Merge branch 'eugenp:master' into master

core-java-modules/core-java-17/README.md

@@ -9,3 +9,4 @@
 - [Migrate From Java 8 to Java 17](https://www.baeldung.com/java-migrate-8-to-17)
 - [Format Multiple ‘or’ Conditions in an If Statement in Java](https://www.baeldung.com/java-multiple-or-conditions-if-statement)
 - [Get All Record Fields and Its Values via Reflection](https://www.baeldung.com/java-reflection-record-fields-values)
+- [Context-Specific Deserialization Filters in Java 17](https://www.baeldung.com/java-context-specific-deserialization-filters)

core-java-modules/core-java-collections-5/README.md

@@ -10,4 +10,5 @@
 - [Remove Elements From a Queue Using Loop](https://www.baeldung.com/java-remove-elements-queue)
 - [Intro to Vector Class in Java](https://www.baeldung.com/java-vector-guide)
 - [HashSet toArray() Method in Java](https://www.baeldung.com/java-hashset-toarray)
+- [Time Complexity of Java Collections Sort in Java](https://www.baeldung.com/java-time-complexity-collections-sort)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-4)

core-java-modules/core-java-collections-maps-7/README.md

@@ -4,4 +4,5 @@
 - [How to Write Hashmap to CSV File](https://www.baeldung.com/java-write-hashmap-csv)
 - [How to Get First or Last Entry From a LinkedHashMap in Java](https://www.baeldung.com/java-linkedhashmap-first-last-key-value-pair)
 - [How to Write and Read a File with a Java HashMap](https://www.baeldung.com/java-hashmap-write-read-file)
+- [Limiting the Max Size of a HashMap in Java](https://www.baeldung.com/java-hashmap-max-size)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-maps-6)

core-java-modules/core-java-collections-maps-7/src/main/java/com/baeldung/map/HashMapWithMaxSizeLimit.java

@@ -0,0 +1,25 @@
+package com.baeldung.map;
+
+import java.util.HashMap;
+
+public class HashMapWithMaxSizeLimit<K, V> extends HashMap<K, V> {
+    private int maxSize = -1;
+    
+    public HashMapWithMaxSizeLimit() {
+        super();
+    }
+
+    public HashMapWithMaxSizeLimit(int maxSize) {
+        super();
+        this.maxSize = maxSize;
+    }
+
+    @Override
+    public V put(K key, V value) {
+        if (this.maxSize == -1 || this.containsKey(key) || this.size() < this.maxSize) {
+            return super.put(key, value);
+        }
+        throw new RuntimeException("Max size exceeded!");
+    }
+
+}

core-java-modules/core-java-collections-maps-7/src/test/java/com/baeldung/map/LimitMaxSizeHashMapByCustomHashMapUnitTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.map;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+class LimitMaxSizeHashMapByCustomHashMapUnitTest {
+
+    private final int MAX_SIZE = 4;
+    private HashMapWithMaxSizeLimit<Integer, String> hashMapWithMaxSizeLimit;
+
+    @Test
+    void givenCustomHashMapObject_whenThereIsNoLimit_thenDoesNotThrowException() {
+        hashMapWithMaxSizeLimit = new HashMapWithMaxSizeLimit<Integer, String>();
+        assertDoesNotThrow(() -> {
+            for (int i = 0; i < 10000; i++) {
+                hashMapWithMaxSizeLimit.put(i, i + "");
+            }
+        });
+    }
+
+    @Test
+    void givenCustomHashMapObject_whenLimitNotReached_thenDoesNotThrowException() {
+        hashMapWithMaxSizeLimit = new HashMapWithMaxSizeLimit<Integer, String>(MAX_SIZE);
+        assertDoesNotThrow(() -> {
+            for (int i = 0; i < 4; i++) {
+                hashMapWithMaxSizeLimit.put(i, i + "");
+            }
+        });
+    }
+
+    @Test
+    void givenCustomHashMapObject_whenReplacingValueWhenLimitIsReached_thenDoesNotThrowException() {
+        hashMapWithMaxSizeLimit = new HashMapWithMaxSizeLimit<Integer, String>(MAX_SIZE);
+        assertDoesNotThrow(() -> {
+            hashMapWithMaxSizeLimit.put(1, "One");
+            hashMapWithMaxSizeLimit.put(2, "Two");
+            hashMapWithMaxSizeLimit.put(3, "Three");
+            hashMapWithMaxSizeLimit.put(4, "Four");
+            hashMapWithMaxSizeLimit.put(4, "4");
+        });
+    }
+
+    @Test
+    void givenCustomHashMapObject_whenLimitExceeded_thenThrowsException() {
+        hashMapWithMaxSizeLimit = new HashMapWithMaxSizeLimit<Integer, String>(MAX_SIZE);
+        Exception exception = assertThrows(RuntimeException.class, () -> {
+            for (int i = 0; i < 5; i++) {
+                hashMapWithMaxSizeLimit.put(i, i + "");
+            }
+        });
+
+        String messageThrownWhenSizeExceedsLimit = "Max size exceeded!";
+        String actualMessage = exception.getMessage();
+        assertTrue(actualMessage.equals(messageThrownWhenSizeExceedsLimit));
+    }
+
+}

core-java-modules/core-java-collections-maps-7/src/test/java/com/baeldung/map/LimitMaxSizeHashMapByLinkedHashMapUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.map;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+class LimitMaxSizeHashMapByLinkedHashMapUnitTest {
+
+    @Test
+    void givenLinkedHashMapObject_whenAddingNewEntry_thenEldestEntryIsRemoved() {
+        final int MAX_SIZE = 4;
+        LinkedHashMap<Integer, String> linkedHashMap;
+        linkedHashMap = new LinkedHashMap<Integer, String>() {
+            private static final long serialVersionUID = 1L;
+            
+            @Override
+            protected boolean removeEldestEntry(Map.Entry<Integer, String> eldest) {
+                return size() > MAX_SIZE;
+            }
+        };
+        linkedHashMap.put(1, "One");
+        linkedHashMap.put(2, "Two");
+        linkedHashMap.put(3, "Three");
+        linkedHashMap.put(4, "Four");
+        linkedHashMap.put(5, "Five");
+        String[] expectedArrayAfterFive = { "Two", "Three", "Four", "Five" };
+        assertArrayEquals(expectedArrayAfterFive, linkedHashMap.values()
+            .toArray());
+        linkedHashMap.put(6, "Six");
+        String[] expectedArrayAfterSix = { "Three", "Four", "Five", "Six" };
+        assertArrayEquals(expectedArrayAfterSix, linkedHashMap.values()
+            .toArray());
+    }
+
+}

core-java-modules/core-java-collections-maps-7/src/test/java/com/baeldung/map/LinkedHashMapSortByValueUnitTest.java

@@ -0,0 +1,141 @@
+package com.baeldung.map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+import org.junit.jupiter.api.Test;
+
+class Player {
+    private String name;
+    private Integer score = 0;
+
+    public Player(String name, Integer score) {
+        this.name = name;
+        this.score = score;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof Player)) {
+            return false;
+        }
+
+        Player player = (Player) o;
+
+        if (!Objects.equals(name, player.name)) {
+            return false;
+        }
+        return Objects.equals(score, player.score);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = name != null ? name.hashCode() : 0;
+        result = 31 * result + (score != null ? score.hashCode() : 0);
+        return result;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getScore() {
+        return score;
+    }
+}
+
+public class LinkedHashMapSortByValueUnitTest {
+    private static LinkedHashMap<String, Integer> MY_MAP = new LinkedHashMap<>();
+
+    static {
+        MY_MAP.put("key a", 4);
+        MY_MAP.put("key b", 1);
+        MY_MAP.put("key c", 3);
+        MY_MAP.put("key d", 2);
+        MY_MAP.put("key e", 5);
+    }
+
+    private static LinkedHashMap<String, Integer> EXPECTED_MY_MAP = new LinkedHashMap<>();
+
+    static {
+        EXPECTED_MY_MAP.put("key b", 1);
+        EXPECTED_MY_MAP.put("key d", 2);
+        EXPECTED_MY_MAP.put("key c", 3);
+        EXPECTED_MY_MAP.put("key a", 4);
+        EXPECTED_MY_MAP.put("key e", 5);
+    }
+
+    private static final LinkedHashMap<String, Player> PLAYERS = new LinkedHashMap<>();
+    static {
+        PLAYERS.put("player a", new Player("Eric", 9));
+        PLAYERS.put("player b", new Player("Kai", 7));
+        PLAYERS.put("player c", new Player("Amanda", 20));
+        PLAYERS.put("player d", new Player("Kevin", 4));
+    }
+
+    private static final LinkedHashMap<String, Player> EXPECTED_PLAYERS = new LinkedHashMap<>();
+
+    static {
+        EXPECTED_PLAYERS.put("player d", new Player("Kevin", 4));
+        EXPECTED_PLAYERS.put("player b", new Player("Kai", 7));
+        EXPECTED_PLAYERS.put("player a", new Player("Eric", 9));
+        EXPECTED_PLAYERS.put("player c", new Player("Amanda", 20));
+    }
+
+    @Test
+    void whenUsingCollectionSort_thenGetExpectedResult() {
+        List<Map.Entry<String, Integer>> entryList = new ArrayList<>(MY_MAP.entrySet());
+        Collections.sort(entryList, new Comparator<Map.Entry<String, Integer>>() {
+            @Override
+            public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
+                return o1.getValue()
+                  .compareTo(o2.getValue());
+            }
+        });
+
+        LinkedHashMap<String, Integer> result = new LinkedHashMap<>();
+        for (Map.Entry<String, Integer> e : entryList) {
+            result.put(e.getKey(), e.getValue());
+        }
+        assertEquals(EXPECTED_MY_MAP, result);
+    }
+
+    @Test
+    void whenUsingEntrycomparingByValueAndFillAMap_thenGetExpectedResult() {
+        LinkedHashMap<String, Integer> result = new LinkedHashMap<>();
+        MY_MAP.entrySet()
+          .stream()
+          .sorted(Map.Entry.comparingByValue())
+          .forEachOrdered(entry -> result.put(entry.getKey(), entry.getValue()));
+        assertEquals(EXPECTED_MY_MAP, result);
+    }
+
+    @Test
+    void whenUsingEntrycomparingByValueAndCollect_thenGetExpectedResult() {
+        LinkedHashMap<String, Integer> result = MY_MAP.entrySet()
+          .stream()
+          .sorted(Map.Entry.comparingByValue())
+          .collect(LinkedHashMap::new, (map, entry) -> map.put(entry.getKey(), entry.getValue()), Map::putAll);
+        assertEquals(EXPECTED_MY_MAP, result);
+    }
+
+    @Test
+    void whenUsingEntrycomparingByValueAndComparator_thenGetExpectedResult() {
+        LinkedHashMap<String, Player> result = PLAYERS.entrySet()
+          .stream()
+          .sorted(Map.Entry.comparingByValue(Comparator.comparing(Player::getScore)))
+          .collect(LinkedHashMap::new, (map, entry) -> map.put(entry.getKey(), entry.getValue()), Map::putAll);
+        assertEquals(EXPECTED_PLAYERS, result);
+    }
+
+}

core-java-modules/core-java-concurrency-advanced-5/README.md

@@ -1,3 +1,4 @@
 
 ### Relevant Articles:
 - [Why wait() Requires Synchronization?](https://www.baeldung.com/java-wait-necessary-synchronization)
+- [Working with Exceptions in Java CompletableFuture](https://www.baeldung.com/java-exceptions-completablefuture)

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

@@ -10,3 +10,4 @@ This module contains articles about converting between Java date and time object
 - [Convert Between LocalDateTime and ZonedDateTime](https://www.baeldung.com/java-localdatetime-zoneddatetime)
 - [Conversion From 12-Hour Time to 24-Hour Time in Java](https://www.baeldung.com/java-convert-time-format)
 - [Convert Epoch Time to LocalDate and LocalDateTime](https://www.baeldung.com/java-convert-epoch-localdate)
+- [Convert Timestamp String to Long in Java](https://www.baeldung.com/java-convert-timestamp-string-long)

core-java-modules/core-java-ipc/pom.xml

@@ -0,0 +1,16 @@
+<?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-ipc</artifactId>
+    <name>core-java-ipc</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+</project>

core-java-modules/core-java-ipc/src/test/java/com/baeldung/ipc/DirectoryLiveTest.java

@@ -0,0 +1,32 @@
+package com.baeldung.ipc;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardWatchEventKinds;
+import java.nio.file.WatchKey;
+import java.nio.file.WatchEvent;
+import java.nio.file.WatchService;
+
+
+public class DirectoryLiveTest {
+    @Test
+    public void consumer() throws Exception {
+        WatchService watchService = FileSystems.getDefault().newWatchService();
+        // Set this to an appropriate directory.
+        Path path = Paths.get("/tmp/ipc");
+
+        path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE);
+
+        WatchKey key;
+        while ((key = watchService.take()) != null) {
+            for (WatchEvent<?> event : key.pollEvents()) {
+                // React to new file.
+                System.out.println(event);
+            }
+            key.reset();
+        }
+    }
+}

core-java-modules/core-java-ipc/src/test/java/com/baeldung/ipc/JmxLiveTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.ipc;
+
+import org.junit.jupiter.api.Test;
+
+import javax.management.JMX;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+import javax.management.remote.JMXConnector;
+import javax.management.remote.JMXConnectorFactory;
+import javax.management.remote.JMXServiceURL;
+import java.lang.management.ManagementFactory;
+import java.util.concurrent.TimeUnit;
+
+public class JmxLiveTest {
+    /*
+     * This test needs to be run with the following system properties defined:
+     * -Dcom.sun.management.jmxremote=true
+     * -Dcom.sun.management.jmxremote.port=1234
+     * -Dcom.sun.management.jmxremote.authenticate=false
+     * -Dcom.sun.management.jmxremote.ssl=false
+     */
+    @Test
+    public void consumer() throws Exception {
+        ObjectName objectName = new ObjectName("com.baeldung.ipc:type=basic,name=test");
+        MBeanServer server = ManagementFactory.getPlatformMBeanServer();
+        server.registerMBean(new IPCTest(), objectName);
+
+        TimeUnit.MINUTES.sleep(50);
+    }
+
+    @Test
+    public void producer() throws Exception {
+        JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:1234/jmxrmi");
+        try (JMXConnector jmxc = JMXConnectorFactory.connect(url, null)) {
+            ObjectName objectName = new ObjectName("com.baeldung.ipc:type=basic,name=test");
+
+            IPCTestMBean mbeanProxy = JMX.newMBeanProxy(jmxc.getMBeanServerConnection(), objectName, IPCTestMBean.class, true);
+            mbeanProxy.sendMessage("Hello");
+        }
+    }
+
+    public interface IPCTestMBean {
+        void sendMessage(String message);
+    }
+
+    class IPCTest implements IPCTestMBean {
+        @Override
+        public void sendMessage(String message) {
+            System.out.println("Received message: " + message);
+        }
+    }
+}

core-java-modules/core-java-ipc/src/test/java/com/baeldung/ipc/SocketsLiveTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.ipc;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class SocketsLiveTest {
+    @Test
+    public void consumer() throws Exception {
+        try (ServerSocket serverSocket = new ServerSocket(1234)) {
+            Socket clientSocket = serverSocket.accept();
+
+            PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
+            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+
+            String line;
+            while ((line = in.readLine()) != null) {
+                System.out.println("Received message: " + line);
+            }
+        }
+    }
+
+    @Test
+    public void producer() throws Exception {
+        try (Socket clientSocket = new Socket("localhost", 1234)) {
+            PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
+            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+
+            out.println("Hello");
+            
+            String response = in.readLine();
+        }
+    }
+}

core-java-modules/core-java-lang-6/src/main/java/com/baeldung/returnfirstnonnull/LazyEvaluate.java

@@ -0,0 +1,16 @@
+package com.baeldung.returnfirstnonnull;
+
+class LazyEvaluate {
+
+    String methodA() {
+        return null;
+    }
+
+    String methodB() {
+        return "first non null";
+    }
+
+    String methodC() {
+        return "second non null";
+    }
+}

core-java-modules/core-java-lang-6/src/test/java/com/baeldung/returnfirstnonempty/ReturnFirstNonEmptyOptionalUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.returnfirstnonempty;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class ReturnFirstNonEmptyOptionalUnitTest {
+
+    private List<Optional<String>> optionals;
+
+    @BeforeEach
+    public void init() {
+        optionals = Arrays.asList(Optional.<String> empty(), Optional.of("first non empty"), Optional.of("second non empty"));
+    }
+
+    @Test
+    void givenListOfOptionals_whenStreaming_thenReturnFirstNonEmpty() {
+        Optional<String> object = optionals.stream()
+            .filter(Optional::isPresent)
+            .map(Optional::get)
+            .findFirst();
+
+        assertThat(object).contains("first non empty");
+    }
+}

core-java-modules/core-java-lang-6/src/test/java/com/baeldung/returnfirstnonnull/ReturnFirstNonNullLazyEvaluateUnitTest.java

@@ -0,0 +1,77 @@
+package com.baeldung.returnfirstnonnull;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import java.util.Objects;
+import java.util.Optional;
+import java.util.function.Supplier;
+import java.util.stream.Stream;
+
+import org.apache.commons.lang3.ObjectUtils;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class ReturnFirstNonNullLazyEvaluateUnitTest {
+
+    private final LazyEvaluate spy = Mockito.spy(new LazyEvaluate());
+
+    @Test
+    void givenChainOfMethods_whenUsingIfStatements_thenLazilyEvaluateMethodsUntilFirstNonNull() {
+        String object = spy.methodA();
+        if (object == null) {
+            object = spy.methodB();
+        }
+
+        if (object == null) {
+            object = spy.methodC();
+        }
+
+        assertEquals("first non null", object);
+        verify(spy, times(1)).methodA();
+        verify(spy, times(1)).methodB();
+        verify(spy, times(0)).methodC();
+    }
+
+    @Test
+    void givenChainOfMethods_whenUsingApacheCommonsLang3_thenReturnFirstNonNull() {
+        String object = ObjectUtils.getFirstNonNull(spy::methodA, spy::methodB, spy::methodC);
+
+        assertEquals("first non null", object);
+        verify(spy, times(1)).methodA();
+        verify(spy, times(1)).methodB();
+        verify(spy, times(0)).methodC();
+    }
+
+    @Test
+    void givenChainOfMethods_whenUsingSupplierInterface_thenLazilyEvaluateMethodsUntilFirstNonNull() {
+        Optional<String> object = Stream.<Supplier<String>> of(spy::methodA, spy::methodB, spy::methodC)
+            .map(Supplier::get)
+            .filter(Objects::nonNull)
+            .findFirst();
+
+        assertThat(object).contains("first non null");
+        verify(spy, times(1)).methodA();
+        verify(spy, times(1)).methodB();
+        verify(spy, times(0)).methodC();
+    }
+
+    @Test
+    void givenNonNullObjectAndFallbackMethod_whenUsingApacheCommonsLang3_thenReturnFirstNonNull() {
+        String nonNullObject = spy.methodB();
+        String object = ObjectUtils.getIfNull(nonNullObject, spy::methodC);
+
+        assertEquals("first non null", object);
+        verify(spy, times(0)).methodC();
+    }
+
+    @Test
+    void givenNullObjectAndFallbackMethod_whenUsingApacheCommonsLang3_thenReturnFirstNonNull() {
+        String nullObject = null;
+        String object = ObjectUtils.getIfNull(nullObject, spy::methodB);
+
+        assertEquals("first non null", object);
+    }
+}

core-java-modules/core-java-lang-6/src/test/java/com/baeldung/returnfirstnonnull/ReturnFirstNonNullUnitTest.java

@@ -0,0 +1,81 @@
+package com.baeldung.returnfirstnonnull;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+import org.apache.commons.lang3.ObjectUtils;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Predicates;
+import com.google.common.collect.Iterables;
+
+public class ReturnFirstNonNullUnitTest {
+
+    private List<String> objects;
+
+    @BeforeEach
+    public void init() {
+        objects = Arrays.asList(null, "first non null", "second nun null");
+    }
+
+    @Test
+    void givenListOfObjects_whenFilterIsLambdaNullCheckInStream_thenReturnFirstNonNull() {
+        Optional<String> object = objects.stream()
+            .filter(o -> o != null)
+            .findFirst();
+
+        assertThat(object).contains("first non null");
+    }
+
+    @Test
+    void givenListOfObjects_whenFilterIsMethodRefNullCheckInStream_thenReturnFirstNonNull() {
+        Optional<String> object = objects.stream()
+            .filter(Objects::nonNull)
+            .findFirst();
+
+        assertThat(object).contains("first non null");
+    }
+
+    @Test
+    void givenListOfObjects_whenIteratingWithForLoop_thenReturnFirstNonNull() {
+        String object = null;
+        for (int i = 0; i < objects.size(); i++) {
+            if (objects.get(i) != null) {
+                object = objects.get(i);
+                break;
+            }
+        }
+
+        assertEquals("first non null", object);
+    }
+
+    @Test
+    void givenListOfObjects_whenUsingApacheCommonsLang3_thenReturnFirstNonNull() {
+        String object = ObjectUtils.firstNonNull(objects.toArray(new String[0]));
+
+        assertEquals("first non null", object);
+    }
+
+    @Test
+    void givenListOfObjects_whenUsingGoogleGuavaIterables_thenReturnFirstNonNull() {
+        String object = Iterables.find(objects, Predicates.notNull());
+
+        assertEquals("first non null", object);
+    }
+
+    @Test
+    void givenTwoObjects_whenUsingGoogleGuavaMoreObjects_thenReturnFirstNonNull() {
+        String nullObject = null;
+        String nonNullObject = "first non null";
+        String object = MoreObjects.firstNonNull(nullObject, nonNullObject);
+
+        assertEquals("first non null", object);
+    }
+}

core-java-modules/core-java-lang-math-2/src/main/java/com/baeldung/algorithms/rectanglesoverlap/Rectangle.java

@@ -26,13 +26,25 @@ public class Rectangle {
         this.topRight = topRight;
     }
 
-    public boolean isOverlapping(Rectangle other) {
-        // one rectangle is to the top of the other
-        if (this.topRight.getY() < other.bottomLeft.getY() || this.bottomLeft.getY() > other.topRight.getY()) {
+    public boolean isOverlapping(Rectangle comparedRectangle) {
+        // one rectangle is to the top of the comparedRectangle
+        if (this.topRight.getY() < comparedRectangle.bottomLeft.getY() || this.bottomLeft.getY() > comparedRectangle.topRight.getY()) {
             return false;
         }
-        // one rectangle is to the left of the other
-        if (this.topRight.getX() < other.bottomLeft.getX() || this.bottomLeft.getX() > other.topRight.getX()) {
+        // one rectangle is to the left of the comparedRectangle
+        if (this.topRight.getX() < comparedRectangle.bottomLeft.getX() || this.bottomLeft.getX() > comparedRectangle.topRight.getX()) {
+            return false;
+        }
+        return true;
+    }
+
+    public boolean isOverlappingWithoutBorders(Rectangle comparedRectangle) {
+        // one rectangle is to the top of the comparedRectangle
+        if (this.topRight.getY() <= comparedRectangle.bottomLeft.getY() || this.bottomLeft.getY() >= comparedRectangle.topRight.getY()) {
+            return false;
+        }
+        // one rectangle is to the left of the comparedRectangle
+        if (this.topRight.getX() <= comparedRectangle.bottomLeft.getX() || this.bottomLeft.getX() >= comparedRectangle.topRight.getX()) {
             return false;
         }
         return true;

core-java-modules/core-java-lang-math-2/src/test/java/com/baeldung/algorithms/rectanglesoverlap/RectangleUnitTest.java

@@ -1,7 +1,8 @@
 package com.baeldung.algorithms.rectanglesoverlap;
 
-import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 import org.junit.Test;
 
 public class RectangleUnitTest {
@@ -36,4 +37,18 @@ public class RectangleUnitTest {
         assertFalse(rectangle1.isOverlapping(rectangle2));
     }
 
+    @Test
+    public void givenAdjacentRectangles_whensOverlappingCalled_shouldReturnTrue() {
+Rectangle rectangle1 = new Rectangle(new Point(0, 0), new Point(5, 14));
+Rectangle rectangle2 = new Rectangle(new Point(5, 0), new Point(17, 14));
+assertTrue(rectangle1.isOverlapping(rectangle2));
+    }
+
+    @Test
+    public void givenAdjacentRectangles_whensOverlappingWithoutBordersCalled_shouldReturnFalse() {
+        Rectangle rectangle1 = new Rectangle(new Point(0, 0), new Point(5, 14));
+        Rectangle rectangle2 = new Rectangle(new Point(5, 0), new Point(17, 14));
+        assertFalse(rectangle1.isOverlappingWithoutBorders(rectangle2));
+    }
+
 }

core-java-modules/core-java-lang-oop-types-2/README.md

@@ -10,3 +10,4 @@ This module contains articles about types in Java
 - [Filling a List With All Enum Values in Java](https://www.baeldung.com/java-enum-values-to-list)
 - [Comparing a String to an Enum Value in Java](https://www.baeldung.com/java-comparing-string-to-enum)
 - [Implementing toString() on enums in Java](https://www.baeldung.com/java-enums-tostring)
+- [Checking if an Object’s Type Is Enum](https://www.baeldung.com/java-check-object-enum)

core-java-modules/core-java-networking-4/pom.xml

@@ -56,7 +56,7 @@
 
     <properties>
         <apache.commons-validator.version>1.7</apache.commons-validator.version>
-        <jsoup.version>1.15.4</jsoup.version>
+        <jsoup.version>1.16.2</jsoup.version>
     </properties>
 
 </project>

core-java-modules/core-java-string-operations-7/README.md

@@ -5,3 +5,4 @@
 - [Check if a String Contains Only Unicode Letters](https://www.baeldung.com/java-string-all-unicode-characters)
 - [Create a Mutable String in Java](https://www.baeldung.com/java-mutable-string)
 - [Check if a String Contains a Number Value in Java](https://www.baeldung.com/java-string-number-presence)
+- [Difference Between String isEmpty() and isBlank()](https://www.baeldung.com/java-string-isempty-vs-isblank)

core-java-modules/core-java-string-operations-7/pom.xml

@@ -24,12 +24,6 @@
             <artifactId>commons-text</artifactId>
             <version>${commons-text.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.liquibase</groupId>
-            <artifactId>liquibase-core</artifactId>
-            <version>4.9.1</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
@@ -39,7 +33,7 @@
         <dependency>
             <groupId>org.liquibase</groupId>
             <artifactId>liquibase-core</artifactId>
-            <version>4.9.1</version>
+            <version>${liquibase.core.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -67,6 +61,7 @@
         <maven.compiler.target>11</maven.compiler.target>
         <apache.commons.lang3.version>3.13.0</apache.commons.lang3.version>
         <commons-text.version>1.10.0</commons-text.version>
+        <liquibase.core.version>4.25.0</liquibase.core.version>
     </properties>
 
 </project>

core-java-modules/core-java-string-operations-7/src/test/java/com/baeldung/centertext/CenteringTextUnitTest.java

@@ -1,6 +1,6 @@
 package com.baeldung.centertext;
 
-import liquibase.repackaged.org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.junit.Assert;
 import org.junit.jupiter.api.Test;
 

core-java-modules/core-java-swing/pom.xml

@@ -0,0 +1,21 @@
+<?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-string-swing</artifactId>
+    <name>core-java-string-swing</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+    <properties>
+        <maven.compiler.source>20</maven.compiler.source>
+        <maven.compiler.target>20</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

core-java-modules/core-java-swing/src/main/java/com/baeldung/customfont/CustomFonts.java

@@ -0,0 +1,55 @@
+package com.baeldung.customfont;
+
+import javax.swing.*;
+import java.awt.*;
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+public class CustomFonts {
+    public static void main(String[] args) {
+        usingCustomFonts();
+    }
+
+    public static void usingCustomFonts() {
+        final GraphicsEnvironment GE = GraphicsEnvironment.getLocalGraphicsEnvironment();
+        final List<String> AVAILABLE_FONT_FAMILY_NAMES = Arrays.asList(GE.getAvailableFontFamilyNames());
+        try {
+            final List<File> LIST = Arrays.asList(
+                    new File("font/JetBrainsMono/JetBrainsMono-Thin.ttf"),
+                    new File("font/JetBrainsMono/JetBrainsMono-Light.ttf"),
+                    new File("font/Roboto/Roboto-Light.ttf"),
+                    new File("font/Roboto/Roboto-Regular.ttf"),
+                    new File("font/Roboto/Roboto-Medium.ttf")
+            );
+            for (File LIST_ITEM : LIST) {
+                if (LIST_ITEM.exists()) {
+                    Font FONT = Font.createFont(Font.TRUETYPE_FONT, LIST_ITEM);
+                    if (!AVAILABLE_FONT_FAMILY_NAMES.contains(FONT.getFontName())) {
+                        GE.registerFont(FONT);
+                    }
+                }
+            }
+        } catch (FontFormatException | IOException exception) {
+            JOptionPane.showMessageDialog(null, exception.getMessage());
+        }
+
+
+        JFrame frame = new JFrame("Custom Font Example");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setLayout(new FlowLayout());
+
+        JLabel label1 = new JLabel("TEXT1");
+        label1.setFont(new Font("Roboto Medium", Font.PLAIN, 17));
+
+        JLabel label2 = new JLabel("TEXT2");
+        label2.setFont(new Font("JetBrainsMono-Thin", Font.PLAIN, 17));
+
+        frame.add(label1);
+        frame.add(label2);
+
+        frame.pack();
+        frame.setVisible(true);
+    }
+}

core-java-modules/pom.xml

@@ -54,6 +54,7 @@
         <module>core-java-concurrency-simple</module>
         <module>core-java-datetime-string</module>
         <module>core-java-io-conversions-2</module>
+        <module>core-java-ipc</module>
         <module>core-java-jpms</module>
         <module>core-java-lang-oop-constructors-2</module>
         <module>core-java-methods</module>
@@ -183,6 +184,7 @@
         <module>core-java-string-algorithms</module>
         <module>core-java-string-algorithms-2</module>
         <module>core-java-string-apis</module>
+        <module>core-java-swing</module>
         <module>core-java-string-apis-2</module>
         <module>core-java-string-conversions</module>
         <module>core-java-string-conversions-2</module>

gradle-modules/gradle-7/gradle-proxy-configuration/.gitignore

@@ -0,0 +1,42 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

gradle-modules/gradle-7/gradle-proxy-configuration/build.gradle

@@ -0,0 +1,20 @@
+plugins {
+    id 'java'
+}
+
+group = 'org.baeldung'
+version = '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation platform('org.junit:junit-bom:5.9.1')
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    implementation 'io.micrometer:micrometer-core:1.12.0'
+}
+
+test {
+    useJUnitPlatform()
+}

gradle-modules/gradle-7/gradle-proxy-configuration/gradle.properties

@@ -0,0 +1,12 @@
+# HTTP proxy settings
+systemProp.http.proxyHost=localhost
+systemProp.http.proxyPort=3128
+systemProp.http.proxyUser=USER
+systemProp.http.proxyPassword=PASSWORD
+systemProp.http.nonProxyHosts=*.nonproxyrepos.com
+# HTTPS proxy settings
+systemProp.https.proxyHost=localhost
+systemProp.https.proxyPort=3128
+systemProp.https.proxyUser=USER
+systemProp.https.proxyPassword=PASSWORD
+systemProp.https.nonProxyHosts=*.nonproxyrepos.com

gradle-modules/gradle-7/gradle-proxy-configuration/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Thu Nov 16 23:15:01 GMT 2023
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME

gradle-modules/gradle-7/gradle-proxy-configuration/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradle-modules/gradle-7/gradle-proxy-configuration/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

gradle-modules/gradle-7/gradle-proxy-configuration/settings.gradle

@@ -0,0 +1,2 @@
+rootProject.name = 'gradle-proxy-configuration'
+

json-modules/gson-2/src/main/java/com/baeldung/gson/multiplefields/BasicStudent.java

@@ -0,0 +1,64 @@
+package com.baeldung.gson.multiplefields;
+
+import java.util.Objects;
+
+import com.google.gson.annotations.SerializedName;
+
+public class BasicStudent {
+
+    private String name;
+
+    private transient String major;
+
+    @SerializedName("major")
+    private String concentration;
+
+    public BasicStudent() {
+
+    }
+
+    public BasicStudent(String name, String major, String concentration) {
+        this.name = name;
+        this.major = major;
+        this.concentration = concentration;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (!(o instanceof BasicStudent))
+            return false;
+        BasicStudent student = (BasicStudent) o;
+        return Objects.equals(name, student.name) && Objects.equals(major, student.major) && Objects.equals(concentration, student.concentration);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, major, concentration);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getMajor() {
+        return major;
+    }
+
+    public void setMajor(String major) {
+        this.major = major;
+    }
+
+    public String getConcentration() {
+        return concentration;
+    }
+
+    public void setConcentration(String concentration) {
+        this.concentration = concentration;
+    }
+}

json-modules/gson-2/src/main/java/com/baeldung/gson/multiplefields/StudentExclusionStrategy.java

@@ -0,0 +1,18 @@
+package com.baeldung.gson.multiplefields;
+
+import com.google.gson.ExclusionStrategy;
+import com.google.gson.FieldAttributes;
+
+public class StudentExclusionStrategy implements ExclusionStrategy {
+
+    @Override
+    public boolean shouldSkipField(FieldAttributes field) {
+        // Ignore all field values from V1 type
+        return field.getDeclaringClass() == StudentV1.class;
+    }
+
+    @Override
+    public boolean shouldSkipClass(Class<?> aClass) {
+        return false;
+    }
+}

json-modules/gson-2/src/main/java/com/baeldung/gson/multiplefields/StudentV1.java

@@ -0,0 +1,34 @@
+package com.baeldung.gson.multiplefields;
+
+public class StudentV1 {
+
+    private String firstName;
+    private String lastName;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    // Default constructor for Gson
+    public StudentV1() {
+
+    }
+
+    public StudentV1(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+}

json-modules/gson-2/src/main/java/com/baeldung/gson/multiplefields/StudentV2.java

@@ -0,0 +1,71 @@
+package com.baeldung.gson.multiplefields;
+
+import java.util.Objects;
+
+import com.google.gson.annotations.Expose;
+
+public class StudentV2 extends StudentV1 {
+
+    @Expose
+    private String firstName;
+
+    @Expose
+    private String lastName;
+
+    @Expose
+    private String major;
+
+    @Override
+    public String getFirstName() {
+        return firstName;
+    }
+
+    @Override
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    @Override
+    public String getLastName() {
+        return lastName;
+    }
+
+    @Override
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getMajor() {
+        return major;
+    }
+
+    public void setMajor(String major) {
+        this.major = major;
+    }
+
+    // Default constructor for Gson
+    public StudentV2() {
+
+    }
+
+    public StudentV2(String firstName, String lastName, String major) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.major = major;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (!(o instanceof StudentV2))
+            return false;
+        StudentV2 studentV2 = (StudentV2) o;
+        return Objects.equals(firstName, studentV2.firstName) && Objects.equals(lastName, studentV2.lastName) && Objects.equals(major, studentV2.major);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(firstName, lastName, major);
+    }
+}

json-modules/gson-2/src/test/java/com/baeldung/gson/multiplefields/GsonMultipleFieldsUnitTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.gson.multiplefields;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import org.junit.Test;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+public class GsonMultipleFieldsUnitTest {
+
+    @Test
+    public void givenBasicStudent_whenSerializingWithGson_thenTransientFieldNotSet() {
+        // Given a class with a transient field
+        BasicStudent student = new BasicStudent("Henry Winter", "Greek Studies", "Classical Greek Studies");
+
+        // When serializing using Gson
+        Gson gson = new Gson();
+        String json = gson.toJson(student);
+
+        // Then the deserialized instance doesn't contain the transient field value
+        BasicStudent deserialized = gson.fromJson(json, BasicStudent.class);
+        assertThat(deserialized.getMajor()).isNull();
+    }
+
+    @Test
+    public void givenStudentV2_whenSerializingWithGson_thenIllegalArgumentExceptionIsThrown() {
+        // Given a class with a class hierarchy that defines multiple fields with the same name
+        StudentV2 student = new StudentV2("Henry", "Winter", "Greek Studies");
+
+        // When serializing using Gson, then an IllegalArgumentException exception is thrown
+        Gson gson = new Gson();
+        assertThatThrownBy(() -> gson.toJson(student)).isInstanceOf(IllegalArgumentException.class)
+            .hasMessageContaining("declares multiple JSON fields named 'firstName'");
+    }
+
+    @Test
+    public void givenStudentV2_whenSerializingWithGsonExposeAnnotation_thenSerializes() {
+        // Given a class with a class hierarchy that defines multiple fields with the same name
+        StudentV2 student = new StudentV2("Henry", "Winter", "Greek Studies");
+
+        // When serializing using Gson exclude fields without @Expose
+        Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation()
+            .create();
+
+        // Then ensure the student can be serialized, then deserialized back into an equal instance
+        String json = gson.toJson(student);
+        assertThat(gson.fromJson(json, StudentV2.class)).isEqualTo(student);
+    }
+
+    @Test
+    public void givenStudentV2_whenSerializingWithGsonExclusionStrategy_thenSerializes() {
+        // Given a class with a class hierarchy that defines multiple fields with the same name
+        StudentV2 student = new StudentV2("Henry", "Winter", "Greek Studies");
+
+        // When serializing using Gson add an ExclusionStrategy
+        Gson gson = new GsonBuilder().setExclusionStrategies(new StudentExclusionStrategy())
+            .create();
+
+        // Then ensure the student can be serialized, then deserialized back into an equal instance
+        assertThat(gson.fromJson(gson.toJson(student), StudentV2.class)).isEqualTo(student);
+    }
+
+}

jsoup/pom.xml

@@ -22,7 +22,7 @@
     </dependencies>
 
     <properties>
-        <jsoup.version>1.10.2</jsoup.version>
+        <jsoup.version>1.16.2</jsoup.version>
     </properties>
 
 </project>

jsoup/src/test/java/com/baeldung/jsoup/PreservingLineBreaksUnitTest.java

@@ -2,7 +2,7 @@ package com.baeldung.jsoup;
 
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
-import org.jsoup.safety.Whitelist;
+import org.jsoup.safety.Safelist;
 import org.junit.Test;
 import static org.junit.Assert.assertEquals;
 
@@ -13,7 +13,7 @@ public class PreservingLineBreaksUnitTest {
         String strHTML = "<html><body>Hello\nworld</body></html>";
         Document.OutputSettings outputSettings = new Document.OutputSettings();
         outputSettings.prettyPrint(false);
-        String strWithNewLines = Jsoup.clean(strHTML, "", Whitelist.none(), outputSettings);
+        String strWithNewLines = Jsoup.clean(strHTML, "", Safelist.none(), outputSettings);
         assertEquals("Hello\nworld", strWithNewLines);
     }
 
@@ -33,7 +33,7 @@ public class PreservingLineBreaksUnitTest {
         jsoupDoc.select("p").before("\\n");
         String str = jsoupDoc.html().replaceAll("\\\\n", "\n");
         String strWithNewLines =
-                Jsoup.clean(str, "", Whitelist.none(), outputSettings);
+                Jsoup.clean(str, "", Safelist.none(), outputSettings);
         assertEquals("Hello\nWorld\nParagraph", strWithNewLines);
     }
 }

libraries-6/pom.xml

@@ -197,7 +197,7 @@
         <javapoet.version>1.10.0</javapoet.version>
         <mockftpserver.version>2.7.1</mockftpserver.version>
         <functionaljava.version>4.8.1</functionaljava.version>
-        <resilience4j.version>0.12.1</resilience4j.version>
+        <resilience4j.version>2.1.0</resilience4j.version>
         <protonpack.version>1.15</protonpack.version>
         <commons-net.version>3.6</commons-net.version>
         <renjin.version>3.5-beta72</renjin.version>

libraries-6/src/test/java/com/baeldung/resilence4j/Resilience4jUnitTest.java

@@ -43,7 +43,7 @@ public class Resilience4jUnitTest {
                                                           // Percentage of failures to start short-circuit
                                                           .failureRateThreshold(20)
                                                           // Min number of call attempts
-                                                          .ringBufferSizeInClosedState(5)
+                                                          .slidingWindowSize(5)
                                                           .build();
         CircuitBreakerRegistry registry = CircuitBreakerRegistry.of(config);
         CircuitBreaker circuitBreaker = registry.circuitBreaker("my");
@@ -70,7 +70,7 @@ public class Resilience4jUnitTest {
 
         Future<?> taskInProgress = callAndBlock(decorated);
         try {
-            assertThat(bulkhead.isCallPermitted()).isFalse();
+            assertThat(bulkhead.tryAcquirePermission()).isFalse();
         } finally {
             taskInProgress.cancel(true);
         }

pdf/pom.xml

@@ -111,12 +111,12 @@
         <poi-scratchpad.version>3.15</poi-scratchpad.version>
         <batik-transcoder.version>1.8</batik-transcoder.version>
         <poi-ooxml.version>3.15</poi-ooxml.version>
-        <thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
-        <flying-saucer-pdf.version>9.1.20</flying-saucer-pdf.version>
+        <thymeleaf.version>3.1.2.RELEASE</thymeleaf.version>
+        <flying-saucer-pdf.version>9.3.1</flying-saucer-pdf.version>
         <open-html-pdfbox.version>1.0.6</open-html-pdfbox.version>
-        <open-html-pdf-core.version>1.0.6</open-html-pdf-core.version>
-        <flying-saucer-pdf-openpdf.version>9.1.22</flying-saucer-pdf-openpdf.version>
-        <jsoup.version>1.14.2</jsoup.version>
+        <open-html-pdf-core.version>1.0.10</open-html-pdf-core.version>
+        <flying-saucer-pdf-openpdf.version>9.2.1</flying-saucer-pdf-openpdf.version>
+        <jsoup.version>1.16.2</jsoup.version>
     </properties>
 
 </project>

persistence-modules/liquibase/pom.xml

@@ -37,7 +37,7 @@
 
     <properties>
         <mysql-connector-java.version>5.1.6</mysql-connector-java.version>
-        <liquibase-maven-plugin.version>3.4.2</liquibase-maven-plugin.version>
+        <liquibase-maven-plugin.version>4.25.0</liquibase-maven-plugin.version>
     </properties>
 
 </project>

persistence-modules/spring-data-jpa-repo-2/README.md

@@ -2,9 +2,7 @@
 
 ### Relevant Articles: 
 
-- [Introduction to Spring Data JPA](https://www.baeldung.com/the-persistence-layer-with-spring-data-jpa)
 - [Performance Difference Between save() and saveAll() in Spring Data](https://www.baeldung.com/spring-data-save-saveall)
-- [LIKE Queries in Spring JPA Repositories](https://www.baeldung.com/spring-jpa-like-queries)
 - [How to Access EntityManager with Spring Data](https://www.baeldung.com/spring-data-entitymanager)
 - [Difference Between JPA and Spring Data JPA](https://www.baeldung.com/spring-data-jpa-vs-jpa)
 - [Differences Between Spring Data JPA findFirst() and findTop()](https://www.baeldung.com/spring-data-jpa-findfirst-vs-findtop)

persistence-modules/spring-data-jpa-repo-2/pom.xml

@@ -42,11 +42,6 @@
             <groupId>com.querydsl</groupId>
             <artifactId>querydsl-jpa</artifactId>
         </dependency>
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
-        </dependency>
     </dependencies>
 
     <build>

persistence-modules/spring-data-jpa-repo-2/src/test/resources/test-movie-cleanup.sql

@@ -1 +0,0 @@
-DELETE FROM "movie";

persistence-modules/spring-data-jpa-repo-2/src/test/resources/test-movie-data.sql

@@ -1,7 +0,0 @@
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(1, 'Godzilla: King of the Monsters', ' Michael Dougherty', 'PG-13', 132);
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(2, 'Avengers: Endgame', 'Anthony Russo', 'PG-13', 181);
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(3, 'Captain Marvel', 'Anna Boden', 'PG-13', 123);
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(4, 'Dumbo', 'Tim Burton', 'PG', 112);
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(5, 'Booksmart', 'Olivia Wilde', 'R', 102);
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(6, 'Aladdin', 'Guy Ritchie', 'PG', 128);
-INSERT INTO "movie" ("id", "title", "director", "rating", "duration") VALUES(7, 'The Sun Is Also a Star', 'Ry Russo-Young', 'PG-13', 100);

persistence-modules/spring-data-jpa-repo/README.md

@@ -3,6 +3,7 @@
 This module contains articles about repositories in Spring Data JPA 
 
 ### Relevant Articles: 
+- [Introduction to Spring Data JPA](https://www.baeldung.com/the-persistence-layer-with-spring-data-jpa)
 - [Case Insensitive Queries with Spring Data Repository](https://www.baeldung.com/spring-data-case-insensitive-queries)
 - [Derived Query Methods in Spring Data JPA Repositories](https://www.baeldung.com/spring-data-derived-queries)
 - [Spring Data – CrudRepository save() Method](https://www.baeldung.com/spring-data-crud-repository-save)
@@ -10,6 +11,8 @@ This module contains articles about repositories in Spring Data JPA
 - [Spring Data Composable Repositories](https://www.baeldung.com/spring-data-composable-repositories)
 - [Spring Data JPA Repository Populators](https://www.baeldung.com/spring-data-jpa-repository-populators)
 - [Calling Stored Procedures from Spring Data JPA Repositories](https://www.baeldung.com/spring-data-jpa-stored-procedures)
+- [LIKE Queries in Spring JPA Repositories](https://www.baeldung.com/spring-jpa-like-queries)
+
 - More articles: [[--> next]](../spring-data-jpa-repo-2)
 
 ### Eclipse Config 

persistence-modules/spring-data-jpa-repo/pom.xml

@@ -42,6 +42,11 @@
             <groupId>org.springframework</groupId>
             <artifactId>spring-oxm</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
     </dependencies>
 
 </project>

persistence-modules/spring-data-jpa-repo/src/main/java/com/baeldung/repository/Foo.java

@@ -1,8 +1,13 @@
-package com.baeldung.spring.data.persistence.repository;
+package com.baeldung.repository;
 
-import javax.persistence.*;
 import java.io.Serializable;
 
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
 @Entity
 public class Foo implements Serializable {
     @Id

persistence-modules/spring-data-jpa-repo/src/main/java/com/baeldung/repository/FooService.java

@@ -1,4 +1,4 @@
-package com.baeldung.spring.data.persistence.repository;
+package com.baeldung.repository;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

persistence-modules/spring-data-jpa-repo/src/main/java/com/baeldung/repository/IFooDAO.java

@@ -1,8 +1,9 @@
-package com.baeldung.spring.data.persistence.repository;
+package com.baeldung.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
 
 public interface IFooDAO extends JpaRepository<Foo, Long> {
 

persistence-modules/spring-data-jpa-repo/src/main/java/com/baeldung/repository/IFooService.java

@@ -1,4 +1,4 @@
-package com.baeldung.spring.data.persistence.repository;
+package com.baeldung.repository;
 
 public interface IFooService {
     Foo create(Foo foo);

persistence-modules/spring-data-jpa-repo/src/main/java/com/baeldung/repository/PersistenceConfig.java

@@ -1,6 +1,9 @@
-package com.baeldung.spring.data.persistence.repository;
+package com.baeldung.repository;
+
+import java.util.Properties;
+
+import javax.sql.DataSource;
 
-import com.google.common.base.Preconditions;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
@@ -16,15 +19,14 @@ import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 import org.springframework.transaction.PlatformTransactionManager;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 
-import javax.sql.DataSource;
-import java.util.Properties;
+import com.google.common.base.Preconditions;
 
 @Configuration
 @PropertySource("classpath:persistence.properties")
-@ComponentScan("com.baeldung.spring.data.persistence.repository")
+@ComponentScan("com.baeldung.repository")
 //@ImportResource("classpath*:*springDataConfig.xml")
 @EnableTransactionManagement
-@EnableJpaRepositories(basePackages = "com.baeldung.spring.data.persistence.repository")
+@EnableJpaRepositories(basePackages = "com.baeldung.repository")
 public class PersistenceConfig {
 
     @Autowired

persistence-modules/spring-data-jpa-repo/src/main/java/com/baeldung/spring/data/persistence/like/repository/MovieRepository.java

@@ -1,11 +1,12 @@
 package com.baeldung.spring.data.persistence.like.repository;
 
-import com.baeldung.spring.data.persistence.like.model.Movie;
+import java.util.List;
+
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.query.Param;
 
-import java.util.List;
+import com.baeldung.spring.data.persistence.like.model.Movie;
 
 public interface MovieRepository extends CrudRepository<Movie, Long> {
 

persistence-modules/spring-data-jpa-repo/src/main/resources/persistence.properties

@@ -0,0 +1,9 @@
+# jdbc.X
+jdbc.driverClassName=org.h2.Driver
+jdbc.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
+jdbc.user=sa
+jdbc.pass=sa
+
+# hibernate.X
+hibernate.hbm2ddl.auto=create-drop
+hibernate.dialect=org.hibernate.dialect.H2Dialect

persistence-modules/spring-data-jpa-repo/src/main/resources/springDataConfig.xml

@@ -7,5 +7,5 @@
     http://www.springframework.org/schema/data/jpa
     http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"
 >
-    <jpa:repositories base-package="com.baeldung.spring.data.persistence.repository"/>
+    <jpa:repositories base-package="com.baeldung.repository"/>
 </beans>

persistence-modules/spring-data-jpa-repo/src/test/java/com/baeldung/repository/FooServiceIntegrationTest.java

@@ -1,4 +1,6 @@
-package com.baeldung.spring.data.persistence.repository;
+package com.baeldung.repository;
+
+import javax.sql.DataSource;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -7,8 +9,6 @@ import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
 
-import javax.sql.DataSource;
-
 @RunWith(SpringRunner.class)
 @ContextConfiguration(classes = PersistenceConfig.class)
 public class FooServiceIntegrationTest {

persistence-modules/spring-data-jpa-repo/src/test/java/com/baeldung/spring/data/persistence/like/MovieRepositoryIntegrationTest.java

@@ -1,7 +1,12 @@
 package com.baeldung.spring.data.persistence.like;
 
-import com.baeldung.spring.data.persistence.like.model.Movie;
-import com.baeldung.spring.data.persistence.like.repository.MovieRepository;
+import static org.junit.Assert.assertEquals;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
+
+import java.util.List;
+
+import javax.sql.DataSource;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -9,11 +14,8 @@ import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.jdbc.Sql;
 import org.springframework.test.context.junit4.SpringRunner;
 
-import javax.sql.DataSource;
-import java.util.List;
-
-import static org.junit.Assert.assertEquals;
-import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
+import com.baeldung.spring.data.persistence.like.model.Movie;
+import com.baeldung.spring.data.persistence.like.repository.MovieRepository;
 
 @RunWith(SpringRunner.class)
 @Sql(scripts = { "/test-movie-data.sql" })

persistence-modules/spring-data-jpa-repo/src/test/resources/application-test.properties

@@ -1,2 +1,2 @@
-spring.jpa.hibernate.ddl-auto=update
-spring.datasource.url=jdbc:h2:mem:jpa3
+#spring.jpa.hibernate.ddl-auto=update
+#spring.datasource.url=jdbc:h2:mem:jpa3

persistence-modules/spring-data-jpa-repo/src/test/resources/test-movie-cleanup.sql

@@ -0,0 +1 @@
+DELETE FROM movie;

persistence-modules/spring-data-jpa-repo/src/test/resources/test-movie-data.sql

@@ -0,0 +1,7 @@
+INSERT INTO movie(id,title,director,rating,duration) VALUES(1, 'Godzilla: King of the Monsters', ' Michael Dougherty', 'PG-13', 132);
+INSERT INTO movie(id,title,director,rating,duration) VALUES(2, 'Avengers: Endgame', 'Anthony Russo', 'PG-13', 181);
+INSERT INTO movie(id,title,director,rating,duration) VALUES(3, 'Captain Marvel', 'Anna Boden', 'PG-13', 123);
+INSERT INTO movie(id,title,director,rating,duration) VALUES(4, 'Dumbo', 'Tim Burton', 'PG', 112);
+INSERT INTO movie(id,title,director,rating,duration) VALUES(5, 'Booksmart', 'Olivia Wilde', 'R', 102);
+INSERT INTO movie(id,title,director,rating,duration) VALUES(6, 'Aladdin', 'Guy Ritchie', 'PG', 128);
+INSERT INTO movie(id,title,director,rating,duration) VALUES(7, 'The Sun Is Also a Star', 'Ry Russo-Young', 'PG-13', 100);

pom.xml

@@ -889,7 +889,7 @@
                 <module>spring-vault</module>
                 <module>spring-web-modules</module>
                 <module>spring-websockets</module>
-                <module>static-analysis</module>
+<!--            <module>static-analysis</module> - requires additional configuration to be compiled due to the JVM strong encapsulation -->
                 <module>tablesaw</module>
                 <module>tensorflow-java</module>
                 <module>testing-modules</module>
@@ -1134,7 +1134,7 @@
                 <module>spring-vault</module>
                 <module>spring-web-modules</module>
                 <module>spring-websockets</module>
-                <module>static-analysis</module>
+<!--            <module>static-analysis</module> - requires additional configuration to be compiled due to the JVM strong encapsulation -->
                 <module>tablesaw</module>
                 <module>tensorflow-java</module>
                 <module>testing-modules</module>

quarkus-modules/quarkus-extension/quarkus-liquibase/runtime/pom.xml

@@ -66,8 +66,7 @@
     </build>
 
     <properties>
-        <liquibase-core.version>3.8.1</liquibase-core.version>
-        <liquibase.version>3.8.1</liquibase.version>
+        <liquibase-core.version>4.25.0</liquibase-core.version>
     </properties>
 
 </project>

spring-5-webflux-2/pom.xml

@@ -86,6 +86,7 @@
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>
             <artifactId>mockwebserver</artifactId>
+            <version>4.12.0</version> <!-- this can be removed when we migrate spring-boot-dependencies to the latest version -->
         </dependency>
     </dependencies>
 

spring-5-webflux/pom.xml

@@ -74,6 +74,7 @@
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>
             <artifactId>mockwebserver</artifactId>
+            <version>4.12.0</version> <!-- this can be removed when we migrate spring-boot-dependencies to the latest version -->
         </dependency>
     </dependencies>
 

spring-cucumber/pom.xml

@@ -11,9 +11,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-boot-2</artifactId>
+        <artifactId>parent-boot-3</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-boot-2</relativePath>
+        <relativePath>../parent-boot-3</relativePath>
     </parent>
 
     <dependencies>
@@ -53,16 +53,17 @@
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-io -->
         <dependency>
-            <groupId>org.apache.commons</groupId>
+            <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
             <version>${commons-io.version}</version>
         </dependency>
     </dependencies>
 
     <properties>
+        <!-- The main class to start by executing java -jar -->
+        <start-class>com.baeldung.SpringDemoApplication</start-class>
         <cucumber.version>7.14.0</cucumber.version>
-        <commons-io.version>1.3.2</commons-io.version>
-        <junit-vintage-engine.version>5.10.0</junit-vintage-engine.version>
+        <junit-vintage-engine.version>5.10.1</junit-vintage-engine.version>
     </properties>
 
 </project>

spring-cucumber/src/main/java/com/baeldung/cucumberoptions/HealthCheckController.java

@@ -3,6 +3,7 @@ package com.baeldung.cucumberoptions;
 import static org.springframework.http.MediaType.APPLICATION_JSON_VALUE;
 
 import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -11,12 +12,12 @@ import org.springframework.web.bind.annotation.RestController;
 public class HealthCheckController {
 
     @GetMapping(path = "/v1/status", produces = APPLICATION_JSON_VALUE)
-    public HttpStatus getV1Status() {
+    public HttpStatusCode getV1Status() {
         return ResponseEntity.ok().build().getStatusCode();
     }
 
     @GetMapping(path = "/v2/status", produces = APPLICATION_JSON_VALUE)
-    public HttpStatus getV2Status() {
+    public HttpStatusCode getV2Status() {
         return ResponseEntity.ok().build().getStatusCode();
     }
 }

spring-cucumber/src/test/java/com/baeldung/SpringIntegrationTest.java

@@ -9,6 +9,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.web.client.ResponseErrorHandler;
@@ -69,7 +71,7 @@ public class SpringIntegrationTest {
 
         @Override
         public boolean hasError(ClientHttpResponse response) throws IOException {
-            hadError = response.getRawStatusCode() >= 400;
+            hadError = response.getStatusCode().value() >= 400;
             return hadError;
         }
 

spring-cucumber/src/test/java/com/baeldung/StepDefsIntegrationTest.java

@@ -5,6 +5,7 @@ import io.cucumber.java.en.Given;
 import io.cucumber.java.en.Then;
 import io.cucumber.java.en.When;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
@@ -29,7 +30,7 @@ public class StepDefsIntegrationTest extends SpringIntegrationTest {
 
     @Then("^the client receives status code of (\\d+)$")
     public void the_client_receives_status_code_of(int statusCode) throws Throwable {
-        final HttpStatus currentStatusCode = latestResponse.getTheResponse().getStatusCode();
+        final HttpStatusCode currentStatusCode = latestResponse.getTheResponse().getStatusCode();
         assertThat("status code is incorrect : " + latestResponse.getBody(), currentStatusCode.value(), is(statusCode));
     }
 

spring-cucumber/src/test/java/com/baeldung/cucumberoptions/HealthCheckStepDefsIntegrationTest.java

@@ -3,7 +3,8 @@ package com.baeldung.cucumberoptions;
 import io.cucumber.java.en.Then;
 import io.cucumber.java.en.When;
 
-import org.springframework.http.HttpStatus;
+
+import org.springframework.http.HttpStatusCode;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.client.RestTemplate;
 
@@ -32,7 +33,7 @@ public class HealthCheckStepDefsIntegrationTest extends SpringIntegrationTest {
 
     @Then("^the client receives (\\d+) status code$")
     public void verifyStatusCode(int statusCode) throws Throwable {
-        final HttpStatus currentStatusCode = statusResponse.getStatusCode();
+        final HttpStatusCode currentStatusCode = statusResponse.getStatusCode();
         assertThat(currentStatusCode.value(), is(statusCode));
     }
 }

spring-di-4/README.md

@@ -7,4 +7,5 @@ This module contains articles about dependency injection with Spring
 - [Using @Autowired in Abstract Classes](https://www.baeldung.com/spring-autowired-abstract-class)
 - [Spring @Component Annotation](https://www.baeldung.com/spring-component-annotation)
 - [Why Is Field Injection Not Recommended?](https://www.baeldung.com/java-spring-field-injection-cons)
+- [Setting a Spring Bean to Null](https://www.baeldung.com/spring-setting-bean-null)
 - More articles: [[<-- prev]](../spring-di-3)

spring-kafka-2/README.md

@@ -9,3 +9,4 @@ This module contains articles about Spring with Kafka
 - [Understanding Kafka Topics and Partitions](https://www.baeldung.com/kafka-topics-partitions)
 - [How to Subscribe a Kafka Consumer to Multiple Topics](https://www.baeldung.com/kafka-subscribe-consumer-multiple-topics)
 - [Splitting Streams in Kafka](https://www.baeldung.com/kafka-splitting-streams)
+- [Manage Kafka Consumer Groups](https://www.baeldung.com/kafka-manage-consumer-groups)

spring-security-modules/spring-security-core-2/src/main/java/com/baeldung/httpsecurityvswebsecurity/HttpSecurityConfig.java

@@ -1,16 +1,17 @@
 package com.baeldung.httpsecurityvswebsecurity;
 
+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.EnableWebSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.web.SecurityFilterChain;
 
 @Configuration
 @EnableWebSecurity
-public class HttpSecurityConfig extends WebSecurityConfigurerAdapter {
+public class HttpSecurityConfig {
 
-    @Override
-    protected void configure(HttpSecurity http) throws Exception {
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
         // Given: HttpSecurity configured
 
         http.authorizeRequests()
@@ -27,5 +28,6 @@ public class HttpSecurityConfig extends WebSecurityConfigurerAdapter {
 
         // When: Accessing specific URLs
         // Then: Access is granted based on defined rules
+        return http.build();
     }
 }

spring-security-modules/spring-security-core-2/src/main/java/com/baeldung/httpsecurityvswebsecurity/WebSecurityConfig.java

@@ -1,35 +1,48 @@
 package com.baeldung.httpsecurityvswebsecurity;
 
+import org.springframework.context.annotation.Bean;
+import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.config.http.SessionCreationPolicy;
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 import org.springframework.security.web.SecurityFilterChain;
 
 @Configuration
-public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
+public class WebSecurityConfig {
 
     @Autowired
     private UserDetailsService userDetailsService;
 
-    @Override
-    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
-        auth
-          .userDetailsService(userDetailsService)
-          .passwordEncoder(new BCryptPasswordEncoder());
+    @Bean
+    public BCryptPasswordEncoder bCryptPasswordEncoder() {
+        return new BCryptPasswordEncoder();
     }
 
-    @Override
-    protected void configure(HttpSecurity http) throws Exception {
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+
+        AuthenticationManagerBuilder authenticationManagerBuilder = http.getSharedObject(AuthenticationManagerBuilder.class);
+        authenticationManagerBuilder.userDetailsService(userDetailsService);
+        AuthenticationManager authenticationManager = authenticationManagerBuilder.build();
+
         http.authorizeRequests()
-          .antMatchers("/")
-          .permitAll()
-          .anyRequest()
-          .authenticated()
-          .and()
-          .formLogin();
+            .antMatchers("/")
+            .permitAll()
+            .anyRequest()
+            .authenticated()
+            .and()
+            .formLogin().and()
+            .authenticationManager(authenticationManager)
+            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
+
+        return http.build();
+    }
+
+    protected void configure(HttpSecurity http) throws Exception {
+
     }
 }

spring-security-modules/spring-security-oauth2/src/main/java/com/baeldung/oauth2resttemplate/SecurityConfig.java

@@ -8,7 +8,6 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 import org.springframework.security.oauth2.client.OAuth2ClientContext;
 import org.springframework.security.oauth2.client.OAuth2RestTemplate;
 import org.springframework.security.oauth2.client.filter.OAuth2ClientAuthenticationProcessingFilter;

spring-security-modules/spring-security-saml/src/main/java/com/baeldung/saml/config/WebSecurityConfig.java

@@ -10,11 +10,9 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.authentication.AuthenticationManager;
-import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 import org.springframework.security.saml.*;
 import org.springframework.security.saml.key.KeyManager;
 import org.springframework.security.saml.metadata.*;
@@ -31,7 +29,7 @@ import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
 @Configuration
 @EnableWebSecurity
 @EnableGlobalMethodSecurity(securedEnabled = true)
-public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
+public class WebSecurityConfig {
 
     @Value("${saml.sp}")
     private String samlAudience;
@@ -55,8 +53,7 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
 
     @Bean
     public SAMLDiscovery samlDiscovery() {
-        SAMLDiscovery idpDiscovery = new SAMLDiscovery();
-        return idpDiscovery;
+        return new SAMLDiscovery();
     }
 
     @Autowired
@@ -78,19 +75,19 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
     }
 
     @Bean
-    public SAMLProcessingFilter samlWebSSOProcessingFilter() throws Exception {
+    public SAMLProcessingFilter samlWebSSOProcessingFilter(AuthenticationManager authenticationManager) {
         SAMLProcessingFilter samlWebSSOProcessingFilter = new SAMLProcessingFilter();
-        samlWebSSOProcessingFilter.setAuthenticationManager(authenticationManager());
+        samlWebSSOProcessingFilter.setAuthenticationManager(authenticationManager);
         samlWebSSOProcessingFilter.setAuthenticationSuccessHandler(samlAuthSuccessHandler);
         samlWebSSOProcessingFilter.setAuthenticationFailureHandler(samlAuthFailureHandler);
         return samlWebSSOProcessingFilter;
     }
 
     @Bean
-    public FilterChainProxy samlFilter() throws Exception {
+    public FilterChainProxy samlFilter(SAMLProcessingFilter samlProcessingFilter) throws Exception {
         List<SecurityFilterChain> chains = new ArrayList<>();
         chains.add(new DefaultSecurityFilterChain(new AntPathRequestMatcher("/saml/SSO/**"),
-            samlWebSSOProcessingFilter()));
+            samlProcessingFilter));
         chains.add(new DefaultSecurityFilterChain(new AntPathRequestMatcher("/saml/discovery/**"),
             samlDiscovery()));
         chains.add(new DefaultSecurityFilterChain(new AntPathRequestMatcher("/saml/login/**"),
@@ -102,19 +99,13 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
         return new FilterChainProxy(chains);
     }
 
-    @Bean
-    @Override
-    public AuthenticationManager authenticationManagerBean() throws Exception {
-        return super.authenticationManagerBean();
-    }
-
     @Bean
     public MetadataGeneratorFilter metadataGeneratorFilter() {
         return new MetadataGeneratorFilter(metadataGenerator());
     }
 
-    @Override
-    protected void configure(HttpSecurity http) throws Exception {
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http, SAMLProcessingFilter samlProcessingFilter) throws Exception {
         http
         .csrf()
         .disable();
@@ -125,8 +116,8 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
 
         http
         .addFilterBefore(metadataGeneratorFilter(), ChannelProcessingFilter.class)
-        .addFilterAfter(samlFilter(), BasicAuthenticationFilter.class)
-        .addFilterBefore(samlFilter(), CsrfFilter.class);
+        .addFilterAfter(samlProcessingFilter, BasicAuthenticationFilter.class)
+        .addFilterBefore(samlProcessingFilter, CsrfFilter.class);
 
         http
         .authorizeRequests()
@@ -142,11 +133,10 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
                 e.printStackTrace();
             }
         });
-    }
 
-    @Override
-    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
-        auth.authenticationProvider(samlAuthenticationProvider);
+        http.authenticationProvider(samlAuthenticationProvider);
+
+        return http.build();
     }
 
 }

spring-security-modules/spring-security-web-persistent-login/src/main/java/com/baeldung/spring/SecurityConfig.java

@@ -3,7 +3,6 @@ package com.baeldung.spring;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.ImportResource;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 
 /**
  * Spring Security Configuration.
@@ -11,7 +10,7 @@ import org.springframework.security.config.annotation.web.configuration.WebSecur
 @Configuration
 @EnableWebSecurity
 @ImportResource({ "classpath:webSecurityConfig.xml" })
-public class SecurityConfig extends WebSecurityConfigurerAdapter {
+public class SecurityConfig {
 
     public SecurityConfig() {
         super();

spring-web-modules/spring-mvc-basics-2/pom.xml

@@ -150,7 +150,7 @@
     <properties>
         <hibernate-validator.version>8.0.1.Final</hibernate-validator.version>
         <deploy-path>enter-location-of-server</deploy-path>
-        <org.thymeleaf-version>3.0.11.RELEASE</org.thymeleaf-version>
+        <org.thymeleaf-version>3.1.2.RELEASE</org.thymeleaf-version>
         <groovy.version>2.4.12</groovy.version>
         <freemarker.version>2.3.27-incubating</freemarker.version>
         <jade.version>1.2.5</jade.version>

spring-web-modules/spring-rest-http-2/pom.xml

@@ -51,7 +51,7 @@
 
     <properties>
         <swagger2.version>2.9.2</swagger2.version>
-        <resilience4j.version>1.6.1</resilience4j.version>
+        <resilience4j.version>2.1.0</resilience4j.version>
         <springdoc.version>1.7.0</springdoc.version>
     </properties>
 

spring-web-modules/spring-thymeleaf-5/pom.xml

@@ -135,7 +135,7 @@
 
     <properties>
         <spring-data.version>2.3.2.RELEASE</spring-data.version>
-        <org.thymeleaf-version>3.0.11.RELEASE</org.thymeleaf-version>
+        <org.thymeleaf-version>3.1.2.RELEASE</org.thymeleaf-version>
         <org.thymeleaf.extras-version>3.0.4.RELEASE</org.thymeleaf.extras-version>
         <thymeleaf-layout-dialect.version>2.4.1</thymeleaf-layout-dialect.version>
         <javax.validation-version>2.0.1.Final</javax.validation-version>

spring-web-modules/spring-thymeleaf/pom.xml

@@ -136,7 +136,7 @@
 
     <properties>
         <spring-data.version>2.3.2.RELEASE</spring-data.version>
-        <org.thymeleaf-version>3.0.11.RELEASE</org.thymeleaf-version>
+        <org.thymeleaf-version>3.1.2.RELEASE</org.thymeleaf-version>
         <org.thymeleaf.extras-version>3.0.4.RELEASE</org.thymeleaf.extras-version>
         <thymeleaf-layout-dialect.version>2.4.1</thymeleaf-layout-dialect.version>
         <javax.validation-version>2.0.1.Final</javax.validation-version>

static-analysis/error-prone-project/.mvn/jvm.config

@@ -0,0 +1,10 @@
+--add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
+--add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
+--add-opens jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
+--add-opens jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED

static-analysis/error-prone-project/pom.xml

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>static-analysis</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>error-prone-project</artifactId>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <release>17</release>
+                    <encoding>UTF-8</encoding>
+                    <fork>true</fork>
+                    <compilerArgs>
+                        <arg>-XDcompilePolicy=simple</arg>
+                        <arg>-Xplugin:ErrorProne</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
+                        <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
+                        <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
+                        <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
+                    </compilerArgs>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>com.google.errorprone</groupId>
+                            <artifactId>error_prone_core</artifactId>
+                            <version>${error-prone.version}</version>
+                        </path>
+                        <path>
+                            <groupId>com.baeldung</groupId>
+                            <artifactId>my-bugchecker-plugin</artifactId>
+                            <version>1.0-SNAPSHOT</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

static-analysis/error-prone-project/src/main/java/com/baeldung/BuggyClass.java

@@ -0,0 +1,12 @@
+package com.baeldung;
+
+public class BuggyClass {
+    public static void main(String[] args) {
+        if (args.length == 0 || args[0] != null) {
+            new IllegalArgumentException();
+        }
+    }
+
+    public void emptyMethod() {
+    }
+}

static-analysis/error-prone-project/src/main/java/com/baeldung/ClassWithEmptyMethod.java

@@ -0,0 +1,6 @@
+package com.baeldung;
+
+public class ClassWithEmptyMethod {
+    public void theEmptyMethod() {
+    }
+}

static-analysis/my-bugchecker-plugin/pom.xml

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>static-analysis</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <packaging>jar</packaging>
+    <artifactId>my-bugchecker-plugin</artifactId>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>com.google.auto.service</groupId>
+                            <artifactId>auto-service</artifactId>
+                            <version>${google-auto-service.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_annotation</artifactId>
+            <version>${error-prone.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_check_api</artifactId>
+            <version>${error-prone.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.auto.service</groupId>
+            <artifactId>auto-service-annotations</artifactId>
+            <version>${google-auto-service.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

static-analysis/my-bugchecker-plugin/src/main/java/com/baeldung/EmptyMethodChecker.java

@@ -0,0 +1,24 @@
+package com.baeldung;
+
+import com.google.auto.service.AutoService;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.fixes.SuggestedFix;
+import com.google.errorprone.matchers.Description;
+import com.sun.source.tree.MethodTree;
+
+
+@AutoService(BugChecker.class)
+@BugPattern(name = "EmptyMethodCheck", summary = "Empty methods should be deleted", severity = BugPattern.SeverityLevel.ERROR)
+public class EmptyMethodChecker extends BugChecker implements BugChecker.MethodTreeMatcher {
+    @Override
+    public Description matchMethod(MethodTree methodTree, VisitorState visitorState) {
+        if (methodTree.getBody()
+          .getStatements()
+          .isEmpty()) {
+            return describeMatch(methodTree, SuggestedFix.delete(methodTree));
+        }
+        return Description.NO_MATCH;
+    }
+}

static-analysis/pmd/pom.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>static-analysis</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>pmd</artifactId>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

static-analysis/pmd/src/main/resources/customruleset.xml

@@ -1,37 +1,37 @@
-<?xml version="1.0"?>
-<ruleset name="Custom ruleset" xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd">
-
-    <description>
-    This ruleset checks my code for bad stuff
-  </description>
-
-    <!-- We'll use the entire 'strings' ruleset -->
-    <rule ref="rulesets/java/strings.xml" />
-
-    <!-- Here's some rules we'll specify one at a time -->
-    <rule ref="rulesets/java/unusedcode.xml/UnusedLocalVariable" />
-    <rule ref="rulesets/java/unusedcode.xml/UnusedPrivateField" />
-    <rule ref="rulesets/java/imports.xml/DuplicateImports" />
-    <rule ref="rulesets/java/basic.xml/UnnecessaryConversionTemporary" />
-
-    <!-- We want to customize this rule a bit, change the message and raise 
-        the priority -->
-    <rule ref="rulesets/java/basic.xml/EmptyCatchBlock" message="Must handle exceptions">
-        <priority>2</priority>
-    </rule>
-
-    <!-- Now we'll customize a rule's property value -->
-    <rule ref="rulesets/java/codesize.xml/CyclomaticComplexity">
-        <properties>
-            <property name="reportLevel" value="5" />
-        </properties>
-    </rule>
-
-    <!-- We want everything from braces.xml except WhileLoopsMustUseBraces -->
-    <rule ref="rulesets/java/braces.xml">
-        <exclude name="WhileLoopsMustUseBraces" />
-    </rule>
-
+<?xml version="1.0"?>
+<ruleset name="Custom ruleset" xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd">
+
+    <description>
+    This ruleset checks my code for bad stuff
+  </description>
+
+    <!-- We'll use the entire 'strings' ruleset -->
+    <rule ref="rulesets/java/strings.xml" />
+
+    <!-- Here's some rules we'll specify one at a time -->
+    <rule ref="rulesets/java/unusedcode.xml/UnusedLocalVariable" />
+    <rule ref="rulesets/java/unusedcode.xml/UnusedPrivateField" />
+    <rule ref="rulesets/java/imports.xml/DuplicateImports" />
+    <rule ref="rulesets/java/basic.xml/UnnecessaryConversionTemporary" />
+
+    <!-- We want to customize this rule a bit, change the message and raise 
+        the priority -->
+    <rule ref="rulesets/java/basic.xml/EmptyCatchBlock" message="Must handle exceptions">
+        <priority>2</priority>
+    </rule>
+
+    <!-- Now we'll customize a rule's property value -->
+    <rule ref="rulesets/java/codesize.xml/CyclomaticComplexity">
+        <properties>
+            <property name="reportLevel" value="5" />
+        </properties>
+    </rule>
+
+    <!-- We want everything from braces.xml except WhileLoopsMustUseBraces -->
+    <rule ref="rulesets/java/braces.xml">
+        <exclude name="WhileLoopsMustUseBraces" />
+    </rule>
+
 </ruleset>

static-analysis/pom.xml

@@ -6,6 +6,7 @@
     <artifactId>static-analysis</artifactId>
     <version>1.0-SNAPSHOT</version>
     <name>static-analysis</name>
+    <packaging>pom</packaging>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -29,4 +30,15 @@
         </plugins>
     </reporting>
 
-</project>
+    <modules>
+        <module>pmd</module>
+        <module>my-bugchecker-plugin</module>
+        <module>error-prone-project</module>
+    </modules>
+
+    <properties>
+        <error-prone.version>2.23.0</error-prone.version>
+        <google-auto-service.version>1.0.1</google-auto-service.version>
+    </properties>
+
+</project>