampedAccount {
+
+    private AtomicInteger stamp = new AtomicInteger(0);
+    private AtomicStampedReference<Integer> account = new AtomicStampedReference<>(0, 0);
+
+    public int getBalance() {
+        return this.account.get(new int[1]);
+    }
+
+    public int getStamp() {
+        int[] stamps = new int[1];
+        this.account.get(stamps);
+        return stamps[0];
+    }
+
+    public boolean deposit(int funds) {
+        int[] stamps = new int[1];
+        int current = this.account.get(stamps);
+        int newStamp = this.stamp.incrementAndGet();
+        return this.account.compareAndSet(current, current + funds, stamps[0], newStamp);
+    }
+
+    public boolean withdrawal(int funds) {
+        int[] stamps = new int[1];
+        int current = this.account.get(stamps);
+        int newStamp = this.stamp.incrementAndGet();
+        return this.account.compareAndSet(current, current - funds, stamps[0], newStamp);
+    }
+}

core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/atomicstampedreference/ThreadStampedAccountUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.atomicstampedreference;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ThreadStampedAccountUnitTest {
+
+    @Test
+    public void givenMultiThread_whenStampedAccount_thenSetBalance() throws InterruptedException {
+        StampedAccount account = new StampedAccount();
+        Thread t = new Thread(() -> {
+            while (!account.withdrawal(100))
+                Thread.yield();
+        });
+        t.start();
+        Assert.assertTrue(account.deposit(100));
+        t.join(1_000);
+        Assert.assertFalse(t.isAlive());
+        Assert.assertSame(0, account.getBalance());
+    }
+}

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadsafety/application/Application.java

@@ -9,7 +9,7 @@ import com.baeldung.concurrent.threadsafety.callables.ReentranReadWriteLockCount
 import com.baeldung.concurrent.threadsafety.callables.ReentrantLockCounterCallable;
 import com.baeldung.concurrent.threadsafety.services.AtomicCounter;
 import com.baeldung.concurrent.threadsafety.services.Counter;
-import com.baeldung.concurrent.threadsafety.services.ExtrinsicLockCounter;
+import com.baeldung.concurrent.threadsafety.services.ObjectLockCounter;
 import com.baeldung.concurrent.threadsafety.services.MessageService;
 import com.baeldung.concurrent.threadsafety.services.ReentrantLockCounter;
 import com.baeldung.concurrent.threadsafety.services.ReentrantReadWriteLockCounter;
@@ -48,9 +48,9 @@ public class Application {
         System.out.println(future3.get());
         System.out.println(future4.get());
         
-        ExtrinsicLockCounter extrinsicLockCounter = new ExtrinsicLockCounter();
-        Future<Integer> future5 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(extrinsicLockCounter));
-        Future<Integer> future6 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(extrinsicLockCounter));
+        ObjectLockCounter objectLockCounter = new ObjectLockCounter();
+        Future<Integer> future5 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(objectLockCounter));
+        Future<Integer> future6 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(objectLockCounter));
         System.out.println(future5.get());
         System.out.println(future6.get());
         

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadsafety/callables/ExtrinsicLockCounterCallable.java

@@ -1,13 +1,13 @@
 package com.baeldung.concurrent.threadsafety.callables;
 
-import com.baeldung.concurrent.threadsafety.services.ExtrinsicLockCounter;
+import com.baeldung.concurrent.threadsafety.services.ObjectLockCounter;
 import java.util.concurrent.Callable;
 
 public class ExtrinsicLockCounterCallable implements Callable<Integer> {
 
-    private final ExtrinsicLockCounter counter;
+    private final ObjectLockCounter counter;
     
-    public ExtrinsicLockCounterCallable(ExtrinsicLockCounter counter) {
+    public ExtrinsicLockCounterCallable(ObjectLockCounter counter) {
         this.counter = counter;
     }
     

core-java-modules/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadsafety/services/ObjectLockCounter.java

@@ -1,11 +1,11 @@
 package com.baeldung.concurrent.threadsafety.services;
 
-public class ExtrinsicLockCounter {
+public class ObjectLockCounter {
 
     private int counter;
     private final Object lock = new Object();
 
-    public ExtrinsicLockCounter() {
+    public ObjectLockCounter() {
         this.counter = 0;
     }
 

core-java-modules/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/threadsafety/ObjectLockCounterUnitTest.java

@@ -1,7 +1,7 @@
 package com.baeldung.concurrent.threadsafety;
 
 import com.baeldung.concurrent.threadsafety.callables.ExtrinsicLockCounterCallable;
-import com.baeldung.concurrent.threadsafety.services.ExtrinsicLockCounter;
+import com.baeldung.concurrent.threadsafety.services.ObjectLockCounter;
 import org.junit.Test;
 
 import java.util.concurrent.ExecutorService;
@@ -10,12 +10,12 @@ import java.util.concurrent.Future;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-public class ExtrinsicLockCounterUnitTest {
+public class ObjectLockCounterUnitTest {
 
     @Test
     public void whenCalledIncrementCounter_thenCorrect() throws Exception {
         ExecutorService executorService = Executors.newFixedThreadPool(2);
-        ExtrinsicLockCounter counter = new ExtrinsicLockCounter();
+        ObjectLockCounter counter = new ObjectLockCounter();
         Future<Integer> future1 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(counter));
         Future<Integer> future2 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(counter));
 

core-java-modules/core-java-datetime-java8-2/README.md

@@ -1,3 +0,0 @@
-### Relevant Articles:
-
-- [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)

core-java-modules/core-java-io-conversions-2/README.md

@@ -0,0 +1,9 @@
+## Core Java IO Conversions (Part 2)
+
+This module contains articles about core Java input/output(IO) conversions. 
+
+### Relevant Articles:
+- [Java InputStream to String](https://www.baeldung.com/convert-input-stream-to-string)
+- [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)
+- [Java – Write an InputStream to a File](https://www.baeldung.com/convert-input-stream-to-a-file)
+- More articles: [[<-- prev]](/core-java-modules/core-java-io-conversions)

core-java-modules/core-java-io-conversions-2/pom.xml

@@ -0,0 +1,37 @@
+<?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>
+    <artifactId>core-java-io-conversions-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-io-conversions-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-io-conversions</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

core-java-modules/core-java-io-conversions-2/src/test/resources/targetFile.tmp

@@ -0,0 +1 @@
+Hello World

core-java-modules/core-java-io-conversions/README.md

@@ -3,10 +3,8 @@
 This module contains articles about core Java input/output(IO) conversions. 
 
 ### Relevant Articles:
-- [Java InputStream to String](https://www.baeldung.com/convert-input-stream-to-string)
 - [Java – Convert File to InputStream](https://www.baeldung.com/convert-file-to-input-stream)
 - [Java – Byte Array to Writer](https://www.baeldung.com/java-convert-byte-array-to-writer)
-- [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)
 - [Java – String to Reader](https://www.baeldung.com/java-convert-string-to-reader)
 - [Java – Byte Array to Reader](https://www.baeldung.com/java-convert-byte-array-to-reader)
 - [Java – File to Reader](https://www.baeldung.com/java-convert-file-to-reader)
@@ -15,3 +13,4 @@ This module contains articles about core Java input/output(IO) conversions.
 - [Java – Write a Reader to File](https://www.baeldung.com/java-write-reader-to-file)
 - [Java – Reader to Byte Array](https://www.baeldung.com/java-convert-reader-to-byte-array)
 - [Java – Reader to InputStream](https://www.baeldung.com/java-convert-reader-to-inputstream)
+- More articles: [[next -->]](/core-java-modules/core-java-io-conversions-2)

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/connectexception/ConnectionChecker.java

@@ -0,0 +1,24 @@
+package com.baeldung.connectexception;
+
+import java.net.ConnectException;
+import java.net.Socket;
+
+public class ConnectionChecker {
+    public static void main(String[] args) {
+        String host = "localhost";
+        int port = 5000;
+
+        try {
+            Socket clientSocket = new Socket(host, port);
+
+            // successfully connected to host, do something with opened socket
+
+            clientSocket.close();
+        } catch (ConnectException e) {
+            // host and port combination not valid
+            e.printStackTrace();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

core-java-modules/core-java-optional/src/test/java/com/baeldung/optional/OptionalUnitTest.java

@@ -87,6 +87,15 @@ public class OptionalUnitTest {
         String name = opt.get();
     }
     
+    @Test
+    public void givenAnEmptyOptional_thenIsEmptyBehavesAsExpected() {
+        Optional<String> opt = Optional.of("Baeldung");
+        assertTrue(opt.isPresent());
+     
+        opt = Optional.ofNullable(null);
+        assertFalse(opt.isPresent());
+    }
+
     // Conditional Return With filter()
     @Test
     public void whenOptionalFilterWorks_thenCorrect() {

core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/closure/StreamClosureSnippets.java

@@ -0,0 +1,30 @@
+package com.baeldung.streams.closure;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.stream.Stream;
+
+/**
+ * Contains a couple of simple stream API usages.
+ */
+public class StreamClosureSnippets {
+
+    public static void main(String[] args) throws IOException {
+        // Collection based streams shouldn't be closed
+        Arrays.asList("Red", "Blue", "Green")
+          .stream()
+          .filter(c -> c.length() > 4)
+          .map(String::toUpperCase)
+          .forEach(System.out::print);
+
+        String[] colors = {"Red", "Blue", "Green"};
+        Arrays.stream(colors).map(String::toUpperCase).forEach(System.out::println);
+
+        // IO-Based Streams Should be Closed via Try with Resources
+        try (Stream<String> lines = Files.lines(Paths.get("/path/tp/file"))) {
+            // lines will be closed after exiting the try block
+        }
+    }
+}

core-java-modules/pom.xml

@@ -69,6 +69,7 @@
         <module>core-java-io-2</module>
         <module>core-java-io-apis</module>
         <module>core-java-io-conversions</module>
+        <module>core-java-io-conversions-2</module>
 
         <module>core-java-jar</module>
         <module>core-java-jndi</module>

ddd-modules/pom.xml

@@ -5,7 +5,7 @@
     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.dddmodules</groupId>
-    <artifactId>dddmodules</artifactId>
+    <artifactId>ddd-modules</artifactId>
     <version>1.0</version>
     <name>ddd-modules</name>
     <packaging>pom</packaging>

jackson-modules/jackson-conversions/src/test/java/com/baeldung/jackson/date/JacksonDateUnitTest.java

@@ -1,6 +1,7 @@
 package com.baeldung.jackson.date;
 
 import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.CoreMatchers.*;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThat;
 
@@ -8,6 +9,8 @@ import java.io.IOException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
 import java.util.Date;
 import java.util.TimeZone;
 
@@ -30,7 +33,7 @@ import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 public class JacksonDateUnitTest {
 
     @Test
-    public void whenSerializingDateWithJackson_thenSerializedToNumber() throws JsonProcessingException, ParseException {
+    public void whenSerializingDateWithJackson_thenSerializedToTimestamp() throws JsonProcessingException, ParseException {
         final SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm");
         df.setTimeZone(TimeZone.getTimeZone("UTC"));
 
@@ -62,6 +65,21 @@ public class JacksonDateUnitTest {
         assertThat(result, containsString("1970-01-01T02:30:00.000+00:00"));
     }
     
+    @Test
+    public void whenDeserialisingZonedDateTimeWithDefaults_thenNotCorrect()
+      throws IOException {
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.findAndRegisterModules();
+        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+        ZonedDateTime now = ZonedDateTime.now(ZoneId.of("UTC"));
+        String converted = objectMapper.writeValueAsString(now);
+     
+        ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class);
+        System.out.println("serialized: " + now);
+        System.out.println("restored: " + restored);
+        assertThat(now, is(restored));
+    }
+
     @Test
     public void whenSettingObjectMapperDateFormat_thenCorrect() throws JsonProcessingException, ParseException {
         final SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm");

jgit/pom.xml

@@ -2,9 +2,9 @@
 <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>
-    <artifactId>JGit</artifactId>
+    <artifactId>jgit</artifactId>
     <version>1.0-SNAPSHOT</version>
-    <name>JGit</name>
+    <name>jgit</name>
     <packaging>jar</packaging>
     <url>http://maven.apache.org</url>
 

jws/pom.xml

@@ -14,21 +14,6 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <repositories>
-        <repository>
-            <id>OpenNMS Repository</id>
-            <url>https://repo.opennms.org/maven2/</url>
-        </repository>
-    </repositories>
-
-    <dependencies>
-        <dependency>
-            <groupId>javax.samples.jnlp</groupId>
-            <artifactId>jnlp-servlet</artifactId>
-            <version>${jnlp-servlet.version}</version>
-        </dependency>
-    </dependencies>
-
     <build>
         <finalName>${project.artifactId}</finalName>
         <plugins>
@@ -79,7 +64,6 @@
 
     <properties>
         <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
-        <jnlp-servlet.version>1.6.0</jnlp-servlet.version>
     </properties>
 
 </project>

libraries-2/README.md

@@ -14,11 +14,9 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Guide to Java Parallel Collectors Library](https://www.baeldung.com/java-parallel-collectors)
 - [Templating with Handlebars](https://www.baeldung.com/handlebars)
 - [A Guide to Crawler4j](https://www.baeldung.com/crawler4j)
-- [Decode an OkHttp JSON Response](https://www.baeldung.com/okhttp-json-response)
 - [Key Value Store with Chronicle Map](https://www.baeldung.com/java-chronicle-map)
 - [Guide to MapDB](https://www.baeldung.com/mapdb)
 - [A Guide to Apache Mesos](https://www.baeldung.com/apache-mesos)
 - [JasperReports with Spring](https://www.baeldung.com/spring-jasper)
-- [Jetty ReactiveStreams HTTP Client](https://www.baeldung.com/jetty-reactivestreams-http-client)
 - More articles [[<-- prev]](/libraries)
 

libraries-2/pom.xml

@@ -75,28 +75,7 @@
                 </exclusion>
             </exclusions>
         </dependency>
-        <!-- Dependencies for response decoder with okhttp -->
-        <dependency>
-            <groupId>com.squareup.okhttp3</groupId>
-            <artifactId>okhttp</artifactId>
-            <version>${okhttp.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-            <version>${jackson.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.google.code.gson</groupId>
-            <artifactId>gson</artifactId>
-            <version>${gson.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.squareup.okhttp3</groupId>
-            <artifactId>mockwebserver</artifactId>
-            <version>${mockwebserver.version}</version>
-            <scope>test</scope>
-        </dependency>
+       
         <dependency>
             <groupId>edu.uci.ics</groupId>
             <artifactId>crawler4j</artifactId>
@@ -151,9 +130,6 @@
         <spring-boot-starter.version>2.1.4.RELEASE</spring-boot-starter.version>
         <mesos.library.version>0.28.3</mesos.library.version>
         <parallel-collectors.version>1.1.0</parallel-collectors.version>
-        <okhttp.version>3.14.2</okhttp.version>
-        <gson.version>2.8.5</gson.version>
-        <mockwebserver.version>3.14.2</mockwebserver.version>
         <handlebars.version>4.1.2</handlebars.version>
         <jasperreports.version>6.6.0</jasperreports.version>
         <spring.version>5.1.9.RELEASE</spring.version>

libraries-http-2/README.md

@@ -0,0 +1,10 @@
+## HTTP
+
+This module contains articles about HTTP libraries.
+
+### Relevant Articles: 
+
+- [Jetty ReactiveStreams HTTP Client](https://www.baeldung.com/jetty-reactivestreams-http-client)
+- [Decode an OkHttp JSON Response](https://www.baeldung.com/okhttp-json-response)
+- More articles [[<-- prev]](/libraries-http)
+

libraries-http-2/pom.xml

@@ -0,0 +1,47 @@
+<?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>
+    <artifactId>libraries-http-2</artifactId>
+    <name>libraries-http-2</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+         <!-- Dependencies for response decoder with okhttp -->
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>${okhttp.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>${gson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>mockwebserver</artifactId>
+            <version>${mockwebserver.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <okhttp.version>3.14.2</okhttp.version>
+        <gson.version>2.8.5</gson.version>
+        <mockwebserver.version>3.14.2</mockwebserver.version>
+        <jackson.version>2.9.8</jackson.version>
+    </properties>
+
+</project>

libraries-http/README.md

@@ -14,3 +14,4 @@ This module contains articles about HTTP libraries.
 - [Creating REST Microservices with Javalin](https://www.baeldung.com/javalin-rest-microservices)
 - [A Quick Guide to Timeouts in OkHttp](https://www.baeldung.com/okhttp-timeouts)
 - [A Quick Guide to Post Requests with OkHttp](https://www.baeldung.com/okhttp-post)
+- More articles [[next -->]](/libraries-http-2)

libraries-server/README.md

@@ -13,3 +13,4 @@ This module contains articles about server libraries.
 - [MQTT Client in Java](https://www.baeldung.com/java-mqtt-client)
 - [Guide to XMPP Smack Client](https://www.baeldung.com/xmpp-smack-chat-client)
 - [A Guide to NanoHTTPD](https://www.baeldung.com/nanohttpd)
+- [HTTP/2 in Jetty](https://www.baeldung.com/jetty-http-2)

libraries-server/pom.xml

@@ -5,6 +5,7 @@
     <artifactId>libraries-server</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>libraries-server</name>
+    <packaging>war</packaging>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -106,11 +107,50 @@
 
     </dependencies>
     
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.eclipse.jetty</groupId>
+                <artifactId>jetty-maven-plugin</artifactId>
+                <version>${jetty.version}</version>
+                <configuration>
+                    <stopPort>8888</stopPort>
+                    <stopKey>quit</stopKey>
+                    <jvmArgs>
+                        -Xbootclasspath/p:${settings.localRepository}/org/mortbay/jetty/alpn/alpn-boot/${alpn.version}/alpn-boot-${alpn.version}.jar
+                    </jvmArgs>
+                    <jettyXml>${basedir}/src/main/config/jetty.xml</jettyXml>
+                    <webApp>
+                        <contextPath>/</contextPath>
+                    </webApp>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.eclipse.jetty.http2</groupId>
+                        <artifactId>http2-server</artifactId>
+                        <version>${jetty.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>org.eclipse.jetty</groupId>
+                        <artifactId>jetty-alpn-openjdk8-server</artifactId>
+                        <version>${jetty.version}</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>org.eclipse.jetty</groupId>
+                        <artifactId>jetty-servlets</artifactId>
+                        <version>${jetty.version}</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+        </plugins>
+    </build>
+
     <properties>
         <assertj.version>3.6.2</assertj.version>
         <httpclient.version>4.5.3</httpclient.version>
-        <jetty.version>9.4.8.v20171121</jetty.version>
+        <jetty.version>9.4.27.v20200227</jetty.version>
         <netty.version>4.1.20.Final</netty.version>
+        <alpn.version>8.1.11.v20170118</alpn.version>
         <tomcat.version>8.5.24</tomcat.version>
         <smack.version>4.3.1</smack.version>
         <eclipse.paho.client.mqttv3.version>1.2.0</eclipse.paho.client.mqttv3.version>

libraries-server/src/main/config/jetty.xml

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd">
+
+<Configure id="Server" class="org.eclipse.jetty.server.Server">
+
+    <New id="sslContextFactory" class="org.eclipse.jetty.util.ssl.SslContextFactory">
+        <Set name="keyStorePath">src/main/resources/keystore.jks</Set>
+        <Set name="keyStorePassword">storepwd</Set>
+        <Set name="trustStorePath">src/main/resources/truststore.jks</Set>
+        <Set name="trustStorePassword">storepwd</Set>
+        <Set name="protocol">TLSv1.2</Set>
+    </New>
+    <New id="httpConfig" class="org.eclipse.jetty.server.HttpConfiguration"/>
+
+    <Call name="addConnector">
+        <Arg>
+            <New class="org.eclipse.jetty.server.ServerConnector">
+                <Arg name="server">
+                    <Ref id="Server"/>
+                </Arg>
+                <Arg name="factories">
+                    <Array type="org.eclipse.jetty.server.ConnectionFactory">
+                        <Item>
+                            <New class="org.eclipse.jetty.server.SslConnectionFactory">
+                                <Arg name="sslContextFactory">
+                                    <Ref id="sslContextFactory"/>
+                                </Arg>
+                                <Arg name="next">http/1.1</Arg>
+                            </New>
+                        </Item>
+                        <Item>
+                            <New class="org.eclipse.jetty.server.HttpConnectionFactory">
+                                <Arg name="config">
+                                    <Ref id="httpConfig"/>
+                                </Arg>
+                            </New>
+                        </Item>
+                    </Array>
+                </Arg>
+                <Set name="port">8443</Set>
+            </New>
+        </Arg>
+    </Call>
+
+    <Call name="addConnector">
+        <Arg>
+            <New class="org.eclipse.jetty.server.ServerConnector">
+                <Arg name="server">
+                    <Ref id="Server"/>
+                </Arg>
+                <Arg name="factories">
+                    <Array type="org.eclipse.jetty.server.ConnectionFactory">
+                        <Item>
+                            <New class="org.eclipse.jetty.server.SslConnectionFactory">
+                                <Arg name="sslContextFactory">
+                                    <Ref id="sslContextFactory"/>
+                                </Arg>
+                                <Arg name="next">alpn</Arg>
+                            </New>
+                        </Item>
+                        <Item>
+                            <New class="org.eclipse.jetty.alpn.server.ALPNServerConnectionFactory">
+                                <Arg>h2,h2-17</Arg>
+                            </New>
+                        </Item>
+                        <Item>
+                            <New class="org.eclipse.jetty.http2.server.HTTP2ServerConnectionFactory">
+                                <Arg name="config">
+                                    <Ref id="httpConfig"/>
+                                </Arg>
+                            </New>
+                        </Item>
+                    </Array>
+                </Arg>
+                <Set name="Port">8444</Set>
+            </New>
+        </Arg>
+    </Call>
+</Configure>

libraries-server/src/main/java/com/baeldung/jetty/http2/Http2JettyServlet.java

@@ -0,0 +1,29 @@
+package com.baeldung.jetty.http2;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class Http2JettyServlet extends HttpServlet {
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.addHeader("Cache-control", "no-store, no-cache, must-revalidate");
+        response.addDateHeader("Last-Modified", 0);
+        response.addDateHeader("Expires", 0);
+
+        String requestPath = request.getRequestURI();
+        InputStream input = getServletContext().getResourceAsStream(requestPath);
+        OutputStream output = response.getOutputStream();
+        byte[] buffer = new byte[1024];
+        int read;
+        while ((read = input.read(buffer)) >= 0) {
+            output.write(buffer, 0, read);            
+        }
+    }
+    
+}

libraries-server/src/main/webapp/WEB-INF/web.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app 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/web-app_3_1.xsd"
+         version="3.1">
+
+    <servlet>
+        <servlet-name>http2Jetty</servlet-name>
+        <servlet-class>com.baeldung.jetty.http2.Http2JettyServlet</servlet-class>
+    </servlet>
+    <servlet-mapping>
+        <servlet-name>http2Jetty</servlet-name>
+        <url-pattern>/images/*</url-pattern>
+    </servlet-mapping>
+
+    <filter>
+        <filter-name>push</filter-name>
+        <filter-class>org.eclipse.jetty.servlets.PushCacheFilter</filter-class>
+        <init-param>
+            <param-name>ports</param-name>
+            <param-value>8444</param-value>
+        </init-param>
+        <init-param>
+            <param-name>maxAssociations</param-name>
+            <param-value>32</param-value>
+        </init-param>
+    </filter>
+    <filter-mapping>
+        <filter-name>push</filter-name>
+        <url-pattern>/*</url-pattern>
+    </filter-mapping>
+
+</web-app>

libraries-server/src/main/webapp/http2.html

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Baeldung HTTP/2 Client in Jetty</title>
+</head>
+<body>
+    <h2>HTTP/2 Demo</h2>
+    <div>
+        <img src="images/homepage-latest_articles.jpg" alt="latest articles" />
+        <img src="images/homepage-rest_with_spring.jpg" alt="rest with spring" />
+        <img src="images/homepage-weekly_reviews.jpg" alt="weekly reviews" />
+    </div>
+</body>
+</html>

libraries-server/src/main/webapp/index.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Baeldung: HTTP2 Client in Jetty</title>
+</head>
+<body style="margin:100px 200px">
+    <a href="https://localhost:8443/http2.html"><h1>HTTP/1.1</h1></a>
+    <br />
+    <a href="https://localhost:8444/http2.html"><h1>HTTP/2 Push</h1></a>
+    <br />
+</body>
+</html>

persistence-modules/r2dbc/pom.xml

@@ -6,7 +6,7 @@
     <groupId>com.baeldung.examples.r2dbc</groupId>
     <artifactId>r2dbc-example</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-    <name>r2dbc-example</name>
+    <name>r2dbc</name>
     <description>Sample R2DBC Project</description>
 
     <parent>

persistence-modules/sirix/pom.xml

@@ -4,7 +4,7 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>io.sirix</groupId>
-    <artifactId>core-api-tutorial</artifactId>
+    <artifactId>sirix</artifactId>
     <version>1.0-SNAPSHOT</version>
     <name>core-api-tutorial</name>
     <packaging>jar</packaging>