Merge branch 'eugenp:master' into master

core-java-modules/core-java-arrays-guides/README.md

@@ -10,3 +10,4 @@ This module contains complete guides about arrays in Java
 - [Creating a Generic Array in Java](https://www.baeldung.com/java-generic-array)
 - [Maximum Size of Java Arrays](https://www.baeldung.com/java-arrays-max-size)
 - [Merge Two Arrays and Remove Duplicates in Java](https://www.baeldung.com/java-merge-two-arrays-delete-duplicates)
+- [Print a Java 2D Array](https://www.baeldung.com/java-2d-array-print)

core-java-modules/core-java-arrays-operations-advanced-2/src/main/java/com/baeldung/equilibriumindex/EquilibriumIndexFinder.java

@@ -0,0 +1,24 @@
+package com.baeldung.equilibriumindex;
+
+import java.util.ArrayList;
+import java.util.List;
+
+class EquilibriumIndexFinder {
+    
+    List<Integer> findEquilibriumIndexes(int[] array) {
+        int[] partialSums = new int[array.length + 1];
+        partialSums[0] = 0;
+        for (int i = 0; i < array.length; i++) {
+            partialSums[i+1] = partialSums[i] + array[i]; 
+        }
+        
+        List<Integer> equilibriumIndexes = new ArrayList<Integer>();
+        for (int i = 0; i < array.length; i++) {
+            if (partialSums[i] == (partialSums[array.length] - (partialSums[i+1]))) {
+                equilibriumIndexes.add(i);
+            }
+        }
+        return equilibriumIndexes;
+    }
+
+}

core-java-modules/core-java-arrays-operations-advanced-2/src/test/java/com/baeldung/equilibriumindex/EquilibriumIndexFinderUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.equilibriumindex;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class EquilibriumIndexFinderUnitTest {
+    
+    @Test
+    void givenArrayHasEquilibriumIndexes_whenFindEquilibriumIndexes_thenListAllEquilibriumIndexes() {
+        int[] array = {1, -3, 0, 4, -5, 4, 0, 1, -2, -1};
+        assertThat(new EquilibriumIndexFinder().findEquilibriumIndexes(array)).containsExactly(1, 4, 9);
+    }
+   
+    @Test
+    void givenArrayWithoutEquilibriumIndexes_whenFindEquilibriumIndexes_thenEmptyList() {
+        int[] array = {1, 2, 3};
+        assertThat(new EquilibriumIndexFinder().findEquilibriumIndexes(array)).isEmpty();
+    }
+   
+    @Test
+    void givenArrayWithOneElement_whenFindEquilibriumIndexes_thenListFirstIndex() {
+        int[] array = {5};
+        assertThat(new EquilibriumIndexFinder().findEquilibriumIndexes(array)).containsExactly(0);
+    }
+
+}

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

@@ -6,3 +6,4 @@ This module contains articles about Java Character Class
 - [Character#isAlphabetic vs. Character#isLetter](https://www.baeldung.com/java-character-isletter-isalphabetic)
 - [Difference Between Java’s “char” and “String”](https://www.baeldung.com/java-char-vs-string)
 - [Increment Character in Java](https://www.baeldung.com/java-char-sequence)
+- [Creating Unicode Character From Its Code Point Hex String](https://www.baeldung.com/java-unicode-character-from-code-point-hex-string)

core-java-modules/core-java-concurrency-advanced-5/src/main/java/com/baeldung/countdownlatchvssemaphore/CountDownLatchDemo.java

@@ -0,0 +1,33 @@
+package com.baeldung.countdownlatchvssemaphore;
+
+import java.util.concurrent.CountDownLatch;
+
+public class CountDownLatchDemo {
+
+    public static void main(String[] args) throws InterruptedException {
+        // Create a CountDownLatch with an initial count equal to the number of tasks to be completed
+        int numberOfTasks = 3;
+        CountDownLatch latch = new CountDownLatch(numberOfTasks);
+
+        // Simulate completion of tasks by worker threads
+        for (int i = 1; i <= numberOfTasks; i++) {
+            new Thread(() -> {
+                System.out.println("Task completed by Thread " + Thread.currentThread()
+                    .getId());
+
+                // Decrement the latch count to signal completion of a task
+                latch.countDown();
+            }).start();
+        }
+
+        // Main thread waits until all tasks are completed
+        latch.await();
+        System.out.println("All tasks completed. Main thread proceeds.");
+
+        // Attempting to reset will have no effect
+        latch.countDown();
+        // Latch is already at zero, await() returns immediately
+        latch.await(); // This line won't block
+        System.out.println("Latch is already at zero and cannot be reset.");
+    }
+}

core-java-modules/core-java-concurrency-advanced-5/src/main/java/com/baeldung/countdownlatchvssemaphore/SemaphoreDemo.java

@@ -0,0 +1,42 @@
+package com.baeldung.countdownlatchvssemaphore;
+
+import java.util.concurrent.Semaphore;
+
+public class SemaphoreDemo {
+
+    public static void main(String[] args) {
+        // Create a Semaphore with a fixed number of permits
+        int NUM_PERMITS = 3;
+        Semaphore semaphore = new Semaphore(NUM_PERMITS);
+
+        // Simulate resource access by worker threads
+        for (int i = 1; i <= 5; i++) {
+            new Thread(() -> {
+                try {
+                    // Acquire a permit to access the resource
+                    semaphore.acquire();
+                    System.out.println("Thread " + Thread.currentThread().getId() + " accessing resource.");
+
+                    // Simulate resource usage
+                    Thread.sleep(2000);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                } finally {
+                    // Release the permit after resource access is complete
+                    semaphore.release();
+                }
+            }).start();
+        }
+
+        // Simulate resetting the Semaphore by releasing additional permits after a delay
+        try {
+            Thread.sleep(5000);
+
+            // Resetting the semaphore permits to the initial count
+            semaphore.release(NUM_PERMITS);
+            System.out.println("Semaphore permits reset to initial count.");
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}

core-java-modules/core-java-date-operations-4/README.md

@@ -3,4 +3,4 @@ This module contains articles about date operations in Java.
 
 ### Relevant Articles:
 - [Calculate Number of Weekdays Between Two Dates in Java](https://www.baeldung.com/java-count-weekdays-between-two-dates)
-
+- [Convert Long to Date in Java](https://www.baeldung.com/java-long-date-conversion)

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

@@ -3,4 +3,4 @@
 This module contains articles about converting between Java date and time objects.
 
 ### Relevant Articles: 
-
+- [Convert Gregorian to Hijri Date in Java](https://www.baeldung.com/java-date-gregorian-hijri-conversion)

core-java-modules/core-java-lang-6/README.md

@@ -14,3 +14,4 @@ This module contains articles about core features in the Java language
 - [Static Final Variables in Java](https://www.baeldung.com/java-static-final-variables)
 - [What Is the Error: “Non-static method cannot be referenced from a static context”?](https://www.baeldung.com/java-non-static-method-cannot-be-referenced-from-a-static-context)
 - [Recursively Sum the Integers in an Array](https://www.baeldung.com/java-recursive-sum-integer-array)
+- [Set an Environment Variable at Runtime in Java](https://www.baeldung.com/java-set-environment-variable-runtime)

core-java-modules/core-java-networking-4/src/main/java/com/baeldung/customurlconnection/CustomURLConnection.java

@@ -0,0 +1,55 @@
+package com.baeldung.customurlconnection;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URL;
+import java.net.URLConnection;
+
+public class CustomURLConnection extends URLConnection {
+    private final String simulatedData = "This is the simulated data from the resource.";
+    private URL url;
+    private boolean connected = false;
+    private String headerValue = "SimulatedHeaderValue";
+
+    protected CustomURLConnection(URL url) {
+        super(url);
+        this.url = url;
+    }
+
+    @Override
+    public void connect() throws IOException {
+        connected = true;
+        System.out.println("Connection established to: " + url);
+    }
+
+    @Override
+    public InputStream getInputStream() throws IOException {
+        if (!connected) {
+            connect();
+        }
+        return new ByteArrayInputStream(simulatedData.getBytes());
+    }
+
+    @Override
+    public OutputStream getOutputStream() throws IOException {
+        ByteArrayOutputStream simulatedOutput = new ByteArrayOutputStream();
+        return simulatedOutput;
+    }
+
+    @Override
+    public int getContentLength() {
+        return simulatedData.length();
+    }
+
+    @Override
+    public String getHeaderField(String name) {
+        if ("SimulatedHeader".equalsIgnoreCase(name)) { // Example header name
+            return headerValue;
+        } else {
+            return null; // Header not found
+        }
+    }
+}

core-java-modules/core-java-networking-4/src/main/java/com/baeldung/customurlconnection/CustomURLStreamHandler.java

@@ -0,0 +1,15 @@
+package com.baeldung.customurlconnection;
+
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+
+public class CustomURLStreamHandler extends URLStreamHandler {
+
+    @Override
+    protected URLConnection openConnection(URL u) throws IOException {
+        // Create and return an instance of CustomURLConnection
+        return new CustomURLConnection(u);
+    }
+}

core-java-modules/core-java-networking-4/src/main/java/com/baeldung/customurlconnection/CustomURLStreamHandlerFactory.java

@@ -0,0 +1,16 @@
+package com.baeldung.customurlconnection;
+
+import java.net.URLStreamHandler;
+import java.net.URLStreamHandlerFactory;
+
+public class CustomURLStreamHandlerFactory implements URLStreamHandlerFactory {
+
+    @Override
+    public URLStreamHandler createURLStreamHandler(String protocol) {
+        // Check if the requested protocol is our custom protocol
+        if ("myprotocol".equals(protocol)) {
+            return new CustomURLStreamHandler();
+        }
+        return null; // Let the default handler deal with other protocols
+    }
+}

core-java-modules/core-java-networking-4/src/main/java/com/baeldung/customurlconnection/Main.java

@@ -0,0 +1,34 @@
+package com.baeldung.customurlconnection;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Scanner;
+
+public class Main {
+
+    public static void main(String[] args) {
+        URL.setURLStreamHandlerFactory(new CustomURLStreamHandlerFactory());
+
+        try {
+            URL url = new URL("myprotocol://example.com/resource");
+
+            CustomURLConnection customConnection = (CustomURLConnection) url.openConnection();
+            customConnection.connect();
+
+            InputStream inputStream = customConnection.getInputStream();
+
+            String content = new Scanner(inputStream).useDelimiter("\\A").next();
+            System.out.println(content);
+
+            int contentLength = customConnection.getContentLength();
+            System.out.println("Content Length: " + contentLength);
+
+            String headerValue = customConnection.getHeaderField("SimulatedHeader");
+            System.out.println("Header Value: " + headerValue);
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

core-java-modules/core-java-networking-4/src/test/java/com/baeldung/urlencoder/SpaceURLEncoderUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.urlencoder;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+
+import org.junit.jupiter.api.Test;
+
+public class SpaceURLEncoderUnitTest {
+
+    @Test
+    void givenSpaceInString_whenUsingDefaultEncoding_thenReturnPlusSign() {
+        String originalString = "Welcome to the Baeldung Website!";
+        String encodedString = URLEncoder.encode(originalString);
+        assertEquals("Welcome+to+the+Baeldung+Website%21", encodedString);
+    }
+
+    @Test
+    void givenSpaceInString_whenUsingUTF8Encoding_thenReturnPlusSign() throws UnsupportedEncodingException {
+        String originalString = "Welcome to the Baeldung Website!";
+        String encodedString = URLEncoder.encode(originalString, StandardCharsets.UTF_8.toString());
+        assertEquals("Welcome+to+the+Baeldung+Website%21", encodedString);
+    }
+
+    @Test
+    void givenSpaceInString_whenUsingDefaultEncodingAndReplace_thenReturnPct20() throws UnsupportedEncodingException {
+        String originalString = "Welcome to the Baeldung Website!";
+        String encodedString = URLEncoder.encode(originalString)
+            .replace("+", "%20");
+        assertEquals("Welcome%20to%20the%20Baeldung%20Website%21", encodedString);
+    }
+
+    @Test
+    void givenSpaceInString_whenUsingDefaultEncodingAndReplaceAll_thenReturnPct20() throws UnsupportedEncodingException {
+        String originalString = "Welcome to the Baeldung Website!";
+        String encodedString = URLEncoder.encode(originalString)
+            .replaceAll("\\+", "%20");
+        assertEquals("Welcome%20to%20the%20Baeldung%20Website%21", encodedString);
+    }
+}

core-java-modules/core-java-networking-4/urlnormalization/URLNormalizationUnitTest.java

@@ -22,7 +22,7 @@ public class URLNormalizationUnitTest {
             String normalizedUri = originalUrl.split("\\?")[0];
             assertEquals(expectedNormalizedUrl, normalizedUri);
         } else {
-            throw new IllegalArgumentException("Invalid URL: " + originalUrl);
+            fail(originalUrl);
         }
     }
 
@@ -35,7 +35,7 @@ public class URLNormalizationUnitTest {
     }
 
     @Test
-    public void givenOriginalUrl_whenUsingRegularExpression_thenNormalizedUrl() throws URISyntaxException, UnsupportedEncodingException {
+    public void givenOriginalUrl_whenUsingRegularExpression_thenNormalizedUrl() {
         String regex = "^(https?://[^/]+/[^?#]+)";
         Pattern pattern = Pattern.compile(regex);
         Matcher matcher = pattern.matcher(originalUrl);
@@ -44,7 +44,7 @@ public class URLNormalizationUnitTest {
             String normalizedUrl = matcher.group(1);
             assertEquals(expectedNormalizedUrl, normalizedUrl);
         } else {
-            throw new IllegalArgumentException("Invalid URL: " + originalUrl);
+            fail(originalUrl);
         }
     }
 }

core-java-modules/core-java-reflection-3/src/main/java/com/baeldung/reflection/innerclass/Person.java

@@ -0,0 +1,20 @@
+package com.baeldung.reflection.innerclass;
+
+public class Person {
+    String name;
+    Address address;
+
+    public Person() {
+    }
+
+    public class Address {
+        String zip;
+
+        public Address(String zip) {
+            this.zip = zip;
+        }
+    }
+
+    public static class Builder {
+    }
+}

core-java-modules/core-java-reflection-3/src/test/java/com/baeldung/reflection/innerclass/CreateInnerClassWithReflectionUnitTest.java

@@ -0,0 +1,67 @@
+package com.baeldung.reflection.innerclass;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Arrays;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CreateInnerClassWithReflectionUnitTest {
+
+    static Logger logger = LoggerFactory.getLogger(CreateInnerClassWithReflectionUnitTest.class);
+
+    @Test
+    void givenInnerClass_whenUseReflection_thenShowConstructors() {
+        final String personBuilderClassName = "com.baeldung.reflection.innerclass.Person$Builder";
+        final String personAddressClassName = "com.baeldung.reflection.innerclass.Person$Address";
+        assertDoesNotThrow(() -> logConstructors(Class.forName(personAddressClassName)));
+        assertDoesNotThrow(() -> logConstructors(Class.forName(personBuilderClassName)));
+    }
+
+    private static void logConstructors(Class<?> clazz) {
+        Arrays.stream(clazz.getDeclaredConstructors())
+            .map(c -> formatConstructorSignature(c))
+            .forEach(logger::info);
+    }
+
+    private static String formatConstructorSignature(Constructor<?> constructor) {
+        String params = Arrays.stream(constructor.getParameters())
+            .map(parameter -> parameter.getType().getSimpleName() + " " + parameter.getName())
+            .collect(Collectors.joining(", "));
+        return constructor.getName() + "(" + params + ")";
+    }
+
+    @Test
+    void givenStaticInnerClass_whenUseReflection_thenInstantiate()
+        throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
+            InstantiationException, IllegalAccessException {
+        final String personBuilderClassName = "com.baeldung.reflection.innerclass.Person$Builder";
+        Class<Person.Builder> personBuilderClass = (Class<Person.Builder>) Class.forName(personBuilderClassName);
+        Person.Builder personBuilderObj = personBuilderClass.getDeclaredConstructor().newInstance();
+        assertTrue(personBuilderObj instanceof Person.Builder);
+    }
+
+    @Test
+    void givenNonStaticInnerClass_whenUseReflection_thenInstantiate()
+        throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
+            InstantiationException, IllegalAccessException {
+        final String personClassName = "com.baeldung.reflection.innerclass.Person";
+        final String personAddressClassName = "com.baeldung.reflection.innerclass.Person$Address";
+
+        Class<Person> personClass = (Class<Person>) Class.forName(personClassName);
+        Person personObj = personClass.getConstructor().newInstance();
+
+        Class<Person.Address> personAddressClass = (Class<Person.Address>) Class.forName(personAddressClassName);
+
+        assertThrows(NoSuchMethodException.class, () -> personAddressClass.getDeclaredConstructor(String.class));
+
+        Constructor<Person.Address> constructorOfPersonAddress = personAddressClass.getDeclaredConstructor(Person.class, String.class);
+        Person.Address personAddressObj = constructorOfPersonAddress.newInstance(personObj, "751003");
+        assertTrue(personAddressObj instanceof Person.Address);
+    }
+
+}

core-java-modules/core-java-streams/src/test/java/com/baeldung/stream/range/StreamRangeUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.stream.range;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class StreamRangeUnitTest {
+
+    @Test
+    public void whenRangeStreamUsingLimitSkip_thenPrintsRange() {
+        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> expectedRange = Arrays.asList(3, 4, 5, 6, 7);
+
+        List<Integer> range = numbers.stream()
+                .skip(2)
+                .limit(5)
+                .collect(Collectors.toList());
+
+        assertEquals(expectedRange, range);
+    }
+
+    @Test
+    public void whenRangeStreamUsingCollectingAndThen_thenPrintsRange() {
+        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> expectedRange = Arrays.asList(3, 4, 5, 6, 7);
+
+        List<Integer> range = numbers.stream()
+                .filter(n -> n >= 3 && n <= 7)
+                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
+
+        assertEquals(expectedRange, range);
+    }
+}

core-java-modules/core-java-string-algorithms-4/src/test/java/com/baeldung/string/runlength/RunLengthEncodingUnitTest.java

@@ -0,0 +1,93 @@
+package com.baeldung.string.runlength;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Collections;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class RunLengthEncodingUnitTest {
+    private static final String INPUT = "WWWWWWWWWWWWBAAACCDEEEEE";
+    private static final String RLE = "12W1B3A2C1D5E";
+
+    String runLengthEncode(String input) {
+        StringBuilder result = new StringBuilder();
+        int count = 1;
+        char[] chars = input.toCharArray();
+        for (int i = 0; i < chars.length; i++) {
+            char c = chars[i];
+            if (i + 1 < chars.length && c == chars[i + 1]) {
+                count++;
+            } else {
+                result.append(count).append(c);
+                count = 1;
+            }
+        }
+        return result.toString();
+    }
+
+
+    String runLengthDecode(String rle) {
+        StringBuilder result = new StringBuilder();
+        char[] chars = rle.toCharArray();
+
+        int count = 0;
+        for (char c : chars) {
+            if (Character.isDigit(c)) {
+                count = 10 * count + Character.getNumericValue(c);
+            } else {
+                result.append(String.join("", Collections.nCopies(count, String.valueOf(c))));
+                count = 0;
+            }
+        }
+        return result.toString();
+    }
+
+    String runLengthEncodeByRegEx(String input) {
+        String[] arr = input.split("(?<=(\\D))(?!\\1)");
+        StringBuilder result = new StringBuilder();
+        for (String run : arr) {
+            result.append(run.length()).append(run.charAt(0));
+        }
+        return result.toString();
+    }
+
+    String runLengthDecodeByRegEx(String rle) {
+        if (rle.isEmpty()) {
+            return "";
+        }
+        String[] arr = rle.split("(?<=\\D)|(?=\\D+)");
+        if (arr.length % 2 != 0) {
+            throw new IllegalArgumentException("Not a RLE string");
+        }
+        StringBuilder result = new StringBuilder();
+
+        for (int i = 1; i <= arr.length; i += 2) {
+            int count = Integer.parseInt(arr[i - 1]);
+            String c = arr[i];
+
+            result.append(String.join("", Collections.nCopies(count, c)));
+        }
+        return result.toString();
+    }
+
+    @Test
+    void whenInvokingRunLengthEncode_thenGetExpectedResult() {
+        assertEquals(RLE, runLengthEncode(INPUT));
+    }
+
+    @Test
+    void whenInvokingRunLengthDecode_thenGetExpectedResult() {
+        assertEquals(INPUT, runLengthDecode(RLE));
+    }
+
+    @Test
+    void whenInvokingRunLengthEncodeByRegEx_thenGetExpectedResult() {
+        assertEquals(RLE, runLengthEncodeByRegEx(INPUT));
+    }
+
+    @Test
+    void whenInvokingRunLengthDecodeByRegEx_thenGetExpectedResult() {
+        assertEquals(INPUT, runLengthDecodeByRegEx(RLE));
+    }
+}

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

@@ -14,3 +14,4 @@
 - [UTF-8 Validation in Java](https://www.baeldung.com/java-utf-8-validation)
 - [Simple Morse Code Translation in Java](https://www.baeldung.com/java-morse-code-english-translate)
 - [How to Determine if a String Contains Invalid Encoded Characters](https://www.baeldung.com/java-check-string-contains-invalid-encoded-characters)
+- [Regular Expression for Password Validation in Java](https://www.baeldung.com/java-regex-password-validation)

core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/DecodeUUIDStringFromBase64UnitTest.java

@@ -14,7 +14,7 @@ public class DecodeUUIDStringFromBase64UnitTest {
     private final UUID originalUUID = UUID.fromString("cc5f93f7-8cf1-4a51-83c6-e740313a0c6c");
 
     @Test
-    public void shouldDecodeUUIDUsingByteArrayAndBase64Decoder() {
+    public void givenEncodedString_whenDecodingUsingBase64Decoder_thenGiveExpectedUUID() {
         String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] decodedBytes = Base64.getDecoder()
           .decode(expectedEncodedString);
@@ -23,7 +23,7 @@ public class DecodeUUIDStringFromBase64UnitTest {
     }
 
     @Test
-    public void shouldDecodeUUIDUsingByteBufferAndBase64UrlDecoder() {
+    public void givenEncodedString_whenDecodingUsingByteBufferAndBase64UrlDecoder_thenGiveExpectedUUID() {
         String expectedEncodedString = "zF-T94zxSlGDxudAMToMbA";
         byte[] decodedBytes = Base64.getUrlDecoder()
           .decode(expectedEncodedString);
@@ -35,7 +35,7 @@ public class DecodeUUIDStringFromBase64UnitTest {
     }
 
     @Test
-    public void shouldDecodeUUIDUsingApacheUtils() {
+    public void givenEncodedString_whenDecodingUsingApacheUtils_thenGiveExpectedUUID() {
         String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] decodedBytes = decodeBase64(expectedEncodedString);
         UUID uuid = Conversion.byteArrayToUuid(decodedBytes, 0);

core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/EncodeUUIDToBase64StringUnitTest.java

@@ -14,7 +14,7 @@ public class EncodeUUIDToBase64StringUnitTest {
     private final UUID originalUUID = UUID.fromString("cc5f93f7-8cf1-4a51-83c6-e740313a0c6c");
 
     @Test
-    public void shouldEncodeUUIDUsingByteArrayAndBase64Encoder() {
+    public void givenUUID_whenEncodingUsingBase64Encoder_thenGiveExpectedEncodedString() {
         String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] uuidBytes = convertToByteArray(originalUUID);
         String encodedUUID = Base64.getEncoder().withoutPadding()
@@ -23,7 +23,7 @@ public class EncodeUUIDToBase64StringUnitTest {
     }
 
     @Test
-    public void shouldEncodeUUIDUsingByteBufferAndBase64UrlEncoder() {
+    public void givenUUID_whenEncodingUsingByteBufferAndBase64UrlEncoder_thenGiveExpectedEncodedString() {
         String expectedEncodedString = "zF-T94zxSlGDxudAMToMbA";
         ByteBuffer byteBuffer = ByteBuffer.wrap(new byte[16]);
         byteBuffer.putLong(originalUUID.getMostSignificantBits());
@@ -34,7 +34,7 @@ public class EncodeUUIDToBase64StringUnitTest {
     }
 
     @Test
-    public void shouldEncodeUUIDUsingApacheUtils() {
+    public void givenUUID_whenEncodingUsingApacheUtils_thenGiveExpectedEncodedString() {
         String expectedEncodedString = "UUrxjPeTX8xsDDoxQOfGgw";
         byte[] bytes = Conversion.uuidToByteArray(originalUUID, new byte[16], 0, 16);
         String encodedUUID = encodeBase64URLSafeString(bytes);

logging-modules/logging-techniques/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [Structured Logging in Java](https://www.baeldung.com/java-structured-logging)

maven-modules/maven-exec-plugin/pom.xml

@@ -8,6 +8,36 @@
     <version>0.0.1-SNAPSHOT</version>
     <name>maven-exec-plugin</name>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-invoker</artifactId>
+            <version>${apache.maven.invoker.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-embedder</artifactId>
+            <version>${apache.maven.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
     <build>
         <plugins>
             <plugin>
@@ -38,6 +68,9 @@
     <properties>
         <maven-compiler-plugin.version>3.12.1</maven-compiler-plugin.version>
         <exec-maven-plugin.version>3.1.0</exec-maven-plugin.version>
+        <junit.jupiter.version>5.10.0</junit.jupiter.version>
+        <apache.maven.version>3.9.6</apache.maven.version>
+        <apache.maven.invoker.version>3.2.0</apache.maven.invoker.version>
     </properties>
 
 </project>

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/JavaVersion.java

@@ -0,0 +1,17 @@
+package com.baeldung.learningplatform;
+
+public enum JavaVersion {
+
+    JAVA_8("1.8"), JAVA_9("9"), JAVA_17("17");
+
+    private final String version;
+
+
+    JavaVersion(String version) {
+        this.version = version;
+    }
+
+    public String getVersion() {
+        return this.version;
+    }
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/Maven.java

@@ -0,0 +1,13 @@
+package com.baeldung.learningplatform;
+
+import java.nio.file.Path;
+
+public interface Maven {
+    String POM_XML = "pom.xml";
+    String COMPILE_GOAL = "compile";
+    String USE_CUSTOM_POM = "-f";
+    int OK = 0;
+    String MVN = "mvn";
+
+    void compile(Path projectFolder);
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/MavenCompilationException.java

@@ -0,0 +1,12 @@
+package com.baeldung.learningplatform;
+
+public class MavenCompilationException extends RuntimeException {
+
+    public MavenCompilationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public MavenCompilationException(String message) {
+        super(message);
+    }
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/MavenEmbedder.java

@@ -0,0 +1,16 @@
+package com.baeldung.learningplatform;
+
+import java.nio.file.Path;
+import org.apache.maven.cli.MavenCli;
+
+public class MavenEmbedder implements Maven {
+
+    public static final String MVN_HOME = "maven.multiModuleProjectDirectory";
+
+    @Override
+    public void compile(Path projectFolder) {
+        MavenCli cli = new MavenCli();
+        System.setProperty(MVN_HOME, projectFolder.toString());
+        cli.doMain(new String[]{COMPILE_GOAL}, projectFolder.toString(), null, null);
+    }
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/MavenExecutorAdapter.java

@@ -0,0 +1,26 @@
+package com.baeldung.learningplatform;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+public abstract class MavenExecutorAdapter implements Maven {
+
+    @Override
+    public void compile(Path projectFolder) {
+        int exitCode;
+        try {
+            exitCode = execute(projectFolder, COMPILE_GOAL);
+        } catch (InterruptedException e) {
+            throw new MavenCompilationException("Interrupted during compilation", e);
+        } catch (IOException e) {
+            throw new MavenCompilationException("Incorrect execution", e);
+        }
+        if (exitCode != OK) {
+            throw new MavenCompilationException("Failure during compilation: " + exitCode);
+        }
+    }
+
+    protected abstract int execute(Path projectFolder, String compileGoal)
+      throws InterruptedException, IOException;
+
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/MavenInvoker.java

@@ -0,0 +1,30 @@
+package com.baeldung.learningplatform;
+
+import java.nio.file.Path;
+import java.util.Collections;
+import org.apache.maven.shared.invoker.DefaultInvocationRequest;
+import org.apache.maven.shared.invoker.DefaultInvoker;
+import org.apache.maven.shared.invoker.InvocationRequest;
+import org.apache.maven.shared.invoker.InvocationResult;
+import org.apache.maven.shared.invoker.Invoker;
+import org.apache.maven.shared.invoker.MavenInvocationException;
+
+public class MavenInvoker implements Maven {
+
+    @Override
+    public void compile(Path projectFolder) {
+        InvocationRequest request = new DefaultInvocationRequest();
+        request.setPomFile(projectFolder.resolve(POM_XML).toFile());
+        request.setGoals(Collections.singletonList(Maven.COMPILE_GOAL));
+        Invoker invoker = new DefaultInvoker();
+        try {
+            InvocationResult result = invoker.execute(request);
+            if (result.getExitCode() != 0) {
+                throw new MavenCompilationException("Build failed", result.getExecutionException());
+            }
+        } catch (MavenInvocationException e) {
+            throw new MavenCompilationException("Exception during Maven invocation", e);
+        }
+
+    }
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/MavenProcessBuilder.java

@@ -0,0 +1,15 @@
+package com.baeldung.learningplatform;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+public class MavenProcessBuilder extends MavenExecutorAdapter {
+    private static final ProcessBuilder PROCESS_BUILDER = new ProcessBuilder();
+
+    protected int execute(Path projectFolder, String compileGoal) throws IOException, InterruptedException {
+        Process process = PROCESS_BUILDER
+          .command(MVN, USE_CUSTOM_POM, projectFolder.resolve(POM_XML).toString(), compileGoal)
+          .start();
+        return process.waitFor();
+    }
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/MavenRuntimeExec.java

@@ -0,0 +1,13 @@
+package com.baeldung.learningplatform;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+public class MavenRuntimeExec extends MavenExecutorAdapter {
+    @Override
+    protected int execute(Path projectFolder, String compileGoal) throws InterruptedException, IOException {
+        String[] arguments = {MVN, USE_CUSTOM_POM, projectFolder.resolve(POM_XML).toString(), COMPILE_GOAL};
+        Process process = Runtime.getRuntime().exec(arguments);
+        return process.waitFor();
+    }
+}

maven-modules/maven-exec-plugin/src/main/java/com/baeldung/learningplatform/ProjectBuilder.java

@@ -0,0 +1,100 @@
+package com.baeldung.learningplatform;
+
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import org.apache.maven.model.Build;
+import org.apache.maven.model.Dependency;
+import org.apache.maven.model.Model;
+import org.apache.maven.model.Plugin;
+import org.apache.maven.model.io.xpp3.MavenXpp3Writer;
+import org.codehaus.plexus.util.xml.Xpp3Dom;
+
+public class ProjectBuilder {
+
+    private static final String PACKAGE = "package ";
+    private static final String POM_XML = "pom.xml";
+    private static final String SRC_TEST = "src/test/";
+    private static final String SRC_MAIN_JAVA = "src/main/java/";
+    private static final String PACKAGE_DELIMITER = ".";
+    private static final String MAIN_JAVA = "Main.java";
+    private final List<Dependency> dependencies = new ArrayList<>();
+    private JavaVersion javaVersion = JavaVersion.JAVA_8;
+
+    public ProjectBuilder addDependency(String groupId, String artifactId, String version) {
+        Dependency dependency = new Dependency();
+        dependency.setGroupId(groupId);
+        dependency.setArtifactId(artifactId);
+        dependency.setVersion(version);
+        dependencies.add(dependency);
+        return this;
+    }
+
+    public ProjectBuilder setJavaVersion(JavaVersion version) {
+        this.javaVersion = version;
+        return this;
+    }
+
+    public void build(String userName, Path projectPath, String packageName) throws IOException {
+        Model model = new Model();
+        configureModel(userName, model);
+        dependencies.forEach(model::addDependency);
+        Build build = configureJavaVersion();
+        model.setBuild(build);
+        MavenXpp3Writer writer = new MavenXpp3Writer();
+        writer.write(new FileWriter(projectPath.resolve(POM_XML).toFile()), model);
+        generateFolders(projectPath, SRC_TEST);
+
+        Path generatedPackage = generateFolders(projectPath,
+          SRC_MAIN_JAVA +
+          packageName.replace(PACKAGE_DELIMITER, FileSystems.getDefault().getSeparator()));
+        String generatedClass = generateMainClass(PACKAGE + packageName);
+        Files.writeString(generatedPackage.resolve(MAIN_JAVA), generatedClass);
+    }
+
+    private static void configureModel(String userName, Model model) {
+        model.setModelVersion("4.0.0");
+        model.setArtifactId("com." + userName.toLowerCase());
+        model.setGroupId("learning-project");
+        model.setVersion("0.0.1-SNAPSHOT");
+    }
+
+    private static String generateMainClass(String packageName) {
+        return packageName + ";\n" +
+               "\n" +
+               "public class Main {\n" +
+               "    public static void main(String[] args){\n" +
+               "      System.out.println(\"Hello World!\");\n" +
+               "    }\n" +
+               "}\n";
+    }
+
+    private static Path generateFolders(Path sourceFolder, String packageName) throws IOException {
+        return Files.createDirectories(sourceFolder.resolve(packageName));
+    }
+
+    private Build configureJavaVersion() {
+        Plugin plugin = new Plugin();
+        plugin.setGroupId("org.apache.maven.plugins");
+        plugin.setArtifactId("maven-compiler-plugin");
+        plugin.setVersion("3.8.1");
+
+        Xpp3Dom configuration = new Xpp3Dom("configuration");
+        Xpp3Dom source = new Xpp3Dom("source");
+        source.setValue(javaVersion.getVersion());
+        Xpp3Dom target = new Xpp3Dom("target");
+        target.setValue(javaVersion.getVersion());
+        configuration.addChild(source);
+        configuration.addChild(target);
+
+        plugin.setConfiguration(configuration);
+
+        Build build = new Build();
+        build.addPlugin(plugin);
+        return build;
+    }
+}

maven-modules/maven-exec-plugin/src/test/java/com/baeldung/learningplatform/FileUtil.java

@@ -0,0 +1,32 @@
+package com.baeldung.learningplatform;
+
+import java.io.IOException;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
+
+public class FileUtil {
+
+    private FileUtil() {
+    }
+
+    public static void removeDirectoryRecursively(Path folder) throws IOException {
+        if (Files.exists(folder)) {
+            Files.walkFileTree(folder, new SimpleFileVisitor<>() {
+                @Override
+                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                    Files.delete(file);
+                    return FileVisitResult.CONTINUE;
+                }
+
+                @Override
+                public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
+                    Files.delete(dir);
+                    return FileVisitResult.CONTINUE;
+                }
+            });
+        }
+    }
+}

maven-modules/maven-exec-plugin/src/test/java/com/baeldung/learningplatform/MavenRuntimeExecUnitTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.learningplatform;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class MavenRuntimeExecUnitTest {
+
+    private static final String PACKAGE_NAME = "com.baeldung.generatedcode";
+    private static final String USER_NAME = "john_doe";
+    @TempDir
+    private Path tempDir;
+
+    @BeforeEach
+    public void setUp() throws IOException {
+        ProjectBuilder projectBuilder = new ProjectBuilder();
+        projectBuilder.build(USER_NAME, tempDir, PACKAGE_NAME);
+    }
+
+    @ParameterizedTest
+    @MethodSource
+    void givenMavenInterface_whenCompileMavenProject_thenCreateTargetDirectory(Maven maven) {
+        maven.compile(tempDir);
+        assertTrue(Files.exists(tempDir));
+    }
+
+    static Stream<Maven> givenMavenInterface_whenCompileMavenProject_thenCreateTargetDirectory() {
+        return Stream.of(
+          new MavenRuntimeExec(),
+          new MavenProcessBuilder(),
+          new MavenEmbedder(),
+          new MavenInvoker());
+    }
+}

maven-modules/maven-exec-plugin/src/test/java/com/baeldung/learningplatform/ProjectsPaths.java

@@ -0,0 +1,11 @@
+package com.baeldung.learningplatform;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public interface ProjectsPaths {
+
+    public static final Path PROJECT_DIR = Paths.get("src/test/resources/learning-project/");
+    public static final Path PROJECT_POM_XML = PROJECT_DIR.resolve("pom.xml");
+    public static final Path PROJECT_TARGET = PROJECT_DIR.resolve("target");
+}

messaging-modules/rabbitmq/src/test/java/com/baeldung/benchmark/ConnectionPerChannelPublisherLiveTest.java

@@ -12,7 +12,7 @@ class ConnectionPerChannelPublisherLiveTest {
         // host, workerCount, iterations, payloadSize
         Stream.of(1,5,10,20,50,100,150)
           .forEach(workers -> {
-              ConnectionPerChannelPublisher.main(new String[]{"192.168.99.100", Integer.toString(workers), "1000", "4096"});
+              ConnectionPerChannelPublisher.main(new String[]{"localhost", Integer.toString(workers), "1000", "4096"});
           });
     }
 

messaging-modules/rabbitmq/src/test/java/com/baeldung/benchmark/SingleConnectionPublisherLiveTest.java

@@ -10,9 +10,9 @@ class SingleConnectionPublisherLiveTest {
     @Test
     void whenSingleChannel_thenRunBenchmark() throws Exception {
         // host, workerCount, iterations, payloadSize        
-        Stream.of(1,5,10,20,50,100,150)
+        Stream.of(1,5,10,20,50)
           .forEach(workers -> {
-              SingleConnectionPublisher.main(new String[]{"192.168.99.100", Integer.toString(workers), "1000", "4096"});
+              SingleConnectionPublisher.main(new String[]{"localhost", Integer.toString(workers), "1000", "4096"});
           });
     }
 

messaging-modules/rabbitmq/src/test/java/com/baeldung/benchmark/queue/dynamic/DynamicQueueCreationLiveTest.java

@@ -56,11 +56,17 @@ public class DynamicQueueCreationLiveTest {
 
     @Test
     void givenQueueName_whenQueueDoesNotExist_thenCheckingIfQueueExists() throws IOException, TimeoutException {
-
+        Channel temp = null;
-        try (Channel channel = connection.createChannel()) {
+        try  {
+            Channel channel = connection.createChannel();
             assertThrows(IOException.class, () -> {
                 channel.queueDeclarePassive(QUEUE_NAME_NEW);
             });
+            temp = channel;
+        } finally {
+            if(temp != null && temp.isOpen()) {
+                temp.close();
+            }
         }
     }
 

microservices-modules/micronaut-reactive/pom.xml

@@ -11,6 +11,7 @@
         <groupId>io.micronaut.platform</groupId>
         <artifactId>micronaut-parent</artifactId>
         <version>4.1.2</version>
+        <relativePath/>
     </parent>
     <properties>
         <packaging>jar</packaging>

patterns-modules/monkey-patching/README.md

@@ -1 +1,2 @@
 ### Relevant Articles:
+- [Monkey Patching in Java](https://www.baeldung.com/java-monkey-patching)

persistence-modules/core-java-persistence-3/pom.xml

@@ -6,6 +6,18 @@
     <artifactId>core-java-persistence-3</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-persistence-3</name>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <packaging>jar</packaging>
 
     <parent>

persistence-modules/core-java-persistence-3/src/main/java/jdbcpagination/PaginationLogic.java

@@ -0,0 +1,33 @@
+package jdbcpagination;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class PaginationLogic {
+
+    public static ResultSet readPageWithLimitAndOffset(Connection connection, int offset, int pageSize) throws SQLException {
+        String sql = """
+             SELECT * FROM employees
+             LIMIT ? OFFSET ?
+            """;
+        PreparedStatement preparedStatement = connection.prepareStatement(sql);
+        preparedStatement.setInt(1, pageSize);
+        preparedStatement.setInt(2, offset);
+
+        return preparedStatement.executeQuery();
+    }
+
+    public static ResultSet readPageWithSortedKeys(Connection connection, int lastFetchedId, int pageSize) throws SQLException {
+        String sql = """
+             SELECT * FROM employees
+             WHERE id > ? LIMIT ?
+            """;
+        PreparedStatement preparedStatement = connection.prepareStatement(sql);
+        preparedStatement.setInt(1, lastFetchedId);
+        preparedStatement.setInt(2, pageSize);
+
+        return preparedStatement.executeQuery();
+    }
+}

persistence-modules/core-java-persistence-3/src/test/java/jdbcpagination/PaginationLogicUnitTest.java

@@ -0,0 +1,134 @@
+package jdbcpagination;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.IntStream;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+public class PaginationLogicUnitTest {
+    private static Connection connection = null;
+    private static final String JDBC_URL = "jdbc:h2:mem:testDB";
+    private static final String USERNAME = "dbUser";
+    private static final String PASSWORD = "dbPassword";
+
+    @BeforeAll
+    public static void setup() throws Exception {
+        connection = connect(JDBC_URL, USERNAME, PASSWORD);
+        populateDB();
+    }
+
+    @AfterAll
+    public static void tearDown() throws SQLException {
+        destroyDB();
+    }
+
+    @Test
+    public void givenDBPopulated_WhenReadPaginatedWithLimitAndOffset_ThenReturnsPaginatedResult() throws SQLException {
+        int offset = 0;  // offset is set to 0 and keep updating with pageSize
+        int pageSize = 100_000;
+        int totalPages = 0;
+        while (true) {
+            ResultSet resultSet = PaginationLogic.readPageWithLimitAndOffset(connection, offset, pageSize);
+            if (!resultSet.next())
+                break;
+            List<String> resultPage = new ArrayList<>();
+
+            do {
+                resultPage.add(resultSet.getString("first_name"));
+            } while (resultSet.next());
+            assertEquals("firstname" + (resultPage.size() * (totalPages + 1)), resultPage.get(resultPage.size() - 1));
+            offset += pageSize;
+            totalPages++;
+        }
+        assertEquals(10, totalPages);
+    }
+
+    @Test
+    public void givenDBPopulated_WhenReadPaginatedWithSortedKeys_ThenReturnsPaginatedResult() throws SQLException {
+        // find min and max ID
+        PreparedStatement preparedStatement = connection.prepareStatement("SELECT min(id) as min_id, max(id) as max_id FROM employees");
+        ResultSet resultSet = preparedStatement.executeQuery();
+        resultSet.next();
+
+        int minId = resultSet.getInt("min_id");
+        int maxId = resultSet.getInt("max_id");
+        int lastFetchedId = 0; // assign lastFetchedId to minId
+
+        int pageSize = 100_000;
+        int totalPages = 0;
+
+        while ((lastFetchedId + pageSize) <= maxId) {
+            resultSet = PaginationLogic.readPageWithSortedKeys(connection, lastFetchedId, pageSize);
+            if (!resultSet.next())
+                break;
+            List<String> resultPage = new ArrayList<>();
+            do {
+                resultPage.add(resultSet.getString("first_name"));
+                lastFetchedId = resultSet.getInt("id");
+            } while (resultSet.next());
+            assertEquals("firstname" + (resultPage.size() * (totalPages + 1)), resultPage.get(resultPage.size() - 1));
+            totalPages++;
+        }
+        assertEquals(10, totalPages);
+    }
+
+    private static void destroyDB() throws SQLException {
+        String destroy = """
+              DROP table IF EXISTS EMPLOYEES;
+            """;
+        connection.prepareStatement(destroy)
+            .execute();
+    }
+
+    private static void populateDB() throws SQLException {
+        String createTable = """
+            CREATE TABLE EMPLOYEES (
+                id SERIAL PRIMARY KEY,
+                first_name VARCHAR(50),
+                last_name VARCHAR(50),
+                salary DECIMAL(10, 2)
+            );
+            """;
+        PreparedStatement preparedStatement = connection.prepareStatement(createTable);
+        preparedStatement.execute();
+
+        String load = """
+            INSERT INTO EMPLOYEES (first_name, last_name, salary)
+            VALUES(?,?,?)
+            """;
+        IntStream.rangeClosed(1, 1_000_000)
+            .forEach(i -> {
+                PreparedStatement preparedStatement1 = null;
+                try {
+                    preparedStatement1 = connection.prepareStatement(load);
+                    preparedStatement1.setString(1, "firstname" + i);
+                    preparedStatement1.setString(2, "lastname" + i);
+                    preparedStatement1.setDouble(3, 100_000 + (1_000_000 - 100_000) + Math.random());
+
+                    preparedStatement1.execute();
+                } catch (SQLException e) {
+                    throw new RuntimeException(e);
+                }
+            });
+    }
+
+    public static Connection connect(String url, String user, String password) throws SQLException {
+        Connection connection = DriverManager.getConnection(url, user, password);
+        if (connection != null) {
+            System.out.println("Connected to database");
+        }
+
+        return connection;
+    }
+
+}

persistence-modules/pom.xml

@@ -102,7 +102,7 @@
         <module>spring-data-solr</module>
         <module>spring-data-shardingsphere</module>
         <module>spring-hibernate-3</module>
-        <!-- <module>spring-hibernate-5</module> FAILED --> <!-- long running -->
+        <module>spring-hibernate-5</module>
         <module>spring-hibernate-6</module>
         <module>spring-jpa</module>
         <module>spring-jpa-2</module>

persistence-modules/spring-boot-persistence-4/README.md

@@ -1,3 +1,4 @@
 ## Relevant Articles
 - [Scroll API in Spring Data JPA](https://www.baeldung.com/spring-data-jpa-scroll-api)
 - [List vs. Set in @OneToMany JPA](https://www.baeldung.com/spring-jpa-onetomany-list-vs-set)
+- [N+1 Problem in Hibernate and Spring Data JPA](https://www.baeldung.com/spring-hibernate-n1-problem)

persistence-modules/spring-data-jpa-repo-4/README.md

@@ -6,4 +6,5 @@
 - [TRUNCATE TABLE in Spring Data JPA](https://www.baeldung.com/spring-data-jpa-truncate-table)
 - [When to Use the getReferenceById() and findById() Methods in Spring Data JPA](https://www.baeldung.com/spring-data-jpa-getreferencebyid-findbyid-methods)
 - [Implementing Persistable-Only Entities in Spring Data JPA](https://www.baeldung.com/spring-data-persistable-only-entities)
+- [Storing PostgreSQL JSONB Using Spring Boot and JPA](https://www.baeldung.com/spring-boot-jpa-storing-postgresql-jsonb)
 - More articles: [[<-- prev]](../spring-data-jpa-repo-3)

persistence-modules/spring-hibernate-5/pom.xml

@@ -125,6 +125,20 @@
         </dependency>
     </dependencies>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <argLine>
+                        --add-opens java.base/java.lang=ALL-UNNAMED
+                    </argLine>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
     <properties>
         <!-- Spring -->
         <org.springframework.version>5.0.2.RELEASE</org.springframework.version>
@@ -132,7 +146,7 @@
         <org.springframework.security.version>4.2.1.RELEASE</org.springframework.security.version>
         <!-- persistence -->
         <hibernate.version>5.6.15.Final</hibernate.version>
-        <hibernatesearch.version>5.8.2.Final</hibernatesearch.version>
+        <hibernatesearch.version>5.11.12.Final</hibernatesearch.version>
         <mysql-connector-java.version>8.2.0</mysql-connector-java.version>
         <tomcat-dbcp.version>9.0.0.M26</tomcat-dbcp.version>
         <jta.version>1.1</jta.version>

persistence-modules/spring-hibernate-5/src/main/resources/ehcache.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ehcache xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true"
+    monitoring="autodetect" dynamicConfig="true">
+
+    <diskStore path="java.io.tmpdir/ehcache" />
+
+    <defaultCache maxEntriesLocalHeap="10000" eternal="false"
+        timeToIdleSeconds="120" timeToLiveSeconds="120" diskSpoolBufferSizeMB="30"
+        maxEntriesLocalDisk="10000000" diskExpiryThreadIntervalSeconds="120"
+        memoryStoreEvictionPolicy="LRU" statistics="true">
+        <persistence strategy="localTempSwap" />
+    </defaultCache>
+
+    <cache name="org.hibernate.cache.internal.StandardQueryCache"
+        maxEntriesLocalHeap="5" eternal="false" timeToLiveSeconds="120">
+        <persistence strategy="localTempSwap" />
+    </cache>
+
+</ehcache>

persistence-modules/spring-hibernate-5/src/test/java/com/baeldung/persistence/deletion/model/Fooo.java

@@ -7,13 +7,13 @@ import javax.persistence.*;
 @Entity
 @Table(name = "FOO")
 @Where(clause = "DELETED = 0")
-public class Foo {
+public class Fooo {
 
-    public Foo() {
+    public Fooo() {
         super();
     }
 
-    public Foo(final String name) {
+    public Fooo(final String name) {
         super();
         this.name = name;
     }

persistence-modules/spring-hibernate-5/src/test/java/com/baeldung/persistence/service/DeletionIntegrationTest.java

@@ -14,7 +14,7 @@ import org.springframework.transaction.annotation.Transactional;
 import com.baeldung.persistence.deletion.config.PersistenceJPAConfigDeletion;
 import com.baeldung.persistence.deletion.model.Bar;
 import com.baeldung.persistence.deletion.model.Baz;
-import com.baeldung.persistence.deletion.model.Foo;
+import com.baeldung.persistence.deletion.model.Fooo;
 
 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
@@ -41,29 +41,29 @@ public class DeletionIntegrationTest {
     @Test
     @Transactional
     public final void givenEntityIsRemoved_thenItIsNotInDB() {
-        Foo foo = new Foo("foo");
+        Fooo fooo = new Fooo("foo");
-        entityManager.persist(foo);
+        entityManager.persist(fooo);
         flushAndClear();
 
-        foo = entityManager.find(Foo.class, foo.getId());
+        fooo = entityManager.find(Fooo.class, fooo.getId());
-        assertThat(foo, notNullValue());
+        assertThat(fooo, notNullValue());
 
-        entityManager.remove(foo);
+        entityManager.remove(fooo);
         flushAndClear();
 
-        assertThat(entityManager.find(Foo.class, foo.getId()), nullValue());
+        assertThat(entityManager.find(Fooo.class, fooo.getId()), nullValue());
     }
 
     @Test
     @Transactional
     public final void givenEntityIsRemovedAndReferencedByAnotherEntity_thenItIsNotRemoved() {
         Bar bar = new Bar("bar");
-        Foo foo = new Foo("foo");
+        Fooo fooo = new Fooo("foo");
-        foo.setBar(bar);
+        fooo.setBar(bar);
-        entityManager.persist(foo);
+        entityManager.persist(fooo);
         flushAndClear();
 
-        foo = entityManager.find(Foo.class, foo.getId());
+        fooo = entityManager.find(Fooo.class, fooo.getId());
         bar = entityManager.find(Bar.class, bar.getId());
         entityManager.remove(bar);
         flushAndClear();
@@ -71,8 +71,8 @@ public class DeletionIntegrationTest {
         bar = entityManager.find(Bar.class, bar.getId());
         assertThat(bar, notNullValue());
 
-        foo = entityManager.find(Foo.class, foo.getId());
+        fooo = entityManager.find(Fooo.class, fooo.getId());
-        foo.setBar(null);
+        fooo.setBar(null);
         entityManager.remove(bar);
         flushAndClear();
 
@@ -83,16 +83,16 @@ public class DeletionIntegrationTest {
     @Transactional
     public final void givenEntityIsRemoved_thenRemovalIsCascaded() {
         Bar bar = new Bar("bar");
-        Foo foo = new Foo("foo");
+        Fooo fooo = new Fooo("foo");
-        foo.setBar(bar);
+        fooo.setBar(bar);
-        entityManager.persist(foo);
+        entityManager.persist(fooo);
         flushAndClear();
 
-        foo = entityManager.find(Foo.class, foo.getId());
+        fooo = entityManager.find(Fooo.class, fooo.getId());
-        entityManager.remove(foo);
+        entityManager.remove(fooo);
         flushAndClear();
 
-        assertThat(entityManager.find(Foo.class, foo.getId()), nullValue());
+        assertThat(entityManager.find(Fooo.class, fooo.getId()), nullValue());
         assertThat(entityManager.find(Bar.class, bar.getId()), nullValue());
     }
 
@@ -116,39 +116,39 @@ public class DeletionIntegrationTest {
     @Test
     @Transactional
     public final void givenEntityIsDeletedWithJpaBulkDeleteStatement_thenItIsNotInDB() {
-        Foo foo = new Foo("foo");
+        Fooo fooo = new Fooo("foo");
-        entityManager.persist(foo);
+        entityManager.persist(fooo);
         flushAndClear();
 
-        entityManager.createQuery("delete from Foo where id = :id").setParameter("id", foo.getId()).executeUpdate();
+        entityManager.createQuery("delete from Foo where id = :id").setParameter("id", fooo.getId()).executeUpdate();
 
-        assertThat(entityManager.find(Foo.class, foo.getId()), nullValue());
+        assertThat(entityManager.find(Fooo.class, fooo.getId()), nullValue());
     }
 
     @Test
     @Transactional
     public final void givenEntityIsDeletedWithNativeQuery_thenItIsNotInDB() {
-        Foo foo = new Foo("foo");
+        Fooo fooo = new Fooo("foo");
-        entityManager.persist(foo);
+        entityManager.persist(fooo);
         flushAndClear();
 
-        entityManager.createNativeQuery("delete from FOO where ID = :id").setParameter("id", foo.getId()).executeUpdate();
+        entityManager.createNativeQuery("delete from FOO where ID = :id").setParameter("id", fooo.getId()).executeUpdate();
 
-        assertThat(entityManager.find(Foo.class, foo.getId()), nullValue());
+        assertThat(entityManager.find(Fooo.class, fooo.getId()), nullValue());
     }
 
     @Test
     @Transactional
     public final void givenEntityIsSoftDeleted_thenItIsNotReturnedFromQueries() {
-        Foo foo = new Foo("foo");
+        Fooo fooo = new Fooo("foo");
-        entityManager.persist(foo);
+        entityManager.persist(fooo);
         flushAndClear();
 
-        foo = entityManager.find(Foo.class, foo.getId());
+        fooo = entityManager.find(Fooo.class, fooo.getId());
-        foo.setDeleted();
+        fooo.setDeleted();
         flushAndClear();
 
-        assertThat(entityManager.find(Foo.class, foo.getId()), nullValue());
+        assertThat(entityManager.find(Fooo.class, fooo.getId()), nullValue());
     }
 
     private void flushAndClear() {

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

@@ -55,7 +55,7 @@
         <dependency>
             <groupId>io.jsonwebtoken</groupId>
             <artifactId>jjwt-api</artifactId>
-            <version>0.12.3</version>
+            <version>${jjwt.version}</version>
         </dependency>
         <!-- persistence -->
         <dependency>
@@ -107,6 +107,18 @@
             <artifactId>jackson-core</artifactId>
             <version>${jakson-core.version}</version>
         </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-core</artifactId>
+            <version>${logback.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -115,8 +127,11 @@
         <spring-boot.version>3.1.0</spring-boot.version>
         <!-- persistence -->
         <tomcat-dbcp.version>10.1.9</tomcat-dbcp.version>
-        <jakson-databind.version>2.15.1</jakson-databind.version>
+        <jakson-databind.version>2.16.1</jakson-databind.version>
-        <jakson-core.version>2.14.2</jakson-core.version>
+        <jakson-core.version>2.16.1</jakson-core.version>
+
+        <jjwt.version>0.12.3</jjwt.version>
+        <logback.version>1.4.14</logback.version>
     </properties>
 
 </project>

persistence-modules/spring-jpa-2/src/main/java/com/baeldung/multitenant/config/MultitenantConfiguration.java

@@ -1,5 +1,6 @@
 package com.baeldung.multitenant.config;
 
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.jdbc.DataSourceBuilder;
 import org.springframework.context.annotation.Bean;
@@ -18,6 +19,9 @@ import java.util.Properties;
 @Configuration
 public class MultitenantConfiguration {
 
+    @Value("${defaultTenant}")
+    private String defaultTenant;
+
     @Bean
     @ConfigurationProperties(prefix = "tenants")
     public DataSource dataSource() {
@@ -43,7 +47,7 @@ public class MultitenantConfiguration {
         }
 
         AbstractRoutingDataSource dataSource = new MultitenantDataSource();
-        dataSource.setDefaultTargetDataSource(resolvedDataSources.get("tenant_1"));
+        dataSource.setDefaultTargetDataSource(resolvedDataSources.get(defaultTenant));
         dataSource.setTargetDataSources(resolvedDataSources);
 
         dataSource.afterPropertiesSet();

persistence-modules/spring-jpa-2/src/main/java/com/baeldung/multitenant/security/AuthenticationService.java

@@ -1,26 +1,31 @@
 package com.baeldung.multitenant.security;
 
 import io.jsonwebtoken.Jwts;
-import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.Authentication;
 
-import jakarta.servlet.http.HttpServletRequest;
+import javax.crypto.SecretKey;
-import jakarta.servlet.http.HttpServletResponse;
+import java.nio.charset.StandardCharsets;
 import java.util.Collections;
 import java.util.Date;
 
 public class AuthenticationService {
 
     private static final long EXPIRATIONTIME = 864_000_00; // 1 day in milliseconds
-    private static final String SIGNINGKEY = "SecretKey";
+    private static final String SECRETKEY = "q3t6w9zCFJNcQfTjWnq3t6w9zCFJNcQfTjWnZr4u7xADGKaPd";
+    private static final SecretKey SIGNINGKEY = Keys.hmacShaKeyFor(SECRETKEY.getBytes(StandardCharsets.UTF_8));
     private static final String PREFIX = "Bearer";
 
     public static void addToken(HttpServletResponse res, String username, String tenant) {
-        String JwtToken = Jwts.builder().setSubject(username)
+        String JwtToken = Jwts.builder()
-          .setAudience(tenant)
+          .subject(username)
-          .setExpiration(new Date(System.currentTimeMillis() + EXPIRATIONTIME))
+          .audience().add(tenant).and()
-          .signWith(SignatureAlgorithm.HS512, SIGNINGKEY)
+          .issuedAt(new Date(System.currentTimeMillis()))
+          .expiration(new Date(System.currentTimeMillis() + EXPIRATIONTIME))
+          .signWith(SIGNINGKEY)
           .compact();
         res.addHeader("Authorization", PREFIX + " " + JwtToken);
     }
@@ -29,9 +34,8 @@ public class AuthenticationService {
         String token = req.getHeader("Authorization");
         if (token != null) {
             String user = Jwts.parser()
-              .setSigningKey(SIGNINGKEY)
+              .verifyWith(SIGNINGKEY)
-              .build().parseClaimsJws(token.replace(PREFIX, ""))
+              .build().parseClaimsJws(token.replace(PREFIX, "").trim()).getPayload()
-              .getBody()
               .getSubject();
             if (user != null) {
                 return new UsernamePasswordAuthenticationToken(user, null, Collections.emptyList());
@@ -48,7 +52,7 @@ public class AuthenticationService {
         }
         String tenant = Jwts.parser()
           .setSigningKey(SIGNINGKEY)
-          .build().parseClaimsJws(token.replace(PREFIX, ""))
+          .build().parseClaimsJws(token.replace(PREFIX, "").trim())
           .getBody()
           .getAudience()
             .iterator()

persistence-modules/spring-jpa-2/src/main/java/com/baeldung/multitenant/security/SecurityConfiguration.java

@@ -4,9 +4,9 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.config.Customizer;
+import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
 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.configurers.AbstractHttpConfigurer;
 import org.springframework.security.config.annotation.web.configurers.HeadersConfigurer;
 import org.springframework.security.config.http.SessionCreationPolicy;
 import org.springframework.security.core.userdetails.User;
@@ -42,16 +42,21 @@ public class SecurityConfiguration {
         return new BCryptPasswordEncoder();
     }
 
+    @Bean
+    public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception {
+        return authenticationConfiguration.getAuthenticationManager();
+    }
+
     @Bean
     public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
-        final AuthenticationManager authenticationManager = http.getSharedObject(AuthenticationManager.class);
+        final AuthenticationManager authenticationManager = authenticationManager(http.getSharedObject(AuthenticationConfiguration.class));
         http
                 .authorizeHttpRequests(authorize ->
                         authorize.requestMatchers("/login").permitAll().anyRequest().authenticated())
                 .sessionManagement(securityContext -> securityContext.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                 .addFilterBefore(new LoginFilter("/login", authenticationManager), UsernamePasswordAuthenticationFilter.class)
                 .addFilterBefore(new AuthenticationFilter(), UsernamePasswordAuthenticationFilter.class)
-                .csrf(AbstractHttpConfigurer::disable)
+          .csrf(csrf -> csrf.disable())
                 .headers(header -> header.frameOptions(HeadersConfigurer.FrameOptionsConfig::disable))
                 .httpBasic(Customizer.withDefaults());
 

persistence-modules/spring-jpa-2/src/main/resources/application.properties

@@ -9,3 +9,7 @@ spring.datasource.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
 #spring.datasource.username=mysqluser
 #spring.datasource.password=mysqlpass
 #spring.datasource.url=jdbc:mysql://localhost:3306/myDb?createDatabaseIfNotExist=true
+
+# MultiTenantApplication
+defaultTenant=tenant_1
+spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect

pom.xml

@@ -733,7 +733,7 @@
                 <module>jackson-simple</module>
                 <module>java-blockchain</module>
                 <module>java-jdi</module>
-                <!--<module>java-panama</module>--> <!--JAVA-27339-->
+                <module>java-panama</module>
                 <module>javafx</module>
                 <module>javax-sound</module>
                 <module>javaxval-2</module>
@@ -973,7 +973,7 @@
                 <module>jackson-simple</module>
                 <module>java-blockchain</module>
                 <module>java-jdi</module>
-                <!--<module>java-panama</module>--> <!--JAVA-27339-->
+                <module>java-panama</module>
                 <module>javafx</module>
                 <module>javax-sound</module>
                 <module>javaxval-2</module>

quarkus-modules/pom.xml

@@ -19,6 +19,7 @@
         <module>quarkus-jandex</module>
         <module>quarkus-vs-springboot</module>
         <module>quarkus-funqy</module>
+        <!-- requires Java 21 <module>quarkus-virtual-threads</module> -->
     </modules>
 
 </project>

quarkus-modules/quarkus-virtual-threads/.dockerignore

@@ -0,0 +1,4 @@
+*
+!target/*-runner
+!target/*-runner.jar
+!target/lib/*

quarkus-modules/quarkus-virtual-threads/pom.xml

@@ -0,0 +1,160 @@
+<?xml version="1.0"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung.quarkus</groupId>
+    <artifactId>quarkus-virtual-threads</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>quarkus-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>${quarkus.platform.group-id}</groupId>
+                <artifactId>${quarkus.platform.artifact-id}</artifactId>
+                <version>${quarkus.platform.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <properties>
+        <compiler-plugin.version>3.11.0</compiler-plugin.version>
+        <maven.compiler.release>21</maven.compiler.release>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
+        <quarkus.platform.group-id>io.quarkus.platform</quarkus.platform.group-id>
+        <quarkus.platform.version>3.4.3</quarkus.platform.version>
+        <surefire-plugin.version>3.0.0</surefire-plugin.version>
+        <loom-unit.version>0.3.0</loom-unit.version>
+        <panache-common-deployment.version>3.6.0</panache-common-deployment.version>
+        <mockito-core.version>3.11.2</mockito-core.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-hibernate-validator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-jdbc-postgresql</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-hibernate-orm-panache</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-resteasy-reactive-jackson</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-rest-client-reactive-jackson</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-arc</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>io.rest-assured</groupId>
+            <artifactId>rest-assured</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>me.escoffier.loom</groupId>
+            <artifactId>loom-unit</artifactId>
+            <version>${loom-unit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <!-- Quarkus Test framework -->
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-junit5</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-panache-common-deployment</artifactId>
+            <version>${panache-common-deployment.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-panache-mock</artifactId>
+            <version>${panache-common-deployment.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>${quarkus.platform.group-id}</groupId>
+                <artifactId>quarkus-maven-plugin</artifactId>
+                <version>${quarkus.platform.version}</version>
+                <extensions>true</extensions>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>build</goal>
+                            <goal>generate-code</goal>
+                            <goal>generate-code-tests</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${compiler-plugin.version}</version>
+                <configuration>
+                    <compilerArgs>
+                        <arg>-parameters</arg>
+                    </compilerArgs>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${surefire-plugin.version}</version>
+                <configuration>
+                    <systemPropertyVariables>
+                        <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
+                        <maven.home>${maven.home}</maven.home>
+                    </systemPropertyVariables>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <profiles>
+        <profile>
+            <id>native</id>
+            <activation>
+                <property>
+                    <name>native</name>
+                </property>
+            </activation>
+            <properties>
+                <quarkus.package.type>native</quarkus.package.type>
+            </properties>
+        </profile>
+    </profiles>
+</project>

quarkus-modules/quarkus-virtual-threads/src/main/docker/Dockerfile.jvm

@@ -0,0 +1,97 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in JVM mode
+#
+# Before building the container image run:
+#
+# ./mvnw package
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.jvm -t quarkus/virtual-threads-jvm .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/virtual-threads-jvm
+#
+# If you want to include the debug port into your docker image
+# you will have to expose the debug port (default 5005 being the default) like this :  EXPOSE 8080 5005.
+# Additionally you will have to set -e JAVA_DEBUG=true and -e JAVA_DEBUG_PORT=*:5005
+# when running the container
+#
+# Then run the container using :
+#
+# docker run -i --rm -p 8080:8080 quarkus/virtual-threads-jvm
+#
+# This image uses the `run-java.sh` script to run the application.
+# This scripts computes the command line to execute your Java application, and
+# includes memory/GC tuning.
+# You can configure the behavior using the following environment properties:
+# - JAVA_OPTS: JVM options passed to the `java` command (example: "-verbose:class")
+# - JAVA_OPTS_APPEND: User specified Java options to be appended to generated options
+#   in JAVA_OPTS (example: "-Dsome.property=foo")
+# - JAVA_MAX_MEM_RATIO: Is used when no `-Xmx` option is given in JAVA_OPTS. This is
+#   used to calculate a default maximal heap memory based on a containers restriction.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xmx` is set to a ratio
+#   of the container available memory as set here. The default is `50` which means 50%
+#   of the available memory is used as an upper boundary. You can skip this mechanism by
+#   setting this value to `0` in which case no `-Xmx` option is added.
+# - JAVA_INITIAL_MEM_RATIO: Is used when no `-Xms` option is given in JAVA_OPTS. This
+#   is used to calculate a default initial heap memory based on the maximum heap memory.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xms` is set to a ratio
+#   of the `-Xmx` memory as set here. The default is `25` which means 25% of the `-Xmx`
+#   is used as the initial heap size. You can skip this mechanism by setting this value
+#   to `0` in which case no `-Xms` option is added (example: "25")
+# - JAVA_MAX_INITIAL_MEM: Is used when no `-Xms` option is given in JAVA_OPTS.
+#   This is used to calculate the maximum value of the initial heap memory. If used in
+#   a container without any memory constraints for the container then this option has
+#   no effect. If there is a memory constraint then `-Xms` is limited to the value set
+#   here. The default is 4096MB which means the calculated value of `-Xms` never will
+#   be greater than 4096MB. The value of this variable is expressed in MB (example: "4096")
+# - JAVA_DIAGNOSTICS: Set this to get some diagnostics information to standard output
+#   when things are happening. This option, if set to true, will set
+#  `-XX:+UnlockDiagnosticVMOptions`. Disabled by default (example: "true").
+# - JAVA_DEBUG: If set remote debugging will be switched on. Disabled by default (example:
+#    true").
+# - JAVA_DEBUG_PORT: Port used for remote debugging. Defaults to 5005 (example: "8787").
+# - CONTAINER_CORE_LIMIT: A calculated core limit as described in
+#   https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt. (example: "2")
+# - CONTAINER_MAX_MEMORY: Memory limit given to the container (example: "1024").
+# - GC_MIN_HEAP_FREE_RATIO: Minimum percentage of heap free after GC to avoid expansion.
+#   (example: "20")
+# - GC_MAX_HEAP_FREE_RATIO: Maximum percentage of heap free after GC to avoid shrinking.
+#   (example: "40")
+# - GC_TIME_RATIO: Specifies the ratio of the time spent outside the garbage collection.
+#   (example: "4")
+# - GC_ADAPTIVE_SIZE_POLICY_WEIGHT: The weighting given to the current GC time versus
+#   previous GC times. (example: "90")
+# - GC_METASPACE_SIZE: The initial metaspace size. (example: "20")
+# - GC_MAX_METASPACE_SIZE: The maximum metaspace size. (example: "100")
+# - GC_CONTAINER_OPTIONS: Specify Java GC to use. The value of this variable should
+#   contain the necessary JRE command-line options to specify the required GC, which
+#   will override the default of `-XX:+UseParallelGC` (example: -XX:+UseG1GC).
+# - HTTPS_PROXY: The location of the https proxy. (example: "myuser@127.0.0.1:8080")
+# - HTTP_PROXY: The location of the http proxy. (example: "myuser@127.0.0.1:8080")
+# - NO_PROXY: A comma separated lists of hosts, IP addresses or domains that can be
+#   accessed directly. (example: "foo.example.com,bar.example.com")
+#
+###
+FROM registry.access.redhat.com/ubi8/openjdk-21:1.18
+
+ENV LANGUAGE='en_US:en'
+
+
+# We make four distinct layers so if there are application changes the library layers can be re-used
+COPY --chown=185 target/quarkus-app/lib/ /deployments/lib/
+COPY --chown=185 target/quarkus-app/*.jar /deployments/
+COPY --chown=185 target/quarkus-app/app/ /deployments/app/
+COPY --chown=185 target/quarkus-app/quarkus/ /deployments/quarkus/
+
+EXPOSE 8080
+USER 185
+ENV JAVA_OPTS_APPEND="-Dquarkus.http.host=0.0.0.0 -Djava.util.logging.manager=org.jboss.logmanager.LogManager"
+ENV JAVA_APP_JAR="/deployments/quarkus-run.jar"
+
+ENTRYPOINT [ "/opt/jboss/container/java/run/run-java.sh" ]
+

quarkus-modules/quarkus-virtual-threads/src/main/docker/Dockerfile.legacy-jar

@@ -0,0 +1,93 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in JVM mode
+#
+# Before building the container image run:
+#
+# ./mvnw package -Dquarkus.package.type=legacy-jar
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.legacy-jar -t quarkus/virtual-threads-legacy-jar .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/virtual-threads-legacy-jar
+#
+# If you want to include the debug port into your docker image
+# you will have to expose the debug port (default 5005 being the default) like this :  EXPOSE 8080 5005.
+# Additionally you will have to set -e JAVA_DEBUG=true and -e JAVA_DEBUG_PORT=*:5005
+# when running the container
+#
+# Then run the container using :
+#
+# docker run -i --rm -p 8080:8080 quarkus/virtual-threads-legacy-jar
+#
+# This image uses the `run-java.sh` script to run the application.
+# This scripts computes the command line to execute your Java application, and
+# includes memory/GC tuning.
+# You can configure the behavior using the following environment properties:
+# - JAVA_OPTS: JVM options passed to the `java` command (example: "-verbose:class")
+# - JAVA_OPTS_APPEND: User specified Java options to be appended to generated options
+#   in JAVA_OPTS (example: "-Dsome.property=foo")
+# - JAVA_MAX_MEM_RATIO: Is used when no `-Xmx` option is given in JAVA_OPTS. This is
+#   used to calculate a default maximal heap memory based on a containers restriction.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xmx` is set to a ratio
+#   of the container available memory as set here. The default is `50` which means 50%
+#   of the available memory is used as an upper boundary. You can skip this mechanism by
+#   setting this value to `0` in which case no `-Xmx` option is added.
+# - JAVA_INITIAL_MEM_RATIO: Is used when no `-Xms` option is given in JAVA_OPTS. This
+#   is used to calculate a default initial heap memory based on the maximum heap memory.
+#   If used in a container without any memory constraints for the container then this
+#   option has no effect. If there is a memory constraint then `-Xms` is set to a ratio
+#   of the `-Xmx` memory as set here. The default is `25` which means 25% of the `-Xmx`
+#   is used as the initial heap size. You can skip this mechanism by setting this value
+#   to `0` in which case no `-Xms` option is added (example: "25")
+# - JAVA_MAX_INITIAL_MEM: Is used when no `-Xms` option is given in JAVA_OPTS.
+#   This is used to calculate the maximum value of the initial heap memory. If used in
+#   a container without any memory constraints for the container then this option has
+#   no effect. If there is a memory constraint then `-Xms` is limited to the value set
+#   here. The default is 4096MB which means the calculated value of `-Xms` never will
+#   be greater than 4096MB. The value of this variable is expressed in MB (example: "4096")
+# - JAVA_DIAGNOSTICS: Set this to get some diagnostics information to standard output
+#   when things are happening. This option, if set to true, will set
+#  `-XX:+UnlockDiagnosticVMOptions`. Disabled by default (example: "true").
+# - JAVA_DEBUG: If set remote debugging will be switched on. Disabled by default (example:
+#    true").
+# - JAVA_DEBUG_PORT: Port used for remote debugging. Defaults to 5005 (example: "8787").
+# - CONTAINER_CORE_LIMIT: A calculated core limit as described in
+#   https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt. (example: "2")
+# - CONTAINER_MAX_MEMORY: Memory limit given to the container (example: "1024").
+# - GC_MIN_HEAP_FREE_RATIO: Minimum percentage of heap free after GC to avoid expansion.
+#   (example: "20")
+# - GC_MAX_HEAP_FREE_RATIO: Maximum percentage of heap free after GC to avoid shrinking.
+#   (example: "40")
+# - GC_TIME_RATIO: Specifies the ratio of the time spent outside the garbage collection.
+#   (example: "4")
+# - GC_ADAPTIVE_SIZE_POLICY_WEIGHT: The weighting given to the current GC time versus
+#   previous GC times. (example: "90")
+# - GC_METASPACE_SIZE: The initial metaspace size. (example: "20")
+# - GC_MAX_METASPACE_SIZE: The maximum metaspace size. (example: "100")
+# - GC_CONTAINER_OPTIONS: Specify Java GC to use. The value of this variable should
+#   contain the necessary JRE command-line options to specify the required GC, which
+#   will override the default of `-XX:+UseParallelGC` (example: -XX:+UseG1GC).
+# - HTTPS_PROXY: The location of the https proxy. (example: "myuser@127.0.0.1:8080")
+# - HTTP_PROXY: The location of the http proxy. (example: "myuser@127.0.0.1:8080")
+# - NO_PROXY: A comma separated lists of hosts, IP addresses or domains that can be
+#   accessed directly. (example: "foo.example.com,bar.example.com")
+#
+###
+FROM registry.access.redhat.com/ubi8/openjdk-21:1.18
+
+ENV LANGUAGE='en_US:en'
+
+
+COPY target/lib/* /deployments/lib/
+COPY target/*-runner.jar /deployments/quarkus-run.jar
+
+EXPOSE 8080
+USER 185
+ENV JAVA_OPTS_APPEND="-Dquarkus.http.host=0.0.0.0 -Djava.util.logging.manager=org.jboss.logmanager.LogManager"
+ENV JAVA_APP_JAR="/deployments/quarkus-run.jar"
+
+ENTRYPOINT [ "/opt/jboss/container/java/run/run-java.sh" ]

quarkus-modules/quarkus-virtual-threads/src/main/docker/Dockerfile.native

@@ -0,0 +1,27 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in native (no JVM) mode.
+#
+# Before building the container image run:
+#
+# ./mvnw package -Dnative
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.native -t quarkus/virtual-threads .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/virtual-threads
+#
+###
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.9
+WORKDIR /work/
+RUN chown 1001 /work \
+    && chmod "g+rwX" /work \
+    && chown 1001:root /work
+COPY --chown=1001:root target/*-runner /work/application
+
+EXPOSE 8080
+USER 1001
+
+ENTRYPOINT ["./application", "-Dquarkus.http.host=0.0.0.0"]

quarkus-modules/quarkus-virtual-threads/src/main/docker/Dockerfile.native-micro

@@ -0,0 +1,30 @@
+####
+# This Dockerfile is used in order to build a container that runs the Quarkus application in native (no JVM) mode.
+# It uses a micro base image, tuned for Quarkus native executables.
+# It reduces the size of the resulting container image.
+# Check https://quarkus.io/guides/quarkus-runtime-base-image for further information about this image.
+#
+# Before building the container image run:
+#
+# ./mvnw package -Dnative
+#
+# Then, build the image with:
+#
+# docker build -f src/main/docker/Dockerfile.native-micro -t quarkus/virtual-threads .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 quarkus/virtual-threads
+#
+###
+FROM quay.io/quarkus/quarkus-micro-image:2.0
+WORKDIR /work/
+RUN chown 1001 /work \
+    && chmod "g+rwX" /work \
+    && chown 1001:root /work
+COPY --chown=1001:root target/*-runner /work/application
+
+EXPOSE 8080
+USER 1001
+
+ENTRYPOINT ["./application", "-Dquarkus.http.host=0.0.0.0"]

quarkus-modules/quarkus-virtual-threads/src/main/java/com/baeldung/quarkus/GreetingResource.java

@@ -0,0 +1,16 @@
+package com.baeldung.quarkus;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+
+@Path("/hello")
+public class GreetingResource {
+
+    @GET
+    @Produces(MediaType.TEXT_PLAIN)
+    public String hello() {
+        return "Hello from RESTEasy Reactive";
+    }
+}

quarkus-modules/quarkus-virtual-threads/src/main/java/com/baeldung/quarkus/rest/RemoteService.java

@@ -0,0 +1,14 @@
+package com.baeldung.quarkus.rest;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
+
+@RegisterRestClient(configKey = "remote-service")
+public interface RemoteService {
+    @GET
+    @Path("/greetings")
+    default String greetings(){
+        return "Mocked Greeting";
+    };
+}

quarkus-modules/quarkus-virtual-threads/src/main/java/com/baeldung/quarkus/rest/VirtualThreadApp.java

@@ -0,0 +1,16 @@
+package com.baeldung.quarkus.rest;
+
+import io.smallrye.common.annotation.RunOnVirtualThread;
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import org.eclipse.microprofile.rest.client.inject.RestClient;
+
+@Path("/greetings")
+public class VirtualThreadApp {
+    @RestClient RemoteService service;
+    @GET @RunOnVirtualThread
+    public String process() {
+        var response = service.greetings();
+        return response.toUpperCase();
+    }
+}

quarkus-modules/quarkus-virtual-threads/src/main/resources/application.properties

@@ -0,0 +1 @@
+remote-service/mp-rest/url=http://localhost:8080

quarkus-modules/quarkus-virtual-threads/src/test/java/com/baeldung/quarkus/GreetingResource.java

@@ -0,0 +1,16 @@
+package com.baeldung.quarkus;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.MediaType;
+
+@Path("/hello")
+public class GreetingResource {
+
+    @GET
+    @Produces(MediaType.TEXT_PLAIN)
+    public String hello() {
+        return "Hello from RESTEasy Reactive";
+    }
+}

quarkus-modules/quarkus-virtual-threads/src/test/java/com/baeldung/quarkus/rest/RemoteService.java

@@ -0,0 +1,14 @@
+package com.baeldung.quarkus.rest;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
+
+@RegisterRestClient(configKey = "remote-service")
+public interface RemoteService {
+    @GET
+    @Path("/greetings")
+    default String greetings(){
+        return "Mocked Greeting";
+    };
+}

quarkus-modules/quarkus-virtual-threads/src/test/java/com/baeldung/quarkus/rest/VirtualThreadApp.java

@@ -0,0 +1,16 @@
+package com.baeldung.quarkus.rest;
+
+import io.smallrye.common.annotation.RunOnVirtualThread;
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import org.eclipse.microprofile.rest.client.inject.RestClient;
+
+@Path("/greetings")
+public class VirtualThreadApp {
+    @RestClient RemoteService service;
+    @GET @RunOnVirtualThread
+    public String process() {
+        var response = service.greetings();
+        return response.toUpperCase();
+    }
+}

spring-batch-2/README.md

@@ -2,4 +2,5 @@
 
 - [Spring Boot With Spring Batch](https://www.baeldung.com/spring-boot-spring-batch)
 - [How to Trigger and Stop a Scheduled Spring Batch Job](https://www.baeldung.com/spring-batch-start-stop-job)
+- [Access Job Parameters From ItemReader in Spring Batch](https://www.baeldung.com/spring-batch-itemreader-access-job-parameters)
 - More articles [[<-- prev]](/spring-batch)

spring-boot-modules/spring-boot-basic-customization-2/README.md

@@ -11,3 +11,4 @@ This module contains articles about Spring Boot customization 2
  - [Guide to Spring Type Conversions](https://www.baeldung.com/spring-type-conversions)
  - [Container Configuration in Spring Boot 2](https://www.baeldung.com/embeddedservletcontainercustomizer-configurableembeddedservletcontainer-spring-boot)
  - [Speed up Spring Boot Startup Time](https://www.baeldung.com/spring-boot-startup-speed)
+ - More articles: [[<-- prev]](/spring-boot-modules/spring-boot-basic-customization)

spring-boot-modules/spring-boot-basic-customization-2/pom.xml

@@ -9,9 +9,10 @@
     <description>Module For Spring Boot Basic Customization 2</description>
 
     <parent>
-        <groupId>com.baeldung.spring-boot-modules</groupId>
+        <groupId>com.baeldung</groupId>
-        <artifactId>spring-boot-modules</artifactId>
+        <artifactId>parent-boot-3</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-3</relativePath>
     </parent>
 
     <dependencies>

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/dispatchservlet/conf/WebConf.java

@@ -7,7 +7,7 @@ import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
-import javax.servlet.ServletContextListener;
+import jakarta.servlet.ServletContextListener;
 
 @Configuration
 public class WebConf {

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/dispatchservlet/filter/CustomFilter.java

@@ -4,7 +4,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
 
-import javax.servlet.*;
+import jakarta.servlet.*;
 import java.io.IOException;
 
 @Component

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/dispatchservlet/listener/CustomListener.java

@@ -3,8 +3,8 @@ package com.baeldung.dispatchservlet.listener;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.servlet.ServletContextEvent;
+import jakarta.servlet.ServletContextEvent;
-import javax.servlet.ServletContextListener;
+import jakarta.servlet.ServletContextListener;
 
 public class CustomListener implements ServletContextListener {
 

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/dispatchservlet/servlet/CustomServlet.java

@@ -4,11 +4,11 @@ import com.baeldung.dispatchservlet.filter.CustomFilter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.servlet.ServletException;
+import jakarta.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
+import jakarta.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 public class CustomServlet extends HttpServlet {

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/onceperrequestfilter/AuthenticationFilter.java

@@ -3,10 +3,10 @@ package com.baeldung.onceperrequestfilter;
 import org.springframework.stereotype.Component;
 import org.springframework.web.filter.OncePerRequestFilter;
 
-import javax.servlet.FilterChain;
+import jakarta.servlet.FilterChain;
-import javax.servlet.ServletException;
+import jakarta.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 @Component

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/onceperrequestfilter/HelloController.java

@@ -6,7 +6,7 @@ import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.context.request.async.DeferredResult;
 
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpServletResponse;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/onceperrequestfilter/MyOncePerRequestFilter.java

@@ -5,10 +5,10 @@ import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
 import org.springframework.web.filter.OncePerRequestFilter;
 
-import javax.servlet.FilterChain;
+import jakarta.servlet.FilterChain;
-import javax.servlet.ServletException;
+import jakarta.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 @Component

spring-boot-modules/spring-boot-basic-customization-2/src/main/java/com/baeldung/typeconversion/entity/Employee.java

@@ -1,7 +1,7 @@
 package com.baeldung.typeconversion.entity;
 
-import javax.persistence.Entity;
+import jakarta.persistence.Entity;
-import javax.persistence.Id;
+import jakarta.persistence.Id;
 
 @Entity
 public class Employee {

spring-boot-modules/spring-boot-basic-customization/README.md

@@ -11,3 +11,4 @@ This module contains articles about Spring Boot customization
  - [Spring Boot: Configuring a Main Class](https://www.baeldung.com/spring-boot-main-class)
  - [How to Define a Spring Boot Filter?](https://www.baeldung.com/spring-boot-add-filter)
  - [Guide to the Favicon in Spring Boot](https://www.baeldung.com/spring-boot-favicon)
+ - More articles: [[next -->]](/spring-boot-modules/spring-boot-basic-customization-2)

spring-boot-modules/spring-boot-basic-customization/pom.xml

@@ -9,9 +9,10 @@
     <description>Module For Spring Boot Basic Customization</description>
 
     <parent>
-        <groupId>com.baeldung.spring-boot-modules</groupId>
+        <groupId>com.baeldung</groupId>
-        <artifactId>spring-boot-modules</artifactId>
+        <artifactId>parent-boot-3</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-3</relativePath>
     </parent>
 
     <dependencies>
@@ -81,7 +82,7 @@
     </build>
 
     <properties>
-        <spring-boot-maven-plugin.version>1.5.2.RELEASE</spring-boot-maven-plugin.version>
+        <spring-boot-maven-plugin.version>3.1.5</spring-boot-maven-plugin.version>
         <!-- The main class to start by executing "java -jar" -->
         <start-class>com.baeldung.changeport.CustomApplication</start-class>
     </properties>

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/filters/RequestResponseLoggingFilter.java

@@ -5,9 +5,14 @@ import org.slf4j.LoggerFactory;
 import org.springframework.core.annotation.Order;
 import org.springframework.stereotype.Component;
 
-import javax.servlet.*;
+import jakarta.servlet.Filter;
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.FilterChain;
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.FilterConfig;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 /**
@@ -23,7 +28,7 @@ public class RequestResponseLoggingFilter implements Filter {
 	private final static Logger LOG = LoggerFactory.getLogger(RequestResponseLoggingFilter.class);
 
 	@Override
-	public void init(final FilterConfig filterConfig) throws ServletException {
+	public void init(final FilterConfig filterConfig) {
 		LOG.info("Initializing filter :{}", this);
 	}
 

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/filters/TransactionFilter.java

@@ -5,8 +5,13 @@ import org.slf4j.LoggerFactory;
 import org.springframework.core.annotation.Order;
 import org.springframework.stereotype.Component;
 
-import javax.servlet.*;
+import jakarta.servlet.Filter;
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.FilterConfig;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.http.HttpServletRequest;
 import java.io.IOException;
 
 /**

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/errorhandling/controllers/MyErrorController.java

@@ -5,8 +5,8 @@ import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 
-import javax.servlet.RequestDispatcher;
+import jakarta.servlet.RequestDispatcher;
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequest;
 
 @Controller
 public class MyErrorController implements ErrorController {

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/FailureAnalyzerApplication.java

@@ -4,7 +4,7 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Profile;
 
-import javax.annotation.security.RolesAllowed;
+import jakarta.annotation.security.RolesAllowed;
 
 @Profile("failureanalyzer")
 @SpringBootApplication(scanBasePackages = "com.baeldung.failureanalyzer")

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/MyService.java

@@ -2,7 +2,7 @@ package com.baeldung.failureanalyzer;
 
 import org.springframework.stereotype.Service;
 
-import javax.annotation.Resource;
+import jakarta.annotation.Resource;
 
 @Service
 public class MyService {

spring-boot-modules/spring-boot-basic-customization/src/main/resources/META-INF/spring.factories

@@ -1,2 +1 @@
 org.springframework.boot.diagnostics.FailureAnalyzer=com.baeldung.failureanalyzer.MyBeanNotOfRequiredTypeFailureAnalyzer
-

spring-boot-modules/spring-boot-environment/pom.xml

@@ -158,7 +158,7 @@
     <properties>
         <subethasmtp.version>3.1.7</subethasmtp.version>
         <httpclient.version>4.5.8</httpclient.version>
-        <spring.cloud-version>2021.0.0</spring.cloud-version>
+        <spring.cloud-version>2023.0.0</spring.cloud-version>
     </properties>
 
 </project>

spring-reactive-modules/spring-reactive-3/README.md

@@ -8,4 +8,5 @@ This module contains articles about reactive Spring Boot.
 - [Spring Boot Actuator](https://www.baeldung.com/spring-boot-actuators)
 - [Reactive WebSockets with Spring 5](https://www.baeldung.com/spring-5-reactive-websockets)
 - [A Guide to Spring Session Reactive Support: WebSession](https://www.baeldung.com/spring-session-reactive)
+- [Custom JSON Deserialization Using Spring WebClient](https://www.baeldung.com/spring-webclient-json-custom-deserialization)
 - More articles: [[<-- prev]](../spring-reactive-2)