Merge branch 'master' into BAEL-7278

algorithms-modules/algorithms-miscellaneous-7/README.md

@@ -4,4 +4,5 @@
 - [Find the N Most Frequent Elements in a Java Array](https://www.baeldung.com/java-n-most-frequent-elements-array)
 - [Getting Pixel Array From Image in Java](https://www.baeldung.com/java-getting-pixel-array-from-image)
 - [Calculate Distance Between Two Coordinates in Java](https://www.baeldung.com/java-find-distance-between-points)
+- [Rotate Arrays in Java](https://www.baeldung.com/java-rotate-arrays)
 - More articles: [[<-- prev]](/algorithms-miscellaneous-6)

algorithms-modules/algorithms-miscellaneous-7/src/main/java/com/baeldung/algorithms/rotatearray/RotateArray.java

@@ -0,0 +1,102 @@
+package com.baeldung.algorithms.rotatearray;
+
+/**
+ *  To speed up the rotation, we narrow k rotations to the remainder of k divided by the array length, or k module the array length.
+ *  Therefore, a large rotation number will be translated into the relative smallest rotation.
+ *  All solutions replace the original array, although they might use an extra array to compute the rotation.
+ */
+public class RotateArray {
+
+    private RotateArray() {
+        throw new IllegalStateException("Rotate array algorithm utility methods class");
+    }
+
+    /**
+     *
+     * @param arr array to apply rotation to
+     * @param k number of rotations
+     */
+    public static void bruteForce(int[] arr, int k) {
+        checkInvalidInput(arr, k);
+
+        k %= arr.length;
+        int temp;
+        int previous;
+        for (int i = 0; i < k; i++) {
+            previous = arr[arr.length - 1];
+            for (int j = 0; j < arr.length; j++) {
+                temp = arr[j];
+                arr[j] = previous;
+                previous = temp;
+            }
+        }
+    }
+
+    /**
+     *
+     * @param arr array to apply rotation to
+     * @param k number of rotations
+     */
+    public static void withExtraArray(int[] arr, int k) {
+        checkInvalidInput(arr, k);
+
+        int[] extraArray = new int[arr.length];
+        for (int i = 0; i < arr.length; i++) {
+            extraArray[(i + k) % arr.length] = arr[i];
+        }
+        System.arraycopy(extraArray, 0, arr, 0, arr.length);
+    }
+
+    /**
+     *
+     * @param arr array to apply rotation to
+     * @param k number of rotations
+     */
+    public static void cyclicReplacement(int[] arr, int k) {
+        checkInvalidInput(arr, k);
+
+        k = k % arr.length;
+        int count = 0;
+        for (int start = 0; count < arr.length; start++) {
+            int current = start;
+            int prev = arr[start];
+            do {
+                int next = (current + k) % arr.length;
+                int temp = arr[next];
+                arr[next] = prev;
+                prev = temp;
+                current = next;
+                count++;
+            } while (start != current);
+        }
+    }
+
+    /**
+     *
+     * @param arr array to apply rotation to
+     * @param k number of rotations
+     */
+    public static void reverse(int[] arr, int k) {
+        checkInvalidInput(arr, k);
+
+        k %= arr.length;
+        reverse(arr, 0, arr.length - 1);
+        reverse(arr, 0, k - 1);
+        reverse(arr, k, arr.length - 1);
+    }
+
+    private static void reverse(int[] nums, int start, int end) {
+        while (start < end) {
+            int temp = nums[start];
+            nums[start] = nums[end];
+            nums[end] = temp;
+            start++;
+            end--;
+        }
+    }
+
+    private static void checkInvalidInput(int[] arr, int rotation) {
+        if (rotation < 1 || arr == null)
+            throw new IllegalArgumentException("Rotation must be greater than zero or array must be not null");
+    }
+}

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/connect4/GameBoard.java

@@ -0,0 +1,129 @@
+package com.baeldung.algorithms.connect4;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class GameBoard {
+    private final List<List<Piece>> columns;
+
+    private final int rows;
+
+    public GameBoard(int columns, int rows) {
+        this.rows = rows;
+        this.columns = new ArrayList<>();
+
+        for (int i = 0; i < columns; ++i) {
+            this.columns.add(new ArrayList<>());
+        }
+    }
+
+    public int getRows() {
+        return rows;
+    }
+
+    public int getColumns() {
+        return columns.size();
+    }
+
+    public Piece getCell(int x, int y) {
+        assert(x >= 0 && x < getColumns());
+        assert(y >= 0 && y < getRows());
+
+        List<Piece> column = columns.get(x);
+
+        if (column.size() > y) {
+            return column.get(y);
+        } else {
+            return null;
+        }
+    }
+
+    public boolean move(int x, Piece player) {
+        assert(x >= 0 && x < getColumns());
+
+        List<Piece> column = columns.get(x);
+
+        if (column.size() >= this.rows) {
+            throw new IllegalArgumentException("That column is full");
+        }
+
+        column.add(player);
+
+        return checkWin(x, column.size() - 1, player);
+    }
+
+    private boolean checkWin(int x, int y, Piece player) {
+        // Vertical line
+        if (checkLine(x, y, 0, -1, player)) {
+            return true;
+        }
+
+        for (int offset = 0; offset < 4; ++offset) {
+            // Horizontal line
+            if (checkLine(x - 3 + offset, y, 1, 0, player)) {
+                return true;
+            }
+
+            // Leading diagonal
+            if (checkLine(x - 3 + offset, y + 3 - offset, 1, -1, player)) {
+                return true;
+            }
+
+            // Trailing diagonal
+            if (checkLine(x - 3 + offset, y - 3 + offset, 1, 1, player)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private boolean checkLine(int x1, int y1, int xDiff, int yDiff, Piece player) {
+        for (int i = 0; i < 4; ++i) {
+            int x = x1 + (xDiff * i);
+            int y = y1 + (yDiff * i);
+
+            if (x < 0 || x > columns.size() - 1) {
+                return false;
+            }
+
+            if (y < 0 || y > rows - 1) {
+                return false;
+            }
+
+            if (player != getCell(x, y)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder result = new StringBuilder();
+
+        for (int y = getRows() - 1; y >= 0; --y) {
+            for (int x = 0; x < getColumns(); ++x) {
+                Piece piece = getCell(x, y);
+
+                result.append("|");
+                if (piece == null) {
+                    result.append(" ");
+                } else if (piece == Piece.PLAYER_1) {
+                    result.append("X");
+                } else if (piece == Piece.PLAYER_2) {
+                    result.append("O");
+                }
+            }
+
+            result.append("|\n");
+            for (int i = 0; i < getColumns(); ++i) {
+                result.append("+-");
+            }
+            result.append("+\n");
+        }
+
+        return result.toString();
+    }
+}

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/connect4/GameUnitTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.algorithms.connect4;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class GameUnitTest {
+    @Test
+    public void blankGame() {
+        GameBoard gameBoard = new GameBoard(8, 6);
+
+        System.out.println(gameBoard);
+    }
+
+    @Test
+    public void playedGame() {
+        GameBoard gameBoard = new GameBoard(8, 6);
+
+        assertFalse(gameBoard.move(3, Piece.PLAYER_1));
+        assertFalse(gameBoard.move(2, Piece.PLAYER_2));
+
+        assertFalse(gameBoard.move(4, Piece.PLAYER_1));
+        assertFalse(gameBoard.move(3, Piece.PLAYER_2));
+
+        assertFalse(gameBoard.move(5, Piece.PLAYER_1));
+        assertFalse(gameBoard.move(6, Piece.PLAYER_2));
+
+        assertFalse(gameBoard.move(5, Piece.PLAYER_1));
+        assertFalse(gameBoard.move(4, Piece.PLAYER_2));
+
+        assertFalse(gameBoard.move(5, Piece.PLAYER_1));
+        assertFalse(gameBoard.move(5, Piece.PLAYER_2));
+
+        assertFalse(gameBoard.move(6, Piece.PLAYER_1));
+        assertTrue(gameBoard.move(4, Piece.PLAYER_2));
+
+        System.out.println(gameBoard);
+    }
+}

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/connect4/Piece.java

@@ -0,0 +1,6 @@
+package com.baeldung.algorithms.connect4;
+
+public enum Piece {
+    PLAYER_1,
+    PLAYER_2
+}

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/connect4/README.md

@@ -0,0 +1,2 @@
+## Relevant Articles
+- [Implement Connect 4 Game with Java](https://www.baeldung.com/java-connect-4-game)

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/rotatearray/RotateArrayUnitTest.java

@@ -0,0 +1,124 @@
+package com.baeldung.algorithms.rotatearray;
+
+import static com.baeldung.algorithms.rotatearray.RotateArray.bruteForce;
+import static com.baeldung.algorithms.rotatearray.RotateArray.cyclicReplacement;
+import static com.baeldung.algorithms.rotatearray.RotateArray.reverse;
+import static com.baeldung.algorithms.rotatearray.RotateArray.withExtraArray;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+class RotateArrayUnitTest {
+
+    private final int[] arr = { 1, 2, 3, 4, 5, 6 };
+    private final int rotationLtArrayLength = 1;
+    private final int rotationGtArrayLength = arr.length + 2;
+    private final int[] ltArrayLengthRotation = { 6, 1, 2, 3, 4, 5 };
+    private final int[] gtArrayLengthRotation = { 5, 6, 1, 2, 3, 4 };
+
+    @Test
+    void givenInputArray_whenNoRotationOrEmptyArray_thenThrowIllegalArgumentException() {
+        final int noRotation = 0;
+        final int someRotation = arr.length - 1;
+
+        assertThrows(IllegalArgumentException.class, () -> bruteForce(arr, noRotation));
+        assertThrows(IllegalArgumentException.class, () -> withExtraArray(arr, noRotation));
+        assertThrows(IllegalArgumentException.class, () -> cyclicReplacement(arr, noRotation));
+        assertThrows(IllegalArgumentException.class, () -> reverse(arr, noRotation));
+
+        assertThrows(IllegalArgumentException.class, () -> bruteForce(null, someRotation));
+        assertThrows(IllegalArgumentException.class, () -> withExtraArray(null, someRotation));
+        assertThrows(IllegalArgumentException.class, () -> cyclicReplacement(null, someRotation));
+        assertThrows(IllegalArgumentException.class, () -> reverse(null, someRotation));
+    }
+
+    @Test
+    void givenInputArray_whenUseBruteForceRotationLtArrayLength_thenRotateArrayOk() {
+
+        bruteForce(arr, rotationLtArrayLength);
+        assertArrayEquals(ltArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseBruteForceRotationGtArrayLength_thenRotateArrayOk() {
+
+        bruteForce(arr, rotationGtArrayLength);
+        assertArrayEquals(gtArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseBruteForceRotationEqArrayLength_thenDoNothing() {
+        int[] expected = arr.clone();
+
+        bruteForce(arr, arr.length);
+        assertArrayEquals(expected, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseExtraArrayRotationLtArrayLength_thenRotateArrayOk() {
+
+        withExtraArray(arr, rotationLtArrayLength);
+        assertArrayEquals(ltArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseExtraArrayRotationGtArrayLength_thenRotateArrayOk() {
+
+        withExtraArray(arr, rotationGtArrayLength);
+        assertArrayEquals(gtArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseExtraArrayWithRotationEqArrayLength_thenDoNothing() {
+        int[] clone = arr.clone();
+
+        withExtraArray(arr, arr.length);
+        assertArrayEquals(clone, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseCyclicReplacementRotationLtArrayLength_thenRotateArrayOk() {
+
+        cyclicReplacement(arr, rotationLtArrayLength);
+        assertArrayEquals(ltArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseCyclicReplacementRotationGtArrayLength_thenRotateArrayOk() {
+
+        cyclicReplacement(arr, rotationGtArrayLength);
+        assertArrayEquals(gtArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseCyclicReplacementRotationEqArrayLength_thenDoNothing() {
+        int[] clone = arr.clone();
+
+        cyclicReplacement(arr, arr.length);
+        assertArrayEquals(clone, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseReverseRotationLtArrayLength_thenRotateArrayOk() {
+
+        reverse(arr, rotationLtArrayLength);
+        assertArrayEquals(ltArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseReverseRotationGtArrayLength_thenRotateArrayOk() {
+
+        reverse(arr, rotationGtArrayLength);
+        assertArrayEquals(gtArrayLengthRotation, arr);
+    }
+
+    @Test
+    void givenInputArray_whenUseReverseRotationEqArrayLength_thenDoNothing() {
+
+        int[] clone = arr.clone();
+
+        reverse(arr, arr.length);
+        assertArrayEquals(clone, arr);
+    }
+}

algorithms-modules/pom.xml

@@ -28,7 +28,7 @@
     </modules>
 
     <properties>
-        <commons-codec.version>1.11</commons-codec.version>
+        <commons-codec.version>1.16.0</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <cobertura.plugin.version>2.7</cobertura.plugin.version>
         <tradukisto.version>1.0.1</tradukisto.version>

apache-httpclient/pom.xml

@@ -58,7 +58,7 @@
         </dependency>
 
         <dependency>
-            <groupId>com.github.tomakehurst</groupId>
+            <groupId>org.wiremock</groupId>
             <artifactId>wiremock</artifactId>
             <version>${wiremock.version}</version>
             <scope>test</scope>
@@ -77,11 +77,11 @@
 
     <properties>
         <mockserver.version>5.6.1</mockserver.version>
-        <wiremock.version>2.5.1</wiremock.version>
+        <wiremock.version>3.3.1</wiremock.version>
         <!-- http client & core 5 -->
-        <httpcore5.version>5.2</httpcore5.version>
+        <httpcore5.version>5.2.2</httpcore5.version>
-        <httpclient5.version>5.2</httpclient5.version>
+        <httpclient5.version>5.2.2</httpclient5.version>
-        <httpclient5-fluent.version>5.2</httpclient5-fluent.version>
+        <httpclient5-fluent.version>5.2.2</httpclient5-fluent.version>
     </properties>
 
 </project>

apache-httpclient/src/test/java/com/baeldung/httpclient/GetRequestMockServer.java

@@ -8,7 +8,7 @@ import static org.mockserver.model.HttpResponse.response;
 import java.io.IOException;
 import java.net.ServerSocket;
 
-import org.apache.http.HttpStatus;
+import org.apache.hc.core5.http.HttpStatus;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.mockserver.client.MockServerClient;

apache-httpclient/src/test/java/com/baeldung/httpclient/HttpAsyncClientLiveTest.java

@@ -25,6 +25,7 @@ import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBu
 import org.apache.hc.client5.http.impl.routing.DefaultProxyRoutePlanner;
 import org.apache.hc.client5.http.protocol.HttpClientContext;
 import org.apache.hc.client5.http.ssl.ClientTlsStrategyBuilder;
+import org.apache.hc.client5.http.ssl.NoopHostnameVerifier;
 import org.apache.hc.core5.http.HttpHost;
 import org.apache.hc.core5.http.HttpResponse;
 import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
@@ -33,13 +34,10 @@ import org.apache.hc.core5.http.protocol.HttpContext;
 import org.apache.hc.core5.reactor.IOReactorConfig;
 import org.apache.hc.core5.ssl.SSLContexts;
 import org.apache.hc.core5.ssl.TrustStrategy;
-import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
 import org.junit.jupiter.api.Test;
 
 
 class HttpAsyncClientLiveTest extends GetRequestMockServer {
-
-    private static final String HOST = "http://www.google.com";
     private static final String HOST_WITH_SSL = "https://mms.nw.ru/";
     private static final String HOST_WITH_PROXY = "http://httpbin.org/";
     private static final String URL_SECURED_BY_BASIC_AUTHENTICATION = "http://browserspy.dk/password-ok.php";// "http://localhost:8080/spring-security-rest-basic-auth/api/foos/1";
@@ -122,7 +120,7 @@ class HttpAsyncClientLiveTest extends GetRequestMockServer {
             .build();
 
         final TlsStrategy tlsStrategy = ClientTlsStrategyBuilder.create()
-            .setHostnameVerifier(SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER)
+            .setHostnameVerifier(NoopHostnameVerifier.INSTANCE)
             .setSslContext(sslContext)
             .build();
 
@@ -201,7 +199,7 @@ class HttpAsyncClientLiveTest extends GetRequestMockServer {
         @Override
         public void run() {
             try {
-                final Future<SimpleHttpResponse> future = client.execute(SimpleHttpRequest.copy(request), context, null);
+                final Future<SimpleHttpResponse> future = client.execute(SimpleRequestBuilder.copy(request).build(), context, null);
                 final HttpResponse response = future.get();
                 assertThat(response.getCode(), equalTo(200));
             } catch (final Exception ex) {

apache-httpclient/src/test/java/com/baeldung/httpclient/ResponseUtil.java

@@ -1,10 +1,10 @@
 package com.baeldung.httpclient;
 
-import org.apache.http.HttpEntity;
-import org.apache.http.client.methods.CloseableHttpResponse;
-
 import java.io.IOException;
 
+import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
+import org.apache.hc.core5.http.HttpEntity;
+
 public final class ResponseUtil {
     private ResponseUtil() {
     }

apache-httpclient/src/test/java/com/baeldung/httpclient/advancedconfig/HttpClientAdvancedConfigurationIntegrationTest.java

@@ -103,7 +103,7 @@ class HttpClientAdvancedConfigurationIntegrationTest {
     void givenServerThatIsBehindProxy_whenClientIsConfiguredToSendRequestViaProxy_shouldReturn200() throws IOException {
         //given
         proxyMock.stubFor(get(urlMatching(".*"))
-          .willReturn(aResponse().proxiedFrom("http://localhost:8089/")));
+          .willReturn(aResponse().proxiedFrom("http://localhost:8089")));
 
         serviceMock.stubFor(get(urlEqualTo("/private"))
           .willReturn(aResponse().withStatus(200)));
@@ -129,7 +129,7 @@ class HttpClientAdvancedConfigurationIntegrationTest {
     public void givenServerThatIsBehindAuthorizationProxy_whenClientSendRequest_shouldAuthorizeProperly() throws IOException {
         //given
         proxyMock.stubFor(get(urlMatching("/private"))
-          .willReturn(aResponse().proxiedFrom("http://localhost:8089/")));
+          .willReturn(aResponse().proxiedFrom("http://localhost:8089")));
         serviceMock.stubFor(get(urlEqualTo("/private"))
           .willReturn(aResponse().withStatus(200)));
 

apache-httpclient4/pom.xml

@@ -158,7 +158,7 @@
             <version>${mockserver.version}</version>
         </dependency>
         <dependency>
-            <groupId>com.github.tomakehurst</groupId>
+            <groupId>org.wiremock</groupId>
             <artifactId>wiremock</artifactId>
             <version>${wiremock.version}</version>
             <scope>test</scope>
@@ -234,10 +234,10 @@
 
     <properties>
         <!-- util -->
-        <commons-codec.version>1.10</commons-codec.version>
+        <commons-codec.version>1.16.0</commons-codec.version>
         <httpasyncclient.version>4.1.5</httpasyncclient.version>
         <!-- testing -->
-        <wiremock.version>2.5.1</wiremock.version>
+        <wiremock.version>3.3.1</wiremock.version>
         <httpcore.version>4.4.16</httpcore.version>
         <httpclient.version>4.5.14</httpclient.version>
         <mockserver.version>5.11.2</mockserver.version>

apache-httpclient4/src/main/java/com/baeldung/filter/CustomWebSecurityConfigurerAdapter.java

@@ -7,14 +7,14 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;
 
 @Configuration
 @EnableWebSecurity
-public class CustomWebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapter {
+public class CustomWebSecurityConfigurerAdapter {
 
     @Autowired private RestAuthenticationEntryPoint authenticationEntryPoint;
 
@@ -27,8 +27,8 @@ public class CustomWebSecurityConfigurerAdapter extends WebSecurityConfigurerAda
           .authorities("ROLE_USER");
     }
 
-    @Override
+    @Bean
-    protected void configure(HttpSecurity http) throws Exception {
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
         http
           .authorizeRequests()
           .antMatchers("/securityNone")
@@ -40,6 +40,8 @@ public class CustomWebSecurityConfigurerAdapter extends WebSecurityConfigurerAda
           .authenticationEntryPoint(authenticationEntryPoint);
 
         http.addFilterAfter(new CustomFilter(), BasicAuthenticationFilter.class);
+
+        return http.build();
     }
     
     @Bean

apache-httpclient4/src/test/java/com/baeldung/httpclient/advancedconfig/HttpClientAdvancedConfigurationIntegrationTest.java

@@ -102,7 +102,7 @@ class HttpClientAdvancedConfigurationIntegrationTest {
     void givenServerThatIsBehindProxy_whenClientIsConfiguredToSendRequestViaProxy_shouldReturn200() throws IOException {
         //given
         proxyMock.stubFor(get(urlMatching(".*"))
-          .willReturn(aResponse().proxiedFrom("http://localhost:8089/")));
+          .willReturn(aResponse().proxiedFrom("http://localhost:8089")));
 
         serviceMock.stubFor(get(urlEqualTo("/private"))
           .willReturn(aResponse().withStatus(200)));
@@ -128,7 +128,7 @@ class HttpClientAdvancedConfigurationIntegrationTest {
     void givenServerThatIsBehindAuthorizationProxy_whenClientSendRequest_shouldAuthorizeProperly() throws IOException {
         //given
         proxyMock.stubFor(get(urlMatching("/private"))
-          .willReturn(aResponse().proxiedFrom("http://localhost:8089/")));
+          .willReturn(aResponse().proxiedFrom("http://localhost:8089")));
         serviceMock.stubFor(get(urlEqualTo("/private"))
           .willReturn(aResponse().withStatus(200)));
 

apache-kafka-2/README.md

@@ -13,3 +13,5 @@ You can build the project from the command line using: *mvn clean install*, or i
 - [Read Data From the Beginning Using Kafka Consumer API](https://www.baeldung.com/java-kafka-consumer-api-read)
 - [Get Partition Count for a Topic in Kafka](https://www.baeldung.com/java-kafka-partition-count-topic)
 - [bootstrap-server in Kafka Configuration](https://www.baeldung.com/java-kafka-bootstrap-server)
+- [Introduction to Apache Kafka](https://www.baeldung.com/apache-kafka)
+- [Ensuring Message Ordering in Kafka: Strategies and Configurations](https://www.baeldung.com/kafka-message-ordering)

apache-kafka-2/log4j.properties

@@ -1 +0,0 @@
-log4j.rootLogger=INFO, stdout

apache-kafka-2/pom.xml

@@ -23,11 +23,6 @@
             <artifactId>slf4j-api</artifactId>
             <version>${org.slf4j.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-log4j12</artifactId>
-            <version>${org.slf4j.version}</version>
-        </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
@@ -57,13 +52,19 @@
             <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.databind.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
         <jna.version>5.7.0</jna.version>
         <kafka.version>2.8.0</kafka.version>
-        <testcontainers-kafka.version>1.15.3</testcontainers-kafka.version>
+        <testcontainers-kafka.version>1.19.3</testcontainers-kafka.version>
         <testcontainers-jupiter.version>1.15.3</testcontainers-jupiter.version>
+        <jackson.databind.version>2.15.2</jackson.databind.version>
     </properties>
 
 </project>

apache-kafka-2/src/main/java/com/baeldung/kafka/message/ordering/Config.java

@@ -0,0 +1,11 @@
+package com.baeldung.kafka.message.ordering;
+
+public class Config {
+    public static final String CONSUMER_VALUE_DESERIALIZER_SERIALIZED_CLASS = "value.deserializer.serializedClass";
+    public static final String MULTI_PARTITION_TOPIC = "multi_partition_topic";
+    public static final String SINGLE_PARTITION_TOPIC = "single_partition_topic";
+
+    public static final int MULTIPLE_PARTITIONS = 5;
+    public static final int SINGLE_PARTITION = 1;
+    public static final short REPLICATION_FACTOR = 1;
+}

apache-kafka-2/src/main/java/com/baeldung/kafka/message/ordering/payload/UserEvent.java

@@ -0,0 +1,61 @@
+package com.baeldung.kafka.message.ordering.payload;
+
+import java.util.Objects;
+
+public class UserEvent implements Comparable<UserEvent> {
+    private String userEventId;
+    private long eventNanoTime;
+    private long globalSequenceNumber;
+
+    @SuppressWarnings("unused")
+    public UserEvent() {
+        // Required for Jackson Serialization and Deserialization
+    }
+
+    public UserEvent(String userEventId) {
+        this.userEventId = userEventId;
+    }
+
+    public String getUserEventId() {
+        return userEventId;
+    }
+
+    public long getEventNanoTime() {
+        return eventNanoTime;
+    }
+
+    public void setEventNanoTime(long eventNanoTime) {
+        this.eventNanoTime = eventNanoTime;
+    }
+
+    public long getGlobalSequenceNumber() {
+        return globalSequenceNumber;
+    }
+
+    public void setGlobalSequenceNumber(long globalSequenceNumber) {
+        this.globalSequenceNumber = globalSequenceNumber;
+    }
+
+    @Override
+    public int compareTo(UserEvent other) {
+        return Long.compare(this.globalSequenceNumber, other.globalSequenceNumber);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof UserEvent)) {
+            return false;
+        }
+        UserEvent userEvent = (UserEvent) obj;
+        return this.globalSequenceNumber == userEvent.globalSequenceNumber;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(globalSequenceNumber);
+    }
+}
+

apache-kafka-2/src/main/java/com/baeldung/kafka/message/ordering/serialization/JacksonDeserializer.java

@@ -0,0 +1,34 @@
+package com.baeldung.kafka.message.ordering.serialization;
+
+import com.baeldung.kafka.message.ordering.Config;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.apache.kafka.common.serialization.Deserializer;
+
+import java.util.Map;
+
+/**
+ * Configured via {@link org.apache.kafka.clients.consumer.ConsumerConfig#VALUE_DESERIALIZER_CLASS_CONFIG}
+ */
+public class JacksonDeserializer<T> implements Deserializer<T> {
+    private final ObjectMapper objectMapper = new ObjectMapper();
+    private Class<T> type;
+
+    @Override
+    public void configure(Map<String, ?> configs, boolean isKey) {
+        this.type = (Class<T>) configs.get(Config.CONSUMER_VALUE_DESERIALIZER_SERIALIZED_CLASS);
+    }
+
+    @Override
+    public T deserialize(String topic, byte[] bytes) {
+        if (bytes == null) {
+            return null;
+        }
+        try {
+            return objectMapper.readValue(bytes, type);
+        } catch (Exception e) {
+            throw new RuntimeException("Error deserializing value", e);
+        }
+    }
+}
+

apache-kafka-2/src/main/java/com/baeldung/kafka/message/ordering/serialization/JacksonSerializer.java

@@ -0,0 +1,24 @@
+package com.baeldung.kafka.message.ordering.serialization;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.apache.kafka.common.serialization.Serializer;
+
+/**
+ * Configured via {@link org.apache.kafka.clients.producer.ProducerConfig#VALUE_SERIALIZER_CLASS_CONFIG}
+ */
+public class JacksonSerializer<T> implements Serializer<T> {
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public byte[] serialize(String topic, T data) {
+        if (data == null) {
+            return null;
+        }
+        try {
+            return objectMapper.writeValueAsBytes(data);
+        } catch (Exception e) {
+            throw new RuntimeException("Error serializing value", e);
+        }
+    }
+}

apache-kafka-2/src/test/java/com/baeldung/kafka/message/ordering/ExternalSequenceWithTimeWindowLiveTest.java

@@ -0,0 +1,126 @@
+package com.baeldung.kafka.message.ordering;
+
+import com.baeldung.kafka.message.ordering.payload.UserEvent;
+import com.baeldung.kafka.message.ordering.serialization.JacksonDeserializer;
+import com.baeldung.kafka.message.ordering.serialization.JacksonSerializer;
+
+import org.apache.kafka.clients.admin.*;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.clients.producer.RecordMetadata;
+import org.apache.kafka.common.serialization.LongDeserializer;
+import org.apache.kafka.common.serialization.LongSerializer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testcontainers.containers.KafkaContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+import java.time.Duration;
+import java.util.*;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+import com.google.common.collect.ImmutableList;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@Testcontainers
+public class ExternalSequenceWithTimeWindowLiveTest {
+
+    private static Admin admin;
+    private static KafkaProducer<Long, UserEvent> producer;
+    private static KafkaConsumer<Long, UserEvent> consumer;
+    private static final Duration TIMEOUT_WAIT_FOR_MESSAGES = Duration.ofSeconds(5);
+    private static final long BUFFER_PERIOD_NS = Duration.ofSeconds(5)
+        .toNanos();
+    private static Logger logger = LoggerFactory.getLogger(ExternalSequenceWithTimeWindowLiveTest.class);
+
+    @Container
+    private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:latest"));
+
+    @BeforeAll
+    static void setup() throws ExecutionException, InterruptedException {
+        KAFKA_CONTAINER.addExposedPort(9092);
+
+        Properties adminProperties = new Properties();
+        adminProperties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+
+        Properties producerProperties = new Properties();
+        producerProperties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        producerProperties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, LongSerializer.class.getName());
+        producerProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JacksonSerializer.class.getName());
+
+        Properties consumerProperties = new Properties();
+        consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JacksonDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+        consumerProperties.put(Config.CONSUMER_VALUE_DESERIALIZER_SERIALIZED_CLASS, UserEvent.class);
+        consumerProperties.put(ConsumerConfig.GROUP_ID_CONFIG, "test-group");
+        admin = Admin.create(adminProperties);
+        producer = new KafkaProducer<>(producerProperties);
+        consumer = new KafkaConsumer<>(consumerProperties);
+        admin.createTopics(ImmutableList.of(new NewTopic(Config.MULTI_PARTITION_TOPIC, Config.MULTIPLE_PARTITIONS, Config.REPLICATION_FACTOR)))
+            .all()
+            .get();
+    }
+
+    @AfterAll
+    static void destroy() {
+        KAFKA_CONTAINER.stop();
+    }
+
+    @Test
+    void givenMultiplePartitions_whenPublishedToKafkaAndConsumedWithExtSeqNumberAndTimeWindow_thenCheckForMessageOrder() throws ExecutionException, InterruptedException {
+        List<UserEvent> sentUserEventList = new ArrayList<>();
+        List<UserEvent> receivedUserEventList = new ArrayList<>();
+        for (long sequenceNumber = 1; sequenceNumber <= 10; sequenceNumber++) {
+            UserEvent userEvent = new UserEvent(UUID.randomUUID()
+                .toString());
+            userEvent.setEventNanoTime(System.nanoTime());
+            userEvent.setGlobalSequenceNumber(sequenceNumber);
+            Future<RecordMetadata> future = producer.send(new ProducerRecord<>(Config.MULTI_PARTITION_TOPIC, sequenceNumber, userEvent));
+            sentUserEventList.add(userEvent);
+            RecordMetadata metadata = future.get();
+            logger.info("User Event ID: " + userEvent.getUserEventId() + ", Partition : " + metadata.partition());
+        }
+
+        consumer.subscribe(Collections.singletonList(Config.MULTI_PARTITION_TOPIC));
+        List<UserEvent> buffer = new ArrayList<>();
+        long lastProcessedTime = System.nanoTime();
+        ConsumerRecords<Long, UserEvent> records = consumer.poll(TIMEOUT_WAIT_FOR_MESSAGES);
+        records.forEach(record -> {
+            buffer.add(record.value());
+        });
+        while (!buffer.isEmpty()) {
+            if (System.nanoTime() - lastProcessedTime > BUFFER_PERIOD_NS) {
+                processBuffer(buffer, receivedUserEventList);
+                lastProcessedTime = System.nanoTime();
+            }
+            records = consumer.poll(TIMEOUT_WAIT_FOR_MESSAGES);
+            records.forEach(record -> {
+                buffer.add(record.value());
+            });
+        }
+        assertThat(receivedUserEventList).isEqualTo(sentUserEventList)
+            .containsExactlyElementsOf(sentUserEventList);
+    }
+
+    private static void processBuffer(List<UserEvent> buffer, List<UserEvent> receivedUserEventList) {
+        Collections.sort(buffer);
+        buffer.forEach(userEvent -> {
+            receivedUserEventList.add(userEvent);
+            logger.info("Processing message with Global Sequence number: " + userEvent.getGlobalSequenceNumber() + ", User Event Id: " + userEvent.getUserEventId());
+        });
+        buffer.clear();
+    }
+}

apache-kafka-2/src/test/java/com/baeldung/kafka/message/ordering/MultiplePartitionLiveTest.java

@@ -0,0 +1,105 @@
+package com.baeldung.kafka.message.ordering;
+
+import com.baeldung.kafka.message.ordering.payload.UserEvent;
+import com.baeldung.kafka.message.ordering.serialization.JacksonDeserializer;
+import com.baeldung.kafka.message.ordering.serialization.JacksonSerializer;
+
+import org.apache.kafka.clients.admin.*;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.clients.producer.RecordMetadata;
+import org.apache.kafka.common.serialization.LongDeserializer;
+import org.apache.kafka.common.serialization.LongSerializer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testcontainers.containers.KafkaContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+import java.time.Duration;
+import java.util.*;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+import com.google.common.collect.ImmutableList;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@Testcontainers
+public class MultiplePartitionLiveTest {
+
+    private static Admin admin;
+    private static KafkaProducer<Long, UserEvent> producer;
+    private static KafkaConsumer<Long, UserEvent> consumer;
+    private static final Duration TIMEOUT_WAIT_FOR_MESSAGES = Duration.ofSeconds(5);
+
+    private static Logger logger = LoggerFactory.getLogger(MultiplePartitionLiveTest.class);
+    @Container
+    private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:latest"));
+
+    @BeforeAll
+    static void setup() throws ExecutionException, InterruptedException {
+        KAFKA_CONTAINER.addExposedPort(9092);
+
+        Properties adminProperties = new Properties();
+        adminProperties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+
+        Properties producerProperties = new Properties();
+        producerProperties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        producerProperties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, LongSerializer.class.getName());
+        producerProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JacksonSerializer.class.getName());
+
+        Properties consumerProperties = new Properties();
+        consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JacksonDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+        consumerProperties.put(Config.CONSUMER_VALUE_DESERIALIZER_SERIALIZED_CLASS, UserEvent.class);
+        consumerProperties.put(ConsumerConfig.GROUP_ID_CONFIG, "test-group");
+        admin = Admin.create(adminProperties);
+        producer = new KafkaProducer<>(producerProperties);
+        consumer = new KafkaConsumer<>(consumerProperties);
+        admin.createTopics(ImmutableList.of(new NewTopic(Config.MULTI_PARTITION_TOPIC, Config.MULTIPLE_PARTITIONS, Config.REPLICATION_FACTOR)))
+            .all()
+            .get();
+    }
+
+    @AfterAll
+    static void destroy() {
+        KAFKA_CONTAINER.stop();
+    }
+
+    @Test
+    void givenMultiplePartitions_whenPublishedToKafkaAndConsumed_thenCheckForMessageOrder() throws ExecutionException, InterruptedException {
+        List<UserEvent> sentUserEventList = new ArrayList<>();
+        List<UserEvent> receivedUserEventList = new ArrayList<>();
+        for (long sequenceNumber = 1; sequenceNumber <= 10; sequenceNumber++) {
+            UserEvent userEvent = new UserEvent(UUID.randomUUID()
+                .toString());
+            userEvent.setGlobalSequenceNumber(sequenceNumber);
+            userEvent.setEventNanoTime(System.nanoTime());
+            Future<RecordMetadata> future = producer.send(new ProducerRecord<>(Config.MULTI_PARTITION_TOPIC, sequenceNumber, userEvent));
+            sentUserEventList.add(userEvent);
+            RecordMetadata metadata = future.get();
+            logger.info("User Event ID: " + userEvent.getUserEventId() + ", Partition : " + metadata.partition());
+        }
+
+        consumer.subscribe(Collections.singletonList(Config.MULTI_PARTITION_TOPIC));
+        ConsumerRecords<Long, UserEvent> records = consumer.poll(TIMEOUT_WAIT_FOR_MESSAGES);
+        records.forEach(record -> {
+            UserEvent userEvent = record.value();
+            receivedUserEventList.add(userEvent);
+            logger.info("User Event ID: " + userEvent.getUserEventId());
+        });
+        assertThat(receivedUserEventList).isNotEqualTo(sentUserEventList)
+            .containsExactlyInAnyOrderElementsOf(sentUserEventList);
+    }
+}

apache-kafka-2/src/test/java/com/baeldung/kafka/message/ordering/SinglePartitionLiveTest.java

@@ -0,0 +1,109 @@
+package com.baeldung.kafka.message.ordering;
+
+import com.baeldung.kafka.message.ordering.payload.UserEvent;
+import com.baeldung.kafka.message.ordering.serialization.JacksonDeserializer;
+import com.baeldung.kafka.message.ordering.serialization.JacksonSerializer;
+
+import org.apache.kafka.clients.admin.Admin;
+import org.apache.kafka.clients.admin.AdminClientConfig;
+import org.apache.kafka.clients.admin.NewTopic;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.clients.producer.RecordMetadata;
+import org.apache.kafka.common.serialization.LongDeserializer;
+import org.apache.kafka.common.serialization.LongSerializer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testcontainers.containers.KafkaContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+import java.time.Duration;
+import java.util.*;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+import com.google.common.collect.ImmutableList;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@Testcontainers
+public class SinglePartitionLiveTest {
+
+    private static Admin admin;
+    private static KafkaProducer<Long, UserEvent> producer;
+    private static KafkaConsumer<Long, UserEvent> consumer;
+
+    private static final Duration TIMEOUT_WAIT_FOR_MESSAGES = Duration.ofSeconds(5);
+
+    private static Logger logger = LoggerFactory.getLogger(SinglePartitionLiveTest.class);
+    @Container
+    private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:latest"));
+
+    @BeforeAll
+    static void setup() throws ExecutionException, InterruptedException {
+        KAFKA_CONTAINER.addExposedPort(9092);
+
+        Properties adminProperties = new Properties();
+        adminProperties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+
+        Properties producerProperties = new Properties();
+        producerProperties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        producerProperties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, LongSerializer.class.getName());
+        producerProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JacksonSerializer.class.getName());
+
+        Properties consumerProperties = new Properties();
+        consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, LongDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JacksonDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+        consumerProperties.put(Config.CONSUMER_VALUE_DESERIALIZER_SERIALIZED_CLASS, UserEvent.class);
+        consumerProperties.put(ConsumerConfig.GROUP_ID_CONFIG, "test-group");
+        admin = Admin.create(adminProperties);
+        producer = new KafkaProducer<>(producerProperties);
+        consumer = new KafkaConsumer<>(consumerProperties);
+        admin.createTopics(ImmutableList.of(new NewTopic(Config.SINGLE_PARTITION_TOPIC, Config.SINGLE_PARTITION, Config.REPLICATION_FACTOR)))
+            .all()
+            .get();
+    }
+
+    @AfterAll
+    static void destroy() {
+        KAFKA_CONTAINER.stop();
+    }
+
+    @Test
+    void givenASinglePartition_whenPublishedToKafkaAndConsumed_thenCheckForMessageOrder() throws ExecutionException, InterruptedException {
+        List<UserEvent> sentUserEventList = new ArrayList<>();
+        List<UserEvent> receivedUserEventList = new ArrayList<>();
+        for (long sequenceNumber = 1; sequenceNumber <= 10; sequenceNumber++) {
+            UserEvent userEvent = new UserEvent(UUID.randomUUID()
+                .toString());
+            userEvent.setGlobalSequenceNumber(sequenceNumber);
+            userEvent.setEventNanoTime(System.nanoTime());
+            ProducerRecord<Long, UserEvent> producerRecord = new ProducerRecord<>(Config.SINGLE_PARTITION_TOPIC, userEvent);
+            Future<RecordMetadata> future = producer.send(producerRecord);
+            sentUserEventList.add(userEvent);
+            RecordMetadata metadata = future.get();
+            logger.info("User Event ID: " + userEvent.getUserEventId() + ", Partition : " + metadata.partition());
+        }
+
+        consumer.subscribe(Collections.singletonList(Config.SINGLE_PARTITION_TOPIC));
+        ConsumerRecords<Long, UserEvent> records = consumer.poll(TIMEOUT_WAIT_FOR_MESSAGES);
+        records.forEach(record -> {
+            UserEvent userEvent = record.value();
+            receivedUserEventList.add(userEvent);
+            logger.info("User Event ID: " + userEvent.getUserEventId());
+        });
+        assertThat(receivedUserEventList).isEqualTo(sentUserEventList)
+            .containsExactlyElementsOf(sentUserEventList);
+    }
+}

apache-kafka-2/src/test/java/com/baeldung/kafka/multipletopics/MultipleTopicsLiveTest.java

@@ -0,0 +1,103 @@
+package com.baeldung.kafka.multipletopics;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Properties;
+import java.util.concurrent.ExecutionException;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testcontainers.containers.KafkaContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+// This live test needs a Docker Daemon running so that a kafka container can be created
+
+@Testcontainers
+public class MultipleTopicsLiveTest {
+
+    private final Logger log = LoggerFactory.getLogger(MultipleTopicsLiveTest.class);
+
+    private static final String CARD_PAYMENTS_TOPIC = "card-payments";
+    private static final String BANK_TRANSFERS_TOPIC = "bank-transfers";
+    private static KafkaProducer<String, String> producer;
+    private static KafkaConsumer<String, String> consumer;
+
+    @Container
+    private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:latest"));
+
+    @BeforeAll
+    static void setup() {
+        KAFKA_CONTAINER.addExposedPort(9092);
+        producer = new KafkaProducer<>(getProducerProperties());
+        consumer = new KafkaConsumer<>(getConsumerProperties());
+    }
+
+    @AfterAll
+    static void destroy() {
+        KAFKA_CONTAINER.stop();
+    }
+
+    private static Properties getProducerProperties() {
+        Properties producerProperties = new Properties();
+        producerProperties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        producerProperties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
+        producerProperties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
+        return producerProperties;
+    }
+
+    private static Properties getConsumerProperties() {
+        Properties consumerProperties = new Properties();
+        consumerProperties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
+        consumerProperties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
+        consumerProperties.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+        consumerProperties.put(ConsumerConfig.GROUP_ID_CONFIG, "payments");
+        return consumerProperties;
+    }
+
+    @Test
+    void whenSendingMessagesOnTwoTopics_thenConsumerReceivesMessages() throws Exception {
+        publishMessages();
+
+        consumer.subscribe(Arrays.asList(CARD_PAYMENTS_TOPIC, BANK_TRANSFERS_TOPIC));
+
+        int eventsProcessed = 0;
+        for (ConsumerRecord<String, String> record : consumer.poll(Duration.ofSeconds(10))) {
+            log.info("Event on topic={}, payload={}", record.topic(), record.value());
+            eventsProcessed++;
+        }
+
+        assertThat(eventsProcessed).isEqualTo(2);
+    }
+
+    private void publishMessages() throws ExecutionException, InterruptedException {
+        ProducerRecord<String, String> cardPayment = new ProducerRecord<>(CARD_PAYMENTS_TOPIC, createCardPayment());
+        producer.send(cardPayment).get();
+
+        ProducerRecord<String, String> bankTransfer = new ProducerRecord<>(BANK_TRANSFERS_TOPIC, createBankTransfer());
+        producer.send(bankTransfer).get();
+    }
+
+    private String createCardPayment() {
+        return "{\"paymentReference\":\"A184028KM0013790\", \"type\":\"card\", \"amount\":\"275\", \"currency\":\"GBP\"}";
+    }
+
+    private String createBankTransfer() {
+        return "{\"paymentReference\":\"19ae2-18mk73-009\", \"type\":\"bank\", \"amount\":\"150\", \"currency\":\"EUR\"}";
+    }
+}

apache-kafka-2/src/test/resources/logback.xml

@@ -0,0 +1,11 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

apache-kafka/pom.xml

@@ -181,8 +181,9 @@
     </build>
 
     <properties>
+        <jackson.version>2.13.4</jackson.version>
         <kafka.version>3.4.0</kafka.version>
-        <testcontainers-kafka.version>1.15.3</testcontainers-kafka.version>
+        <testcontainers-kafka.version>1.19.3</testcontainers-kafka.version>
         <testcontainers-jupiter.version>1.15.3</testcontainers-jupiter.version>
         <flink.version>1.16.1</flink.version>
         <awaitility.version>3.0.0</awaitility.version>

apache-kafka/src/test/java/com/baeldung/flink/BackupCreatorUnitTest.java

@@ -29,7 +29,7 @@ import java.util.List;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 
-public class BackupCreatorIntegrationTest {
+public class BackupCreatorUnitTest {
     public static ObjectMapper mapper;
 
     @Before

apache-kafka/src/test/java/com/baeldung/flink/WordCapitalizerUnitTest.java

@@ -10,7 +10,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class WordCapitalizerIntegrationTest {
+public class WordCapitalizerUnitTest {
 
     @Test
     public void givenDataSet_whenExecuteWordCapitalizer_thenReturnCapitalizedWords() throws Exception {

apache-kafka/src/test/java/com/baeldung/kafkastreams/KafkaStreamsLiveTest.java

@@ -21,8 +21,7 @@ import org.junit.Ignore;
 import org.junit.Test;
 
 public class KafkaStreamsLiveTest {
-    private String bootstrapServers = "localhost:9092";
+    private final String bootstrapServers = "localhost:9092";
-    private Path stateDirectory;
 
     @Test
     @Ignore("it needs to have kafka broker running on local")
@@ -44,8 +43,8 @@ public class KafkaStreamsLiveTest {
         
         // Use a temporary directory for storing state, which will be automatically removed after the test.
         try {
-            this.stateDirectory = Files.createTempDirectory("kafka-streams");
+            Path stateDirectory = Files.createTempDirectory("kafka-streams");
-            streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, this.stateDirectory.toAbsolutePath()
+            streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, stateDirectory.toAbsolutePath()
                 .toString());
         } catch (final IOException e) {
             throw new UncheckedIOException("Cannot create temporary directory", e);

apache-libraries/pom.xml

@@ -191,7 +191,7 @@
         <bval.version>2.0.6</bval.version>
         <javax.validation.validation-api.version>2.0.1.Final</javax.validation.validation-api.version>
         <meecrowave-junit.version>1.2.15</meecrowave-junit.version>
-        <okhttp.version>3.10.0</okhttp.version>
+        <okhttp.version>4.12.0</okhttp.version>
         <meecrowave-jpa.version>1.2.15</meecrowave-jpa.version>
         <meecrowave-core.version>1.2.15</meecrowave-core.version>
         <meecrowave-maven-plugin.version>1.2.15</meecrowave-maven-plugin.version>

aws-modules/aws-dynamodb/.gitignore

@@ -0,0 +1,2 @@
+/target/
+.idea/

aws-modules/aws-dynamodb/README.md

@@ -0,0 +1,7 @@
+## AWS DYNAMODB
+
+This module contains articles about AWS DynamoDB
+
+### Relevant articles
+- [Integration Testing with a Local DynamoDB Instance](https://www.baeldung.com/dynamodb-local-integration-tests)
+

aws-modules/aws-dynamodb/pom.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>aws-dynamodb</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>aws-dynamodb</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>aws-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.amazonaws</groupId>
+            <artifactId>aws-java-sdk</artifactId>
+            <version>${aws-java-sdk.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.amazonaws</groupId>
+            <artifactId>DynamoDBLocal</artifactId>
+            <version>${dynamodblocal.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>${gson.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>${maven-plugins-version}</version>
+                <executions>
+                    <execution>
+                        <id>copy</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <includeScope></includeScope>
+                            <includeTypes>so,dll,dylib</includeTypes>
+                            <outputDirectory>native-libs</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <gson.version>2.10.1</gson.version>
+        <dynamodblocal.version>1.21.1</dynamodblocal.version>
+        <maven-plugins-version>3.1.1</maven-plugins-version>
+    </properties>
+
+</project>

aws-modules/aws-miscellaneous/README.md

@@ -5,6 +5,5 @@ This module contains articles about various Amazon Web Services (AWS) such as EC
 ### Relevant articles
 
 - [Managing EC2 Instances in Java](https://www.baeldung.com/ec2-java)
-- [Integration Testing with a Local DynamoDB Instance](https://www.baeldung.com/dynamodb-local-integration-tests)
 - [Managing Amazon SQS Queues in Java](https://www.baeldung.com/aws-queues-java)
 - [Guide to AWS Aurora RDS with Java](https://www.baeldung.com/aws-aurora-rds-java)

aws-modules/aws-miscellaneous/pom.xml

@@ -16,31 +16,9 @@
 
     <dependencies>
         <dependency>
-            <groupId>com.amazonaws</groupId>
+            <groupId>software.amazon.awssdk</groupId>
-            <artifactId>aws-java-sdk</artifactId>
+            <artifactId>aws-sdk-java</artifactId>
-            <version>${aws-java-sdk.version}</version>
+            <version>${aws-java-sdk-v2.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.amazonaws</groupId>
-            <artifactId>aws-lambda-java-core</artifactId>
-            <version>${aws-lambda-java-core.version}</version>
-            <exclusions>
-                <exclusion>
-                    <artifactId>commons-logging</artifactId>
-                    <groupId>commons-logging</groupId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>com.amazonaws</groupId>
-            <artifactId>aws-lambda-java-events</artifactId>
-            <version>${aws-lambda-java-events.version}</version>
-            <exclusions>
-                <exclusion>
-                    <artifactId>commons-logging</artifactId>
-                    <groupId>commons-logging</groupId>
-                </exclusion>
-            </exclusions>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>
@@ -52,32 +30,10 @@
             <artifactId>gson</artifactId>
             <version>${gson.version}</version>
         </dependency>
-        <dependency>
-            <groupId>com.amazonaws</groupId>
-            <artifactId>DynamoDBLocal</artifactId>
-            <version>${dynamodblocal.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 
     <build>
         <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <version>${maven-shade-plugin.version}</version>
-                <configuration>
-                    <createDependencyReducedPom>false</createDependencyReducedPom>
-                </configuration>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
@@ -101,11 +57,9 @@
     </build>
 
     <properties>
-        <aws-lambda-java-events.version>1.3.0</aws-lambda-java-events.version>
+        <gson.version>2.10.1</gson.version>
-        <aws-lambda-java-core.version>1.1.0</aws-lambda-java-core.version>
-        <gson.version>2.8.0</gson.version>
         <dynamodblocal.version>1.21.1</dynamodblocal.version>
-        <commons-codec-version>1.10.L001</commons-codec-version>
+        <commons-codec-version>1.16.0</commons-codec-version>
         <jets3t-version>0.9.4.0006L</jets3t-version>
         <maven-plugins-version>3.1.1</maven-plugins-version>
     </properties>

aws-modules/aws-miscellaneous/src/main/java/com/baeldung/ec2/EC2Application.java

@@ -2,136 +2,148 @@ package com.baeldung.ec2;
 
 import java.util.Arrays;
 
-import com.amazonaws.auth.AWSCredentials;
+import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
-import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import software.amazon.awssdk.regions.Region;
-import com.amazonaws.auth.BasicAWSCredentials;
+import software.amazon.awssdk.services.ec2.Ec2Client;
-import com.amazonaws.regions.Regions;
+import software.amazon.awssdk.services.ec2.model.AuthorizeSecurityGroupIngressRequest;
-import com.amazonaws.services.ec2.AmazonEC2;
+import software.amazon.awssdk.services.ec2.model.CreateKeyPairRequest;
-import com.amazonaws.services.ec2.AmazonEC2ClientBuilder;
+import software.amazon.awssdk.services.ec2.model.CreateKeyPairResponse;
-import com.amazonaws.services.ec2.model.AuthorizeSecurityGroupIngressRequest;
+import software.amazon.awssdk.services.ec2.model.CreateSecurityGroupRequest;
-import com.amazonaws.services.ec2.model.CreateKeyPairRequest;
+import software.amazon.awssdk.services.ec2.model.DescribeInstancesRequest;
-import com.amazonaws.services.ec2.model.CreateKeyPairResult;
+import software.amazon.awssdk.services.ec2.model.DescribeInstancesResponse;
-import com.amazonaws.services.ec2.model.CreateSecurityGroupRequest;
+import software.amazon.awssdk.services.ec2.model.DescribeKeyPairsRequest;
-import com.amazonaws.services.ec2.model.DescribeInstancesRequest;
+import software.amazon.awssdk.services.ec2.model.DescribeKeyPairsResponse;
-import com.amazonaws.services.ec2.model.DescribeInstancesResult;
+import software.amazon.awssdk.services.ec2.model.IpPermission;
-import com.amazonaws.services.ec2.model.DescribeKeyPairsRequest;
+import software.amazon.awssdk.services.ec2.model.IpRange;
-import com.amazonaws.services.ec2.model.DescribeKeyPairsResult;
+import software.amazon.awssdk.services.ec2.model.MonitorInstancesRequest;
-import com.amazonaws.services.ec2.model.IpPermission;
+import software.amazon.awssdk.services.ec2.model.RebootInstancesRequest;
-import com.amazonaws.services.ec2.model.IpRange;
+import software.amazon.awssdk.services.ec2.model.RunInstancesRequest;
-import com.amazonaws.services.ec2.model.MonitorInstancesRequest;
+import software.amazon.awssdk.services.ec2.model.RunInstancesResponse;
-import com.amazonaws.services.ec2.model.RebootInstancesRequest;
+import software.amazon.awssdk.services.ec2.model.StartInstancesRequest;
-import com.amazonaws.services.ec2.model.RunInstancesRequest;
+import software.amazon.awssdk.services.ec2.model.StartInstancesResponse;
-import com.amazonaws.services.ec2.model.StartInstancesRequest;
+import software.amazon.awssdk.services.ec2.model.StopInstancesRequest;
-import com.amazonaws.services.ec2.model.StopInstancesRequest;
+import software.amazon.awssdk.services.ec2.model.UnmonitorInstancesRequest;
-import com.amazonaws.services.ec2.model.UnmonitorInstancesRequest;
 
 public class EC2Application {
 
-    private static final AWSCredentials credentials;
-
-    static {
-        // put your accesskey and secretkey here
-        credentials = new BasicAWSCredentials(
-            "<AWS accesskey>", 
-            "<AWS secretkey>"
-        );
-    }
-
     public static void main(String[] args) {
        
         // Set up the client
-        AmazonEC2 ec2Client = AmazonEC2ClientBuilder.standard()
+        Ec2Client ec2Client = Ec2Client.builder()
-            .withCredentials(new AWSStaticCredentialsProvider(credentials))
+            .credentialsProvider(ProfileCredentialsProvider.create("default"))
-            .withRegion(Regions.US_EAST_1)
+            .region(Region.US_EAST_1)
             .build();
 
         // Create a security group
-        CreateSecurityGroupRequest createSecurityGroupRequest = new CreateSecurityGroupRequest().withGroupName("BaeldungSecurityGroup")
+        CreateSecurityGroupRequest createSecurityGroupRequest = CreateSecurityGroupRequest.builder()
-            .withDescription("Baeldung Security Group");
+            .groupName("BaeldungSecurityGroup")
+            .description("Baeldung Security Group")
+            .build();
+
         ec2Client.createSecurityGroup(createSecurityGroupRequest);
 
         // Allow HTTP and SSH traffic
-        IpRange ipRange1 = new IpRange().withCidrIp("0.0.0.0/0");
+        IpRange ipRange1 = IpRange.builder()
+            .cidrIp("0.0.0.0/0")
+            .build();
 
-        IpPermission ipPermission1 = new IpPermission().withIpv4Ranges(Arrays.asList(new IpRange[] { ipRange1 }))
+        IpPermission ipPermission1 = IpPermission.builder()
-            .withIpProtocol("tcp")
+            .ipRanges(Arrays.asList(ipRange1))
-            .withFromPort(80)
+            .ipProtocol("tcp")
-            .withToPort(80);
+            .fromPort(80)
+            .toPort(80)
+            .build();
 
-        IpPermission ipPermission2 = new IpPermission().withIpv4Ranges(Arrays.asList(new IpRange[] { ipRange1 }))
+        IpPermission ipPermission2 = IpPermission.builder()
-            .withIpProtocol("tcp")
+            .ipRanges(Arrays.asList(ipRange1))
-            .withFromPort(22)
+            .ipProtocol("tcp")
-            .withToPort(22);
+            .fromPort(22)
+            .toPort(22)
+            .build();
 
-        AuthorizeSecurityGroupIngressRequest authorizeSecurityGroupIngressRequest = new AuthorizeSecurityGroupIngressRequest()
+        AuthorizeSecurityGroupIngressRequest authorizeSecurityGroupIngressRequest = AuthorizeSecurityGroupIngressRequest
-            .withGroupName("BaeldungSecurityGroup")
+            .builder()
-            .withIpPermissions(ipPermission1, ipPermission2);
+            .groupName("BaeldungSecurityGroup")
+            .ipPermissions(ipPermission1, ipPermission2)
+            .build();
 
         ec2Client.authorizeSecurityGroupIngress(authorizeSecurityGroupIngressRequest);
 
         // Create KeyPair
-        CreateKeyPairRequest createKeyPairRequest = new CreateKeyPairRequest()
+        CreateKeyPairRequest createKeyPairRequest = CreateKeyPairRequest.builder()
-            .withKeyName("baeldung-key-pair");
+            .keyName("baeldung-key-pair")
-        CreateKeyPairResult createKeyPairResult = ec2Client.createKeyPair(createKeyPairRequest);
+            .build();
-        String privateKey = createKeyPairResult
+
-            .getKeyPair()
+        CreateKeyPairResponse createKeyPairResponse = ec2Client.createKeyPair(createKeyPairRequest);
-            .getKeyMaterial(); // make sure you keep it, the private key, Amazon doesn't store the private key
+        String privateKey = createKeyPairResponse.keyMaterial();
+        // make sure you keep it, the private key, Amazon doesn't store the private key
 
         // See what key-pairs you've got
-        DescribeKeyPairsRequest describeKeyPairsRequest = new DescribeKeyPairsRequest();
+        DescribeKeyPairsRequest describeKeyPairsRequest = DescribeKeyPairsRequest.builder()
-        DescribeKeyPairsResult describeKeyPairsResult = ec2Client.describeKeyPairs(describeKeyPairsRequest);
+            .build();
+        DescribeKeyPairsResponse describeKeyPairsResponse = ec2Client.describeKeyPairs(describeKeyPairsRequest);
 
         // Launch an Amazon Instance
-        RunInstancesRequest runInstancesRequest = new RunInstancesRequest().withImageId("ami-97785bed") // https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.html | https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/usingsharedamis-finding.html
+        RunInstancesRequest runInstancesRequest = RunInstancesRequest.builder()
-            .withInstanceType("t2.micro") // https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html
+            .imageId("ami-97785bed")
-            .withMinCount(1)
+            .instanceType("t2.micro") // https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html
-            .withMaxCount(1)
+            .minCount(1)
-            .withKeyName("baeldung-key-pair") // optional - if not present, can't connect to instance
+            .maxCount(1)
-            .withSecurityGroups("BaeldungSecurityGroup");
+            .keyName("baeldung-key-pair") // optional - if not present, can't connect to instance
+            .securityGroups("BaeldungSecurityGroup")
+            .build();
 
-        String yourInstanceId = ec2Client.runInstances(runInstancesRequest).getReservation().getInstances().get(0).getInstanceId();
+        RunInstancesResponse runInstancesResponse = ec2Client.runInstances(runInstancesRequest);
+        String yourInstanceId = runInstancesResponse.instances().get(0).instanceId();
 
         // Start an Instance
-        StartInstancesRequest startInstancesRequest = new StartInstancesRequest()
+        StartInstancesRequest startInstancesRequest = StartInstancesRequest.builder()
-            .withInstanceIds(yourInstanceId);
+            .instanceIds(yourInstanceId)
+            .build();
+
+        StartInstancesResponse startInstancesResponse = ec2Client.startInstances(startInstancesRequest);
 
-        ec2Client.startInstances(startInstancesRequest);
 
         // Monitor Instances
-        MonitorInstancesRequest monitorInstancesRequest = new MonitorInstancesRequest()
+        MonitorInstancesRequest monitorInstancesRequest = MonitorInstancesRequest.builder()
-            .withInstanceIds(yourInstanceId);
+            .instanceIds(yourInstanceId)
+            .build();
+
 
         ec2Client.monitorInstances(monitorInstancesRequest);
 
-        UnmonitorInstancesRequest unmonitorInstancesRequest = new UnmonitorInstancesRequest()
+        UnmonitorInstancesRequest unmonitorInstancesRequest = UnmonitorInstancesRequest.builder()
-            .withInstanceIds(yourInstanceId);
+            .instanceIds(yourInstanceId)
+            .build();
 
         ec2Client.unmonitorInstances(unmonitorInstancesRequest);
 
         // Reboot an Instance
-
+        RebootInstancesRequest rebootInstancesRequest = RebootInstancesRequest.builder()
-        RebootInstancesRequest rebootInstancesRequest = new RebootInstancesRequest()
+            .instanceIds(yourInstanceId)
-            .withInstanceIds(yourInstanceId);
+            .build();
 
         ec2Client.rebootInstances(rebootInstancesRequest);
 
         // Stop an Instance
-        StopInstancesRequest stopInstancesRequest = new StopInstancesRequest()
+        StopInstancesRequest stopInstancesRequest = StopInstancesRequest.builder()
-            .withInstanceIds(yourInstanceId);
+            .instanceIds(yourInstanceId)
+            .build();
+
 
         ec2Client.stopInstances(stopInstancesRequest)
-            .getStoppingInstances()
+            .stoppingInstances()
             .get(0)
-            .getPreviousState()
+            .previousState()
-            .getName();
+            .name();
 
         // Describe an Instance
-        DescribeInstancesRequest describeInstancesRequest = new DescribeInstancesRequest();
+        DescribeInstancesRequest describeInstancesRequest = DescribeInstancesRequest.builder().build();
-        DescribeInstancesResult response = ec2Client.describeInstances(describeInstancesRequest);
+        DescribeInstancesResponse response = ec2Client.describeInstances(describeInstancesRequest);
-        System.out.println(response.getReservations()
+        System.out.println(response.reservations()
             .get(0)
-            .getInstances()
+            .instances()
             .get(0)
-            .getKernelId());
+            .kernelId());
     }
 }

aws-modules/aws-miscellaneous/src/main/java/com/baeldung/rds/AWSRDSService.java

@@ -1,13 +1,5 @@
 package com.baeldung.rds;
 
-import com.amazonaws.auth.AWSCredentialsProvider;
-import com.amazonaws.auth.AWSStaticCredentialsProvider;
-import com.amazonaws.auth.BasicAWSCredentials;
-import com.amazonaws.regions.Regions;
-import com.amazonaws.services.rds.AmazonRDS;
-import com.amazonaws.services.rds.AmazonRDSClientBuilder;
-import com.amazonaws.services.rds.model.*;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.sql.*;
@@ -16,12 +8,22 @@ import java.util.Properties;
 import java.util.UUID;
 import java.util.logging.Logger;
 
+import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.rds.RdsClient;
+import software.amazon.awssdk.services.rds.model.CreateDbInstanceRequest;
+import software.amazon.awssdk.services.rds.model.CreateDbInstanceResponse;
+import software.amazon.awssdk.services.rds.model.DBInstance;
+import software.amazon.awssdk.services.rds.model.DeleteDbInstanceRequest;
+import software.amazon.awssdk.services.rds.model.DeleteDbInstanceResponse;
+import software.amazon.awssdk.services.rds.model.DescribeDbInstancesResponse;
+import software.amazon.awssdk.services.rds.model.Endpoint;
+
 public class AWSRDSService {
 
 
     final static Logger logger = Logger.getLogger(AWSRDSService.class.getName());
-    private AWSCredentialsProvider credentials;
+    private RdsClient rdsClient;
-    private AmazonRDS amazonRDS;
     private String db_username;
     private String db_password;
     private String db_database;
@@ -34,22 +36,17 @@ public class AWSRDSService {
     * **/
     public AWSRDSService() throws IOException {
         //Init RDS client with credentials and region.
-        credentials = new
-                AWSStaticCredentialsProvider(new
-                BasicAWSCredentials("<ACCESS_KEY>",
-                "<SECRET_KEY>"));
-        amazonRDS = AmazonRDSClientBuilder.standard().withCredentials(credentials)
-                .withRegion(Regions.AP_SOUTHEAST_2).build();
         Properties prop = new Properties();
         InputStream input = AWSRDSService.class.getClassLoader().getResourceAsStream("db.properties");
         prop.load(input);
         db_username = prop.getProperty("db_username");
         db_password = prop.getProperty("db_password");
         db_database = prop.getProperty("db_database");
-    }
 
-    public AWSRDSService(AmazonRDS amazonRDS){
+        rdsClient = RdsClient.builder()
-        this.amazonRDS = amazonRDS;
+            .region(Region.AP_SOUTHEAST_2)
+            .credentialsProvider(ProfileCredentialsProvider.create("default"))
+            .build();
     }
 
     /**
@@ -60,29 +57,29 @@ public class AWSRDSService {
     public String launchInstance() {
 
         String identifier = "";
-        CreateDBInstanceRequest request = new CreateDBInstanceRequest();
+        CreateDbInstanceRequest instanceRequest = CreateDbInstanceRequest.builder()
-        // RDS instance name
+            .dbInstanceIdentifier("Sydney")
-        request.setDBInstanceIdentifier("Sydney");
+            .engine("postgres")
-        request.setEngine("postgres");
+            .multiAZ(false)
-        request.setMultiAZ(false);
+            .masterUsername(db_username)
-        request.setMasterUsername(db_username);
+            .masterUserPassword(db_password)
-        request.setMasterUserPassword(db_password);
+            .dbName(db_database)
-        request.setDBName(db_database);
+            .storageType("gp2")
-        request.setStorageType("gp2");
+            .allocatedStorage(10)
-        request.setAllocatedStorage(10);
+            .build();
 
-        DBInstance instance = amazonRDS.createDBInstance(request);
+        CreateDbInstanceResponse createDbInstanceResponse = rdsClient.createDBInstance(instanceRequest);
 
         // Information about the new RDS instance
-        identifier = instance.getDBInstanceIdentifier();
+        identifier = createDbInstanceResponse.dbInstance().dbInstanceIdentifier();
-        String status = instance.getDBInstanceStatus();
+        String status = createDbInstanceResponse.dbInstance().dbInstanceStatus();
-        Endpoint endpoint = instance.getEndpoint();
+        Endpoint endpoint = createDbInstanceResponse.dbInstance().endpoint();
-        String endpoint_url = "Endpoint URL not available yet.";
+        String endpointUrl = "Endpoint URL not available yet.";
         if (endpoint != null) {
-            endpoint_url = endpoint.toString();
+            endpointUrl = endpoint.toString();
         }
         logger.info(identifier + "\t" + status);
-        logger.info(endpoint_url);
+        logger.info(endpointUrl);
 
         return identifier;
 
@@ -90,44 +87,44 @@ public class AWSRDSService {
 
     // Describe DB instances
     public void listInstances() {
-        DescribeDBInstancesResult result = amazonRDS.describeDBInstances();
+        DescribeDbInstancesResponse response = rdsClient.describeDBInstances();
-        List<DBInstance> instances = result.getDBInstances();
+        List<DBInstance> instances = response.dbInstances();
         for (DBInstance instance : instances) {
             // Information about each RDS instance
-            String identifier = instance.getDBInstanceIdentifier();
+            String identifier = instance.dbInstanceIdentifier();
-            String engine = instance.getEngine();
+            String engine = instance.engine();
-            String status = instance.getDBInstanceStatus();
+            String status = instance.dbInstanceStatus();
-            Endpoint endpoint = instance.getEndpoint();
+            Endpoint endpoint = instance.endpoint();
-            String endpoint_url = "Endpoint URL not available yet.";
+            String endpointUrl = "Endpoint URL not available yet.";
             if (endpoint != null) {
-                endpoint_url = endpoint.toString();
+                endpointUrl = endpoint.toString();
             }
             logger.info(identifier + "\t" + engine + "\t" + status);
-            logger.info("\t" + endpoint_url);
+            logger.info("\t" + endpointUrl);
         }
-
     }
 
     //Delete RDS instance
     public void terminateInstance(String identifier) {
 
-        DeleteDBInstanceRequest request = new DeleteDBInstanceRequest();
+        DeleteDbInstanceRequest request = DeleteDbInstanceRequest.builder()
-        request.setDBInstanceIdentifier(identifier);
+            .dbInstanceIdentifier(identifier)
-        request.setSkipFinalSnapshot(true);
+            .skipFinalSnapshot(true)
+            .build();
 
         // Delete the RDS instance
-        DBInstance instance = amazonRDS.deleteDBInstance(request);
+        DeleteDbInstanceResponse response = rdsClient.deleteDBInstance(request);
 
         // Information about the RDS instance being deleted
-        String status = instance.getDBInstanceStatus();
+        String status = response.dbInstance().dbInstanceStatus();
-        Endpoint endpoint = instance.getEndpoint();
+        Endpoint endpoint = response.dbInstance().endpoint();
-        String endpoint_url = "Endpoint URL not available yet.";
+        String endpointUrl = "Endpoint URL not available yet.";
         if (endpoint != null) {
-            endpoint_url = endpoint.toString();
+            endpointUrl = endpoint.toString();
         }
 
         logger.info(identifier + "\t" + status);
-        logger.info(endpoint_url);
+        logger.info(endpointUrl);
 
     }
 

aws-modules/aws-miscellaneous/src/main/java/com/baeldung/sqs/SQSApplication.java

@@ -5,140 +5,190 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import com.amazonaws.auth.AWSCredentials;
+import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
-import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import software.amazon.awssdk.regions.Region;
-import com.amazonaws.auth.BasicAWSCredentials;
+import software.amazon.awssdk.services.sqs.SqsClient;
-import com.amazonaws.regions.Regions;
+import software.amazon.awssdk.services.sqs.model.CreateQueueRequest;
-import com.amazonaws.services.sqs.AmazonSQSClientBuilder;
+import software.amazon.awssdk.services.sqs.model.DeleteMessageRequest;
-import com.amazonaws.services.sqs.model.CreateQueueRequest;
+import software.amazon.awssdk.services.sqs.model.GetQueueAttributesRequest;
-import com.amazonaws.services.sqs.model.DeleteMessageRequest;
+import software.amazon.awssdk.services.sqs.model.GetQueueAttributesResponse;
-import com.amazonaws.services.sqs.model.GetQueueAttributesRequest;
+import software.amazon.awssdk.services.sqs.model.GetQueueUrlRequest;
-import com.amazonaws.services.sqs.model.GetQueueAttributesResult;
+import software.amazon.awssdk.services.sqs.model.GetQueueUrlResponse;
-import com.amazonaws.services.sqs.model.MessageAttributeValue;
+import software.amazon.awssdk.services.sqs.model.Message;
-import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
+import software.amazon.awssdk.services.sqs.model.MessageAttributeValue;
-import com.amazonaws.services.sqs.model.SendMessageBatchRequest;
+import software.amazon.awssdk.services.sqs.model.QueueAttributeName;
-import com.amazonaws.services.sqs.model.SendMessageRequest;
+import software.amazon.awssdk.services.sqs.model.ReceiveMessageRequest;
-import com.amazonaws.services.sqs.model.SetQueueAttributesRequest;
+import software.amazon.awssdk.services.sqs.model.SendMessageBatchRequest;
-import com.amazonaws.services.sqs.model.SendMessageBatchRequestEntry;
+import software.amazon.awssdk.services.sqs.model.SendMessageBatchRequestEntry;
-import com.amazonaws.services.sqs.model.Message;
+import software.amazon.awssdk.services.sqs.model.SendMessageRequest;
-import com.amazonaws.services.sqs.AmazonSQS;
+import software.amazon.awssdk.services.sqs.model.SetQueueAttributesRequest;
 
 public class SQSApplication {
 
-    private static final AWSCredentials credentials;
+    private static final String STANDARD_QUEUE_NAME = "baeldung-queue";
-
+    private static final String FIFO_QUEUE_NAME = "baeldung-queue.fifo";
-    static {
+    private static final String DEAD_LETTER_QUEUE_NAME = "baeldung-dead-letter-queue";
-        // put your accesskey and secretkey here
-        credentials = new BasicAWSCredentials(
-            "<AWS accesskey>", 
-            "<AWS secretkey>"
-        );
-    }
 
     public static void main(String[] args) {
 
         // Set up the client
-        AmazonSQS sqs = AmazonSQSClientBuilder.standard()
+        SqsClient sqsClient = SqsClient.builder()
-            .withCredentials(new AWSStaticCredentialsProvider(credentials))
+            .region(Region.US_EAST_1)
-            .withRegion(Regions.US_EAST_1)
+            .credentialsProvider(ProfileCredentialsProvider.create())
             .build();
 
         // Create a standard queue
+        CreateQueueRequest createStandardQueueRequest = CreateQueueRequest.builder()
+            .queueName(STANDARD_QUEUE_NAME)
+            .build();
 
-        CreateQueueRequest createStandardQueueRequest = new CreateQueueRequest("baeldung-queue");
+        sqsClient.createQueue(createStandardQueueRequest);
-        String standardQueueUrl = sqs.createQueue(createStandardQueueRequest)
+
-            .getQueueUrl();
+        System.out.println("\nGet queue url");
+
+        GetQueueUrlResponse getQueueUrlResponse = sqsClient.getQueueUrl(GetQueueUrlRequest.builder()
+            .queueName(STANDARD_QUEUE_NAME)
+            .build());
+        String standardQueueUrl = getQueueUrlResponse.queueUrl();
 
         System.out.println(standardQueueUrl);
 
         // Create a fifo queue
+        Map<QueueAttributeName, String> queueAttributes = new HashMap<>();
+        queueAttributes.put(QueueAttributeName.FIFO_QUEUE, "true");
+        queueAttributes.put(QueueAttributeName.CONTENT_BASED_DEDUPLICATION, "true");
 
-        Map<String, String> queueAttributes = new HashMap<String, String>();
+        CreateQueueRequest createFifoQueueRequest = CreateQueueRequest.builder()
-        queueAttributes.put("FifoQueue", "true");
+            .queueName(FIFO_QUEUE_NAME)
-        queueAttributes.put("ContentBasedDeduplication", "true");
+            .attributes(queueAttributes)
+            .build();
 
-        CreateQueueRequest createFifoQueueRequest = new CreateQueueRequest("baeldung-queue.fifo").withAttributes(queueAttributes);
+        sqsClient.createQueue(createFifoQueueRequest);
-        String fifoQueueUrl = sqs.createQueue(createFifoQueueRequest)
+
-            .getQueueUrl();
+        GetQueueUrlResponse getFifoQueueUrlResponse = sqsClient.getQueueUrl(GetQueueUrlRequest.builder()
+            .queueName(FIFO_QUEUE_NAME)
+            .build());
+
+        String fifoQueueUrl = getFifoQueueUrlResponse.queueUrl();
 
         System.out.println(fifoQueueUrl);
 
         // Set up a dead letter queue
+        CreateQueueRequest createDeadLetterQueueRequest = CreateQueueRequest.builder()
+            .queueName(DEAD_LETTER_QUEUE_NAME)
+            .build();
 
-        String deadLetterQueueUrl = sqs.createQueue("baeldung-dead-letter-queue")
+        String deadLetterQueueUrl = sqsClient.createQueue(createDeadLetterQueueRequest)
-            .getQueueUrl();
+            .queueUrl();
 
-        GetQueueAttributesResult deadLetterQueueAttributes = sqs.getQueueAttributes(new GetQueueAttributesRequest(deadLetterQueueUrl).withAttributeNames("QueueArn"));
+        GetQueueAttributesRequest getQueueAttributesRequest = GetQueueAttributesRequest.builder()
+            .queueUrl(deadLetterQueueUrl)
+            .attributeNames(QueueAttributeName.QUEUE_ARN)
+            .build();
 
-        String deadLetterQueueARN = deadLetterQueueAttributes.getAttributes()
+        GetQueueAttributesResponse deadLetterQueueAttributes = sqsClient.getQueueAttributes(getQueueAttributesRequest);
+
+        String deadLetterQueueARN = deadLetterQueueAttributes.attributes()
             .get("QueueArn");
 
-        SetQueueAttributesRequest queueAttributesRequest = new SetQueueAttributesRequest().withQueueUrl(standardQueueUrl)
+        Map<QueueAttributeName, String> attributes = new HashMap<>();
-            .addAttributesEntry("RedrivePolicy", "{\"maxReceiveCount\":\"2\", " + "\"deadLetterTargetArn\":\"" + deadLetterQueueARN + "\"}");
+        attributes.put(QueueAttributeName.REDRIVE_POLICY, "{\"maxReceiveCount\":\"5\", \"deadLetterTargetArn\":\"" + deadLetterQueueARN + "\"}");
 
-        sqs.setQueueAttributes(queueAttributesRequest);
+        SetQueueAttributesRequest queueAttributesRequest = SetQueueAttributesRequest.builder()
+            .queueUrl(standardQueueUrl)
+            .attributes(attributes)
+            .build();
+
+        sqsClient.setQueueAttributes(queueAttributesRequest);
 
         // Send a message to a standard queue
 
         Map<String, MessageAttributeValue> messageAttributes = new HashMap<>();
+        MessageAttributeValue messageAttributeValue = MessageAttributeValue.builder()
+            .stringValue("This is an attribute")
+            .dataType("String")
+            .build();
 
-        messageAttributes.put("AttributeOne", new MessageAttributeValue().withStringValue("This is an attribute")
+        messageAttributes.put("AttributeOne", messageAttributeValue);
-            .withDataType("String"));
 
-        SendMessageRequest sendMessageStandardQueue = new SendMessageRequest().withQueueUrl(standardQueueUrl)
+        SendMessageRequest sendMessageStandardQueue = SendMessageRequest.builder()
-            .withMessageBody("A simple message.")
+            .queueUrl(standardQueueUrl)
-            .withDelaySeconds(30) // Message will arrive in the queue after 30 seconds. We can use this only in standard queues
+            .messageBody("A simple message.")
-            .withMessageAttributes(messageAttributes);
+            .delaySeconds(30) // Message will arrive in the queue after 30 seconds. We can use this only in standard queues
+            .messageAttributes(messageAttributes)
+            .build();
 
-        sqs.sendMessage(sendMessageStandardQueue);
+        sqsClient.sendMessage(sendMessageStandardQueue);
 
         // Send a message to a fifo queue
 
-        SendMessageRequest sendMessageFifoQueue = new SendMessageRequest().withQueueUrl(fifoQueueUrl)
+        SendMessageRequest sendMessageFifoQueue = SendMessageRequest.builder()
-            .withMessageBody("FIFO Queue")
+            .queueUrl(fifoQueueUrl)
-            .withMessageGroupId("baeldung-group-1")
+            .messageBody("FIFO Queue")
-            .withMessageAttributes(messageAttributes);
+            .messageGroupId("baeldung-group-1")
+            .messageAttributes(messageAttributes)
+            .build();
 
-        sqs.sendMessage(sendMessageFifoQueue);
+        sqsClient.sendMessage(sendMessageFifoQueue);
 
         // Send multiple messages
 
         List<SendMessageBatchRequestEntry> messageEntries = new ArrayList<>();
-        messageEntries.add(new SendMessageBatchRequestEntry().withId("id-1")
+        SendMessageBatchRequestEntry messageBatchRequestEntry1 = SendMessageBatchRequestEntry.builder()
-            .withMessageBody("batch-1")
+            .id("id-1")
-            .withMessageGroupId("baeldung-group-1"));
+            .messageBody("batch-1")
-        messageEntries.add(new SendMessageBatchRequestEntry().withId("id-2")
+            .messageGroupId("baeldung-group-1")
-            .withMessageBody("batch-2")
+            .build();
-            .withMessageGroupId("baeldung-group-1"));
 
-        SendMessageBatchRequest sendMessageBatchRequest = new SendMessageBatchRequest(fifoQueueUrl, messageEntries);
+        SendMessageBatchRequestEntry messageBatchRequestEntry2 = SendMessageBatchRequestEntry.builder()
-        sqs.sendMessageBatch(sendMessageBatchRequest);
+            .id("id-2")
+            .messageBody("batch-2")
+            .messageGroupId("baeldung-group-1")
+            .build();
+
+        messageEntries.add(messageBatchRequestEntry1);
+        messageEntries.add(messageBatchRequestEntry2);
+
+        SendMessageBatchRequest sendMessageBatchRequest = SendMessageBatchRequest.builder()
+            .queueUrl(fifoQueueUrl)
+            .entries(messageEntries)
+            .build();
+
+        sqsClient.sendMessageBatch(sendMessageBatchRequest);
 
         // Read a message from a queue
 
-        ReceiveMessageRequest receiveMessageRequest = new ReceiveMessageRequest(fifoQueueUrl).withWaitTimeSeconds(10) // Long polling;
+        ReceiveMessageRequest receiveMessageRequest = ReceiveMessageRequest.builder()
-            .withMaxNumberOfMessages(1); // Max is 10
+            .waitTimeSeconds(10)
+            .maxNumberOfMessages(10)
+            .build();
 
-        List<Message> sqsMessages = sqs.receiveMessage(receiveMessageRequest)
+        List<Message> sqsMessages = sqsClient.receiveMessage(receiveMessageRequest)
-            .getMessages();
+            .messages();
 
         sqsMessages.get(0)
-            .getAttributes();
+            .attributes();
         sqsMessages.get(0)
-            .getBody();
+            .body();
 
         // Delete a message from a queue
+        DeleteMessageRequest deleteMessageRequest = DeleteMessageRequest.builder()
+            .queueUrl(fifoQueueUrl)
+            .receiptHandle(sqsMessages.get(0)
+                .receiptHandle())
+            .build();
 
-        sqs.deleteMessage(new DeleteMessageRequest().withQueueUrl(fifoQueueUrl)
+        sqsClient.deleteMessage(deleteMessageRequest);
-            .withReceiptHandle(sqsMessages.get(0)
-                .getReceiptHandle()));
 
         // Monitoring
-        GetQueueAttributesRequest getQueueAttributesRequest = new GetQueueAttributesRequest(standardQueueUrl).withAttributeNames("All");
+        GetQueueAttributesRequest getQueueAttributesRequestForMonitoring = GetQueueAttributesRequest.builder()
-        GetQueueAttributesResult getQueueAttributesResult = sqs.getQueueAttributes(getQueueAttributesRequest);
+            .queueUrl(standardQueueUrl)
-        System.out.println(String.format("The number of messages on the queue: %s", getQueueAttributesResult.getAttributes()
+            .build();
+
+        GetQueueAttributesResponse attributesResponse = sqsClient.getQueueAttributes(getQueueAttributesRequestForMonitoring);
+        System.out.println(String.format("The number of messages on the queue: %s", attributesResponse.attributes()
             .get("ApproximateNumberOfMessages")));
-        System.out.println(String.format("The number of messages in flight: %s", getQueueAttributesResult.getAttributes()
+        System.out.println(String.format("The number of messages in flight: %s", attributesResponse.attributes()
             .get("ApproximateNumberOfMessagesNotVisible")));
 
     }

aws-modules/aws-reactive/pom.xml

@@ -63,6 +63,7 @@
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-test</artifactId>
+            <version>${reactor.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -94,6 +95,7 @@
         <spring.version>2.2.1.RELEASE</spring.version>
         <awssdk.version>2.17.283</awssdk.version>
         <lombok.version>1.18.20</lombok.version>
+        <reactor.version>3.6.0</reactor.version>
     </properties>
 
 </project>

aws-modules/aws-s3-update-object/pom.xml

@@ -1,43 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <artifactId>aws-s3-update-object</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>aws-s3-update-object</name>
-    <description>Project demonstrating overwriting of S3 objects</description>
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-boot-2</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-boot-2</relativePath>
-    </parent>
-    <dependencies>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>com.amazonaws</groupId>
-            <artifactId>aws-java-sdk</artifactId>
-            <version>${aws-java-sdk-version}</version>
-        </dependency>
-    </dependencies>
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-            </plugin>
-        </plugins>
-    </build>
-    <properties>
-        <aws-java-sdk-version>1.12.523</aws-java-sdk-version>
-    </properties>
-</project>

aws-modules/aws-s3-update-object/src/main/java/com/baeldung/awss3updateobject/AwsS3UpdateObjectApplication.java

@@ -1,13 +0,0 @@
-package com.baeldung.awss3updateobject;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-@SpringBootApplication
-public class AwsS3UpdateObjectApplication {
-
-	public static void main(String[] args) {
-		SpringApplication.run(AwsS3UpdateObjectApplication.class, args);
-	}
-
-}

aws-modules/aws-s3-update-object/src/main/java/com/baeldung/awss3updateobject/controller/FileController.java

@@ -1,24 +0,0 @@
-package com.baeldung.awss3updateobject.controller;
-
-import com.baeldung.awss3updateobject.service.FileService;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.web.bind.annotation.*;
-import org.springframework.web.multipart.MultipartFile;
-
-@RestController
-@RequestMapping("api/v1/file")
-public class FileController {
-
-    @Autowired
-    FileService fileService;
-
-    @PostMapping("/upload")
-    public String uploadFile(@RequestParam("file") MultipartFile multipartFile) throws Exception {
-        return this.fileService.uploadFile(multipartFile);
-    }
-
-    @PostMapping("/update")
-    public String updateFile(@RequestParam("file") MultipartFile multipartFile, @RequestParam("filePath")  String exitingFilePath) throws Exception {
-        return this.fileService.updateFile(multipartFile, exitingFilePath);
-    }
-}

aws-modules/aws-s3-update-object/src/main/java/com/baeldung/awss3updateobject/service/FileService.java

@@ -1,80 +0,0 @@
-package com.baeldung.awss3updateobject.service;
-
-import com.amazonaws.auth.AWSCredentials;
-import com.amazonaws.auth.AWSStaticCredentialsProvider;
-import com.amazonaws.auth.BasicAWSCredentials;
-import com.amazonaws.regions.Regions;
-import com.amazonaws.services.s3.AmazonS3;
-import com.amazonaws.services.s3.AmazonS3ClientBuilder;
-import com.amazonaws.services.s3.model.*;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.stereotype.Service;
-import org.springframework.web.multipart.MultipartFile;
-
-import javax.annotation.PostConstruct;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.HashMap;
-import java.util.Map;
-
-@Service
-public class FileService {
-
-    private static final Logger logger = LoggerFactory.getLogger(FileService.class);
-
-    public AmazonS3 amazonS3;
-
-    @Value("${aws.s3bucket}")
-    public String awsS3Bucket;
-
-    @PostConstruct
-    private void init(){
-        AWSCredentials credentials = new BasicAWSCredentials(
-                "AWS AccessKey",
-                "AWS secretKey"
-        );
-        this.amazonS3 = AmazonS3ClientBuilder.standard()
-                .withRegion(Regions.fromName("us-east-1"))
-                .withCredentials(new AWSStaticCredentialsProvider(credentials))
-                .build();
-    }
-
-    public String uploadFile(MultipartFile multipartFile) throws Exception {
-        String key = "/documents/" + multipartFile.getOriginalFilename();
-        return this.uploadDocument(this.awsS3Bucket, key, multipartFile);
-    }
-
-    public String updateFile(MultipartFile multipartFile, String key) throws Exception {
-        return this.uploadDocument(this.awsS3Bucket, key, multipartFile);
-    }
-
-    private String uploadDocument(String s3bucket, String key, MultipartFile multipartFile) throws Exception {
-        try {
-            ObjectMetadata metadata = new ObjectMetadata();
-            metadata.setContentType(multipartFile.getContentType());
-            Map<String, String> attributes = new HashMap<>();
-            attributes.put("document-content-size", String.valueOf(multipartFile.getSize()));
-            metadata.setUserMetadata(attributes);
-            InputStream documentStream = multipartFile.getInputStream();
-            PutObjectResult putObjectResult = this.amazonS3.putObject(new PutObjectRequest(s3bucket, key, documentStream, metadata));
-
-            S3Object s3Object = this.amazonS3.getObject(s3bucket, key);
-            logger.info("Last Modified: " + s3Object.getObjectMetadata().getLastModified());
-            return key;
-        } catch (AmazonS3Exception ex) {
-            if (ex.getErrorCode().equalsIgnoreCase("NoSuchBucket")) {
-                String msg = String.format("No bucket found with name %s", s3bucket);
-                throw new Exception(msg);
-            } else if (ex.getErrorCode().equalsIgnoreCase("AccessDenied")) {
-                String msg = String.format("Access denied to S3 bucket %s", s3bucket);
-                throw new Exception(msg);
-            }
-            throw ex;
-        } catch (IOException ex) {
-            String msg = String.format("Error saving file %s to AWS S3 bucket %s", key, s3bucket);
-            throw new Exception(msg);
-        }
-    }
-}

aws-modules/aws-s3-update-object/src/main/resources/application.properties

@@ -1 +0,0 @@
-aws.s3bucket=baeldung-documents;

aws-modules/aws-s3-update-object/src/test/java/com/baeldung/awss3updateobject/controller/FileControllerUnitTest.java

@@ -1,62 +0,0 @@
-package com.baeldung.awss3updateobject.controller;
-
-import com.baeldung.awss3updateobject.service.FileService;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.mockito.InjectMocks;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-import org.springframework.mock.web.MockMultipartFile;
-import org.springframework.test.web.servlet.MockMvc;
-import org.springframework.test.web.servlet.setup.MockMvcBuilders;
-import org.springframework.web.multipart.MultipartFile;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.mockito.Mockito.*;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
-
-public class FileControllerUnitTest {
-
-    private MockMvc mockMvc;
-
-    @Mock
-    private FileService fileService;
-
-    @InjectMocks
-    private FileController fileController;
-
-    @BeforeEach
-    public void setUp() {
-        MockitoAnnotations.openMocks(this);
-        this.mockMvc = MockMvcBuilders.standaloneSetup(fileController).build();
-    }
-
-    @Test
-    public void givenValidMultipartFile_whenUploadedViaEndpoint_thenCorrectPathIsReturned() throws Exception {
-        MockMultipartFile multipartFile = new MockMultipartFile("file", "test.txt", "text/plain", "sample file content".getBytes());
-        String expectedResult = "File Uploaded Successfully";
-
-        when(fileService.uploadFile(multipartFile)).thenReturn(expectedResult);
-
-        mockMvc.perform(multipart("/api/v1/file/upload").file(multipartFile))
-                .andExpect(status().isOk())
-                .andExpect(content().string(expectedResult));
-    }
-
-    @Test
-    public void givenValidMultipartFileAndExistingPath_whenUpdatedViaEndpoint_thenSamePathIsReturned() throws Exception {
-        MockMultipartFile multipartFile = new MockMultipartFile("file", "test.txt", "text/plain", "updated file content".getBytes());
-        String filePath = "some/path/to/file";
-        String expectedResult = "File Updated Successfully";
-
-        when(fileService.updateFile(multipartFile, filePath)).thenReturn(expectedResult);
-
-        mockMvc.perform(multipart("/api/v1/file/update")
-                        .file(multipartFile)
-                        .param("filePath", filePath))
-                .andExpect(status().isOk())
-                .andExpect(content().string(expectedResult));
-    }
-}

aws-modules/aws-s3-update-object/src/test/java/com/baeldung/awss3updateobject/service/FileServiceUnitTest.java

@@ -1,99 +0,0 @@
-package com.baeldung.awss3updateobject.service;
-
-import com.amazonaws.services.s3.AmazonS3;
-import com.amazonaws.services.s3.model.AmazonS3Exception;
-import com.amazonaws.services.s3.model.PutObjectRequest;
-import com.amazonaws.services.s3.model.S3Object;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.mockito.InjectMocks;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-import org.springframework.web.multipart.MultipartFile;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.*;
-
-public class FileServiceUnitTest {
-
-    @Mock
-    private AmazonS3 amazonS3;
-
-    @Mock
-    private MultipartFile multipartFile;
-
-    @InjectMocks
-    private FileService fileService;
-
-    @BeforeEach
-    public void setup() {
-        MockitoAnnotations.openMocks(this);
-        fileService = new FileService();
-        fileService.awsS3Bucket = "test-bucket";
-        fileService.amazonS3 = amazonS3;
-      }
-
-    @Test
-    public void givenValidFile_whenUploaded_thenKeyMatchesDocumentPath() throws Exception {
-        when(multipartFile.getName()).thenReturn("testFile");
-        when(multipartFile.getOriginalFilename()).thenReturn("testFile");
-        when(multipartFile.getContentType()).thenReturn("application/pdf");
-        when(multipartFile.getSize()).thenReturn(1024L);
-        when(multipartFile.getInputStream()).thenReturn(mock(InputStream.class));
-
-        S3Object s3Object = new S3Object();
-        when(amazonS3.putObject(any())).thenReturn(null);
-        when(amazonS3.getObject(anyString(), anyString())).thenReturn(s3Object);
-
-        String key = fileService.uploadFile(multipartFile);
-
-        assertEquals("/documents/testFile", key);
-    }
-
-    @Test
-    public void givenValidFile_whenUploadFailsDueToNoBucket_thenExceptionIsThrown() throws Exception {
-        when(multipartFile.getName()).thenReturn("testFile");
-        when(multipartFile.getOriginalFilename()).thenReturn("testFile");
-        when(multipartFile.getContentType()).thenReturn("application/pdf");
-        when(multipartFile.getSize()).thenReturn(1024L);
-        when(multipartFile.getInputStream()).thenReturn(mock(InputStream.class));
-
-        AmazonS3Exception exception = new AmazonS3Exception("Test exception");
-        exception.setErrorCode("NoSuchBucket");
-        when(amazonS3.putObject(any(PutObjectRequest.class))).thenThrow(exception);
-
-        assertThrows(Exception.class, () -> fileService.uploadFile(multipartFile));
-    }
-
-    @Test
-    public void givenExistingFile_whenUpdated_thenSameKeyIsReturned() throws Exception {
-        when(multipartFile.getName()).thenReturn("testFile");
-        when(multipartFile.getContentType()).thenReturn("application/pdf");
-        when(multipartFile.getSize()).thenReturn(1024L);
-        when(multipartFile.getInputStream()).thenReturn(mock(InputStream.class));
-
-        S3Object s3Object = new S3Object();
-        when(amazonS3.putObject(any(PutObjectRequest.class))).thenReturn(null);
-        when(amazonS3.getObject(anyString(), anyString())).thenReturn(s3Object);
-
-        String key = "/documents/existingFile";
-        String resultKey = fileService.updateFile(multipartFile, key);
-
-        assertEquals(key, resultKey);
-    }
-
-    @Test
-    public void givenFileWithIOException_whenUpdated_thenExceptionIsThrown() throws Exception {
-        when(multipartFile.getName()).thenReturn("testFile");
-        when(multipartFile.getContentType()).thenReturn("application/pdf");
-        when(multipartFile.getSize()).thenReturn(1024L);
-        when(multipartFile.getInputStream()).thenThrow(new IOException("Test IO Exception"));
-
-        assertThrows(Exception.class, () -> fileService.updateFile(multipartFile, "/documents/existingFile"));
-    }
-}

aws-modules/aws-s3/README.md

@@ -11,3 +11,4 @@ This module contains articles about Simple Storage Service (S3) on AWS
 - [Listing All AWS S3 Objects in a Bucket Using Java](https://www.baeldung.com/java-aws-s3-list-bucket-objects)
 - [Update an Existing Amazon S3 Object Using Java](https://www.baeldung.com/java-update-amazon-s3-object)
 - [How To Rename Files and Folders in Amazon S3](https://www.baeldung.com/java-amazon-s3-rename-files-folders)
+- [Update an Existing Amazon S3 Object Using Java](https://www.baeldung.com/java-update-amazon-s3-object)

aws-modules/aws-s3/pom.xml

@@ -39,27 +39,6 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <version>${maven-shade-plugin.version}</version>
-                <configuration>
-                    <createDependencyReducedPom>false</createDependencyReducedPom>
-                </configuration>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-
     <properties>
         <aws.java.sdk.version>2.20.52</aws.java.sdk.version>
         <commons-codec-version>1.10.L001</commons-codec-version>

aws-modules/aws-s3/src/main/java/com/baeldung/s3/S3Application.java

@@ -45,6 +45,13 @@ public class S3Application {
             new File("/Users/user/Document/hello.txt")
         );
 
+        s3Service.updateObject(
+            AWS_BUCKET,
+            "Document/hello2.txt",
+            new File("/Users/user/Document/hello2.txt")
+        );
+
+
         //listing objects
         s3Service.listObjects(AWS_BUCKET);
 

aws-modules/aws-s3/src/main/java/com/baeldung/s3/S3Service.java

@@ -24,6 +24,7 @@ import software.amazon.awssdk.services.s3.model.GetObjectRequest;
 import software.amazon.awssdk.services.s3.model.GetObjectResponse;
 import software.amazon.awssdk.services.s3.model.HeadBucketRequest;
 import software.amazon.awssdk.services.s3.model.HeadObjectRequest;
+import software.amazon.awssdk.services.s3.model.HeadObjectResponse;
 import software.amazon.awssdk.services.s3.model.ListBucketsResponse;
 import software.amazon.awssdk.services.s3.model.ListObjectsV2Request;
 import software.amazon.awssdk.services.s3.model.ListObjectsV2Response;
@@ -99,9 +100,15 @@ class S3Service {
             .key(key)
             .build();
 
+
         return s3Client.putObject(request, Path.of(file.toURI()));
     }
 
+    //updating object
+    public PutObjectResponse updateObject(String bucketName, String key, java.io.File file) {
+        return this.putObject(bucketName, key, file);
+    }
+
     //listing objects
     public void listObjects(String bucketName) {
         ListObjectsV2Request listObjectsV2Request = ListObjectsV2Request.builder()
@@ -110,6 +117,7 @@ class S3Service {
         ListObjectsV2Response listObjectsV2Response = s3Client.listObjectsV2(listObjectsV2Request);
 
         for(S3Object os : listObjectsV2Response.contents()) {
+
             System.out.println(os.key());
         }
     }

aws-modules/aws-s3/src/test/java/com/baeldung/s3/S3ServiceIntegrationTest.java

@@ -11,6 +11,8 @@ import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 
+import java.io.File;
+import java.nio.file.Path;
 import java.util.Collections;
 
 import software.amazon.awssdk.services.s3.S3Client;
@@ -23,6 +25,7 @@ import software.amazon.awssdk.services.s3.model.HeadBucketRequest;
 import software.amazon.awssdk.services.s3.model.ListBucketsResponse;
 import software.amazon.awssdk.services.s3.model.ListObjectsV2Request;
 import software.amazon.awssdk.services.s3.model.ListObjectsV2Response;
+import software.amazon.awssdk.services.s3.model.PutObjectRequest;
 
 class S3ServiceIntegrationTest {
 
@@ -38,6 +41,8 @@ class S3ServiceIntegrationTest {
 
     private final String AWS_BUCKET = "baeldung-tutorial-s3";
 
+    private File file = new File("/Users/user/Document/hello2.txt");
+
     @BeforeEach
     public void setup() {
         MockitoAnnotations.openMocks(this);
@@ -75,6 +80,17 @@ class S3ServiceIntegrationTest {
         verify(s3Client).createBucket(bucketRequest);
     }
 
+    @Test
+    void whenVerifyingUploadOfS3Object_thenCorrect() {
+        PutObjectRequest request = PutObjectRequest.builder()
+            .bucket(BUCKET_NAME)
+            .key(KEY_NAME)
+            .build();
+
+        s3Service.putObject(BUCKET_NAME, KEY_NAME, file);
+        verify(s3Client).putObject(request, Path.of(file.toURI()) );
+    }
+
     @Test
     void whenVerifyingListBuckets_thenCorrect() {
         when(s3Client.listBuckets()).thenReturn(ListBucketsResponse.builder().buckets(Collections.emptyList()).build());

aws-modules/pom.xml

@@ -5,7 +5,6 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>aws-modules</artifactId>
     <name>aws-modules</name>
-    <packaging>pom</packaging>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -13,17 +12,28 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.amazonaws</groupId>
+            <artifactId>aws-java-sdk-dynamodb</artifactId>
+            <version>1.12.523</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+    <packaging>pom</packaging>
+
     <modules>
         <module>aws-app-sync</module>
+        <module>aws-dynamodb</module>
         <module>aws-lambda-modules</module>
         <module>aws-miscellaneous</module>
         <module>aws-reactive</module>
         <module>aws-s3</module>
-        <module>aws-s3-update-object</module>
     </modules>
 
     <properties>
         <aws-java-sdk.version>1.12.331</aws-java-sdk.version>
+        <aws-java-sdk-v2.version>2.20.147</aws-java-sdk-v2.version>
         <maven-shade-plugin.version>3.0.0</maven-shade-plugin.version>
     </properties>
 

core-groovy-modules/core-groovy-2/gmavenplus-pom.xml

@@ -167,7 +167,6 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <commons-lang3.version>3.9</commons-lang3.version>
-        <java.version>1.8</java.version>
         <logback.version>1.2.3</logback.version>
     </properties>
 </project>

core-groovy-modules/core-groovy-2/pom.xml

@@ -13,6 +13,13 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
+    <pluginRepositories>
+        <pluginRepository>
+            <id>groovy-plugins-release</id>
+            <url>https://groovy.jfrog.io/artifactory/plugins-release-local</url>
+        </pluginRepository>
+    </pluginRepositories>
+
     <dependencies>
         <dependency>
             <groupId>org.apache.commons</groupId>
@@ -156,8 +163,8 @@
         <groovy-wslite.version>1.1.3</groovy-wslite.version>
         <assembly.plugin.version>3.4.2</assembly.plugin.version>
         <compiler.plugin.version>3.8.1</compiler.plugin.version>
-        <groovy.compiler.version>3.7.0</groovy.compiler.version>
+        <groovy.compiler.version>3.9.0</groovy.compiler.version>
-        <groovy-eclipse-batch.version>3.0.8-01</groovy-eclipse-batch.version>
+        <groovy-eclipse-batch.version>3.0.9-03</groovy-eclipse-batch.version>
     </properties>
 
 </project>

core-java-modules/core-java-11-2/README.md

@@ -5,7 +5,6 @@ This module contains articles about Java 11 core features
 ### Relevant articles
 - [Guide To Java 8 Optional](https://www.baeldung.com/java-optional)
 - [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
-- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
 - [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
 - [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
 - [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)

core-java-modules/core-java-11-2/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java

@@ -1,237 +0,0 @@
-package com.baeldung.collectors;
-
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Sets;
-import org.junit.Test;
-
-import java.util.*;
-import java.util.function.BiConsumer;
-import java.util.function.BinaryOperator;
-import java.util.function.Function;
-import java.util.function.Supplier;
-import java.util.stream.Collector;
-
-import static com.google.common.collect.Sets.newHashSet;
-import static java.util.stream.Collectors.*;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
-
-public class Java8CollectorsUnitTest {
-
-    private final List<String> givenList = Arrays.asList("a", "bb", "ccc", "dd");
-    private final List<String> listWithDuplicates = Arrays.asList("a", "bb", "c", "d", "bb");
-
-    @Test
-    public void whenCollectingToList_shouldCollectToList() throws Exception {
-        final List<String> result = givenList.stream().collect(toList());
-
-        assertThat(result).containsAll(givenList);
-    }
-
-    @Test
-    public void whenCollectingToUnmodifiableList_shouldCollectToUnmodifiableList() {
-        final List<String> result = givenList.stream().collect(toUnmodifiableList());
-
-        assertThatThrownBy(() -> result.add("foo"))
-          .isInstanceOf(UnsupportedOperationException.class);
-    }
-
-    @Test
-    public void whenCollectingToSet_shouldCollectToSet() throws Exception {
-        final Set<String> result = givenList.stream().collect(toSet());
-
-        assertThat(result).containsAll(givenList);
-    }
-
-    @Test
-    public void whenCollectingToUnmodifiableSet_shouldCollectToUnmodifiableSet() {
-        final Set<String> result = givenList.stream().collect(toUnmodifiableSet());
-
-        assertThatThrownBy(() -> result.add("foo"))
-          .isInstanceOf(UnsupportedOperationException.class);
-    }
-
-    @Test
-    public void givenContainsDuplicateElements_whenCollectingToSet_shouldAddDuplicateElementsOnlyOnce() throws Exception {
-        final Set<String> result = listWithDuplicates.stream().collect(toSet());
-
-        assertThat(result).hasSize(4);
-    }
-
-    @Test
-    public void whenCollectingToCollection_shouldCollectToCollection() throws Exception {
-        final List<String> result = givenList.stream().collect(toCollection(LinkedList::new));
-
-        assertThat(result).containsAll(givenList).isInstanceOf(LinkedList.class);
-    }
-
-    @Test
-    public void whenCollectingToImmutableCollection_shouldThrowException() throws Exception {
-        assertThatThrownBy(() -> {
-            givenList.stream().collect(toCollection(ImmutableList::of));
-        }).isInstanceOf(UnsupportedOperationException.class);
-
-    }
-
-    @Test
-    public void whenCollectingToMap_shouldCollectToMap() throws Exception {
-        final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length));
-
-        assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
-    }
-
-    @Test
-    public void whenCollectingToUnmodifiableMap_shouldCollectToUnmodifiableMap() {
-        final Map<String, Integer> result = givenList.stream()
-          .collect(toUnmodifiableMap(Function.identity(), String::length));
-
-        assertThatThrownBy(() -> result.put("foo", 3))
-                .isInstanceOf(UnsupportedOperationException.class);
-    }
-
-    @Test
-    public void whenCollectingToMapwWithDuplicates_shouldCollectToMapMergingTheIdenticalItems() throws Exception {
-        final Map<String, Integer> result = listWithDuplicates.stream().collect(
-          toMap(
-            Function.identity(),
-            String::length,
-            (item, identicalItem) -> item
-          )
-        );
-
-        assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("c", 1).containsEntry("d", 1);
-    }
-
-    @Test
-    public void givenContainsDuplicateElements_whenCollectingToMap_shouldThrowException() throws Exception {
-        assertThatThrownBy(() -> {
-            listWithDuplicates.stream().collect(toMap(Function.identity(), String::length));
-        }).isInstanceOf(IllegalStateException.class);
-    }
-
-    @Test
-    public void whenCollectingAndThen_shouldCollect() throws Exception {
-        final List<String> result = givenList.stream().collect(collectingAndThen(toList(), ImmutableList::copyOf));
-
-        assertThat(result).containsAll(givenList).isInstanceOf(ImmutableList.class);
-    }
-
-    @Test
-    public void whenJoining_shouldJoin() throws Exception {
-        final String result = givenList.stream().collect(joining());
-
-        assertThat(result).isEqualTo("abbcccdd");
-    }
-
-    @Test
-    public void whenJoiningWithSeparator_shouldJoinWithSeparator() throws Exception {
-        final String result = givenList.stream().collect(joining(" "));
-
-        assertThat(result).isEqualTo("a bb ccc dd");
-    }
-
-    @Test
-    public void whenJoiningWithSeparatorAndPrefixAndPostfix_shouldJoinWithSeparatorPrePost() throws Exception {
-        final String result = givenList.stream().collect(joining(" ", "PRE-", "-POST"));
-
-        assertThat(result).isEqualTo("PRE-a bb ccc dd-POST");
-    }
-
-    @Test
-    public void whenPartitioningBy_shouldPartition() throws Exception {
-        final Map<Boolean, List<String>> result = givenList.stream().collect(partitioningBy(s -> s.length() > 2));
-
-        assertThat(result).containsKeys(true, false).satisfies(booleanListMap -> {
-            assertThat(booleanListMap.get(true)).contains("ccc");
-
-            assertThat(booleanListMap.get(false)).contains("a", "bb", "dd");
-        });
-    }
-
-    @Test
-    public void whenCounting_shouldCount() throws Exception {
-        final Long result = givenList.stream().collect(counting());
-
-        assertThat(result).isEqualTo(4);
-    }
-
-    @Test
-    public void whenSummarizing_shouldSummarize() throws Exception {
-        final DoubleSummaryStatistics result = givenList.stream().collect(summarizingDouble(String::length));
-
-        assertThat(result.getAverage()).isEqualTo(2);
-        assertThat(result.getCount()).isEqualTo(4);
-        assertThat(result.getMax()).isEqualTo(3);
-        assertThat(result.getMin()).isEqualTo(1);
-        assertThat(result.getSum()).isEqualTo(8);
-    }
-
-    @Test
-    public void whenAveraging_shouldAverage() throws Exception {
-        final Double result = givenList.stream().collect(averagingDouble(String::length));
-
-        assertThat(result).isEqualTo(2);
-    }
-
-    @Test
-    public void whenSumming_shouldSum() throws Exception {
-        final Double result = givenList.stream().filter(i -> true).collect(summingDouble(String::length));
-
-        assertThat(result).isEqualTo(8);
-    }
-
-    @Test
-    public void whenMaxingBy_shouldMaxBy() throws Exception {
-        final Optional<String> result = givenList.stream().collect(maxBy(Comparator.naturalOrder()));
-
-        assertThat(result).isPresent().hasValue("dd");
-    }
-
-    @Test
-    public void whenGroupingBy_shouldGroupBy() throws Exception {
-        final Map<Integer, Set<String>> result = givenList.stream().collect(groupingBy(String::length, toSet()));
-
-        assertThat(result).containsEntry(1, newHashSet("a")).containsEntry(2, newHashSet("bb", "dd")).containsEntry(3, newHashSet("ccc"));
-    }
-
-    @Test
-    public void whenCreatingCustomCollector_shouldCollect() throws Exception {
-        final ImmutableSet<String> result = givenList.stream().collect(toImmutableSet());
-
-        assertThat(result).isInstanceOf(ImmutableSet.class).contains("a", "bb", "ccc", "dd");
-
-    }
-
-    private static <T> ImmutableSetCollector<T> toImmutableSet() {
-        return new ImmutableSetCollector<>();
-    }
-
-    private static class ImmutableSetCollector<T> implements Collector<T, ImmutableSet.Builder<T>, ImmutableSet<T>> {
-
-        @Override
-        public Supplier<ImmutableSet.Builder<T>> supplier() {
-            return ImmutableSet::builder;
-        }
-
-        @Override
-        public BiConsumer<ImmutableSet.Builder<T>, T> accumulator() {
-            return ImmutableSet.Builder::add;
-        }
-
-        @Override
-        public BinaryOperator<ImmutableSet.Builder<T>> combiner() {
-            return (left, right) -> left.addAll(right.build());
-        }
-
-        @Override
-        public Function<ImmutableSet.Builder<T>, ImmutableSet<T>> finisher() {
-            return ImmutableSet.Builder::build;
-        }
-
-        @Override
-        public Set<Characteristics> characteristics() {
-            return Sets.immutableEnumSet(Characteristics.UNORDERED);
-        }
-    }
-}

core-java-modules/core-java-11-3/pom.xml

@@ -45,7 +45,7 @@
     <properties>
         <maven.compiler.source.version>11</maven.compiler.source.version>
         <maven.compiler.target.version>11</maven.compiler.target.version>
-        <jackson.version>2.14.1</jackson.version>
+        <jackson.version>2.16.0</jackson.version>
         <gson.version>2.10</gson.version>
     </properties>
 

core-java-modules/core-java-12/pom.xml

@@ -8,9 +8,9 @@
     <packaging>jar</packaging>
 
     <parent>
-        <groupId>com.baeldung</groupId>
+        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>core-java-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
     </parent>
 
     <dependencies>
@@ -21,30 +21,4 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${maven.compiler.source.version}</source>
-                    <target>${maven.compiler.target.version}</target>
-                    <compilerArgs>--enable-preview</compilerArgs>
-                </configuration>
-            </plugin>
-            <plugin>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <configuration>
-                    <argLine>--enable-preview</argLine>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <properties>
-        <maven.compiler.source.version>12</maven.compiler.source.version>
-        <maven.compiler.target.version>12</maven.compiler.target.version>
-    </properties>
-
 </project>

core-java-modules/core-java-12/src/test/java/com/baeldung/switchExpression/SwitchUnitTest.java

@@ -19,19 +19,6 @@ public class SwitchUnitTest {
         Assert.assertEquals(value, 2);
     }
 
-    @Test
-    public void switchLocalVariable(){
-        var month = Month.AUG;
-        int i = switch (month){
-            case JAN,JUN, JUL -> 3;
-            case FEB,SEP, OCT, NOV, DEC -> 1;
-            case MAR,MAY, APR, AUG -> {
-                int j = month.toString().length() * 4;
-                break j;
-            }
-        };
-        Assert.assertEquals(12, i);
-    }
 
     enum Month {JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC}
 }

core-java-modules/core-java-13/pom.xml

@@ -8,39 +8,9 @@
     <packaging>jar</packaging>
 
     <parent>
-        <groupId>com.baeldung</groupId>
+        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>core-java-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
     </parent>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${maven.compiler.source.version}</source>
-                    <target>${maven.compiler.target.version}</target>
-                    <release>13</release>
-                    <compilerArgs>--enable-preview</compilerArgs>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>${surefire.plugin.version}</version>
-                <configuration>
-                    <argLine>--enable-preview</argLine>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <properties>
-        <maven.compiler.source.version>13</maven.compiler.source.version>
-        <maven.compiler.target.version>13</maven.compiler.target.version>
-        <surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
-    </properties>
-
 </project>

core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java

@@ -7,7 +7,6 @@ import org.junit.Test;
 public class SwitchExpressionsWithYieldUnitTest {
 
     @Test
-    @SuppressWarnings("preview")
     public void whenSwitchingOnOperationSquareMe_thenWillReturnSquare() {
         var me = 4;
         var operation = "squareMe";

core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java

@@ -8,7 +8,6 @@ public class TextBlocksUnitTest {
 
     private static final String JSON_STRING = "{\r\n" + "\"name\" : \"Baeldung\",\r\n" + "\"website\" : \"https://www.%s.com/\"\r\n" + "}";
 
-    @SuppressWarnings("preview")
     private static final String TEXT_BLOCK_JSON = """
             {
             "name" : "Baeldung",
@@ -25,7 +24,6 @@ public class TextBlocksUnitTest {
 
     }
 
-    @SuppressWarnings("removal")
     @Test
     public void whenTextBlocks_thenFormattedWorksAsFormat() {
         assertThat(TEXT_BLOCK_JSON.formatted("baeldung")

core-java-modules/core-java-13/src/test/java/com/baeldung/switchExpression/SwitchExpressionsUnitTest.java

@@ -13,7 +13,6 @@ import org.junit.Test;
 public class SwitchExpressionsUnitTest {
 
   @Test
-  @SuppressWarnings ("preview")
   public void whenSwitchingOverMonthJune_thenWillReturn3() {
 
     var month = JUNE;
@@ -29,7 +28,6 @@ public class SwitchExpressionsUnitTest {
   }
 
   @Test
-  @SuppressWarnings ("preview")
   public void whenSwitchingOverMonthAugust_thenWillReturn24() {
     var month = AUGUST;
 
@@ -47,7 +45,6 @@ public class SwitchExpressionsUnitTest {
   }
 
   @Test
-  @SuppressWarnings ("preview")
   public void whenSwitchingOverMonthJanuary_thenWillReturn3() {
 
     Function<Month, Integer> func = (month) -> {
@@ -61,7 +58,6 @@ public class SwitchExpressionsUnitTest {
   }
 
   @Test
-  @SuppressWarnings ("preview")
   public void whenSwitchingOverMonthAugust_thenWillReturn2() {
     var month = AUGUST;
 

core-java-modules/core-java-15/pom.xml

@@ -8,10 +8,9 @@
     <packaging>jar</packaging>
 
     <parent>
-        <groupId>com.baeldung</groupId>
+        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>core-java-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../pom.xml</relativePath>
     </parent>
 
     <dependencies>
@@ -27,33 +26,4 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <release>${maven.compiler.release}</release>
-                    <compilerArgs>--enable-preview</compilerArgs>
-                    <source>14</source>
-                    <target>14</target>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>${surefire.plugin.version}</version>
-                <configuration>
-                    <argLine>--enable-preview</argLine>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <properties>
-        <maven.compiler.release>15</maven.compiler.release>
-        <surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
-    </properties>
-
 </project>

core-java-modules/core-java-16/README.md

@@ -4,5 +4,4 @@
 - [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
 - [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
 - [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
-- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
 - [Value-Based Classes in Java](https://www.baeldung.com/java-value-based-classes)

core-java-modules/core-java-16/src/main/java/com/baeldung/value_based_class/Point.java

@@ -30,6 +30,11 @@ public final class Point {
         return new Point(x, y, z);
     }
 
+    @Override
+    public String toString() {
+        return "Point{" + "x=" + x + ", y=" + y + ", z=" + z + '}';
+    }
+
     @Override
     public boolean equals(Object other) {
         if (other == null || getClass() != other.getClass())

core-java-modules/core-java-16/src/test/java/com/baeldung/value_based_class/ValueBasedClassUnitTest.java

@@ -1,14 +1,17 @@
 package com.baeldung.value_based_class;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.junit.Assert;
 import org.junit.Test;
 
 public class ValueBasedClassUnitTest {
     @Test
     public void givenAutoboxedAndPrimitive_whenCompared_thenReturnEquals() {
-        int primitive_a = 125;
+        List<Integer> list = new ArrayList<>();
-        Integer obj_a = 125; // this is autoboxed
+        list.add(1); // this is autoboxed
-        Assert.assertSame(primitive_a, obj_a);
+        Assert.assertEquals(list.get(0), Integer.valueOf(1));
     }
 
     @Test

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

@@ -8,3 +8,5 @@
 - [Sealed Classes and Interfaces in Java](https://www.baeldung.com/java-sealed-classes-interfaces)
 - [Migrate From Java 8 to Java 17](https://www.baeldung.com/java-migrate-8-to-17)
 - [Format Multiple ‘or’ Conditions in an If Statement in Java](https://www.baeldung.com/java-multiple-or-conditions-if-statement)
+- [Get All Record Fields and Its Values via Reflection](https://www.baeldung.com/java-reflection-record-fields-values)
+- [Context-Specific Deserialization Filters in Java 17](https://www.baeldung.com/java-context-specific-deserialization-filters)

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/ContextSpecificDeserializationFilterFactory.java

@@ -0,0 +1,47 @@
+package com.baeldung.deserializationfilters;
+
+import java.io.ObjectInputFilter;
+import java.util.function.BinaryOperator;
+
+import com.baeldung.deserializationfilters.service.DeserializationService;
+import com.baeldung.deserializationfilters.service.LimitedArrayService;
+import com.baeldung.deserializationfilters.service.LowDepthService;
+import com.baeldung.deserializationfilters.service.SmallObjectService;
+import com.baeldung.deserializationfilters.utils.FilterUtils;
+
+public class ContextSpecificDeserializationFilterFactory implements BinaryOperator<ObjectInputFilter> {
+
+    @Override
+    public ObjectInputFilter apply(ObjectInputFilter current, ObjectInputFilter next) {
+        if (current == null) {
+            Class<?> caller = findInStack(DeserializationService.class);
+
+            if (caller == null) {
+                current = FilterUtils.fallbackFilter();
+            } else if (caller.equals(SmallObjectService.class)) {
+                current = FilterUtils.safeSizeFilter(190);
+            } else if (caller.equals(LowDepthService.class)) {
+                current = FilterUtils.safeDepthFilter(2);
+            } else if (caller.equals(LimitedArrayService.class)) {
+                current = FilterUtils.safeArrayFilter(3);
+            }
+        }
+
+        return ObjectInputFilter.merge(current, next);
+    }
+
+    private static Class<?> findInStack(Class<?> superType) {
+        for (StackTraceElement element : Thread.currentThread()
+            .getStackTrace()) {
+            try {
+                Class<?> subType = Class.forName(element.getClassName());
+                if (superType.isAssignableFrom(subType)) {
+                    return subType;
+                }
+            } catch (ClassNotFoundException e) {
+                return null;
+            }
+        }
+        return null;
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/pojo/ContextSpecific.java

@@ -0,0 +1,7 @@
+package com.baeldung.deserializationfilters.pojo;
+
+import java.io.Serializable;
+
+public interface ContextSpecific extends Serializable {
+
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/pojo/NestedSample.java

@@ -0,0 +1,19 @@
+package com.baeldung.deserializationfilters.pojo;
+
+public class NestedSample implements ContextSpecific {
+    private static final long serialVersionUID = 1L;
+
+    private Sample optional;
+
+    public NestedSample(Sample optional) {
+        this.optional = optional;
+    }
+
+    public Sample getOptional() {
+        return optional;
+    }
+
+    public void setOptional(Sample optional) {
+        this.optional = optional;
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/pojo/Sample.java

@@ -0,0 +1,61 @@
+package com.baeldung.deserializationfilters.pojo;
+
+public class Sample implements ContextSpecific, Comparable<Sample> {
+    private static final long serialVersionUID = 1L;
+
+    private int[] array;
+    private String name;
+    private NestedSample nested;
+
+    public Sample(String name) {
+        this.name = name;
+    }
+
+    public Sample(int[] array) {
+        this.array = array;
+    }
+
+    public Sample(NestedSample nested) {
+        this.nested = nested;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int[] getArray() {
+        return array;
+    }
+
+    public void setArray(int[] array) {
+        this.array = array;
+    }
+
+    public NestedSample getNested() {
+        return nested;
+    }
+
+    public void setNested(NestedSample nested) {
+        this.nested = nested;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+
+    @Override
+    public int compareTo(Sample o) {
+        if (name == null)
+            return -1;
+
+        if (o == null || o.getName() == null)
+            return 1;
+
+        return getName().compareTo(o.getName());
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/pojo/SampleExploit.java

@@ -0,0 +1,25 @@
+package com.baeldung.deserializationfilters.pojo;
+
+public class SampleExploit extends Sample {
+    private static final long serialVersionUID = 1L;
+
+    public SampleExploit() {
+        super("exploit");
+    }
+
+    public static void maliciousCode() {
+        System.out.println("exploit executed");
+    }
+
+    @Override
+    public String toString() {
+        maliciousCode();
+        return "exploit";
+    }
+
+    @Override
+    public int compareTo(Sample o) {
+        maliciousCode();
+        return super.compareTo(o);
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/service/DeserializationService.java

@@ -0,0 +1,11 @@
+package com.baeldung.deserializationfilters.service;
+
+import java.io.InputStream;
+import java.util.Set;
+
+import com.baeldung.deserializationfilters.pojo.ContextSpecific;
+
+public interface DeserializationService {
+
+    Set<ContextSpecific> process(InputStream... inputStreams);
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/service/LimitedArrayService.java

@@ -0,0 +1,15 @@
+package com.baeldung.deserializationfilters.service;
+
+import java.io.InputStream;
+import java.util.Set;
+
+import com.baeldung.deserializationfilters.pojo.ContextSpecific;
+import com.baeldung.deserializationfilters.utils.DeserializationUtils;
+
+public class LimitedArrayService implements DeserializationService {
+
+    @Override
+    public Set<ContextSpecific> process(InputStream... inputStreams) {
+        return DeserializationUtils.deserializeIntoSet(inputStreams);
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/service/LowDepthService.java

@@ -0,0 +1,20 @@
+package com.baeldung.deserializationfilters.service;
+
+import java.io.InputStream;
+import java.io.ObjectInputFilter;
+import java.util.Set;
+
+import com.baeldung.deserializationfilters.pojo.ContextSpecific;
+import com.baeldung.deserializationfilters.utils.DeserializationUtils;
+
+public class LowDepthService implements DeserializationService {
+
+    public Set<ContextSpecific> process(ObjectInputFilter filter, InputStream... inputStreams) {
+        return DeserializationUtils.deserializeIntoSet(filter, inputStreams);
+    }
+
+    @Override
+    public Set<ContextSpecific> process(InputStream... inputStreams) {
+        return process(null, inputStreams);
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/service/SmallObjectService.java

@@ -0,0 +1,15 @@
+package com.baeldung.deserializationfilters.service;
+
+import java.io.InputStream;
+import java.util.Set;
+
+import com.baeldung.deserializationfilters.pojo.ContextSpecific;
+import com.baeldung.deserializationfilters.utils.DeserializationUtils;
+
+public class SmallObjectService implements DeserializationService {
+
+    @Override
+    public Set<ContextSpecific> process(InputStream... inputStreams) {
+        return DeserializationUtils.deserializeIntoSet(inputStreams);
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/utils/DeserializationUtils.java

@@ -0,0 +1,50 @@
+package com.baeldung.deserializationfilters.utils;
+
+import java.io.InputStream;
+import java.io.InvalidClassException;
+import java.io.ObjectInputFilter;
+import java.io.ObjectInputStream;
+import java.util.Set;
+import java.util.TreeSet;
+
+import com.baeldung.deserializationfilters.pojo.ContextSpecific;
+
+public class DeserializationUtils {
+    private DeserializationUtils() {
+    }
+
+    public static Object deserialize(InputStream inStream) {
+        return deserialize(inStream, null);
+    }
+
+    public static Object deserialize(InputStream inStream, ObjectInputFilter filter) {
+        try (ObjectInputStream in = new ObjectInputStream(inStream)) {
+            if (filter != null) {
+                in.setObjectInputFilter(filter);
+            }
+            return in.readObject();
+        } catch (InvalidClassException e) {
+            return null;
+        } catch (Throwable e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static Set<ContextSpecific> deserializeIntoSet(InputStream... inputStreams) {
+        return deserializeIntoSet(null, inputStreams);
+    }
+
+    public static Set<ContextSpecific> deserializeIntoSet(ObjectInputFilter filter, InputStream... inputStreams) {
+        Set<ContextSpecific> set = new TreeSet<>();
+
+        for (InputStream inputStream : inputStreams) {
+            Object object = deserialize(inputStream, filter);
+            if (object != null) {
+                set.add((ContextSpecific) object);
+            }
+        }
+
+        return set;
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/utils/FilterUtils.java

@@ -0,0 +1,32 @@
+package com.baeldung.deserializationfilters.utils;
+
+import java.io.ObjectInputFilter;
+
+public class FilterUtils {
+
+    private static final String DEFAULT_PACKAGE_PATTERN = "java.base/*;!*";
+    private static final String POJO_PACKAGE = "com.baeldung.deserializationfilters.pojo";
+
+    private FilterUtils() {
+    }
+
+    private static ObjectInputFilter baseFilter(String parameter, int max) {
+        return ObjectInputFilter.Config.createFilter(String.format("%s=%d;%s.**;%s", parameter, max, POJO_PACKAGE, DEFAULT_PACKAGE_PATTERN));
+    }
+
+    public static ObjectInputFilter fallbackFilter() {
+        return ObjectInputFilter.Config.createFilter(String.format("%s", DEFAULT_PACKAGE_PATTERN));
+    }
+
+    public static ObjectInputFilter safeSizeFilter(int max) {
+        return baseFilter("maxbytes", max);
+    }
+
+    public static ObjectInputFilter safeArrayFilter(int max) {
+        return baseFilter("maxarray", max);
+    }
+
+    public static ObjectInputFilter safeDepthFilter(int max) {
+        return baseFilter("maxdepth", max);
+    }
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/deserializationfilters/utils/SerializationUtils.java

@@ -0,0 +1,17 @@
+package com.baeldung.deserializationfilters.utils;
+
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.OutputStream;
+
+public class SerializationUtils {
+
+    private SerializationUtils() {
+    }
+
+    public static void serialize(Object object, OutputStream outStream) throws IOException {
+        try (ObjectOutputStream objStream = new ObjectOutputStream(outStream)) {
+            objStream.writeObject(object);
+        }
+    }
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/deserializationfilters/ContextSpecificDeserializationFilterIntegrationTest.java

@@ -0,0 +1,119 @@
+package com.baeldung.deserializationfilters;
+
+import static org.junit.Assert.assertNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputFilter;
+import java.util.Set;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import com.baeldung.deserializationfilters.pojo.ContextSpecific;
+import com.baeldung.deserializationfilters.pojo.NestedSample;
+import com.baeldung.deserializationfilters.pojo.Sample;
+import com.baeldung.deserializationfilters.pojo.SampleExploit;
+import com.baeldung.deserializationfilters.service.LimitedArrayService;
+import com.baeldung.deserializationfilters.service.LowDepthService;
+import com.baeldung.deserializationfilters.service.SmallObjectService;
+import com.baeldung.deserializationfilters.utils.DeserializationUtils;
+import com.baeldung.deserializationfilters.utils.FilterUtils;
+import com.baeldung.deserializationfilters.utils.SerializationUtils;
+
+public class ContextSpecificDeserializationFilterIntegrationTest {
+
+    private static ByteArrayOutputStream serialSampleA = new ByteArrayOutputStream();
+    private static ByteArrayOutputStream serialBigSampleA = new ByteArrayOutputStream();
+
+    private static ByteArrayOutputStream serialSampleB = new ByteArrayOutputStream();
+    private static ByteArrayOutputStream serialBigSampleB = new ByteArrayOutputStream();
+
+    private static ByteArrayOutputStream serialSampleC = new ByteArrayOutputStream();
+    private static ByteArrayOutputStream serialBigSampleC = new ByteArrayOutputStream();
+
+    private static ByteArrayInputStream bytes(ByteArrayOutputStream stream) {
+        return new ByteArrayInputStream(stream.toByteArray());
+    }
+
+    @BeforeAll
+    static void setup() throws IOException {
+        ObjectInputFilter.Config.setSerialFilterFactory(new ContextSpecificDeserializationFilterFactory());
+
+        SerializationUtils.serialize(new Sample("simple"), serialSampleA);
+        SerializationUtils.serialize(new SampleExploit(), serialBigSampleA);
+
+        SerializationUtils.serialize(new Sample(new int[] { 1, 2, 3 }), serialSampleB);
+        SerializationUtils.serialize(new Sample(new int[] { 1, 2, 3, 4, 5, 6 }), serialBigSampleB);
+
+        SerializationUtils.serialize(new Sample(new NestedSample(null)), serialSampleC);
+        SerializationUtils.serialize(new Sample(new NestedSample(new Sample("deep"))), serialBigSampleC);
+    }
+
+    @Test
+    void whenSmallObjectContext_thenCorrectFilterApplied() {
+        Set<ContextSpecific> result = new SmallObjectService().process( //
+            bytes(serialSampleA), //
+            bytes(serialBigSampleA));
+
+        assertEquals(1, result.size());
+        assertEquals("simple", ((Sample) result.iterator()
+            .next()).getName());
+    }
+
+    @Test
+    void whenLimitedArrayContext_thenCorrectFilterApplied() {
+        Set<ContextSpecific> result = new LimitedArrayService().process( //
+            bytes(serialSampleB), //
+            bytes(serialBigSampleB));
+
+        assertEquals(1, result.size());
+    }
+
+    @Test
+    void whenLowDepthContext_thenCorrectFilterApplied() {
+        Set<ContextSpecific> result = new LowDepthService().process( //
+            bytes(serialSampleC), //
+            bytes(serialBigSampleC));
+
+        assertEquals(1, result.size());
+    }
+
+    @Test
+    void givenExtraFilter_whenCombinedContext_thenMergedFiltersApplied() {
+        Set<ContextSpecific> result = new LowDepthService().process( //
+            FilterUtils.safeSizeFilter(190), //
+            bytes(serialSampleA), //
+            bytes(serialBigSampleA), //
+            bytes(serialSampleC), //
+            bytes(serialBigSampleC));
+
+        assertEquals(1, result.size());
+        assertEquals("simple", ((Sample) result.iterator()
+            .next()).getName());
+    }
+
+    @Test
+    void givenFallbackContext_whenUsingBaseClasses_thenRestrictiveFilterApplied() throws IOException {
+        String a = new String("a");
+        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
+        SerializationUtils.serialize(a, outStream);
+
+        String deserializedA = (String) DeserializationUtils.deserialize(bytes(outStream));
+
+        assertEquals(a, deserializedA);
+    }
+
+    @Test
+    void givenFallbackContext_whenUsingAppClasses_thenRejected() throws IOException {
+        Sample a = new Sample("a");
+        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
+        SerializationUtils.serialize(a, outStream);
+
+        Sample deserializedA = (Sample) DeserializationUtils.deserialize(bytes(outStream));
+
+        assertNull(deserializedA);
+    }
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/recordproperties/ReadRecordPropertiesByReflectionUnitTest.java

@@ -0,0 +1,89 @@
+package com.baeldung.recordproperties;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.RecordComponent;
+import java.util.ArrayList;
+
+import org.junit.jupiter.api.Test;
+
+record Player(String name, int age, Long score) {
+}
+
+public class ReadRecordPropertiesByReflectionUnitTest {
+    private static final Player ERIC = new Player("Eric", 28, 4242L);
+
+    @Test
+    void whenUsingRecordComponent_thenGetExpectedResult() {
+        var fields = new ArrayList<Field>();
+        RecordComponent[] components = Player.class.getRecordComponents();
+        for (var comp : components) {
+            try {
+                Field field = ERIC.getClass()
+                  .getDeclaredField(comp.getName());
+                field.setAccessible(true);
+                fields.add(field);
+            } catch (NoSuchFieldException e) {
+                // for simplicity, error handling is skipped
+            }
+        }
+
+        assertEquals(3, fields.size());
+
+        var nameField = fields.get(0);
+        var ageField = fields.get(1);
+        var scoreField = fields.get(2);
+        try {
+            assertEquals("name", nameField.getName());
+            assertEquals(String.class, nameField.getType());
+            assertEquals("Eric", nameField.get(ERIC));
+
+            assertEquals("age", ageField.getName());
+            assertEquals(int.class, ageField.getType());
+            assertEquals(28, ageField.get(ERIC));
+
+            assertEquals("score", scoreField.getName());
+            assertEquals(Long.class, scoreField.getType());
+            assertEquals(4242L, scoreField.get(ERIC));
+        } catch (IllegalAccessException exception) {
+            // for simplicity, error handling is skipped
+        }
+
+    }
+
+    @Test
+    void whenUsingClassGetDeclaredField_thenGetExpectedResult() {
+        // record has no public fields
+        assertEquals(0, Player.class.getFields().length);
+
+        var fields = new ArrayList<Field>();
+        for (var field : Player.class.getDeclaredFields()) {
+            field.setAccessible(true);
+            fields.add(field);
+        }
+
+        assertEquals(3, fields.size());
+        var nameField = fields.get(0);
+        var ageField = fields.get(1);
+        var scoreField = fields.get(2);
+
+        try {
+            assertEquals("name", nameField.getName());
+            assertEquals(String.class, nameField.getType());
+            assertEquals("Eric", nameField.get(ERIC));
+
+            assertEquals("age", ageField.getName());
+            assertEquals(int.class, ageField.getType());
+            assertEquals(28, ageField.get(ERIC));
+
+            assertEquals("score", scoreField.getName());
+            assertEquals(Long.class, scoreField.getType());
+            assertEquals(4242L, scoreField.get(ERIC));
+        } catch (IllegalAccessException ex) {
+            // for simplicity, error handling is skipped
+        }
+
+    }
+
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/sealed/classes/VehicleUnitTest.java

@@ -18,19 +18,19 @@ public class VehicleUnitTest {
     }
 
     @Test
-    public void givenCar_whenUsingReflectionAPI_thenSuperClassIsSealed() {
+    public void givenCar_whenUsingReflectionAPI_thenSuperClassIsSealed() throws ClassNotFoundException {
         Assertions.assertThat(car.getClass().isSealed()).isEqualTo(false);
         Assertions.assertThat(car.getClass().getSuperclass().isSealed()).isEqualTo(true);
         Assertions.assertThat(car.getClass().getSuperclass().getPermittedSubclasses())
-                .contains(ClassDesc.of(car.getClass().getCanonicalName()));
+                .contains(Class.forName(car.getClass().getCanonicalName()));
     }
 
     @Test
-    public void givenTruck_whenUsingReflectionAPI_thenSuperClassIsSealed() {
+    public void givenTruck_whenUsingReflectionAPI_thenSuperClassIsSealed() throws ClassNotFoundException {
         Assertions.assertThat(truck.getClass().isSealed()).isEqualTo(false);
         Assertions.assertThat(truck.getClass().getSuperclass().isSealed()).isEqualTo(true);
         Assertions.assertThat(truck.getClass().getSuperclass().getPermittedSubclasses())
-                .contains(ClassDesc.of(truck.getClass().getCanonicalName()));
+                .contains(Class.forName(truck.getClass().getCanonicalName()));
     }
 
     @Test

core-java-modules/core-java-17/src/test/java/com/baeldung/sealed/records/VehicleUnitTest.java

@@ -18,19 +18,19 @@ public class VehicleUnitTest {
     }
 
     @Test
-    public void givenCar_whenUsingReflectionAPI_thenInterfaceIsSealed() {
+    public void givenCar_whenUsingReflectionAPI_thenInterfaceIsSealed() throws ClassNotFoundException {
         Assertions.assertThat(car.getClass().isSealed()).isEqualTo(false);
         Assertions.assertThat(car.getClass().getInterfaces()[0].isSealed()).isEqualTo(true);
-        Assertions.assertThat(car.getClass().getInterfaces()[0].permittedSubclasses())
+        Assertions.assertThat(car.getClass().getInterfaces()[0].getPermittedSubclasses())
-                .contains(ClassDesc.of(car.getClass().getCanonicalName()));
+                .contains(Class.forName(car.getClass().getCanonicalName()));
     }
 
     @Test
-    public void givenTruck_whenUsingReflectionAPI_thenInterfaceIsSealed() {
+    public void givenTruck_whenUsingReflectionAPI_thenInterfaceIsSealed() throws ClassNotFoundException {
         Assertions.assertThat(truck.getClass().isSealed()).isEqualTo(false);
         Assertions.assertThat(truck.getClass().getInterfaces()[0].isSealed()).isEqualTo(true);
-        Assertions.assertThat(truck.getClass().getInterfaces()[0].permittedSubclasses())
+        Assertions.assertThat(truck.getClass().getInterfaces()[0].getPermittedSubclasses())
-                .contains(ClassDesc.of(truck.getClass().getCanonicalName()));
+                .contains(Class.forName(truck.getClass().getCanonicalName()));
     }
 
     @Test

core-java-modules/core-java-18/README.md

@@ -0,0 +1,2 @@
+## Relevant Articles
+- [Deprecate Finalization in Java 18](https://www.baeldung.com/java-18-deprecate-finalization)

core-java-modules/core-java-18/pom.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-18</artifactId>
+    <name>core-java-18</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <release>${maven.compiler.release}</release>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${surefire.plugin.version}</version>
+                <configuration>
+                    <forkCount>1</forkCount>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.apache.maven.surefire</groupId>
+                        <artifactId>surefire-api</artifactId>
+                        <version>${surefire.plugin.version}</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source.version>18</maven.compiler.source.version>
+        <maven.compiler.target.version>18</maven.compiler.target.version>
+        <maven.compiler.release>18</maven.compiler.release>
+        <surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
+    </properties>
+
+</project>

core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/FinalizationExamples.java

@@ -0,0 +1,27 @@
+package com.baeldung.finalization_closeable_cleaner;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+
+public class FinalizationExamples {
+    FileInputStream fis = null;
+
+    public void readFileOperationWithFinalization() throws IOException {
+        try {
+            fis = new FileInputStream("input.txt");
+            // perform operation on the file
+            System.out.println(fis.readAllBytes().length);
+
+        } finally {
+            if (fis != null)
+                fis.close();
+        }
+    }
+
+    public void readFileOperationWithTryWith() throws IOException {
+        try (FileInputStream fis = new FileInputStream("input.txt")) {
+            // perform operations
+            System.out.println(fis.readAllBytes().length);
+        }
+    }
+}

core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyCleanerResourceClass.java

@@ -0,0 +1,48 @@
+package com.baeldung.finalization_closeable_cleaner;
+
+import java.lang.ref.Cleaner;
+
+public class MyCleanerResourceClass implements AutoCloseable {
+    private static Resource resource;
+
+    private static final Cleaner cleaner = Cleaner.create();
+    private final Cleaner.Cleanable cleanable;
+
+    public MyCleanerResourceClass() {
+        resource = new Resource();
+        this.cleanable = cleaner.register(this, new CleaningState());
+    }
+
+    public void useResource() {
+        // using the resource here
+        resource.use();
+    }
+
+    @Override
+    public void close() {
+        // perform actions to close all underlying resources
+        this.cleanable.clean();
+    }
+
+    static class CleaningState implements Runnable {
+        CleaningState() {
+            // constructor
+        }
+
+        @Override
+        public void run() {
+            // some cleanup action
+            System.out.println("Cleanup done");
+        }
+    }
+
+    static class Resource {
+        void use() {
+            System.out.println("Using the resource");
+        }
+
+        void close() {
+            System.out.println("Cleanup done");
+        }
+    }
+}

core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyCloseableResourceClass.java

@@ -0,0 +1,25 @@
+package com.baeldung.finalization_closeable_cleaner;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public class MyCloseableResourceClass implements AutoCloseable {
+
+    private final FileInputStream fis;
+
+    public MyCloseableResourceClass() throws FileNotFoundException {
+        this.fis = new FileInputStream("src/main/resources/file.txt");
+
+    }
+
+    public int getByteLength() throws IOException {
+        System.out.println("Some operation");
+        return this.fis.readAllBytes().length;
+    }
+    @Override
+    public void close() throws IOException {
+        System.out.println("Finalized object");
+        this.fis.close();
+    }
+}

core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyFinalizableResourceClass.java

@@ -0,0 +1,24 @@
+package com.baeldung.finalization_closeable_cleaner;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public class MyFinalizableResourceClass {
+    private FileInputStream fis;
+
+    public MyFinalizableResourceClass() throws FileNotFoundException {
+        this.fis = new FileInputStream("src/main/resources/file.txt");
+    }
+
+    public int getByteLength() throws IOException {
+        System.out.println("Some operation");
+        return this.fis.readAllBytes().length;
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        System.out.println("Finalized object");
+        this.fis.close();
+    }
+}