Merge remote-tracking branch 'upstream/master'

apache-meecrowave/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles: 
+================================
+- [Building a Microservice with Apache Meecrowave](http://www.baeldung.com/apache-meecrowave)

core-java-8/README.md

@@ -54,3 +54,5 @@
 - [Java 8 Unsigned Arithmetic Support](http://www.baeldung.com/java-unsigned-arithmetic)
 - [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
 - [Generalized Target-Type Inference in Java](http://www.baeldung.com/java-generalized-target-type-inference)
+- [Image to Base64 String Conversion](http://www.baeldung.com/java-base64-image-string)
+- [Calculate Age in Java](http://www.baeldung.com/java-get-age)

core-java-8/src/test/java/com/baeldung/list/AddElementsUnitTest.java

@@ -0,0 +1,87 @@
+package com.baeldung.list;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.*;
+
+import static org.junit.Assert.*;
+
+public class AddElementsUnitTest {
+
+    List<Flower> flowers;
+
+    @Before
+    public void init() {
+        this.flowers = new ArrayList<>(Arrays.asList(
+                new Flower("Poppy", 12),
+                new Flower("Anemone", 8),
+                new Flower("Catmint", 12)));
+    }
+
+    @Test
+    public void givenAList_whenTargetListIsEmpty_thenReturnTargetListWithNewItems() {
+        List<Flower> anotherList = new ArrayList<>();
+        anotherList.addAll(flowers);
+
+        assertEquals(anotherList.size(), flowers.size());
+        Assert.assertTrue(anotherList.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenTargetListIsEmpty_thenReturnTargetListWithOneModifiedElementByConstructor() {
+        List<Flower> anotherList = new ArrayList<>();
+        anotherList.addAll(flowers);
+
+        Flower flower = anotherList.get(0);
+        flower.setPetals(flowers.get(0).getPetals() * 3);
+
+        assertEquals(anotherList.size(), flowers.size());
+        Assert.assertTrue(anotherList.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAListAndElements_whenUseCollectionsAddAll_thenAddElementsToTargetList() {
+        List<Flower> target = new ArrayList<>();
+
+        Collections.addAll(target, flowers.get(0), flowers.get(1), flowers.get(2), flowers.get(0));
+
+        assertEquals(target.size(), 4);
+    }
+
+    @Test
+    public void givenTwoList_whenSourceListDoesNotHaveNullElements_thenAddElementsToTargetListSkipFirstElementByStreamProcess() {
+        List<Flower> flowerVase = new ArrayList<>();
+
+        flowers.stream()
+                .skip(1)
+                .forEachOrdered(flowerVase::add);
+
+        assertEquals(flowerVase.size() + 1, flowers.size());
+        assertFalse(flowerVase.containsAll(flowers));
+    }
+
+    @Test
+    public void givenTwoList_whenSourceListDoesNotHaveNullElements_thenAddElementsToTargetListFilteringElementsByStreamProcess() {
+        List<Flower> flowerVase = new ArrayList<>();
+
+        flowers.stream()
+                .filter(f -> f.getPetals() > 10)
+                .forEachOrdered(flowerVase::add);
+
+        assertEquals(flowerVase.size() + 1, flowers.size());
+        assertFalse(flowerVase.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListIsNotNull_thenAddElementsToListByStreamProcessWihtOptional() {
+        List<Flower> target = new ArrayList<>();
+
+        Optional.ofNullable(flowers)
+                .ifPresent(target::addAll);
+
+        assertNotNull(target);
+        assertEquals(target.size(), 3);
+    }
+}

core-java-9/pom.xml

@@ -19,11 +19,23 @@
             <version>${awaitility.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
             <version>${guava.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -50,6 +62,8 @@
 
     <properties>
         <!-- testing -->
+        <assertj.version>3.10.0</assertj.version>
+        <junit.platform.version>1.2.0</junit.platform.version>
         <awaitility.version>1.7.0</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

core-java-9/src/main/java/com/baeldung/java9/language/stream/StreamsGroupingCollectionFilter.java

@@ -0,0 +1,27 @@
+package com.baeldung.java9.language.stream;
+
+import static java.util.stream.Collectors.filtering;
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.toList;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+
+public class StreamsGroupingCollectionFilter {
+
+    static public Map<Integer, List<Integer>> findEvenNumbersAfterGroupingByQuantityOfDigits(Collection<Integer> baseCollection) {
+        Function<Integer, Integer> getQuantityOfDigits = item -> (int) Math.log10(item) + 1;
+
+        return baseCollection.stream()
+            .collect(groupingBy(getQuantityOfDigits, filtering(item -> item % 2 == 0, toList())));
+    }
+
+    static public Map<Integer, List<Integer>> findEvenNumbersBeforeGroupingByQuantityOfDigits(Collection<Integer> baseCollection) {
+
+        return baseCollection.stream()
+            .filter(item -> item % 2 == 0)
+            .collect(groupingBy(item -> (int) Math.log10(item) + 1, toList()));
+    }
+}

core-java-9/src/test/java/com/baeldung/java9/language/stream/CollectionFilterUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.java9.language.stream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+public class CollectionFilterUnitTest {
+
+    private static final Collection<Integer> BASE_INTEGER_COLLECTION = Arrays.asList(9, 12, 55, 56, 101, 115, 8002, 223, 2668, 19, 8);
+    private static final Map<Integer, List<Integer>> EXPECTED_EVEN_FILTERED_AFTER_GROUPING_MAP = createExpectedFilterAfterGroupingMap();
+    private static Map<Integer, List<Integer>> createExpectedFilterAfterGroupingMap() {
+        Map<Integer, List<Integer>> map = new HashMap<>();
+        map.put(1, Arrays.asList(8));
+        map.put(2, Arrays.asList(12, 56));
+        map.put(3, Collections.emptyList());
+        map.put(4, Arrays.asList(8002, 2668));
+        return map;
+
+    }
+
+    private static final Map<Integer, List<Integer>> EXPECTED_EVEN_FILTERED_BEFORE_GROUPING_MAP = createExpectedFilterBeforeGroupingMap();
+    private static Map<Integer, List<Integer>> createExpectedFilterBeforeGroupingMap() {
+        Map<Integer, List<Integer>> map = new HashMap<>();
+        map.put(1, Arrays.asList(8));
+        map.put(2, Arrays.asList(12, 56));
+        map.put(4, Arrays.asList(8002, 2668));
+        return map;
+
+    }
+
+    @Test
+    public void givenAStringCollection_whenFilteringFourLetterWords_thenObtainTheFilteredCollection() {
+        Map<Integer, List<Integer>> filteredAfterGroupingMap = StreamsGroupingCollectionFilter.findEvenNumbersAfterGroupingByQuantityOfDigits(BASE_INTEGER_COLLECTION);
+        Map<Integer, List<Integer>> filteredBeforeGroupingMap = StreamsGroupingCollectionFilter.findEvenNumbersBeforeGroupingByQuantityOfDigits(BASE_INTEGER_COLLECTION);
+
+        assertThat(filteredAfterGroupingMap).containsAllEntriesOf(EXPECTED_EVEN_FILTERED_AFTER_GROUPING_MAP);
+        assertThat(filteredBeforeGroupingMap).doesNotContainKey(3)
+            .containsAllEntriesOf(EXPECTED_EVEN_FILTERED_BEFORE_GROUPING_MAP);
+    }
+
+}

core-java-collections/README.md

@@ -30,3 +30,4 @@
 - [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
 - [How to Store Duplicate Keys in a Map in Java?](http://www.baeldung.com/java-map-duplicate-keys)
 - [Getting the Size of an Iterable in Java](http://www.baeldung.com/java-iterable-size)
+- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)

core-java-collections/pom.xml

@@ -36,19 +36,37 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections-api</artifactId>
+            <version>${eclipse.collections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections</artifactId>
+            <version>${eclipse.collections.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>
+        <junit.platform.version>1.2.0</junit.platform.version>
         <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <avaitility.version>1.7.0</avaitility.version>
         <assertj.version>3.6.1</assertj.version>
+        <eclipse.collections.version>9.2.0</eclipse.collections.version>
     </properties>
 </project>

core-java-collections/src/main/java/com/baeldung/java/filtering/CollectionUtilsCollectionFilter.java

@@ -0,0 +1,16 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+
+import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.collections4.Predicate;
+
+public class CollectionUtilsCollectionFilter {
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> apacheEventNumberPredicate = item -> item % 2 == 0;
+
+        CollectionUtils.filter(baseCollection, apacheEventNumberPredicate);
+        return baseCollection;
+    }
+}

core-java-collections/src/main/java/com/baeldung/java/filtering/EclipseCollectionsCollectionFilter.java

@@ -0,0 +1,32 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+
+import org.eclipse.collections.api.block.predicate.Predicate;
+import org.eclipse.collections.impl.factory.Lists;
+import org.eclipse.collections.impl.utility.Iterate;
+
+public class EclipseCollectionsCollectionFilter {
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> eclipsePredicate = item -> item % 2 == 0;
+        Collection<Integer> filteredList = Lists.mutable.ofAll(baseCollection)
+            .select(eclipsePredicate);
+
+        return filteredList;
+    }
+
+    static public Collection<Integer> findEvenNumbersUsingIterate(Collection<Integer> baseCollection) {
+        Predicate<Integer> eclipsePredicate = new Predicate<Integer>() {
+            private static final long serialVersionUID = 1L;
+
+            @Override
+            public boolean accept(Integer arg0) {
+                return arg0 % 2 == 0;
+            }
+        };
+        Collection<Integer> filteredList = Iterate.select(baseCollection, eclipsePredicate);
+
+        return filteredList;
+    }
+}

core-java-collections/src/main/java/com/baeldung/java/filtering/GuavaCollectionFilter.java

@@ -0,0 +1,17 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+
+import com.google.common.base.Predicate;
+import com.google.common.collect.Collections2;
+
+public class GuavaCollectionFilter {
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> guavaPredicate = item -> item % 2 == 0;
+
+        Collection<Integer> filteredCollection = Collections2.filter(baseCollection, guavaPredicate);
+        return filteredCollection;
+    }
+
+}

core-java-collections/src/main/java/com/baeldung/java/filtering/StreamsCollectionFilter.java

@@ -0,0 +1,26 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+public class StreamsCollectionFilter {
+
+    public static <T> Collection<T> filterCollectionHelperMethod(Collection<T> baseCollection, Predicate<T> predicate) {
+        return baseCollection.stream()
+            .filter(predicate)
+            .collect(Collectors.toList());
+    }
+
+    static public Collection<Integer> findEvenNumbersUsingHelperMethod(Collection<Integer> baseCollection) {
+        return filterCollectionHelperMethod(baseCollection, item -> item % 2 == 0);
+    }
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> streamsPredicate = item -> item % 2 == 0;
+
+        return baseCollection.stream()
+            .filter(streamsPredicate)
+            .collect(Collectors.toList());
+    }
+}

core-java-collections/src/test/java/com/baeldung/java/filtering/CollectionFiltersUnitTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.java.filtering;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+
+import org.junit.jupiter.api.Test;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+public class CollectionFiltersUnitTest {
+
+    private static final Collection<Integer> BASE_INTEGER_COLLECTION = Arrays.asList(9, 14, 2, 7, 1, 5, 8);
+    private static final Collection<Integer> EXPECTED_EVEN_FILTERED_COLLECTION = Arrays.asList(14, 2, 8);
+
+    @Test
+    public void givenAStringCollection_whenFilteringFourLetterWords_thenObtainTheFilteredCollection() {
+        final Collection<String> baseStrings = Arrays.asList("java", "baeldung", "type", "example", "other");
+
+        Collection<String> filtered = StreamsCollectionFilter.filterCollectionHelperMethod(baseStrings, item -> item.length() == 4);
+
+        assertThat(filtered).containsExactlyInAnyOrder("java", "type");
+    }
+
+    @Test
+    public void givenAnIntegerCollection_whenFilteringEvenValues_thenObtainTheFilteredCollectionForAllCases() {
+        Collection<Integer> filteredWithStreams1 = StreamsCollectionFilter.findEvenNumbers(BASE_INTEGER_COLLECTION);
+        Collection<Integer> filteredWithCollectionUtils = CollectionUtilsCollectionFilter.findEvenNumbers(new ArrayList<>(BASE_INTEGER_COLLECTION));
+        Collection<Integer> filteredWithEclipseCollections = EclipseCollectionsCollectionFilter.findEvenNumbers(BASE_INTEGER_COLLECTION);
+        Collection<Integer> filteredWithEclipseCollectionsUsingIterate = EclipseCollectionsCollectionFilter.findEvenNumbersUsingIterate(BASE_INTEGER_COLLECTION);
+        Collection<Integer> filteredWithGuava = GuavaCollectionFilter.findEvenNumbers(BASE_INTEGER_COLLECTION);
+
+        assertThat(filteredWithStreams1).hasSameElementsAs(filteredWithCollectionUtils)
+            .hasSameElementsAs(filteredWithEclipseCollections)
+            .hasSameElementsAs(filteredWithEclipseCollectionsUsingIterate)
+            .hasSameElementsAs(filteredWithEclipseCollectionsUsingIterate)
+            .hasSameElementsAs(filteredWithGuava)
+            .hasSameElementsAs(EXPECTED_EVEN_FILTERED_COLLECTION);
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/list/removefirst/RemoveFirstElementUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.list.removefirst;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class RemoveFirstElementUnitTest {
+
+    private List<String> list = new ArrayList<>();
+    private LinkedList<String> linkedList = new LinkedList<>();
+
+    @Before
+    public void init() {
+
+        list.add("cat");
+        list.add("dog");
+        list.add("pig");
+        list.add("cow");
+        list.add("goat");
+
+        linkedList.add("cat");
+        linkedList.add("dog");
+        linkedList.add("pig");
+        linkedList.add("cow");
+        linkedList.add("goat");
+    }
+
+    @Test
+    public void givenList_whenRemoveFirst_thenRemoved() {
+        list.remove(0);
+
+        assertThat(list, hasSize(4));
+        assertThat(list, not(contains("cat")));
+    }
+
+    @Test
+    public void givenLinkedList_whenRemoveFirst_thenRemoved() {
+
+        linkedList.removeFirst();
+
+        assertThat(linkedList, hasSize(4));
+        assertThat(linkedList, not(contains("cat")));
+    }
+
+}

core-java-io/README.md

@@ -28,3 +28,5 @@
 - [Guide to Java NIO2 Asynchronous Channel APIs](http://www.baeldung.com/java-nio-2-async-channels)
 - [A Guide to NIO2 Asynchronous Socket Channel](http://www.baeldung.com/java-nio2-async-socket-channel)
 - [Download a File From an URL in Java](http://www.baeldung.com/java-download-file)
+- [Create a Symbolic Link with Java](http://www.baeldung.com/java-symlink)
+- [Quick Use of FilenameFilter](http://www.baeldung.com/java-filename-filter)

core-java-persistence/pom.xml

@@ -0,0 +1,59 @@
+<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.core-java-persistence</groupId>
+    <artifactId>core-java-persistence</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>core-java-persistence</name>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>${h2database.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-dbcp2</artifactId>
+            <version>${commons-dbcp2.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.zaxxer</groupId>
+            <artifactId>HikariCP</artifactId>
+            <version>${HikariCP.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.mchange</groupId>
+            <artifactId>c3p0</artifactId>
+            <version>${c3p0.version}</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <finalName>core-java-persistence</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>    
+    <properties>
+        <assertj-core.version>3.10.0</assertj-core.version>
+        <h2database.version>1.4.197</h2database.version>
+        <commons-dbcp2.version>2.4.0</commons-dbcp2.version>
+        <HikariCP.version>3.2.0</HikariCP.version>
+        <c3p0.version>0.9.5.2</c3p0.version>
+    </properties>
+</project>

core-java-persistence/src/main/java/com/baeldung/connectionpool/BasicConnectionPool.java

@@ -1,85 +1,92 @@
-package com.baeldung.connectionpool.connectionpools;
-
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.util.ArrayList;
-import java.util.List;
-
-public class BasicConnectionPool implements ConnectionPool {
-
-    private final String url;
-    private final String user;
-    private final String password;
-    private final List<Connection> connectionPool;
-    private final List<Connection> usedConnections = new ArrayList<>();
-    private static final int INITIAL_POOL_SIZE = 10;
-    private final int MAX_POOL_SIZE = 20;
-    
-    public static BasicConnectionPool create(String url, String user, String password) throws SQLException {
-        List<Connection> pool = new ArrayList<>(INITIAL_POOL_SIZE);
-        for (int i = 0; i < INITIAL_POOL_SIZE; i++) {
-            pool.add(createConnection(url, user, password));
-        }
-        return new BasicConnectionPool(url, user, password, pool);
-    }
-    
-    private BasicConnectionPool(String url, String user, String password, List<Connection> connectionPool) {
-        this.url = url;
-        this.user = user;
-        this.password = password;
-        this.connectionPool = connectionPool;
-    }
-    
-    @Override
-    public Connection getConnection() throws SQLException {
-        if (connectionPool.isEmpty()) {
-            if (usedConnections.size() < MAX_POOL_SIZE) {
-                connectionPool.add(createConnection(url, user, password));
-            } else {
-                throw new RuntimeException("Maximum pool size reached, no available connections!");
-            }
-        }
-
-        Connection connection = connectionPool.remove(connectionPool.size() - 1);
-        usedConnections.add(connection);
-        return connection;
-    }
-    
-    @Override
-    public boolean releaseConnection(Connection connection) {
-        connectionPool.add(connection);
-        return usedConnections.remove(connection);
-    }
-    
-    private static Connection createConnection(String url, String user, String password) throws SQLException {
-        return DriverManager.getConnection(url, user, password);
-    }
-    
-    public int getSize() {
-        return connectionPool.size() + usedConnections.size();
-    }
-
-    @Override
-    public String getUrl() {
-        return url;
-    }
-
-    @Override
-    public String getUser() {
-        return user;
-    }
-
-    @Override
-    public String getPassword() {
-        return password;
-    }
-
-    public void shutdown() throws SQLException {
-        usedConnections.forEach(this::releaseConnection);
-        for (Connection c : connectionPool) {
-            c.close();
-        }
-        connectionPool.clear();
-    }
-}
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BasicConnectionPool implements ConnectionPool {
+
+    private final String url;
+    private final String user;
+    private final String password;
+    private final List<Connection> connectionPool;
+    private final List<Connection> usedConnections = new ArrayList<>();
+    private static final int INITIAL_POOL_SIZE = 10;
+    private final int MAX_POOL_SIZE = 20;
+
+    public static BasicConnectionPool create(String url, String user, String password) throws SQLException {
+        List<Connection> pool = new ArrayList<>(INITIAL_POOL_SIZE);
+        for (int i = 0; i < INITIAL_POOL_SIZE; i++) {
+            pool.add(createConnection(url, user, password));
+        }
+        return new BasicConnectionPool(url, user, password, pool);
+    }
+
+    private BasicConnectionPool(String url, String user, String password, List<Connection> connectionPool) {
+        this.url = url;
+        this.user = user;
+        this.password = password;
+        this.connectionPool = connectionPool;
+    }
+
+    @Override
+    public Connection getConnection() throws SQLException {
+        if (connectionPool.isEmpty()) {
+            if (usedConnections.size() < MAX_POOL_SIZE) {
+                connectionPool.add(createConnection(url, user, password));
+            } else {
+                throw new RuntimeException("Maximum pool size reached, no available connections!");
+            }
+        }
+
+        Connection connection = connectionPool.remove(connectionPool.size() - 1);
+        usedConnections.add(connection);
+        return connection;
+    }
+
+    @Override
+    public boolean releaseConnection(Connection connection) {
+        connectionPool.add(connection);
+        return usedConnections.remove(connection);
+    }
+
+    private static Connection createConnection(String url, String user, String password) throws SQLException {
+        return DriverManager.getConnection(url, user, password);
+    }
+
+    @Override
+    public int getSize() {
+        return connectionPool.size() + usedConnections.size();
+    }
+
+    @Override
+    public List<Connection> getConnectionPool() {
+        return connectionPool;
+    }
+    
+    @Override
+    public String getUrl() {
+        return url;
+    }
+
+    @Override
+    public String getUser() {
+        return user;
+    }
+
+    @Override
+    public String getPassword() {
+        return password;
+    }
+    
+    @Override
+    public void shutdown() throws SQLException {
+        usedConnections.forEach(this::releaseConnection);
+        for (Connection c : connectionPool) {
+            c.close();
+        }
+        connectionPool.clear();
+    }
+}

core-java-persistence/src/main/java/com/baeldung/connectionpool/C3poDataSource.java

@@ -1,28 +1,28 @@
-package com.baeldung.connectionpool.connectionpools;
-
-import com.mchange.v2.c3p0.ComboPooledDataSource;
-import java.beans.PropertyVetoException;
-import java.sql.Connection;
-import java.sql.SQLException;
-
-public class C3poDataSource {
-
-    private static final ComboPooledDataSource cpds = new ComboPooledDataSource();
-
-    static {
-        try {
-            cpds.setDriverClass("org.h2.Driver");
-            cpds.setJdbcUrl("jdbc:h2:mem:test");
-            cpds.setUser("user");
-            cpds.setPassword("password");
-        } catch (PropertyVetoException e) {
-            e.printStackTrace();
-        }
-    }
-    
-    public static Connection getConnection() throws SQLException {
-        return cpds.getConnection();
-    }
-    
-    private C3poDataSource(){}
+package com.baeldung.connectionpool;
+
+import com.mchange.v2.c3p0.ComboPooledDataSource;
+import java.beans.PropertyVetoException;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class C3poDataSource {
+
+    private static final ComboPooledDataSource cpds = new ComboPooledDataSource();
+
+    static {
+        try {
+            cpds.setDriverClass("org.h2.Driver");
+            cpds.setJdbcUrl("jdbc:h2:mem:test");
+            cpds.setUser("user");
+            cpds.setPassword("password");
+        } catch (PropertyVetoException e) {
+            e.printStackTrace();
+        }
+    }
+    
+    public static Connection getConnection() throws SQLException {
+        return cpds.getConnection();
+    }
+    
+    private C3poDataSource(){}
 }

core-java-persistence/src/main/java/com/baeldung/connectionpool/ConnectionPool.java

@@ -1,18 +1,24 @@
-package com.baeldung.connectionpool.connectionpools;
-
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.util.List;
-
-public interface ConnectionPool {
-
-    Connection getConnection() throws SQLException;
-    
-    boolean releaseConnection(Connection connection);
-    
-    String getUrl();
-    
-    String getUser();
-
-    String getPassword();
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.List;
+
+public interface ConnectionPool {
+
+    Connection getConnection() throws SQLException;
+    
+    boolean releaseConnection(Connection connection);
+    
+    List<Connection> getConnectionPool();
+    
+    int getSize();
+    
+    String getUrl();
+    
+    String getUser();
+
+    String getPassword();
+    
+    void shutdown() throws SQLException;;
 }   

core-java-persistence/src/main/java/com/baeldung/connectionpool/DBCPDataSource.java

@@ -1,25 +1,25 @@
-package com.baeldung.connectionpool.connectionpools;
-
-import java.sql.Connection;
-import java.sql.SQLException;
-import org.apache.commons.dbcp2.BasicDataSource;
-
-public class DBCPDataSource {
-    
-    private static final BasicDataSource ds = new BasicDataSource();
-    
-    static {
-        ds.setUrl("jdbc:h2:mem:test");
-        ds.setUsername("user");
-        ds.setPassword("password");
-        ds.setMinIdle(5);
-        ds.setMaxIdle(10);
-        ds.setMaxOpenPreparedStatements(100);
-    }
-    
-    public static Connection getConnection() throws SQLException {
-        return ds.getConnection();
-    }
-    
-    private DBCPDataSource(){}
-}
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import org.apache.commons.dbcp2.BasicDataSource;
+
+public class DBCPDataSource {
+    
+    private static final BasicDataSource ds = new BasicDataSource();
+    
+    static {
+        ds.setUrl("jdbc:h2:mem:test");
+        ds.setUsername("user");
+        ds.setPassword("password");
+        ds.setMinIdle(5);
+        ds.setMaxIdle(10);
+        ds.setMaxOpenPreparedStatements(100);
+    }
+    
+    public static Connection getConnection() throws SQLException {
+        return ds.getConnection();
+    }
+    
+    private DBCPDataSource(){}
+}

core-java-persistence/src/main/java/com/baeldung/connectionpool/HikariCPDataSource.java

@@ -1,28 +1,28 @@
-package com.baeldung.connectionpool.connectionpools;
-
-import com.zaxxer.hikari.HikariConfig;
-import com.zaxxer.hikari.HikariDataSource;
-import java.sql.Connection;
-import java.sql.SQLException;
-
-public class HikariCPDataSource {
-    
-    private static final HikariConfig config = new HikariConfig();
-    private static final HikariDataSource ds;
-    
-    static {
-        config.setJdbcUrl("jdbc:h2:mem:test");
-        config.setUsername("user");
-        config.setPassword("password");
-        config.addDataSourceProperty("cachePrepStmts", "true");
-        config.addDataSourceProperty("prepStmtCacheSize", "250");
-        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
-        ds = new HikariDataSource(config);
-    }
-    
-    public static Connection getConnection() throws SQLException {
-        return ds.getConnection();
-    }
-    
-    private HikariCPDataSource(){}
-}
+package com.baeldung.connectionpool;
+
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class HikariCPDataSource {
+    
+    private static final HikariConfig config = new HikariConfig();
+    private static final HikariDataSource ds;
+    
+    static {
+        config.setJdbcUrl("jdbc:h2:mem:test");
+        config.setUsername("user");
+        config.setPassword("password");
+        config.addDataSourceProperty("cachePrepStmts", "true");
+        config.addDataSourceProperty("prepStmtCacheSize", "250");
+        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
+        ds = new HikariDataSource(config);
+    }
+    
+    public static Connection getConnection() throws SQLException {
+        return ds.getConnection();
+    }
+    
+    private HikariCPDataSource(){}
+}

core-java-persistence/src/test/java/com/baeldung/connectionpool/BasicConnectionPoolUnitTest.java

@@ -1,10 +1,8 @@
 package com.baeldung.connectionpool;
 
-import com.baeldung.connectionpool.connectionpools.BasicConnectionPool;
-import com.baeldung.connectionpool.connectionpools.ConnectionPool;
 import java.sql.Connection;
 import java.sql.SQLException;
-import java.util.List;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;

core-java-persistence/src/test/java/com/baeldung/connectionpool/C3poDataSourceUnitTest.java

@@ -1,6 +1,5 @@
 package com.baeldung.connectionpool;
 
-import com.baeldung.connectionpool.connectionpools.C3poDataSource;
 import java.sql.SQLException;
 import static org.junit.Assert.assertTrue;
 import org.junit.Test;

core-java-persistence/src/test/java/com/baeldung/connectionpool/DBCPDataSourceUnitTest.java

@@ -1,6 +1,5 @@
 package com.baeldung.connectionpool;
 
-import com.baeldung.connectionpool.connectionpools.DBCPDataSource;
 import java.sql.SQLException;
 import static org.junit.Assert.assertTrue;
 import org.junit.Test;

core-java-persistence/src/test/java/com/baeldung/connectionpool/HikariCPDataSourceUnitTest.java

@@ -1,6 +1,5 @@
 package com.baeldung.connectionpool;
 
-import com.baeldung.connectionpool.connectionpools.HikariCPDataSource;
 import java.sql.SQLException;
 import static org.junit.Assert.assertTrue;
 import org.junit.Test;

core-java/README.md

@@ -163,3 +163,8 @@
 - [Console I/O in Java](http://www.baeldung.com/java-console-input-output)
 - [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
 - [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)
+- [Guide to java.util.GregorianCalendar](http://www.baeldung.com/java-gregorian-calendar)
+- [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
+- [Encrypting and Decrypting Files in Java](http://www.baeldung.com/java-cipher-input-output-stream)
+- [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
+- [Exception Handling in Java](http://www.baeldung.com/java-exceptions)

core-java/pom.xml

@@ -158,21 +158,6 @@
             <artifactId>jmimemagic</artifactId>
             <version>${jmime-magic.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-dbcp2</artifactId>
-            <version>${commons-dbcp2.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.zaxxer</groupId>
-            <artifactId>HikariCP</artifactId>
-            <version>${HikariCP.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.mchange</groupId>
-            <artifactId>c3p0</artifactId>
-            <version>${c3p0.version}</version>
-        </dependency>
         <!-- instrumentation -->
         <dependency>
             <groupId>org.javassist</groupId>
@@ -544,11 +529,6 @@
         <!-- testing -->
         <assertj-core.version>3.10.0</assertj-core.version>
 
-        <!-- JDBC pooling frameworks -->
-        <commons-dbcp2.version>2.4.0</commons-dbcp2.version>
-        <HikariCP.version>3.2.0</HikariCP.version>
-        <c3p0.version>0.9.5.2</c3p0.version>
-        
         <!-- maven plugins -->
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>

core-kotlin/README.md

@@ -34,3 +34,5 @@
 - [Java EE 8 Security API](http://www.baeldung.com/java-ee-8-security)
 - [Kotlin with Ktor](http://www.baeldung.com/kotlin-ktor)
 - [Working with Enums in Kotlin](http://www.baeldung.com/kotlin-enum)
+- [Create a Java and Kotlin Project with Maven](http://www.baeldung.com/kotlin-maven-java-project)
+- [Reflection with Kotlin](http://www.baeldung.com/kotlin-reflection)

google-web-toolkit/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles: 
+- [Introduction to GWT](http://www.baeldung.com/gwt)

google-web-toolkit/pom.xml

@@ -6,10 +6,16 @@
 	<!-- POM file generated with GWT webAppCreator -->
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.baeldung</groupId>
-	<artifactId>google-web-toolkit</artifactId>
+	<artifactId>google_web_toolkit</artifactId>
 	<packaging>war</packaging>
 	<version>1.0-SNAPSHOT</version>
 
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
 	<dependencyManagement>
 		<dependencies>
 			<!-- ensure all GWT deps use the same version (unless overridden) -->

google-web-toolkit/src/main/java/com/baeldung/Google_web_toolkit.gwt.xml

@@ -22,6 +22,8 @@
   <!-- Specify the app entry point class.                         -->
   <entry-point class='com.baeldung.client.Google_web_toolkit'/>
 
+  <set-property name="user.agent" value="gecko1_8"/>
+
   <!-- Specify the paths for translatable code                    -->
   <source path='client'/>
   <source path='shared'/>

libraries/README.md

@@ -85,7 +85,7 @@
 - [Implementing a FTP-Client in Java](http://www.baeldung.com/java-ftp-client)
 - [Convert String to Date in Java](http://www.baeldung.com/java-string-to-date)
 - [Histograms with Apache Commons Frequency](http://www.baeldung.com/apache-commons-frequency)
-
+- [Guide to Resilience4j](http://www.baeldung.com/resilience4j)
 
 The libraries module contains examples related to small libraries that are relatively easy to use and does not require any separate module of its own.
 

logging-modules/log4j2/pom.xml

@@ -18,6 +18,13 @@
             <artifactId>log4j-core</artifactId>
             <version>${log4j-core.version}</version>
         </dependency>
+        
+        <!-- This is the needed API component. -->
+        <dependency>
+          <groupId>org.apache.logging.log4j</groupId>
+          <artifactId>log4j-api</artifactId>
+          <version>${log4j-core.version}</version>
+        </dependency>
 
         <!-- This is used by JSONLayout. -->
         <dependency>
@@ -114,4 +121,4 @@
         <maven.build.timestamp.format>yyyyMMddHHmmss</maven.build.timestamp.format>
     </properties>
 
-</project>
+</project>

logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/appender/MapAppender.java

@@ -0,0 +1,54 @@
+/**
+ * 
+ */
+package com.baeldung.logging.log4j2.appender;
+
+import java.time.Instant;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.Core;
+import org.apache.logging.log4j.core.Filter;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.appender.AbstractAppender;
+import org.apache.logging.log4j.core.config.plugins.Plugin;
+import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
+import org.apache.logging.log4j.core.config.plugins.PluginElement;
+import org.apache.logging.log4j.core.config.plugins.PluginFactory;
+
+@Plugin(name = "MapAppender", category = Core.CATEGORY_NAME, elementType = Appender.ELEMENT_TYPE)
+public class MapAppender extends AbstractAppender {
+
+    private ConcurrentMap<String, LogEvent> eventMap = new ConcurrentHashMap<>();
+
+    protected MapAppender(String name, Filter filter) {
+        super(name, filter, null);
+    }
+
+    @PluginFactory
+    public static MapAppender createAppender(@PluginAttribute("name") String name, @PluginElement("Filter") final Filter filter) {
+        return new MapAppender(name, filter);
+    }
+
+    @Override
+    public void append(LogEvent event) {
+        if (event.getLevel()
+            .isLessSpecificThan(Level.WARN)) {
+            error("Unable to log less than WARN level.");
+            return;
+        }
+        eventMap.put(Instant.now()
+            .toString(), event);
+    }
+
+    public ConcurrentMap<String, LogEvent> getEventMap() {
+        return eventMap;
+    }
+
+    public void setEventMap(ConcurrentMap<String, LogEvent> eventMap) {
+        this.eventMap = eventMap;
+    }
+
+}

logging-modules/log4j2/src/test/java/com/baeldung/logging/log4j2/appender/MapAppenderIntegrationTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.logging.log4j2.appender;
+
+import static org.junit.Assert.assertEquals;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class MapAppenderIntegrationTest {
+
+    private Logger logger;
+
+    @Before
+    public void setup() {
+        logger = LogManager.getLogger(MapAppenderIntegrationTest.class);
+    }
+
+    @Test
+    public void whenLoggerEmitsLoggingEvent_thenAppenderReceivesEvent() throws Exception {
+        logger.info("Test from {}", this.getClass()
+            .getSimpleName());
+        LoggerContext context = LoggerContext.getContext(false);
+        Configuration config = context.getConfiguration();
+        MapAppender appender = config.getAppender("MapAppender");
+        assertEquals(appender.getEventMap()
+            .size(), 1);
+    }
+
+}

logging-modules/log4j2/src/test/resources/log4j2.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Configuration xmlns:xi="http://www.w3.org/2001/XInclude"
-    status="WARN">
+<Configuration xmlns:xi="http://www.w3.org/2001/XInclude" 
+    packages="com.baeldung" status="WARN">
     <Appenders>
         <xi:include
             href="log4j2-includes/console-appender_pattern-layout_colored.xml" />
@@ -50,6 +50,7 @@
                     size="17 kB" />
             </Policies>
         </RollingFile>
+        <MapAppender name="MapAppender"/>
     </Appenders>
     <Loggers>
         <Logger name="CONSOLE_PATTERN_APPENDER_MARKER" level="TRACE"
@@ -82,6 +83,7 @@
         </Logger>
         <Root level="DEBUG">
             <AppenderRef ref="ConsoleAppender" />
+            <AppenderRef ref="MapAppender" />
         </Root>
     </Loggers>
 </Configuration>

patterns/README.md

@@ -1,4 +1,4 @@
-###Relevant Articles:
+### Relevant Articles:
 - [A Guide to the Front Controller Pattern in Java](http://www.baeldung.com/java-front-controller-pattern)
 - [Introduction to Intercepting Filter Pattern in Java](http://www.baeldung.com/intercepting-filter-pattern-in-java)
 - [Implementing the Template Method Pattern in Java](http://www.baeldung.com/java-template-method-pattern)

patterns/design-patterns/README.md

@@ -10,3 +10,4 @@
 - [Composite Design Pattern in Java](http://www.baeldung.com/java-composite-pattern)
 - [Visitor Design Pattern in Java](http://www.baeldung.com/java-visitor-pattern)
 - [The DAO Pattern in Java](http://www.baeldung.com/java-dao-pattern)
+- [Interpreter Design Pattern in Java](http://www.baeldung.com/java-interpreter-pattern)

pom.xml

@@ -312,6 +312,7 @@
 				<module>core-java-collections</module>
 				<module>core-java-io</module>
 				<module>core-java-8</module>
+                <module>core-java-persistence</module>
 				<module>core-kotlin</module>
 				<module>core-groovy</module>
 				<module>core-java-concurrency</module>
@@ -858,7 +859,7 @@
 				<module>core-java-io</module>
 				<module>core-java-8</module>
 				<module>core-groovy</module>
-				<module>core-java-concurrency</module>
+				
 				<module>couchbase</module>
 				<module>deltaspike</module>
 				<module>dozer</module>
@@ -877,7 +878,7 @@
 				<module>spring-static-resources</module>
 				<module>hazelcast</module>
 				<module>hbase</module>
-				<module>httpclient</module>
+
 				<module>hystrix</module>
 				<module>image-processing</module>
 				<module>immutables</module>
@@ -906,11 +907,11 @@
 				<module>linkrest</module>
 				<module>logging-modules/log-mdc</module>
 				<module>logging-modules/log4j</module>
-				<module>logging-modules/log4j2</module>
+
 				<module>logging-modules/logback</module>
 				<module>lombok</module>
 				<module>mapstruct</module>
-				<module>metrics</module>
+
 				<module>maven</module>
 				<module>mesos-marathon</module>
 				<module>msf4j</module>
@@ -962,25 +963,25 @@
 				<module>spring-cucumber</module>
 				<module>spring-ejb</module>
 				<module>spring-aop</module>
-				<module>spring-data-couchbase-2</module>
+
 				<module>persistence-modules/spring-data-dynamodb</module>
 				<module>spring-data-keyvalue</module>
 				<module>spring-data-mongodb</module>
 				<module>persistence-modules/spring-data-neo4j</module>
-				<module>persistence-modules/spring-data-redis</module>
+
 				<module>spring-data-rest</module>
 				<module>persistence-modules/spring-data-solr</module>
 				<module>spring-dispatcher-servlet</module>
 				<module>spring-exceptions</module>
 				<module>spring-freemarker</module>
 				<module>persistence-modules/spring-hibernate-3</module>
-				<module>spring-hibernate4</module>
+
 				<module>persistence-modules/spring-hibernate-5</module>
 				<module>persistence-modules/spring-data-eclipselink</module>
 				<module>spring-integration</module>
 				<module>spring-jenkins-pipeline</module>
 				<module>spring-jersey</module>
-				<module>jmeter</module>
+
 				<module>spring-jms</module>
 				<module>spring-jooq</module>
 				<module>persistence-modules/spring-jpa</module>
@@ -1041,13 +1042,13 @@
 				<module>testing-modules/testing</module>
 				<module>testing-modules/testng</module>
 				<module>video-tutorials</module>
-				<module>xml</module>
+
 				<module>xmlunit-2</module>
 				<module>struts-2</module>
 				<module>apache-velocity</module>
 				<module>apache-solrj</module>
 				<module>rabbitmq</module>
-				<module>vertx</module>
+
 				<module>persistence-modules/spring-data-gemfire</module>
 				<module>mybatis</module>
 				<module>spring-drools</module>
@@ -1077,11 +1078,22 @@
 				<module>apache-meecrowave</module>
 				<module>testing-modules/junit-abstract</module>
                 
+                <module>spring-hibernate4</module>
+                <module>xml</module>
+                <module>vertx</module>
+                <module>metrics</module>
+                <module>httpclient</module>
+                
                 <!-- problematic -->
                 <!-- 
                 <module>ejb</module>
                 <module>persistence-modules/java-cassandra</module>
                 <module>persistence-modules/spring-data-cassandra</module>
+                <module>logging-modules/log4j2</module>
+                <module>spring-data-couchbase-2</module>
+                <module>persistence-modules/spring-data-redis</module>
+
+                <module>jmeter</module>
 				-->
                 
 				<!-- heavy -->
@@ -1097,6 +1109,7 @@
 				<module>core-java</module>
 				<module>google-web-toolkit</module>
                 <module>spring-security-mvc-custom</module>
+                <module>core-java-concurrency</module>
 				-->
                 
                 <!-- 30:32 min -->
@@ -1159,7 +1172,7 @@
                 <module>spring-security-mvc-custom</module>
                 <module>hibernate5</module>
                 <module>spring-data-elasticsearch</module>
-                 
+                <module>core-java-concurrency</module>
             </modules>
 
         </profile>
@@ -1223,6 +1236,4 @@
 		<!-- <maven-pmd-plugin.version>3.9.0</maven-pmd-plugin.version> -->
 		<maven-pmd-plugin.version>3.8</maven-pmd-plugin.version>
 	</properties>
-
-</project>
-
+</project>

rxjava/README.md

@@ -15,3 +15,4 @@
 - [RxJava Maybe](http://www.baeldung.com/rxjava-maybe)
 - [Introduction to RxRelay for RxJava](http://www.baeldung.com/rx-relay)
 - [Filtering Observables in RxJava](http://www.baeldung.com/rxjava-filtering)
+- [RxJava One Observable, Multiple Subscribers](http://www.baeldung.com/rxjava-multiple-subscribers-observable)

spring-5-reactive/README.md

@@ -5,16 +5,11 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 
 ### Relevant Articles
 
-- [Concurrent Test Execution in Spring 5](http://www.baeldung.com/spring-5-concurrent-tests)
 - [Introduction to the Functional Web Framework in Spring 5](http://www.baeldung.com/spring-5-functional-web)
-- [Exploring the Spring 5 MVC URL Matching Improvements](http://www.baeldung.com/spring-5-mvc-url-matching)
 - [Spring 5 WebClient](http://www.baeldung.com/spring-5-webclient)
-- [Spring 5 Functional Bean Registration](http://www.baeldung.com/spring-5-functional-beans)
-- [The SpringJUnitConfig and SpringJUnitWebConfig Annotations in Spring 5](http://www.baeldung.com/spring-5-junit-config)
-- [Spring Security 5 for Reactive Applications](http://www.baeldung.com/spring-security-5-reactive)
-- [Spring 5 Testing with @EnabledIf Annotation](https://github.com/eugenp/tutorials/tree/master/spring-5)
-- [Reactive WebSockets with Spring 5](http://www.baeldung.com/spring-5-reactive-websockets)
 - [Spring Boot Actuator](http://www.baeldung.com/spring-boot-actuators)
+- [Exploring the Spring 5 MVC URL Matching Improvements](http://www.baeldung.com/spring-5-mvc-url-matching)
+- [Spring Security 5 for Reactive Applications](http://www.baeldung.com/spring-security-5-reactive)
+- [Reactive WebSockets with Spring 5](http://www.baeldung.com/spring-5-reactive-websockets)
 - [Spring Webflux Filters](http://www.baeldung.com/spring-webflux-filters)
-- [Reactive Flow with MongoDB, Kotlin, and Spring WebFlux](http://www.baeldung.com/kotlin-mongodb-spring-webflux)
-- [Spring Data Reactive Repositories with MongoDB](http://www.baeldung.com/spring-data-mongodb-reactive)
+- [How to Set a Header on a Response with Spring 5](http://www.baeldung.com/spring-response-header)

spring-5-reactive/pom.xml

@@ -127,15 +127,6 @@
             <artifactId>commons-lang3</artifactId>
         </dependency>
 
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>de.flapdoodle.embed</groupId>
-            <artifactId>de.flapdoodle.embed.mongo</artifactId>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>io.reactivex.rxjava2</groupId>
             <artifactId>rxjava</artifactId>

spring-5-reactive/src/main/java/com/baeldung/functional/Actor.java

@@ -0,0 +1,23 @@
+package com.baeldung.functional;
+
+class Actor {
+    private String firstname;
+    private String lastname;
+
+    public Actor() {
+    }
+
+    public Actor(String firstname, String lastname) {
+        this.firstname = firstname;
+        this.lastname = lastname;
+    }
+
+    public String getFirstname() {
+        return firstname;
+    }
+
+    public String getLastname() {
+        return lastname;
+    }
+
+}

spring-5-reactive/src/main/java/com/baeldung/reactive/Spring5ReactiveApplication.java

@@ -1,11 +1,9 @@
 package com.baeldung.reactive;
 
-import com.mongodb.reactivestreams.client.MongoClient;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
-import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
 
 @SpringBootApplication
 public class Spring5ReactiveApplication{
@@ -14,12 +12,4 @@ public class Spring5ReactiveApplication{
         SpringApplication.run(Spring5ReactiveApplication.class, args);
     }
 
-    @Autowired
-    MongoClient mongoClient;
-
-    @Bean
-    public ReactiveMongoTemplate reactiveMongoTemplate() {
-        return new ReactiveMongoTemplate(mongoClient, "test");
-    }
-
 }

spring-5-reactive/src/main/java/com/baeldung/reactive/SpringSecurity5Application.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.reactive;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;

spring-5-reactive/src/main/java/com/baeldung/reactive/actuator/WebSecurityConfig.java

@@ -0,0 +1,28 @@
+package com.baeldung.reactive.actuator;
+
+import org.springframework.boot.actuate.autoconfigure.security.reactive.EndpointRequest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
+import org.springframework.security.config.web.server.ServerHttpSecurity;
+import org.springframework.security.web.server.SecurityWebFilterChain;
+
+@Configuration
+@EnableWebFluxSecurity
+public class WebSecurityConfig {
+ 
+    
+    @Bean
+    public SecurityWebFilterChain securitygWebFilterChain(
+      ServerHttpSecurity http) {
+        return  http
+     
+            .authorizeExchange()
+                .matchers(EndpointRequest.to(
+                       FeaturesEndpoint.class
+                )).permitAll().and().csrf().disable().build();
+    }
+    
+}

spring-5-reactive/src/main/java/com/baeldung/reactive/cors/annotated/CorsOnAnnotatedElementsApplication.java

@@ -4,16 +4,8 @@ import java.util.Collections;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration;
-import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
-import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
-import org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration;
 
-@SpringBootApplication(exclude = { MongoAutoConfiguration.class,
-        MongoDataAutoConfiguration.class,
-        MongoReactiveDataAutoConfiguration.class,
-        MongoReactiveAutoConfiguration.class }
-)
+@SpringBootApplication
 public class CorsOnAnnotatedElementsApplication {
 
     public static void main(String[] args) {

spring-5-reactive/src/main/java/com/baeldung/reactive/cors/webfilter/controllers/FurtherCorsConfigsController.java

@@ -8,8 +8,8 @@ import org.springframework.web.bind.annotation.RestController;
 
 import reactor.core.publisher.Mono;
 
-@RestController
-@RequestMapping("/web-filter-and-more-on-annotated")
+//@RestController
+//@RequestMapping("/web-filter-and-more-on-annotated")
 public class FurtherCorsConfigsController {
 
     @DeleteMapping("/further-mixed-config-endpoint")

spring-5-reactive/src/main/java/com/baeldung/reactive/cors/webfilter/controllers/RegularRestController.java

@@ -7,8 +7,8 @@ import org.springframework.web.bind.annotation.RestController;
 
 import reactor.core.publisher.Mono;
 
-@RestController
-@RequestMapping("/web-filter-on-annotated")
+//@RestController
+//@RequestMapping("/web-filter-on-annotated")
 public class RegularRestController {
 
     @PutMapping("/regular-put-endpoint")

spring-5-reactive/src/main/java/com/baeldung/reactive/security/GreetController.java

@@ -1,4 +1,4 @@
-package com.baeldung.security;
+package com.baeldung.reactive.security;
 
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;

spring-5-reactive/src/main/java/com/baeldung/reactive/security/GreetService.java

@@ -1,4 +1,4 @@
-package com.baeldung.security;
+package com.baeldung.reactive.security;
 
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.stereotype.Service;

spring-5-reactive/src/main/java/com/baeldung/reactive/security/SecurityConfig.java

@@ -1,5 +1,6 @@
-package com.baeldung.security;
+package com.baeldung.reactive.security;
 
+import org.springframework.boot.actuate.autoconfigure.security.reactive.EndpointRequest;
 import org.springframework.context.annotation.Bean;
 import org.springframework.security.config.annotation.method.configuration.EnableReactiveMethodSecurity;
 import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
@@ -9,6 +10,8 @@ import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.web.server.SecurityWebFilterChain;
 
+import com.baeldung.reactive.actuator.FeaturesEndpoint;
+
 @EnableWebFluxSecurity
 @EnableReactiveMethodSecurity
 public class SecurityConfig {
@@ -16,25 +19,33 @@ public class SecurityConfig {
     @Bean
     public SecurityWebFilterChain securitygWebFilterChain(ServerHttpSecurity http) {
         return http.authorizeExchange()
-                .pathMatchers("/admin").hasAuthority("ROLE_ADMIN")
-                .anyExchange().authenticated()
-                .and().formLogin()
-                .and().build();
+            .pathMatchers("/admin")
+            .hasAuthority("ROLE_ADMIN")
+            .matchers(EndpointRequest.to(FeaturesEndpoint.class))
+            .permitAll()
+            .anyExchange()
+            .permitAll()
+            .and()
+            .formLogin()
+            .and()
+            .csrf()
+            .disable()
+            .build();
     }
 
     @Bean
     public MapReactiveUserDetailsService userDetailsService() {
         UserDetails user = User.withDefaultPasswordEncoder()
-                .username("user")
-                .password("password")
-                .roles("USER")
-                .build();
+            .username("user")
+            .password("password")
+            .roles("USER")
+            .build();
 
         UserDetails admin = User.withDefaultPasswordEncoder()
-                .username("admin")
-                .password("password")
-                .roles("ADMIN")
-                .build();
+            .username("admin")
+            .password("password")
+            .roles("ADMIN")
+            .build();
 
         return new MapReactiveUserDetailsService(user, admin);
     }

spring-5-reactive/src/main/java/com/baeldung/websocket/Event.java

@@ -1,4 +1,4 @@
-package com.baeldung.reactive.websocket;
+package com.baeldung.websocket;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;

spring-5-reactive/src/main/java/com/baeldung/websocket/ReactiveJavaClientWebSocket.java

@@ -1,4 +1,4 @@
-package com.baeldung.reactive.websocket;
+package com.baeldung.websocket;
 
 import java.net.URI;
 import java.time.Duration;

spring-5-reactive/src/main/java/com/baeldung/websocket/ReactiveWebSocketApplication.java

@@ -1,4 +1,4 @@
-package com.baeldung.reactive.websocket;
+package com.baeldung.websocket;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;

spring-5-reactive/src/main/java/com/baeldung/websocket/ReactiveWebSocketConfiguration.java

@@ -1,4 +1,4 @@
-package com.baeldung.reactive.websocket;
+package com.baeldung.websocket;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;

spring-5-reactive/src/main/java/com/baeldung/websocket/ReactiveWebSocketHandler.java

@@ -1,4 +1,4 @@
-package com.baeldung.reactive.websocket;
+package com.baeldung.websocket;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;

spring-5-reactive/src/test/java/com/baeldung/reactive/Spring5ReactiveServerClientIntegrationTest.java

@@ -1,6 +1,5 @@
-package com.baeldung.jupiter;
+package com.baeldung.reactive;
 
-import com.baeldung.web.reactive.Task;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.springframework.http.server.reactive.HttpHandler;
@@ -8,6 +7,9 @@ import org.springframework.http.server.reactive.ReactorHttpHandlerAdapter;
 import org.springframework.web.reactive.function.server.RouterFunction;
 import org.springframework.web.reactive.function.server.RouterFunctions;
 import org.springframework.web.reactive.function.server.ServerResponse;
+
+import com.baeldung.web.reactive.Task;
+
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.ipc.netty.NettyContext;

spring-5-reactive/src/test/java/com/baeldung/reactive/webflux/EmployeeControllerIntegrationTest.java

@@ -15,13 +15,15 @@ import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.reactive.server.WebTestClient;
 
+import com.baeldung.reactive.Spring5ReactiveApplication;
+
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
 @RunWith(SpringRunner.class)
-@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes=Spring5ReactiveApplication.class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
-public class EmployeeControllerUnitTest {
+public class EmployeeControllerIntegrationTest {
 
     @Autowired
     private WebTestClient testClient;

spring-5-reactive/src/test/java/com/baeldung/security/SecurityIntegrationTest.java

@@ -1,6 +1,6 @@
 package com.baeldung.security;
 
-import com.baeldung.SpringSecurity5Application;
+import com.baeldung.reactive.SpringSecurity5Application;
 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;

spring-5-reactive/src/test/java/com/baeldung/web/client/WebTestClientIntegrationTest.java

@@ -1,11 +1,10 @@
 package com.baeldung.web.client;
 
-import com.baeldung.Spring5Application;
+import com.baeldung.reactive.Spring5ReactiveApplication;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.web.server.LocalServerPort;
-import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.web.reactive.function.server.RequestPredicates;
@@ -16,8 +15,7 @@ import org.springframework.web.server.WebHandler;
 import reactor.core.publisher.Mono;
 
 @RunWith(SpringRunner.class)
-@SpringBootTest(classes = Spring5Application.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-@EnableJpaRepositories("com.baeldung.persistence")
+@SpringBootTest(classes = Spring5ReactiveApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
 public class WebTestClientIntegrationTest {
 
     @LocalServerPort

spring-5/README.md

@@ -6,14 +6,9 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 ### Relevant Articles
 
 - [Concurrent Test Execution in Spring 5](http://www.baeldung.com/spring-5-concurrent-tests)
-- [Introduction to the Functional Web Framework in Spring 5](http://www.baeldung.com/spring-5-functional-web)
-- [Exploring the Spring 5 MVC URL Matching Improvements](http://www.baeldung.com/spring-5-mvc-url-matching)
-- [Spring 5 WebClient](http://www.baeldung.com/spring-5-webclient)
 - [Spring 5 Functional Bean Registration](http://www.baeldung.com/spring-5-functional-beans)
 - [The SpringJUnitConfig and SpringJUnitWebConfig Annotations in Spring 5](http://www.baeldung.com/spring-5-junit-config)
-- [Spring Security 5 for Reactive Applications](http://www.baeldung.com/spring-security-5-reactive)
 - [Spring 5 Testing with @EnabledIf Annotation](http://www.baeldung.com/spring-5-enabledIf)
 - [Introduction to Spring REST Docs](http://www.baeldung.com/spring-rest-docs)
-- [Spring Security 5 – OAuth2 Login](http://www.baeldung.com/spring-security-5-oauth2-login)
 - [Spring ResponseStatusException](http://www.baeldung.com/spring-response-status-exception)
 - [Spring Assert Statements](http://www.baeldung.com/spring-assert)

spring-5/pom.xml

@@ -33,19 +33,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-webflux</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-hateoas</artifactId>
         </dependency>
-        <dependency>
-            <groupId>org.projectreactor</groupId>
-            <artifactId>reactor-spring</artifactId>
-            <version>${reactor-spring.version}</version>
-        </dependency>
         <dependency>
             <groupId>javax.json.bind</groupId>
             <artifactId>javax.json.bind-api</artifactId>
@@ -139,11 +130,6 @@
             <artifactId>spring-restdocs-mockmvc</artifactId>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.restdocs</groupId>
-            <artifactId>spring-restdocs-webtestclient</artifactId>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.springframework.restdocs</groupId>
             <artifactId>spring-restdocs-restassured</artifactId>

spring-5/src/main/java/com/baeldung/Spring5Application.java

@@ -2,10 +2,8 @@ package com.baeldung;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.context.annotation.ComponentScan;
 
 @SpringBootApplication
-@ComponentScan(basePackages = { "com.baeldung.web" })
 public class Spring5Application {
 
     public static void main(String[] args) {

spring-5/src/main/java/com/baeldung/config/PersistenceConfig.java

@@ -0,0 +1,12 @@
+package com.baeldung.config;
+
+import org.springframework.boot.autoconfigure.domain.EntityScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+
+@Configuration
+@EnableJpaRepositories("com.baeldung.persistence")
+@EntityScan("com.baeldung.web")
+public class PersistenceConfig {
+
+}

spring-5/src/main/java/com/baeldung/exception/ActorController.java

@@ -1,4 +1,4 @@
-package com.baeldung.execption;
+package com.baeldung.exception;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;

spring-5/src/main/java/com/baeldung/exception/ActorNotFoundException.java

@@ -1,4 +1,4 @@
-package com.baeldung.execption;
+package com.baeldung.exception;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.ResponseStatus;

spring-5/src/main/java/com/baeldung/exception/ActorService.java

@@ -1,4 +1,4 @@
-package com.baeldung.execption;
+package com.baeldung.exception;
 
 import java.util.Arrays;
 import java.util.List;

spring-5/src/main/java/com/baeldung/exception/SpringExceptionApplication.java

@@ -1,14 +1,14 @@
-package com.baeldung.execption;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
-import org.springframework.context.annotation.ComponentScan;
-
-@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
-@ComponentScan(basePackages = { "com.baeldung.execption" })
-public class SpringExceptionApplication {
-    public static void main(String[] args) {
-        SpringApplication.run(SpringExceptionApplication.class, args);
-    }
+package com.baeldung.exception;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
+@ComponentScan(basePackages = { "com.baeldung.execption" })
+public class SpringExceptionApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(SpringExceptionApplication.class, args);
+    }
 }

spring-5/src/main/java/com/baeldung/jupiter/Task.java

@@ -0,0 +1,28 @@
+package com.baeldung.jupiter;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class Task {
+
+    private final String name;
+
+    private final int id;
+
+    public Task(@JsonProperty("name") String name, @JsonProperty("id") int id) {
+        this.name = name;
+        this.id = id;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public int getId() {
+        return this.id;
+    }
+
+    @Override
+    public String toString() {
+        return "Task{" + "name='" + name + '\'' + ", id=" + id + '}';
+    }
+}

spring-5/src/main/java/com/baeldung/jupiter/TestConfig.java

@@ -1,6 +1,5 @@
 package com.baeldung.jupiter;
 
-import com.baeldung.web.reactive.Task;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;

spring-5/src/test/java/com/baeldung/jdbc/autogenkey/GetAutoGenKeyByJDBCIntTest.java

@@ -1,55 +1,55 @@
-package com.baeldung.jdbc.autogenkey;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import org.junit.Ignore;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
-import org.springframework.context.annotation.ComponentScan;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.PropertySource;
-import org.springframework.test.context.junit4.SpringRunner;
-
-import com.baeldung.jdbc.autogenkey.repository.MessageRepositoryJDBCTemplate;
-import com.baeldung.jdbc.autogenkey.repository.MessageRepositorySimpleJDBCInsert;
-
-@RunWith(SpringRunner.class)
-@Ignore
-public class GetAutoGenKeyByJDBC {
-
-    @Configuration
-    @EnableAutoConfiguration
-    @PropertySource("classpath:autogenkey-db.properties")
-    @ComponentScan(basePackages = { "com.baeldung.jdbc.autogenkey.repository" })
-    public static class SpringConfig {
-
-    }
-
-    @Autowired
-    MessageRepositorySimpleJDBCInsert messageRepositorySimpleJDBCInsert;
-
-    @Autowired
-    MessageRepositoryJDBCTemplate messageRepositoryJDBCTemplate;
-
-    final String MESSAGE_CONTENT = "Test";
-
-    @Test
-    public void insertJDBC_whenLoadMessageByKey_thenGetTheSameMessage() {
-        long key = messageRepositoryJDBCTemplate.insert(MESSAGE_CONTENT);
-        String loadedMessage = messageRepositoryJDBCTemplate.getMessageById(key);
-
-        assertEquals(MESSAGE_CONTENT, loadedMessage);
-
-    }
-
-    @Test
-    public void insertSimpleInsert_whenLoadMessageKey_thenGetTheSameMessage() {
-        long key = messageRepositorySimpleJDBCInsert.insert(MESSAGE_CONTENT);
-        String loadedMessage = messageRepositoryJDBCTemplate.getMessageById(key);
-
-        assertEquals(MESSAGE_CONTENT, loadedMessage);
-    }
-
-}
+package com.baeldung.jdbc.autogenkey;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.jdbc.autogenkey.repository.MessageRepositoryJDBCTemplate;
+import com.baeldung.jdbc.autogenkey.repository.MessageRepositorySimpleJDBCInsert;
+
+@RunWith(SpringRunner.class)
+@Ignore
+public class GetAutoGenKeyByJDBCIntTest {
+
+    @Configuration
+    @EnableAutoConfiguration
+    @PropertySource("classpath:autogenkey-db.properties")
+    @ComponentScan(basePackages = { "com.baeldung.jdbc.autogenkey.repository" })
+    public static class SpringConfig {
+
+    }
+
+    @Autowired
+    MessageRepositorySimpleJDBCInsert messageRepositorySimpleJDBCInsert;
+
+    @Autowired
+    MessageRepositoryJDBCTemplate messageRepositoryJDBCTemplate;
+
+    final String MESSAGE_CONTENT = "Test";
+
+    @Test
+    public void insertJDBC_whenLoadMessageByKey_thenGetTheSameMessage() {
+        long key = messageRepositoryJDBCTemplate.insert(MESSAGE_CONTENT);
+        String loadedMessage = messageRepositoryJDBCTemplate.getMessageById(key);
+
+        assertEquals(MESSAGE_CONTENT, loadedMessage);
+
+    }
+
+    @Test
+    public void insertSimpleInsert_whenLoadMessageKey_thenGetTheSameMessage() {
+        long key = messageRepositorySimpleJDBCInsert.insert(MESSAGE_CONTENT);
+        String loadedMessage = messageRepositoryJDBCTemplate.getMessageById(key);
+
+        assertEquals(MESSAGE_CONTENT, loadedMessage);
+    }
+
+}

spring-5/src/test/java/com/baeldung/jupiter/Spring5JUnit5ComposedAnnotationIntegrationTest.java

@@ -1,6 +1,5 @@
 package com.baeldung.jupiter;
 
-import com.baeldung.web.reactive.Task;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;

spring-5/src/test/java/com/baeldung/jupiter/Spring5JUnit5IntegrationTest.java

@@ -1,6 +1,5 @@
 package com.baeldung.jupiter;
 
-import com.baeldung.web.reactive.Task;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;

spring-all/src/main/java/org/baeldung/primary/Config.java

@@ -0,0 +1,22 @@
+package org.baeldung.primary;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+
+@Configuration
+@ComponentScan(basePackages="org.baeldung.primary")
+public class Config {
+
+    @Bean
+    public Employee JohnEmployee(){
+        return new Employee("John");
+    }
+
+    @Bean
+    @Primary
+    public Employee TonyEmployee(){
+        return new Employee("Tony");
+    }
+}

spring-all/src/main/java/org/baeldung/primary/DepartmentManager.java

@@ -0,0 +1,11 @@
+package org.baeldung.primary;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class DepartmentManager implements Manager {
+    @Override
+    public String getManagerName() {
+        return "Department manager";
+    }
+}

spring-all/src/main/java/org/baeldung/primary/Employee.java

@@ -0,0 +1,20 @@
+package org.baeldung.primary;
+
+/**
+ * Created by Gebruiker on 7/17/2018.
+ */
+public class Employee {
+
+    private String name;
+
+    public Employee(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee{" +
+                "name='" + name + '\'' +
+                '}';
+    }
+}

spring-all/src/main/java/org/baeldung/primary/GeneralManager.java

@@ -0,0 +1,14 @@
+package org.baeldung.primary;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+
+@Component
+@Primary
+public class GeneralManager implements Manager {
+
+    @Override
+    public String getManagerName() {
+        return "General manager";
+    }
+}

spring-all/src/main/java/org/baeldung/primary/Manager.java

@@ -0,0 +1,8 @@
+package org.baeldung.primary;
+
+/**
+ * Created by Gebruiker on 7/19/2018.
+ */
+public interface Manager {
+    String getManagerName();
+}

spring-all/src/main/java/org/baeldung/primary/ManagerService.java

@@ -0,0 +1,17 @@
+package org.baeldung.primary;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * Created by Gebruiker on 7/19/2018.
+ */@Service
+public class ManagerService {
+
+    @Autowired
+    private Manager manager;
+
+    public Manager getManager() {
+        return manager;
+    }
+}

spring-all/src/main/java/org/baeldung/primary/PrimaryApplication.java

@@ -0,0 +1,20 @@
+package org.baeldung.primary;
+
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+
+public class PrimaryApplication {
+
+    public static void main(String[] args) {
+        AnnotationConfigApplicationContext context
+                = new AnnotationConfigApplicationContext(Config.class);
+
+        Employee employee = context.getBean(Employee.class);
+        System.out.println(employee);
+
+        ManagerService service = context.getBean(ManagerService.class);
+        Manager manager = service.getManager();
+        System.out.println(manager.getManagerName());
+    }
+    
+}

spring-boot-ops/README.md

@@ -1,4 +1,11 @@
-### Relevant Articles: 
-================================
-
-- [Spring Boot Console Application](http://www.baeldung.com/spring-boot-console-app)
+### Relevant Articles:			
+ - [Deploy a Spring Boot WAR into a Tomcat Server](http://www.baeldung.com/spring-boot-war-tomcat-deploy)		
+ - [Spring Boot Dependency Management with a Custom Parent](http://www.baeldung.com/spring-boot-dependency-management-custom-parent)		
+ - [A Custom Data Binder in Spring MVC](http://www.baeldung.com/spring-mvc-custom-data-binder)		
+ - [Create a Fat Jar App with Spring Boot](http://www.baeldung.com/deployable-fat-jar-spring-boot)		
+ - [Introduction to WebJars](http://www.baeldung.com/maven-webjars)		
+ - [Intro to Spring Boot Starters](http://www.baeldung.com/spring-boot-starters)		
+ - [A Quick Guide to Maven Wrapper](http://www.baeldung.com/maven-wrapper)		
+ - [Shutdown a Spring Boot Application](http://www.baeldung.com/spring-boot-shutdown)
+ - [Spring Boot Console Application](http://www.baeldung.com/spring-boot-console-app)
+ 

spring-boot/README.MD

@@ -34,3 +34,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Spring Boot Exit Codes](http://www.baeldung.com/spring-boot-exit-codes)
 - [Guide to the Favicon in Spring Boot](http://www.baeldung.com/spring-boot-favicon)
 - [Spring Shutdown Callbacks](http://www.baeldung.com/spring-shutdown-callbacks)
+- [Spring Boot Integration Testing with Embedded MongoDB](http://www.baeldung.com/spring-boot-embedded-mongodb)

spring-data-5-reactive/README.md

@@ -0,0 +1,8 @@
+## Spring Data Reactive Project
+
+### The Course
+The "REST With Spring" Classes: http://bit.ly/restwithspring
+
+### Relevant Articles
+- [Reactive Flow with MongoDB, Kotlin, and Spring WebFlux](http://www.baeldung.com/kotlin-mongodb-spring-webflux)
+- [Spring Data Reactive Repositories with MongoDB](http://www.baeldung.com/spring-data-mongodb-reactive)

spring-data-5-reactive/pom.xml

@@ -23,11 +23,6 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
-        <dependency>
-            <groupId>javax.ws.rs</groupId>
-            <artifactId>javax.ws.rs-api</artifactId>
-            <version>${javax.ws.rs-api.version}</version>
-        </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.module</groupId>
             <artifactId>jackson-module-kotlin</artifactId>
@@ -54,34 +49,51 @@
             <artifactId>kotlin-stdlib-jdk8</artifactId>
             <version>${kotlin.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.jetbrains.kotlin</groupId>
-            <artifactId>kotlin-stdlib-jdk8</artifactId>
-            <version>${kotlin.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
             <artifactId>kotlin-test</artifactId>
             <version>${kotlin.version}</version>
             <scope>test</scope>
         </dependency>
+         <dependency>
+            <groupId>io.reactivex.rxjava2</groupId>
+            <artifactId>rxjava</artifactId>
+        </dependency>
+        
         <dependency>
-            <groupId>org.jetbrains.kotlin</groupId>
-            <artifactId>kotlin-stdlib-jdk8</artifactId>
-            <version>${kotlin.version}</version>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        
+         <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-surefire-provider</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
         </dependency>
     </dependencies>
 
-    <repositories>
-        <repository>
-            <id>spring-libs-snapshot</id>
-            <name>Spring Snapshot Repository</name>
-            <url>http://repo.spring.io/libs-snapshot</url>
-        </repository>
-    </repositories>
-
     <build>
-        <sourceDirectory>src/main/kotlin</sourceDirectory>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
@@ -89,21 +101,30 @@
             </plugin>
             <plugin>
                 <artifactId>kotlin-maven-plugin</artifactId>
-                <version>${kotlin.version}</version>
-                <executions>
+               <executions>
                     <execution>
                         <id>compile</id>
-                        <phase>compile</phase>
                         <goals>
                             <goal>compile</goal>
                         </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
+                                <sourceDir>${project.basedir}/src/main/java</sourceDir>
+                            </sourceDirs>
+                        </configuration>
                     </execution>
                     <execution>
                         <id>test-compile</id>
-                        <phase>test-compile</phase>
                         <goals>
                             <goal>test-compile</goal>
                         </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
+                                <sourceDir>${project.basedir}/src/test/java</sourceDir>
+                            </sourceDirs>
+                        </configuration>
                     </execution>
                 </executions>
                 <groupId>org.jetbrains.kotlin</groupId>
@@ -124,6 +145,57 @@
                     </dependency>
                 </dependencies>
             </plugin>
+             <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                </configuration>
+                <executions>
+                    <!-- Replacing default-compile as it is treated specially 
+                        by maven -->
+                    <execution>
+                        <id>default-compile</id>
+                        <phase>none</phase>
+                    </execution>
+                    <!-- Replacing default-testCompile as it is treated specially 
+                        by maven -->
+                    <execution>
+                        <id>default-testCompile</id>
+                        <phase>none</phase>
+                    </execution>
+                    <execution>
+                        <id>java-compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>java-test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>testCompile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <forkCount>3</forkCount>
+                    <reuseForks>true</reuseForks>
+                    <parallel>methods</parallel>
+                    <useUnlimitedThreads>true</useUnlimitedThreads>
+                    <excludes>
+                        <exclude>**/*IntegrationTest.java</exclude>
+                        <exclude>**/*IntTest.java</exclude>
+                        <exclude>**/*LiveTest.java</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -132,6 +204,8 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
         <kotlin.version>1.2.40</kotlin.version>
+        <junit.platform.version>1.0.0</junit.platform.version>
+        <junit.jupiter.version>5.0.2</junit.jupiter.version>
     </properties>
 
 </project>

spring-data-5-reactive/src/main/java/com/baeldung/reactive/Spring5ReactiveApplication.java

@@ -0,0 +1,25 @@
+package com.baeldung.reactive;
+
+import com.mongodb.reactivestreams.client.MongoClient;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
+
+@SpringBootApplication
+public class Spring5ReactiveApplication{
+
+    public static void main(String[] args) {
+        SpringApplication.run(Spring5ReactiveApplication.class, args);
+    }
+
+    @Autowired
+    MongoClient mongoClient;
+
+    @Bean
+    public ReactiveMongoTemplate reactiveMongoTemplate() {
+        return new ReactiveMongoTemplate(mongoClient, "test");
+    }
+
+}

spring-data-5-reactive/src/main/kotlin/com/baeldung/EventRepository.kt

@@ -4,6 +4,3 @@ import org.springframework.data.mongodb.core.mapping.Document
 import org.springframework.data.mongodb.repository.ReactiveMongoRepository
 
 interface EventRepository : ReactiveMongoRepository<Event, String>
-
-@Document
-data class Event(val id: String, val name: String)