Merge branch 'eugenp:master' into master

algorithms-modules/algorithms-miscellaneous-7/src/main/java/com/baeldung/algorithms/pixelarray/GetPixelArray.java

@@ -0,0 +1,65 @@
+package com.baeldung.algorithms.pixelarray;
+
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferByte;
+public class GetPixelArray {
+
+    public static int[][] get2DPixelArraySlow(BufferedImage sampleImage) {
+        int width = sampleImage.getWidth();
+        int height = sampleImage.getHeight();
+        int[][] result = new int[height][width];
+
+        for (int row = 0; row < height; row++) {
+            for (int col = 0; col < width; col++) {
+                result[row][col] = sampleImage.getRGB(col, row);
+            }
+        }
+
+        return result;
+    }
+
+    public static int[][] get2DPixelArrayFast(BufferedImage image) {
+        final byte[] pixelData = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
+        final int width = image.getWidth();
+        final int height = image.getHeight();
+        final boolean hasAlphaChannel = image.getAlphaRaster() != null;
+
+        int[][] result = new int[height][width];
+        if (hasAlphaChannel) {
+            final int numberOfValues = 4;
+            for (int valueIndex = 0, row = 0, col = 0; valueIndex + numberOfValues - 1 < pixelData.length; valueIndex += numberOfValues) {
+                // Getting the values for each pixel from the pixelData array.
+                int argb = 0;
+                argb += (((int) pixelData[valueIndex] & 0xff) << 24); // alpha value
+                argb += ((int) pixelData[valueIndex + 1] & 0xff); // blue value
+                argb += (((int) pixelData[valueIndex + 2] & 0xff) << 8); // green value
+                argb += (((int) pixelData[valueIndex + 3] & 0xff) << 16); // red value
+                result[row][col] = argb;
+
+                col++;
+                if (col == width) {
+                    col = 0;
+                    row++;
+                }
+            }
+        } else {
+            final int numberOfValues = 3;
+            for (int valueIndex = 0, row = 0, col = 0; valueIndex + numberOfValues - 1 < pixelData.length; valueIndex += numberOfValues) {
+                int argb = 0;
+                argb += -16777216; // 255 alpha value (fully opaque)
+                argb += ((int) pixelData[valueIndex] & 0xff); // blue value
+                argb += (((int) pixelData[valueIndex + 1] & 0xff) << 8); // green value
+                argb += (((int) pixelData[valueIndex + 2] & 0xff) << 16); // red value
+                result[row][col] = argb;
+
+                col++;
+                if (col == width) {
+                    col = 0;
+                    row++;
+                }
+            }
+        }
+
+        return result;
+    }
+}

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/pixelarray/GetPixelArrayUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.algorithms.pixelarray;
+
+import static com.baeldung.algorithms.pixelarray.GetPixelArray.get2DPixelArrayFast;
+import static com.baeldung.algorithms.pixelarray.GetPixelArray.get2DPixelArraySlow;
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+
+public class GetPixelArrayUnitTest {
+    @Test
+    public void givenImage_whenGetPixelArray_thenBothMethodsReturnEqualValues() {
+        BufferedImage sampleImage = null;
+        try {
+            sampleImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+
+        int[][] firstResult = get2DPixelArraySlow(sampleImage);
+        int[][] secondResult = get2DPixelArrayFast(sampleImage);
+
+        assertTrue(Arrays.deepEquals(firstResult, secondResult));
+    }
+}

apache-httpclient-2/README.md

@@ -13,4 +13,5 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [How To Get Cookies From the Apache HttpClient Response](https://www.baeldung.com/java-apache-httpclient-cookies)
 - [Enabling Logging for Apache HttpClient](https://www.baeldung.com/apache-httpclient-enable-logging)
 - [Apache HttpClient vs. CloseableHttpClient](https://www.baeldung.com/apache-httpclient-vs-closeablehttpclient)
+- [Expand Shortened URLs with Apache HttpClient](https://www.baeldung.com/apache-httpclient-expand-url)
 - More articles: [[<-- prev]](../apache-httpclient)

apache-httpclient-2/src/test/java/com/baeldung/httpclient/expandUrl/HttpClientExpandUrlLiveTest.java

@@ -0,0 +1,126 @@
+package com.baeldung.httpclient.expandUrl;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
+
+import java.io.IOException;
+import java.util.List;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+
+import org.apache.hc.client5.http.classic.methods.HttpHead;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
+
+import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
+import org.apache.hc.core5.http.Header;
+import org.apache.hc.core5.http.HttpHeaders;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class HttpClientExpandUrlLiveTest {
+
+    private static CloseableHttpClient httpClient;
+
+    @BeforeAll
+    static void setup() {
+        httpClient = HttpClientBuilder.create()
+            .disableRedirectHandling()
+            .build();
+    }
+
+    @AfterAll
+    static void tearDown() throws IOException {
+        if (httpClient != null) {
+            httpClient.close();
+        }
+    }
+
+    @Test
+    void givenShortenedOnce_whenUrlIsExpanded_thenCorrectResult() throws IOException {
+        final String expectedResult = "https://www.baeldung.com/rest-versioning";
+        final String actualResult = expandSingleLevel("http://bit.ly/3LScTri");
+        assertThat(actualResult, equalTo(expectedResult));
+    }
+
+    @Test
+    void givenShortenedMultiple_whenUrlIsExpanded_thenCorrectResult() throws IOException {
+        final String expectedResult = "https://www.baeldung.com/rest-versioning";
+        final String actualResult = expand("http://t.co/e4rDDbnzmk");
+        assertThat(actualResult, equalTo(expectedResult));
+    }
+
+    private String expand(final String urlArg) throws IOException {
+        String originalUrl = urlArg;
+        String newUrl = expandSingleLevel(originalUrl);
+        while (!originalUrl.equals(newUrl)) {
+            originalUrl = newUrl;
+            newUrl = expandSingleLevel(originalUrl);
+        }
+
+        return newUrl;
+    }
+
+    final String expandSafe(final String urlArg) throws IOException {
+        String originalUrl = urlArg;
+        String newUrl = expandSingleLevelSafe(originalUrl).getRight();
+        final List<String> alreadyVisited = Lists.newArrayList(originalUrl, newUrl);
+        while (!originalUrl.equals(newUrl)) {
+            originalUrl = newUrl;
+            final Pair<Integer, String> statusAndUrl = expandSingleLevelSafe(originalUrl);
+            newUrl = statusAndUrl.getRight();
+            final boolean isRedirect = statusAndUrl.getLeft() == 301 || statusAndUrl.getLeft() == 302;
+            if (isRedirect && alreadyVisited.contains(newUrl)) {
+                throw new IllegalStateException("Likely a redirect loop");
+            }
+            alreadyVisited.add(newUrl);
+        }
+
+        return newUrl;
+    }
+
+    private Pair<Integer, String> expandSingleLevelSafe(final String url) throws IOException {
+        try {
+            HttpHead request = new HttpHead(url);
+            Pair<Integer, String> resp = httpClient.execute(request, response -> {
+                final int statusCode = response.getCode();
+                if (statusCode != 301 && statusCode != 302) {
+                    return new ImmutablePair<>(statusCode, url);
+                }
+                final Header[] headers = response.getHeaders(HttpHeaders.LOCATION);
+                Preconditions.checkState(headers.length == 1);
+                final String newUrl = headers[0].getValue();
+
+                return new ImmutablePair<>(statusCode, newUrl);
+            });
+            return resp;
+        } catch (final IllegalArgumentException uriEx) {
+            return new ImmutablePair<>(500, url);
+        }
+    }
+
+    private String expandSingleLevel(final String url) throws IOException {
+        try {
+            HttpHead request = new HttpHead(url);
+            String expandedUrl = httpClient.execute(request, response -> {
+                final int statusCode = response.getCode();
+                if (statusCode != 301 && statusCode != 302) {
+                    return url;
+                }
+                final Header[] headers = response.getHeaders(HttpHeaders.LOCATION);
+                Preconditions.checkState(headers.length == 1);
+
+                return headers[0].getValue();
+            });
+            return expandedUrl;
+        } catch (final IllegalArgumentException uriEx) {
+            return url;
+        }
+    }
+
+}

aws-modules/aws-lambda-modules/lambda-function/pom.xml

@@ -3,9 +3,9 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <artifactId>lambda</artifactId>
+    <artifactId>lambda-function</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>lambda</name>
+    <name>lambda-function</name>
     <packaging>jar</packaging>
 
     <parent>

aws-modules/aws-s3/README.md

@@ -6,4 +6,5 @@ This module contains articles about Simple Storage Service (S3) on AWS
 
 - [AWS S3 with Java](https://www.baeldung.com/aws-s3-java)
 - [Multipart Uploads in Amazon S3 with Java](https://www.baeldung.com/aws-s3-multipart-upload)
-- [Using the JetS3t Java Client With Amazon S3](https://www.baeldung.com/jets3t-amazon-s3)
+- [Using the JetS3t Java Client With Amazon S3](https://www.baeldung.com/jets3t-amazon-s3)
+- [Check if a Specified Key Exists in a Given S3 Bucket Using Java](https://www.baeldung.com/java-aws-s3-check-specified-key-exists)

core-java-modules/core-java-19/README.md

@@ -1,3 +1,4 @@
 ## Relevant Articles
 - [Record Patterns in Java 19](https://www.baeldung.com/java-19-record-patterns)
 - [Structured Concurrency in Java 19](https://www.baeldung.com/java-structured-concurrency)
+- [Possible Root Causes for High CPU Usage in Java](https://www.baeldung.com/java-high-cpu-usage-causes)

core-java-modules/core-java-20/README.md

@@ -0,0 +1,2 @@
+## Relevant Articles
+- TBD

core-java-modules/core-java-20/pom.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>core-java-20</artifactId>
+
+    <properties>
+        <maven.compiler.source>20</maven.compiler.source>
+        <maven.compiler.target>20</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>20</source>
+                    <target>20</target>
+                    <compilerArgs>
+                        <arg>--enable-preview</arg>
+                        <arg>--add-modules=jdk.incubator.concurrent</arg>
+                    </compilerArgs>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <argLine>--enable-preview --add-modules=jdk.incubator.concurrent</argLine>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>jakarta.servlet</groupId>
+            <artifactId>jakarta.servlet-api</artifactId>
+            <version>6.0.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.24.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <version>5.2.0</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/classic/Controller.java

@@ -0,0 +1,33 @@
+package com.baeldung.scopedvalues.classic;
+
+import com.baeldung.scopedvalues.data.Data;
+import com.baeldung.scopedvalues.data.User;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.Optional;
+
+public class Controller {
+
+    private final Service service = new Service();
+
+    public void processRequest(HttpServletRequest request, HttpServletResponse response, User loggedInUser) {
+        Optional<Data> data = service.getData(request, loggedInUser);
+        if (data.isPresent()) {
+            try {
+                PrintWriter out = response.getWriter();
+                response.setContentType("application/json");
+                out.print(data.get());
+                out.flush();
+                response.setStatus(200);
+            } catch (IOException e) {
+                response.setStatus(500);
+            }
+        } else {
+            response.setStatus(400);
+        }
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/classic/Repository.java

@@ -0,0 +1,16 @@
+package com.baeldung.scopedvalues.classic;
+
+import com.baeldung.scopedvalues.data.Data;
+import com.baeldung.scopedvalues.data.User;
+
+import java.util.Optional;
+
+public class Repository {
+
+    public Optional<Data> getData(String id, User user) {
+        return user.isAdmin()
+                ? Optional.of(new Data(id, "Title 1", "Description 1"))
+                : Optional.empty();
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/classic/Server.java

@@ -0,0 +1,42 @@
+package com.baeldung.scopedvalues.classic;
+
+import com.baeldung.scopedvalues.data.User;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.*;
+
+public class Server {
+
+    private static final List<User> AUTHENTICATED_USERS = List.of(
+            new User("1", "admin", "123456", true),
+            new User("2", "user", "123456", false)
+    );
+    private final Controller controller = new Controller();
+    private final ExecutorService executor = Executors.newFixedThreadPool(5);
+
+    public void serve(HttpServletRequest request, HttpServletResponse response) throws InterruptedException, ExecutionException {
+        Optional<User> user = authenticateUser(request);
+        if (user.isPresent()) {
+            Future<?> future = executor.submit(() ->
+                    controller.processRequest(request, response, user.get()));
+            future.get();
+        } else {
+            response.setStatus(401);
+        }
+    }
+
+    private Optional<User> authenticateUser(HttpServletRequest request) {
+        return AUTHENTICATED_USERS.stream()
+                .filter(user -> checkUserPassword(user, request))
+                .findFirst();
+    }
+
+    private boolean checkUserPassword(User user, HttpServletRequest request) {
+        return user.name().equals(request.getParameter("user_name"))
+                && user.password().equals(request.getParameter("user_pw"));
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/classic/Service.java

@@ -0,0 +1,18 @@
+package com.baeldung.scopedvalues.classic;
+
+import com.baeldung.scopedvalues.data.Data;
+import com.baeldung.scopedvalues.data.User;
+import jakarta.servlet.http.HttpServletRequest;
+
+import java.util.Optional;
+
+public class Service {
+
+    private final Repository repository = new Repository();
+
+    public Optional<Data> getData(HttpServletRequest request, User loggedInUser) {
+        String id = request.getParameter("data_id");
+        return repository.getData(id, loggedInUser);
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/data/Data.java

@@ -0,0 +1,3 @@
+package com.baeldung.scopedvalues.data;
+
+public record Data(String id, String title, String description) {}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/data/User.java

@@ -0,0 +1,3 @@
+package com.baeldung.scopedvalues.data;
+
+public record User(String id, String name, String password, boolean isAdmin) {}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/Controller.java

@@ -0,0 +1,37 @@
+package com.baeldung.scopedvalues.scoped;
+
+import com.baeldung.scopedvalues.data.Data;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jdk.incubator.concurrent.ScopedValue;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.Optional;
+
+public class Controller {
+
+    private final Service internalService = new Service();
+
+    public void processRequest(HttpServletRequest request, HttpServletResponse response) {
+        Optional<Data> data = internalService.getData(request);
+
+        ScopedValue.where(Server.LOGGED_IN_USER, null)
+                .run(internalService::extractData);
+
+        if (data.isPresent()) {
+            try {
+                PrintWriter out = response.getWriter();
+                response.setContentType("application/json");
+                out.print(data.get());
+                out.flush();
+                response.setStatus(200);
+            } catch (IOException e) {
+                response.setStatus(500);
+            }
+        } else {
+            response.setStatus(400);
+        }
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/Repository.java

@@ -0,0 +1,17 @@
+package com.baeldung.scopedvalues.scoped;
+
+import com.baeldung.scopedvalues.data.Data;
+import com.baeldung.scopedvalues.data.User;
+
+import java.util.Optional;
+
+public class Repository {
+
+    public Optional<Data> getData(String id) {
+        User loggedInUser = Server.LOGGED_IN_USER.get();
+        return loggedInUser.isAdmin()
+                ? Optional.of(new Data(id, "Title 1", "Description 1"))
+                : Optional.empty();
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/Server.java

@@ -0,0 +1,41 @@
+package com.baeldung.scopedvalues.scoped;
+
+import com.baeldung.scopedvalues.data.User;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jdk.incubator.concurrent.ScopedValue;
+
+import java.util.List;
+import java.util.Optional;
+
+public class Server {
+
+    private static final List<User> AUTHENTICATED_USERS = List.of(
+            new User("1", "admin", "123456", true),
+            new User("2", "user", "123456", false)
+    );
+    public final static ScopedValue<User> LOGGED_IN_USER = ScopedValue.newInstance();
+    private final Controller controller = new Controller();
+
+    public void serve(HttpServletRequest request, HttpServletResponse response) {
+        Optional<User> user = authenticateUser(request);
+        if (user.isPresent()) {
+            ScopedValue.where(LOGGED_IN_USER, user.get())
+                    .run(() -> controller.processRequest(request, response));
+        } else {
+            response.setStatus(401);
+        }
+    }
+
+    private Optional<User> authenticateUser(HttpServletRequest request) {
+        return AUTHENTICATED_USERS.stream()
+                .filter(user -> checkUserPassword(user, request))
+                .findFirst();
+    }
+
+    private boolean checkUserPassword(User user, HttpServletRequest request) {
+        return user.name().equals(request.getParameter("user_name"))
+                && user.password().equals(request.getParameter("user_pw"));
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/Service.java

@@ -0,0 +1,23 @@
+package com.baeldung.scopedvalues.scoped;
+
+import com.baeldung.scopedvalues.data.Data;
+import com.baeldung.scopedvalues.data.User;
+import jakarta.servlet.http.HttpServletRequest;
+
+import java.util.Optional;
+
+public class Service {
+
+    private final Repository repository = new Repository();
+
+    public Optional<Data> getData(HttpServletRequest request) {
+        String id = request.getParameter("data_id");
+        return repository.getData(id);
+    }
+
+    public void extractData() {
+        User loggedInUser = Server.LOGGED_IN_USER.get();
+        assert loggedInUser == null;
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/inheriting/Controller.java

@@ -0,0 +1,44 @@
+package com.baeldung.scopedvalues.scoped.inheriting;
+
+import com.baeldung.scopedvalues.data.Data;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jdk.incubator.concurrent.StructuredTaskScope;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.Optional;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+public class Controller {
+
+    private final InternalService internalService = new InternalService();
+    private final ExternalService externalService = new ExternalService();
+
+    public void processRequest(HttpServletRequest request, HttpServletResponse response) {
+        try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
+            Future<Optional<Data>> internalData = scope.fork(() -> internalService.getData(request));
+            Future<String> externalData = scope.fork(externalService::getData);
+            try {
+                scope.join();
+                scope.throwIfFailed();
+
+                Optional<Data> data = internalData.resultNow();
+                if (data.isPresent()) {
+                    PrintWriter out = response.getWriter();
+                    response.setContentType("application/json");
+                    out.println(data.get());
+                    out.print(externalData.resultNow());
+                    out.flush();
+                    response.setStatus(200);
+                } else {
+                    response.setStatus(400);
+                }
+            } catch (InterruptedException | ExecutionException | IOException e) {
+                response.setStatus(500);
+            }
+        }
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/inheriting/ExternalService.java

@@ -0,0 +1,9 @@
+package com.baeldung.scopedvalues.scoped.inheriting;
+
+public class ExternalService {
+
+    public String getData() {
+        return "External data";
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/inheriting/InternalService.java

@@ -0,0 +1,17 @@
+package com.baeldung.scopedvalues.scoped.inheriting;
+
+import com.baeldung.scopedvalues.data.Data;
+import jakarta.servlet.http.HttpServletRequest;
+
+import java.util.Optional;
+
+public class InternalService {
+
+    private final Repository repository = new Repository();
+
+    public Optional<Data> getData(HttpServletRequest request) {
+        String id = request.getParameter("data_id");
+        return repository.getData(id);
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/inheriting/Repository.java

@@ -0,0 +1,17 @@
+package com.baeldung.scopedvalues.scoped.inheriting;
+
+import com.baeldung.scopedvalues.data.Data;
+import com.baeldung.scopedvalues.data.User;
+
+import java.util.Optional;
+
+public class Repository {
+
+    public Optional<Data> getData(String id) {
+        User loggedInUser = Server.LOGGED_IN_USER.get();
+        return loggedInUser.isAdmin()
+                ? Optional.of(new Data(id, "Title 1", "Description 1"))
+                : Optional.empty();
+    }
+
+}

core-java-modules/core-java-20/src/main/java/com/baeldung/scopedvalues/scoped/inheriting/Server.java

@@ -0,0 +1,41 @@
+package com.baeldung.scopedvalues.scoped.inheriting;
+
+import com.baeldung.scopedvalues.data.User;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jdk.incubator.concurrent.ScopedValue;
+
+import java.util.List;
+import java.util.Optional;
+
+public class Server {
+
+    private static final List<User> AUTHENTICATED_USERS = List.of(
+            new User("1", "admin", "123456", true),
+            new User("2", "user", "123456", false)
+    );
+    public final static ScopedValue<User> LOGGED_IN_USER = ScopedValue.newInstance();
+    private final Controller controller = new Controller();
+
+    public void serve(HttpServletRequest request, HttpServletResponse response) {
+        Optional<User> user = authenticateUser(request);
+        if (user.isPresent()) {
+            ScopedValue.where(LOGGED_IN_USER, user.get())
+                    .run(() -> controller.processRequest(request, response));
+        } else {
+            response.setStatus(401);
+        }
+    }
+
+    private Optional<User> authenticateUser(HttpServletRequest request) {
+        return AUTHENTICATED_USERS.stream()
+                .filter(user -> checkUserPassword(user, request))
+                .findFirst();
+    }
+
+    private boolean checkUserPassword(User user, HttpServletRequest request) {
+        return user.name().equals(request.getParameter("user_name"))
+                && user.password().equals(request.getParameter("user_pw"));
+    }
+
+}

core-java-modules/core-java-20/src/test/java/com/baeldung/scopedvalues/classic/ServerUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.scopedvalues.classic;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.concurrent.ExecutionException;
+
+import static org.mockito.Mockito.*;
+import static org.assertj.core.api.Assertions.*;
+@ExtendWith(MockitoExtension.class)
+public class ServerUnitTest {
+
+    @Mock
+    private HttpServletRequest request;
+
+    @Mock
+    private HttpServletResponse response;
+
+    private final StringWriter writer = new StringWriter();
+
+    private final Server server = new Server();
+
+    @Test
+    void givenMockedRequestWithAdminCredentials_whenServeMethodIsCalled_thenDataIsReturned() throws InterruptedException, IOException, ExecutionException {
+        when(request.getParameter("user_name")).thenReturn("admin");
+        when(request.getParameter("user_pw")).thenReturn("123456");
+        when(request.getParameter("data_id")).thenReturn("1");
+        when(response.getWriter()).thenReturn(new PrintWriter(writer));
+
+        server.serve(request, response);
+
+        assertThat(writer.toString()).isEqualTo("Data[id=1, title=Title 1, description=Description 1]");
+    }
+
+    @Test
+    void givenMockedRequestWithUserCredentials_whenServeMethodIsCalled_thenNoDataIsReturned() throws InterruptedException, ExecutionException {
+        when(request.getParameter("user_name")).thenReturn("user");
+        when(request.getParameter("user_pw")).thenReturn("123456");
+
+        server.serve(request, response);
+
+        assertThat(writer.toString()).isEqualTo("");
+    }
+
+}

core-java-modules/core-java-20/src/test/java/com/baeldung/scopedvalues/scoped/ServerUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.scopedvalues.scoped;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+public class ServerUnitTest {
+
+    @Mock
+    private HttpServletRequest request;
+
+    @Mock
+    private HttpServletResponse response;
+
+    private final StringWriter writer = new StringWriter();
+
+    private final Server server = new Server();
+
+    @Test
+    void givenMockedRequestWithAdminCredentials_whenServeMethodIsCalled_thenDataIsReturned() throws IOException {
+        when(request.getParameter("user_name")).thenReturn("admin");
+        when(request.getParameter("user_pw")).thenReturn("123456");
+        when(request.getParameter("data_id")).thenReturn("1");
+        when(response.getWriter()).thenReturn(new PrintWriter(writer));
+
+        server.serve(request, response);
+
+        assertThat(writer.toString()).isEqualTo("Data[id=1, title=Title 1, description=Description 1]");
+    }
+
+    @Test
+    void givenMockedRequestWithUserCredentials_whenServeMethodIsCalled_thenNoDataIsReturned() throws IOException {
+        when(request.getParameter("user_name")).thenReturn("user");
+        when(request.getParameter("user_pw")).thenReturn("123456");
+
+        server.serve(request, response);
+
+        assertThat(writer.toString()).isEqualTo("");
+    }
+
+}

core-java-modules/core-java-20/src/test/java/com/baeldung/scopedvalues/scoped/inheriting/ServerUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.scopedvalues.scoped.inheriting;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+public class ServerUnitTest {
+
+    @Mock
+    private HttpServletRequest request;
+
+    @Mock
+    private HttpServletResponse response;
+
+    private final StringWriter writer = new StringWriter();
+
+    private final Server server = new Server();
+
+    @Test
+    void givenMockedRequestWithAdminCredentials_whenServeMethodIsCalled_thenDataIsReturned() throws IOException {
+        when(request.getParameter("user_name")).thenReturn("admin");
+        when(request.getParameter("user_pw")).thenReturn("123456");
+        when(request.getParameter("data_id")).thenReturn("1");
+        when(response.getWriter()).thenReturn(new PrintWriter(writer));
+
+        server.serve(request, response);
+
+        assertThat(writer.toString()).isEqualTo("Data[id=1, title=Title 1, description=Description 1]\nExternal data");
+    }
+
+    @Test
+    void givenMockedRequestWithUserCredentials_whenServeMethodIsCalled_thenNoDataIsReturned() throws IOException {
+        when(request.getParameter("user_name")).thenReturn("user");
+        when(request.getParameter("user_pw")).thenReturn("123456");
+
+        server.serve(request, response);
+
+        assertThat(writer.toString()).isEqualTo("");
+    }
+
+}

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

@@ -11,5 +11,6 @@ This module contains articles about Java 8 core features
 - [Convert Between Byte Array and UUID in Java](https://www.baeldung.com/java-byte-array-to-uuid)
 - [Create a Simple “Rock-Paper-Scissors” Game in Java](https://www.baeldung.com/java-rock-paper-scissors)
 - [VarArgs vs Array Input Parameters in Java](https://www.baeldung.com/varargs-vs-array)
+- [Lambda Expression vs. Anonymous Inner Class](https://www.baeldung.com/java-lambdas-vs-anonymous-class)
 - [Java Helper vs. Utility Classes](https://www.baeldung.com/java-helper-vs-utility-classes)
 - [[<-- Prev]](/core-java-modules/core-java-8)

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

@@ -2,4 +2,5 @@
 
 - [Generating Random Dates in Java](https://www.baeldung.com/java-random-dates)
 - [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)
-- [[<-- Prev]](/core-java-modules/core-java-datetime-java8-1)
+- [Parsing Date Strings with Varying Formats](https://www.baeldung.com/java-parsing-dates-many-formats)
+- [[<-- Prev]](/core-java-modules/core-java-datetime-java8-1)

core-java-modules/core-java-9-jigsaw/README.md

@@ -8,5 +8,5 @@ This module contains articles about Project Jigsaw and the Java Platform Module
 - [A Guide to Java 9 Modularity](https://www.baeldung.com/java-9-modularity)
 - [Java 9 java.lang.Module API](https://www.baeldung.com/java-9-module-api)
 - [Java 9 Illegal Reflective Access Warning](https://www.baeldung.com/java-illegal-reflective-access)
-
+- [Java Modularity and Unit Testing](https://www.baeldung.com/java-modularity-unit-testing)
 

core-java-modules/core-java-arrays-operations-basic/src/main/java/com/baeldung/arrayindex/ArrayIndex.java

@@ -0,0 +1,28 @@
+package com.baeldung.arrayindex;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.IntStream;
+
+class ArrayIndex {
+    static int forLoop(int[] numbers, int target) {
+        for (int index = 0; index < numbers.length; index++) {
+            if (numbers[index] == target) {
+                return index;
+            }
+        }
+        return -1;
+    }
+
+    static int listIndexOf(Integer[] numbers, int target) {
+        List<Integer> list = Arrays.asList(numbers);
+        return list.indexOf(target);
+    }
+
+    static int intStream(int[] numbers, int target) {
+        return IntStream.range(0, numbers.length)
+          .filter(i -> numbers[i] == target)
+          .findFirst()
+          .orElse(-1);
+    }
+}

core-java-modules/core-java-arrays-operations-basic/src/test/java/com/baeldung/arrayindex/ArrayIndexUnitTest.java

@@ -0,0 +1,106 @@
+package com.baeldung.arrayindex;
+
+import static com.baeldung.arrayindex.ArrayIndex.forLoop;
+import static com.baeldung.arrayindex.ArrayIndex.intStream;
+import static com.baeldung.arrayindex.ArrayIndex.listIndexOf;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Arrays;
+
+import org.apache.commons.lang3.ArrayUtils;
+import org.junit.jupiter.api.Test;
+
+import com.google.common.primitives.Ints;
+
+class ArrayIndexUnitTest {
+
+    @Test
+    void givenIntegerArray_whenUseForLoop_thenWillGetElementIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(2, forLoop(numbers, 30));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseForLoop_thenWillGetElementMinusOneIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, forLoop(numbers, 100));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseIndexOf_thenWillGetElementIndex() {
+        Integer[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(2, listIndexOf(numbers, 30));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseIndexOf_thenWillGetElementMinusOneIndex() {
+        Integer[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, listIndexOf(numbers, 100));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseIntStream_thenWillGetElementIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(2, intStream(numbers, 30));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseIntStream_thenWillGetElementMinusOneIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, intStream(numbers, 100));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseBinarySearch_thenWillGetElementIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(2, Arrays.binarySearch(numbers, 30));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseBinarySearch_thenWillGetUpperBoundMinusIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-6, Arrays.binarySearch(numbers, 100));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseBinarySearch_thenWillGetInArrayMinusIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-2, Arrays.binarySearch(numbers, 15));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseBinarySearch_thenWillGetLowerBoundMinusIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, Arrays.binarySearch(numbers, -15));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseApacheCommons_thenWillGetElementIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(2, ArrayUtils.indexOf(numbers, 30));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseApacheCommonsStartingFromIndex_thenWillGetNegativeIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, ArrayUtils.indexOf(numbers, 30, 3));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseApacheCommons_thenWillGetElementMinusOneIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, ArrayUtils.indexOf(numbers, 100));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseGuavaInts_thenWillGetElementIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(2, Ints.indexOf(numbers, 30));
+    }
+
+    @Test
+    void givenIntegerArray_whenUseGuavaInts_thenWillGetElementMinusOneIndex() {
+        int[] numbers = { 10, 20, 30, 40, 50 };
+        assertEquals(-1, Ints.indexOf(numbers, 100));
+    }
+}

core-java-modules/core-java-char/src/test/java/com/baeldung/charandstring/DifferenceBetweenCharAndStringUnitTest.java

@@ -0,0 +1,56 @@
+package com.baeldung.charandstring;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+
+import org.junit.jupiter.api.Test;
+
+public class DifferenceBetweenCharAndStringUnitTest {
+
+    @Test
+    void whenPlusTwoChars_thenGetSumAsInteger() {
+        char h = 'H'; // the value is 72
+        char i = 'i'; // the value is 105
+        assertEquals(177, h + i);
+        assertInstanceOf(Integer.class, h + i);
+    }
+
+    @Test
+    void whenPlusTwoStrings_thenConcatenateThem() {
+        String i = "i";
+        String h = "H";
+        assertEquals("Hi", h + i);
+    }
+
+    @Test
+    void whenPlusCharsAndStrings_thenGetExpectedValues() {
+        char c = 'C';
+        assertEquals("C", "" + c);
+
+        char h = 'H'; // the value is 72
+        char i = 'i'; // the value is 105
+        assertEquals("Hi", "" + h + i);
+        assertEquals("Hi", h + "" + i);
+        assertEquals("177", h + i + "");
+    }
+
+    @Test
+    void whenStringChars_thenGetCharArray() {
+        char h = 'h';
+        char e = 'e';
+        char l = 'l';
+        char o = 'o';
+
+        String hello = "hello";
+        assertEquals(h, hello.charAt(0));
+        assertEquals(e, hello.charAt(1));
+        assertEquals(l, hello.charAt(2));
+        assertEquals(l, hello.charAt(3));
+        assertEquals(o, hello.charAt(4));
+
+        char[] chars = new char[] { h, e, l, l, o };
+        char[] charsFromString = hello.toCharArray();
+        assertArrayEquals(chars, charsFromString);
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/completablefuture/NonBlockingExample.java

@@ -0,0 +1,17 @@
+package com.baeldung.concurrent.completablefuture;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.CompletableFuture;
+
+public class NonBlockingExample {
+
+    private static final Logger logger = LoggerFactory.getLogger(NonBlockingExample.class);
+
+    public static void main(String[] args) {
+        CompletableFuture.supplyAsync(() -> "Baeldung")
+          .thenApply(String::length)
+          .thenAccept(s -> logger.info(String.valueOf(s)));
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/test/java/com/baeldung/concurrent/completablefuture/BlockingUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.concurrent.completablefuture;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class BlockingUnitTest {
+
+    @Test
+    void givenCompletableFuture_whenGet_thenReturnResult()
+      throws ExecutionException, InterruptedException {
+        CompletableFuture<String> completableFuture = CompletableFuture
+          .supplyAsync(() -> "Baeldung")
+          .thenApply(String::toUpperCase);
+
+        assertEquals("BAELDUNG", completableFuture.get());
+    }
+
+    @Test
+    void givenCompletableFuture_whenJoin_thenReturnResult() {
+        CompletableFuture<String> completableFuture = CompletableFuture
+          .supplyAsync(() -> "Blocking")
+          .thenApply(s -> s + " Operation")
+          .thenApply(String::toLowerCase);
+
+        assertEquals("blocking operation", completableFuture.join());
+    }
+}

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

@@ -5,3 +5,5 @@ This module contains articles about core Java input/output(IO) APIs.
 ### Relevant Articles:
 - [Constructing a Relative Path From Two Absolute Paths in Java](https://www.baeldung.com/java-relative-path-absolute)
 - [Java Scanner Taking a Character Input](https://www.baeldung.com/java-scanner-character-input)
+- [Get the Desktop Path in Java](https://www.baeldung.com/java-desktop-path)
+- [Integer.parseInt(scanner.nextLine()) and scanner.nextInt() in Java](https://www.baeldung.com/java-scanner-integer)

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/bufferedreadervsfilereader/BufferedReaderUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.bufferedreadervsfilereader;
+
+import org.junit.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class BufferedReaderUnitTest {
+
+    @Test
+    public void whenReadingAFile_thenReadsLineByLine() {
+        StringBuilder result = new StringBuilder();
+
+        try (BufferedReader br = new BufferedReader(new FileReader("src/test/resources/sampleText1.txt"))) {
+            String line;
+
+            while((line = br.readLine()) != null) {
+                result.append(line);
+                result.append('\n');
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        assertEquals("first line\nsecond line\nthird line\n", result.toString());
+    }
+
+}

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/bufferedreadervsfilereader/FileReaderUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.bufferedreadervsfilereader;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.FileReader;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class FileReaderUnitTest {
+
+    @Test
+    public void whenReadingAFile_thenReadsCharByChar() {
+        StringBuilder result = new StringBuilder();
+
+        try (FileReader fr = new FileReader("src/test/resources/sampleText2.txt")) {
+            int i = fr.read();
+
+            while(i != -1) {
+                result.append((char)i);
+
+                i = fr.read();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        assertEquals("qwerty", result.toString());
+    }
+}

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/scanner/NextLineVsNextIntUnitTest.java

@@ -0,0 +1,85 @@
+package com.baeldung.scanner;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+import org.junit.jupiter.api.Test;
+
+public class NextLineVsNextIntUnitTest {
+
+    @Test
+    void whenInputLineIsNumber_thenNextLineAndNextIntBothWork() {
+        String input = "42\n";
+
+        //nextLine()
+        Scanner sc1 = new Scanner(input);
+        int num1 = Integer.parseInt(sc1.nextLine());
+        assertEquals(42, num1);
+
+        //nextInt()
+        Scanner sc2 = new Scanner(input);
+        int num2 = sc2.nextInt();
+        assertEquals(42, num2);
+
+    }
+
+    @Test
+    void whenInputIsNotValidNumber_thenNextLineAndNextIntThrowDifferentException() {
+        String input = "Nan\n";
+
+        //nextLine() -> NumberFormatException
+        Scanner sc1 = new Scanner(input);
+        assertThrows(NumberFormatException.class, () -> Integer.parseInt(sc1.nextLine()));
+
+        //nextInt() -> InputMismatchException
+        Scanner sc2 = new Scanner(input);
+        assertThrows(InputMismatchException.class, sc2::nextInt);
+    }
+
+    @Test
+    void whenUsingNextInt_thenTheNextTokenAfterItFailsToParseIsNotConsumed() {
+        String input = "42 is a magic number\n";
+
+        //nextInt() to read '42'
+        Scanner sc2 = new Scanner(input);
+        int num2 = sc2.nextInt();
+        assertEquals(42, num2);
+
+        // call nextInt() again on "is"
+        assertThrows(InputMismatchException.class, sc2::nextInt);
+
+        String theNextToken = sc2.next();
+        assertEquals("is", theNextToken);
+
+        theNextToken = sc2.next();
+        assertEquals("a", theNextToken);
+    }
+
+    @Test
+    void whenReadingTwoInputLines_thenNextLineAndNextIntBehaveDifferently() {
+
+        String input = new StringBuilder().append("42\n")
+          .append("It is a magic number.\n")
+          .toString();
+
+        //nextLine()
+        Scanner sc1 = new Scanner(input);
+        int num1 = Integer.parseInt(sc1.nextLine());
+        String nextLineText1 = sc1.nextLine();
+        assertEquals(42, num1);
+        assertEquals("It is a magic number.", nextLineText1);
+
+        //nextInt()
+        Scanner sc2 = new Scanner(input);
+        int num2 = sc2.nextInt();
+        assertEquals(42, num2);
+
+        // nextInt() leaves the newline character (\n) behind
+        String nextLineText2 = sc2.nextLine();
+        assertEquals("", nextLineText2);
+    }
+
+}

core-java-modules/core-java-io-apis-2/src/test/resources/sampleText1.txt

@@ -0,0 +1,3 @@
+first line
+second line
+third line

core-java-modules/core-java-io-apis-2/src/test/resources/sampleText2.txt

@@ -0,0 +1 @@
+qwerty

core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/inputstreamtostring/JavaInputStreamToXUnitTest.java

@@ -49,7 +49,7 @@ public class JavaInputStreamToXUnitTest {
         final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
 
         final StringBuilder textBuilder = new StringBuilder();
-        try (Reader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName(StandardCharsets.UTF_8.name())))) {
+        try (Reader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
             int c;
             while ((c = reader.read()) != -1) {
                 textBuilder.append((char) c);
@@ -63,7 +63,7 @@ public class JavaInputStreamToXUnitTest {
         final String originalString = randomAlphabetic(DEFAULT_SIZE);
         final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
 
-        final String text = new BufferedReader(new InputStreamReader(inputStream, Charset.forName(StandardCharsets.UTF_8.name())))
+        final String text = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))
           .lines()
           .collect(Collectors.joining("\n"));
 

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

@@ -10,4 +10,3 @@
 - [Serialize a Lambda in Java](https://www.baeldung.com/java-serialize-lambda)
 - [Convert Anonymous Class into Lambda in Java](https://www.baeldung.com/java-from-anonymous-class-to-lambda)
 - [When to Use Callable and Supplier in Java](https://www.baeldung.com/java-callable-vs-supplier)
-- [Lambda Expression vs. Anonymous Inner Class](https://www.baeldung.com/java-lambdas-vs-anonymous-class)

core-java-modules/core-java-lang-math-3/README.md

@@ -10,4 +10,5 @@
 - [Create a BMI Calculator in Java](https://www.baeldung.com/java-body-mass-index-calculator)
 - [Java Program to Calculate the Standard Deviation](https://www.baeldung.com/java-calculate-standard-deviation)
 - [Java Program to Print Pascal’s Triangle](https://www.baeldung.com/java-pascal-triangle)
+- [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
 - More articles: [[<-- Prev]](/core-java-modules/core-java-lang-math-2)

core-java-modules/core-java-lang-math-3/pom.xml

@@ -23,11 +23,17 @@
             <artifactId>javaluator</artifactId>
             <version>${javaluator.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.javamoney</groupId>
+            <artifactId>moneta</artifactId>
+            <version>${javamoney.moneta.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
         <exp4j.version>0.4.8</exp4j.version>
         <javaluator.version>3.0.3</javaluator.version>
+        <javamoney.moneta.version>1.1</javamoney.moneta.version>
     </properties>
 
 </project>

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

@@ -0,0 +1,7 @@
+## Core Java Lang OOP - Constructors - Part 2
+
+This module contains article about constructors in Java
+
+### Relevant Articles:
+- [Different Ways to Create an Object in Java](https://www.baeldung.com/java-different-ways-to-create-objects)
+- More articles: [[<-- Prev]](/core-java-modules/core-java-lang-oop-constructors)

core-java-modules/core-java-lang-oop-constructors-2/pom.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-lang-oop-constructors-2</artifactId>
+    <name>core-java-lang-oop-constructors-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+</project>

core-java-modules/core-java-lang-oop-constructors/README.md

@@ -13,4 +13,4 @@ This module contains article about constructors in Java
 - [Constructor Specification in Java](https://www.baeldung.com/java-constructor-specification)
 - [Static vs. Instance Initializer Block in Java](https://www.baeldung.com/java-static-instance-initializer-blocks)
 - [Accessing Private Constructor in Java](https://www.baeldung.com/java-private-constructor-access)
-- [Different Ways to Create an Object in Java](https://www.baeldung.com/java-different-ways-to-create-objects)
+- More articles: [[next -->]](/core-java-modules/core-java-lang-oop-constructors-2)

core-java-modules/core-java-lang-oop-methods/README.md

@@ -11,3 +11,4 @@ This module contains articles about methods in Java
 - [The Covariant Return Type in Java](https://www.baeldung.com/java-covariant-return-type)
 - [Does a Method’s Signature Include the Return Type in Java?](https://www.baeldung.com/java-method-signature-return-type)
 - [Solving the Hide Utility Class Public Constructor Sonar Warning](https://www.baeldung.com/java-sonar-hide-implicit-constructor)
+- [Best Practices for Passing Many Arguments to a Method in Java](https://www.baeldung.com/java-best-practices-many-parameters-method)

core-java-modules/core-java-lang-oop-methods/src/main/java/com/baeldung/methods/Car.java

@@ -0,0 +1,98 @@
+package com.baeldung.methods;
+
+public class Car {
+
+    private final String make;
+    private final String model;
+    private final int year;
+    private final String color;
+    private final boolean automatic;
+    private final int numDoors;
+    private final String features;
+
+    private Car(CarBuilder carBuilder) {
+        this.make = carBuilder.make;
+        this.model = carBuilder.model;
+        this.year = carBuilder.year;
+        this.color = carBuilder.color;
+        this.automatic = carBuilder.automatic;
+        this.numDoors = carBuilder.numDoors;
+        this.features = carBuilder.features;
+    }
+
+    public String getMake() {
+        return make;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public boolean isAutomatic() {
+        return automatic;
+    }
+
+    public int getNumDoors() {
+        return numDoors;
+    }
+
+    public String getFeatures() {
+        return features;
+    }
+
+    public static class CarBuilder {
+
+        private final String make;
+        private final String model;
+        private final int year;
+
+        private String color = "unknown";
+        private boolean automatic = false;
+        private int numDoors = 4;
+        private String features = "";
+
+        public CarBuilder(String make, String model, int year) {
+            this.make = make;
+            this.model = model;
+            this.year = year;
+        }
+
+        public CarBuilder color(String color) {
+            this.color = color;
+            return this;
+        }
+
+        public CarBuilder automatic(boolean automatic) {
+            this.automatic = automatic;
+            return this;
+        }
+
+        public CarBuilder numDoors(int numDoors) {
+            this.numDoors = numDoors;
+            return this;
+        }
+
+        public CarBuilder features(String features) {
+            this.features = features;
+            return this;
+        }
+
+        public Car build() {
+            return new Car(this);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "Car [make=" + make + ", model=" + model + ", year=" + year + ", color=" + color + ", automatic=" + automatic + ", numDoors=" + numDoors + ", features=" + features + "]";
+    }
+
+}

core-java-modules/core-java-lang-oop-methods/src/main/java/com/baeldung/methods/Motorcycle.java

@@ -0,0 +1,52 @@
+package com.baeldung.methods;
+
+import java.io.Serializable;
+
+public class Motorcycle extends Vehicle implements Serializable {
+
+    private static final long serialVersionUID = 5973661295933599929L;
+
+    private int year;
+    private String features = "";
+
+    public Motorcycle() {
+        super();
+    }
+
+    public Motorcycle(String make, String model, String color, int weight, boolean statusNew, int year) {
+        super(make, model, color, weight, statusNew);
+        this.year = year;
+    }
+
+    public Motorcycle(Vehicle vehicle, int year) {
+        super(vehicle);
+        this.year = year;
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public void setYear(int year) {
+        this.year = year;
+    }
+
+    public void setFeatures(String features) {
+        this.features = features;
+    }
+
+    public String getFeatures() {
+        return features;
+    }
+
+    public void addMotorcycleFeatures(String... features) {
+        StringBuilder str = new StringBuilder(this.getFeatures());
+        for (String feature : features) {
+            if (!str.toString().isEmpty())
+                str.append(", ");
+            str.append(feature);
+        }
+        this.setFeatures(str.toString());
+    }
+
+}

core-java-modules/core-java-lang-oop-methods/src/main/java/com/baeldung/methods/Vehicle.java

@@ -0,0 +1,33 @@
+package com.baeldung.methods;
+
+public class Vehicle {
+
+    static String defaultValue = "DEFAULT";
+    private String make = defaultValue;
+    private String model = defaultValue;
+    private String color = defaultValue;
+    private int weight = 0;
+    private boolean statusNew = true;
+
+    public Vehicle() {
+        super();
+    }
+
+    public Vehicle(String make, String model, String color, int weight, boolean statusNew) {
+        this.make = make;
+        this.model = model;
+        this.color = color;
+        this.weight = weight;
+        this.statusNew = statusNew;
+    }
+
+    public Vehicle(Vehicle vehicle) {
+        this(vehicle.make, vehicle.model, vehicle.color, vehicle.weight, vehicle.statusNew);
+    }
+
+    @Override
+    public String toString() {
+        return "Vehicle [make=" + make + ", model=" + model + ", color=" + color + ", weight=" + weight + ", statusNew=" + statusNew + "]";
+    }
+
+}

core-java-modules/core-java-lang-oop-methods/src/main/java/com/baeldung/methods/VehicleProcessor.java

@@ -0,0 +1,20 @@
+package com.baeldung.methods;
+
+public class VehicleProcessor {
+
+    Vehicle processVehicle(String make, String model, String color, int weight, boolean status) {
+        return new Vehicle(make, model, color, weight, status);
+    }
+
+    Vehicle processVehicle(Vehicle vehicle) {
+        return new Vehicle(vehicle);
+    }
+
+    Car processCar(Car car) {
+        return new Car.CarBuilder(car.getMake(), car.getModel(), car.getYear()).color(car.getColor())
+            .automatic(car.isAutomatic())
+            .features(car.getFeatures())
+            .build();
+    }
+
+}

core-java-modules/core-java-lang-oop-methods/src/test/java/com/baeldung/methods/VehicleProcessorUnitTest.java

@@ -0,0 +1,58 @@
+package com.baeldung.methods;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class VehicleProcessorUnitTest {
+
+    VehicleProcessor vehicleProcessor = new VehicleProcessor();
+    Vehicle vehicle = new Vehicle("Ford", "Focus", "red", 2200, true);
+
+    @Test
+    void givenAllArguments_whenMethodCall_thenVerifyCallIsDoneCorrectly() {
+        Vehicle veh = vehicleProcessor.processVehicle("Ford", "Focus", "red", 2200, true);
+        assertThat(veh.toString()).hasToString(vehicle.toString());
+    }
+
+    @Test
+    void givenParameterObject_whenMethodCall_thenVerifyCallIsDoneCorrectly() {
+        Vehicle veh = vehicleProcessor.processVehicle(vehicle);
+        assertThat(veh.toString()).hasToString(vehicle.toString());
+    }
+
+    @Test
+    void givenJavaBeanPattern_whenMethodCall_thenVerifyCallIsDoneCorrectly() {
+        Motorcycle motorcycle = new Motorcycle("Ducati", "Monster", "yellow", 235, true, 2023);
+        motorcycle.setFeatures("GPS");
+
+        vehicleProcessor.processVehicle(motorcycle);
+        assertThat(motorcycle.getFeatures()).isEqualToIgnoringCase("GPS");
+    }
+
+    @Test
+    void givenJavaVarargs_whenMethodCall_thenAssertTheReturnedConcatenatedString() {
+        Motorcycle motorcycle = new Motorcycle("Ducati", "Monster", "red", 350, true, 2023);
+        motorcycle.addMotorcycleFeatures("abs");
+        assertThat(motorcycle.getFeatures()).isEqualToIgnoringCase("abs");
+
+        motorcycle.addMotorcycleFeatures("navi", "charger");
+        assertThat(motorcycle.getFeatures()).isEqualToIgnoringCase("abs, navi, charger");
+
+        motorcycle.addMotorcycleFeatures("wifi", "phone", "satellite");
+        assertThat(motorcycle.getFeatures()).isEqualToIgnoringCase("abs, navi, charger, wifi, phone, satellite");
+    }
+
+    @Test
+    void givenJavaBuilderPattern_whenMethodCall_thenVerifyCallIsDoneCorrectly() {
+        Car car = new Car.CarBuilder("Ford", "Focus", 2023).color("blue")
+            .automatic(true)
+            .features("abs, navi, charger, wifi, phone, satellite")
+            .build();
+
+        Car result = vehicleProcessor.processCar(car);
+
+        assertThat(result.toString()).hasToString(car.toString());
+    }
+
+}

core-java-modules/core-java-networking-4/README.md

@@ -3,3 +3,4 @@
 - [Validating URL in Java](https://www.baeldung.com/java-validate-url)
 - [Validating IPv4 Address in Java](https://www.baeldung.com/java-validate-ipv4-address)
 - [Download a Webpage in Java](https://www.baeldung.com/java-download-webpage)
+- [URL Query Manipulation in Java](https://www.baeldung.com/java-url-query-manipulation)

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

@@ -1,7 +1,7 @@
 <?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">
+         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-networking</artifactId>
     <name>core-java-networking</name>
@@ -19,6 +19,11 @@
             <artifactId>spring-web</artifactId>
             <version>${springframework.spring-web.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpclient</artifactId>
+            <version>${apache.httpclient.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -27,6 +32,7 @@
 
     <properties>
         <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
+        <apache.httpclient.version>4.5.14</apache.httpclient.version>
     </properties>
 
 </project>

core-java-modules/core-java-networking/src/test/java/com/baeldung/networking/url/UrlUnitTest.java

@@ -1,11 +1,19 @@
 package com.baeldung.networking.url;
 
+import static java.util.stream.Collectors.toList;
 import static org.junit.Assert.assertEquals;
 
 import java.net.MalformedURLException;
+import java.net.URISyntaxException;
 import java.net.URL;
+import java.util.Map;
 
+import org.apache.http.client.utils.URIBuilder;
+import org.apache.http.message.BasicNameValuePair;
 import org.junit.Test;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import com.google.common.collect.ImmutableMap;
 
 public class UrlUnitTest {
 
@@ -101,4 +109,44 @@ public class UrlUnitTest {
         assertEquals("http://baeldung.com:9000/guidelines.txt", url.toString());
     }
 
-}
+    @Test
+    public void givenUrlParameters_whenBuildUrlWithURIBuilder_thenSuccess() throws URISyntaxException, MalformedURLException {
+        URIBuilder uriBuilder = new URIBuilder("http://baeldung.com/articles");
+        uriBuilder.setPort(9090);
+        uriBuilder.addParameter("topic", "java");
+        uriBuilder.addParameter("version", "8");
+        URL url = uriBuilder.build().toURL();
+        assertEquals("http://baeldung.com:9090/articles?topic=java&version=8", url.toString());
+    }
+
+    @Test
+    public void givenUrlParametersInMap_whenBuildUrlWithURIBuilder_thenSuccess() throws URISyntaxException, MalformedURLException {
+        Map<String, String> paramMap = ImmutableMap.of("topic", "java", "version", "8");
+        URIBuilder uriBuilder = new URIBuilder("http://baeldung.com/articles");
+        uriBuilder.setPort(9090);
+        uriBuilder.addParameters(paramMap.entrySet()
+          .stream()
+          .map(entry -> new BasicNameValuePair(entry.getKey(), entry.getValue()))
+          .collect(toList()));
+
+        URL url = uriBuilder.build().toURL();
+        assertEquals("http://baeldung.com:9090/articles?topic=java&version=8", url.toString());
+    }
+
+    @Test
+    public void givenUrlParameters_whenBuildUrlWithSpringUriComponentsBuilder_thenSuccess() throws MalformedURLException {
+        URL url = UriComponentsBuilder.newInstance()
+          .scheme("http")
+          .host("baeldung.com")
+          .port(9090)
+          .path("articles")
+          .queryParam("topic", "java")
+          .queryParam("version", "8")
+          .build()
+          .toUri()
+          .toURL();
+
+        assertEquals("http://baeldung.com:9090/articles?topic=java&version=8", url.toString());
+    }
+
+}

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

@@ -14,5 +14,4 @@ This module contains articles about core Java non-blocking input and output (IO)
 - [What Is the Difference Between NIO and NIO.2?](https://www.baeldung.com/java-nio-vs-nio-2)
 - [Guide to ByteBuffer](https://www.baeldung.com/java-bytebuffer)
 - [Find Files that Match Wildcard Strings in Java](https://www.baeldung.com/java-files-match-wildcard-strings)
-- [Get the Desktop Path in Java](https://www.baeldung.com/java-desktop-path)
 - [[<-- Prev]](/core-java-modules/core-java-nio)

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

@@ -1,4 +1,4 @@
 ### Relevant Articles:
 - [Java Program to Calculate Pi](https://www.baeldung.com/java-monte-carlo-compute-pi)
-
-- More articles: [[<-- prev]](../core-java-numbers-5)
+- [Convert Integer to Hexadecimal in Java](https://www.baeldung.com/java-convert-int-to-hex)
+- More articles: [[<-- prev]](../core-java-numbers-5)

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

@@ -13,3 +13,4 @@ This module contains articles about performance of Java applications
 - [Capturing a Java Thread Dump](https://www.baeldung.com/java-thread-dump)
 - [JMX Ports](https://www.baeldung.com/jmx-ports)
 - [Calling JMX MBean Method From a Shell Script](https://www.baeldung.com/jmx-mbean-shell-access)
+- [External Debugging With JMXTerm](https://www.baeldung.com/java-jmxterm-external-debugging)

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

@@ -5,4 +5,5 @@
 - [Converting Camel Case and Title Case to Words in Java](https://www.baeldung.com/java-camel-case-title-case-to-words)
 - [How to Use Regular Expressions to Replace Tokens in Strings in Java](https://www.baeldung.com/java-regex-token-replacement)
 - [Creating a Java Array from Regular Expression Matches](https://www.baeldung.com/java-array-regex-matches)
+- [Getting the Text That Follows After the Regex Match in Java](https://www.baeldung.com/java-regex-text-after-match)
 - More articles: [[<-- prev]](/core-java-modules/core-java-regex)

core-java-modules/core-java-regex-2/src/test/java/com/baeldung/regex/aftermatch/GetTextAfterTheRegexMatchUnitTest.java

@@ -0,0 +1,83 @@
+package com.baeldung.regex.aftermatch;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class GetTextAfterTheRegexMatchUnitTest {
+    private static final String INPUT1 = "Some text, targetValue=Regex is cool";
+    private static final String INPUT2 = "Some text. targetValue=Java is cool. some other text";
+
+    @Test
+    void whenUsingSplit_thenGetExpectedString() {
+        String result1 = INPUT1.split("targetValue=")[1];
+        assertEquals("Regex is cool", result1);
+
+        String afterFirstSplit = INPUT2.split("targetValue=")[1];
+        assertEquals("Java is cool. some other text", afterFirstSplit);
+        String result2 = afterFirstSplit.split("[.]")[0];
+        assertEquals("Java is cool", result2);
+
+        // if use the dot as the regex for splitting, the result array is empty
+        String[] splitByDot = INPUT2.split("targetValue=")[1].split(".");
+        assertEquals(0, splitByDot.length);
+    }
+
+    @Test
+    void whenUsingReplaceAll_thenGetExpectedString() {
+        String result1 = INPUT1.replaceAll(".*targetValue=", "");
+        assertEquals("Regex is cool", result1);
+
+        String afterFirstReplace = INPUT2.replaceAll(".*targetValue=", "");
+        assertEquals("Java is cool. some other text", afterFirstReplace);
+        String result2 = afterFirstReplace.replaceAll("[.].*", "");
+        assertEquals("Java is cool", result2);
+
+    }
+
+    @Test
+    void whenUsingRegexGrouping_thenGetExpectedString() {
+        Pattern p1 = Pattern.compile("targetValue=(.*)");
+        Matcher m1 = p1.matcher(INPUT1);
+        assertTrue(m1.find());
+        String result1 = m1.group(1);
+        assertEquals("Regex is cool", result1);
+
+        Pattern p2 = Pattern.compile("targetValue=([^.]*)");
+        Matcher m2 = p2.matcher(INPUT2);
+        assertTrue(m2.find());
+        String result2 = m2.group(1);
+        assertEquals("Java is cool", result2);
+
+        Pattern p3 = Pattern.compile("targetValue=(.*?)[.]");
+        Matcher m3 = p3.matcher(INPUT2);
+        assertTrue(m3.find());
+        String result3 = m3.group(1);
+        assertEquals("Java is cool", result3);
+    }
+
+    @Test
+    void whenUsingLookaround_thenGetExpectedString() {
+        Pattern p1 = Pattern.compile("(?<=targetValue=).*");
+        Matcher m1 = p1.matcher(INPUT1);
+        assertTrue(m1.find());
+        String result1 = m1.group();
+        assertEquals("Regex is cool", result1);
+
+        Pattern p2 = Pattern.compile("(?<=targetValue=)[^.]*");
+        Matcher m2 = p2.matcher(INPUT2);
+        assertTrue(m2.find());
+        String result2 = m2.group();
+        assertEquals("Java is cool", result2);
+
+        Pattern p3 = Pattern.compile("(?<=targetValue=).*(?=[.])");
+        Matcher m3 = p3.matcher(INPUT2);
+        assertTrue(m3.find());
+        String result3 = m3.group();
+        assertEquals("Java is cool", result3);
+    }
+}

core-java-modules/core-java-streams-3/src/test/java/com/baeldung/streams/flatmap/map/Java8MapAndFlatMapUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java8;
+package com.baeldung.streams.flatmap.map;
 
 import org.junit.Test;
 
@@ -12,7 +12,7 @@ import java.util.stream.Stream;
 import static java.util.Arrays.asList;
 import static org.junit.Assert.assertEquals;
 
-public class Java8MapAndFlatMap {
+public class Java8MapAndFlatMapUnitTest {
 
     @Test
     public void givenStream_whenCalledMap_thenProduceList() {

core-java-modules/core-java-streams-4/README.md

@@ -10,4 +10,3 @@
 - [Understanding the Difference Between Stream.of() and IntStream.range()](https://www.baeldung.com/java-stream-of-and-intstream-range)
 - [Check if Object Is an Array in Java](https://www.baeldung.com/java-check-if-object-is-an-array)
 - [Mapping an Array of Integers to Strings Using Java Streams](https://www.baeldung.com/java-stream-integer-array-to-strings)
-- [Difference Between parallelStream() and stream().parallel() in Java](https://www.baeldung.com/java-parallelstream-vs-stream-parallel)

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

@@ -0,0 +1 @@
+- [Difference Between parallelStream() and stream().parallel() in Java](https://www.baeldung.com/java-parallelstream-vs-stream-parallel)

core-java-modules/core-java-streams-5/pom.xml

@@ -0,0 +1,72 @@
+<?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-streams-5</artifactId>
+    <name>core-java-streams-5</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit</groupId>
+            <artifactId>junit-bom</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <type>pom</type>
+            <scope>import</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.23.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.12.0</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-streams-4</finalName>
+        <resources>
+            <resource>
+                <directory>../core-java-streams-4/src/main</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                    <compilerArgument>-parameters</compilerArgument>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <!-- testing -->
+        <maven-compiler-plugin.version>3.1</maven-compiler-plugin.version>
+        <maven.compiler.source>12</maven.compiler.source>
+        <maven.compiler.target>12</maven.compiler.target>
+    </properties>
+
+</project>

core-java-modules/core-java-streams-5/src/main/java/com/baeldung/streams/parallelstream/Book.java

@@ -34,4 +34,4 @@ public class Book {
     public void setYearPublished(int yearPublished) {
         this.yearPublished = yearPublished;
     }
-}
+}

core-java-modules/core-java-streams-5/src/main/java/com/baeldung/streams/parallelstream/BookSpliterator.java

@@ -37,4 +37,4 @@ public class BookSpliterator<T> implements Spliterator<T> {
     public int characteristics() {
         return CONCURRENT;
     }
-}
+}

core-java-modules/core-java-streams-5/src/main/java/com/baeldung/streams/parallelstream/MyBookContainer.java

@@ -90,4 +90,4 @@ public class MyBookContainer<T> implements Collection<T> {
     public void clear() {
 
     }
-}
+}

core-java-modules/core-java-streams-5/src/main/java/com/baeldung/streams/parallelstream/ParallelStreamApplication.java

@@ -38,4 +38,4 @@ public class ParallelStreamApplication {
           });
         return countOfBooks.get();
     }
-}
+}

core-java-modules/core-java-streams-5/src/test/java/com/baeldung/parallelstream/ParallelStreamUnitTest.java

@@ -1,6 +1,5 @@
-package parallelstream;
+package com.baeldung.parallelstream;
 
-import java.util.ArrayList;
 import java.util.List;
 
 import org.junit.Assert;

core-java-modules/core-java-string-algorithms-3/README.md

@@ -10,3 +10,4 @@ This module contains articles about string-related algorithms.
 - [Check if the First Letter of a String is Uppercase](https://www.baeldung.com/java-check-first-letter-uppercase)
 - [Find the First Non Repeating Character in a String in Java](https://www.baeldung.com/java-find-the-first-non-repeating-character)
 - [Find the First Embedded Occurrence of an Integer in a Java String](https://www.baeldung.com/java-string-find-embedded-integer)
+- [Find the Most Frequent Characters in a String](https://www.baeldung.com/java-string-find-most-frequent-characters)

core-java-modules/core-java-string-algorithms-3/pom.xml

@@ -39,8 +39,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
                     <compilerArgument>-parameters</compilerArgument>
                 </configuration>
             </plugin>

core-java-modules/core-java-string-algorithms-3/src/main/java/com/baeldung/charfreq/CharacterWithHighestFrequency.java

@@ -0,0 +1,58 @@
+package com.baeldung.charfreq;
+
+import static java.util.Map.Entry.comparingByValue;
+import static java.util.stream.Collectors.counting;
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.toSet;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class CharacterWithHighestFrequency {
+    public static Character byStream(String input) {
+        return input.chars()
+          .mapToObj(x -> (char) x)
+          .collect(groupingBy(x -> x, counting()))
+          .entrySet()
+          .stream()
+          .max(comparingByValue())
+          .get()
+          .getKey();
+    }
+
+    public static Set<Character> byMap(String input) {
+        Map<Character, Integer> map = new HashMap<>();
+        for (char c : input.toCharArray()) {
+            map.compute(c, (character, count) -> count == null ? 1 : ++count);
+        }
+        int maxCount = map.values()
+          .stream()
+          .mapToInt(Integer::intValue)
+          .max()
+          .getAsInt();
+
+        return map.keySet()
+          .stream()
+          .filter(c -> map.get(c) == maxCount)
+          .collect(toSet());
+    }
+
+    public static Set<Character> byBucket(String input) {
+        int[] buckets = new int[128];
+
+        int maxCount = 0;
+        for (char c : input.toCharArray()) {
+            buckets[c]++;
+            maxCount = Math.max(buckets[c], maxCount);
+        }
+
+        int finalMaxCount = maxCount;
+        return IntStream.range(0, 128)
+          .filter(c -> buckets[c] == finalMaxCount)
+          .mapToObj(i -> (char) i)
+          .collect(Collectors.toSet());
+    }
+}

core-java-modules/core-java-string-algorithms-3/src/test/java/com/baeldung/charfreq/CharacterWithHighestFrequencyUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.charfreq;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Collections;
+import java.util.Set;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.ImmutableSet;
+
+class CharacterWithHighestFrequencyUnitTest {
+    private static final String INPUT1 = "aaaaaaaaaa(10) bbbbbbb ccccc dddd eee ff";
+    private static final Set<Character> EXPECTED1 = Collections.singleton('a');
+
+    private static final String INPUT2 = "YYYYYYY(7) bbbbb -------(7) dddd eee kkkkkkk(7) ff";
+    private static final Set<Character> EXPECTED2 = ImmutableSet.of('Y', '-', 'k');
+
+    @Test
+    void whenGettingSingleCharWithHighestFrequencyByStream_shouldSuccess() {
+        char result1 = CharacterWithHighestFrequency.byStream(INPUT1);
+        assertEquals('a', result1);
+    }
+
+    @Test
+    void whenGettingCharWithHighestFrequencyByMap_shouldSuccess() {
+        Set<Character> result1 = CharacterWithHighestFrequency.byMap(INPUT1);
+        assertEquals(EXPECTED1, result1);
+
+        Set<Character> result2 = CharacterWithHighestFrequency.byMap(INPUT2);
+        assertEquals(EXPECTED2, result2);
+
+    }
+
+    @Test
+    void whenGettingCharWithHighestFrequencyByBucket_shouldSuccess() {
+        Set<Character> result1 = CharacterWithHighestFrequency.byBucket(INPUT1);
+        assertEquals(EXPECTED1, result1);
+
+        Set<Character> result2 = CharacterWithHighestFrequency.byBucket(INPUT2);
+        assertEquals(EXPECTED2, result2);
+    }
+}

core-java-modules/core-java-string-algorithms/src/main/java/com/baeldung/reverse/ReverseStringExamples.java

@@ -1,5 +1,9 @@
 package com.baeldung.reverse;
 
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
 import org.apache.commons.lang3.StringUtils;
 
 public class ReverseStringExamples {
@@ -46,11 +50,43 @@ public class ReverseStringExamples {
         }
 
         return output.toString()
-            .trim();
+          .trim();
     }
 
     public static String reverseTheOrderOfWordsUsingApacheCommons(String sentence) {
         return StringUtils.reverseDelimited(sentence, ' ');
     }
 
+    public static String reverseUsingIntStreamRangeMethod(String str) {
+        if (str == null) {
+            return null;
+        }
+
+        char[] charArray = str.toCharArray();
+        return IntStream.range(0, str.length())
+          .mapToObj(i -> charArray[str.length() - i - 1])
+          .collect(StringBuilder::new, StringBuilder::append, StringBuilder::append)
+          .toString();
+    }
+
+    public static String reverseUsingStreamOfMethod(String str) {
+        if (str == null) {
+            return null;
+        }
+
+        return Stream.of(str)
+          .map(string -> new StringBuilder(string).reverse())
+          .collect(Collectors.joining());
+    }
+
+    public static String reverseUsingCharsMethod(String str) {
+        if (str == null) {
+            return null;
+        }
+
+        return str.chars()
+          .mapToObj(c -> (char) c)
+          .reduce("", (a, b) -> b + a, (a2, b2) -> b2 + a2);
+    }
+
 }

core-java-modules/core-java-string-algorithms/src/test/java/com/baeldung/reverse/ReverseStringExamplesUnitTest.java

@@ -1,10 +1,11 @@
 package com.baeldung.reverse;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 
-import static org.junit.Assert.assertEquals;
-
 public class ReverseStringExamplesUnitTest {
 
     private static final String STRING_INPUT = "cat";
@@ -19,7 +20,7 @@ public class ReverseStringExamplesUnitTest {
         String reversedEmpty = ReverseStringExamples.reverse(StringUtils.EMPTY);
 
         assertEquals(STRING_INPUT_REVERSED, reversed);
-        assertEquals(null, reversedNull);
+        assertNull(reversedNull);
         assertEquals(StringUtils.EMPTY, reversedEmpty);
     }
 
@@ -30,7 +31,7 @@ public class ReverseStringExamplesUnitTest {
         String reversedEmpty = ReverseStringExamples.reverseUsingStringBuilder(StringUtils.EMPTY);
 
         assertEquals(STRING_INPUT_REVERSED, reversed);
-        assertEquals(null, reversedNull);
+        assertNull(reversedNull);
         assertEquals(StringUtils.EMPTY, reversedEmpty);
     }
 
@@ -41,7 +42,7 @@ public class ReverseStringExamplesUnitTest {
         String reversedEmpty = ReverseStringExamples.reverseUsingApacheCommons(StringUtils.EMPTY);
 
         assertEquals(STRING_INPUT_REVERSED, reversed);
-        assertEquals(null, reversedNull);
+        assertNull(reversedNull);
         assertEquals(StringUtils.EMPTY, reversedEmpty);
     }
 
@@ -52,7 +53,7 @@ public class ReverseStringExamplesUnitTest {
         String reversedEmpty = ReverseStringExamples.reverseTheOrderOfWords(StringUtils.EMPTY);
 
         assertEquals(REVERSED_WORDS_SENTENCE, reversed);
-        assertEquals(null, reversedNull);
+        assertNull(reversedNull);
         assertEquals(StringUtils.EMPTY, reversedEmpty);
     }
 
@@ -63,7 +64,40 @@ public class ReverseStringExamplesUnitTest {
         String reversedEmpty = ReverseStringExamples.reverseTheOrderOfWordsUsingApacheCommons(StringUtils.EMPTY);
 
         assertEquals(REVERSED_WORDS_SENTENCE, reversed);
-        assertEquals(null, reversedNull);
+        assertNull(reversedNull);
+        assertEquals(StringUtils.EMPTY, reversedEmpty);
+    }
+
+    @Test
+    public void whenReverseStringUsingIntStreamRangeMethod_ThenCorrectStringIsReturned() {
+        String reversed = ReverseStringExamples.reverseUsingIntStreamRangeMethod(STRING_INPUT);
+        String reversedNull = ReverseStringExamples.reverseUsingIntStreamRangeMethod(null);
+        String reversedEmpty = ReverseStringExamples.reverseUsingIntStreamRangeMethod(StringUtils.EMPTY);
+
+        assertEquals(STRING_INPUT_REVERSED, reversed);
+        assertNull(reversedNull);
+        assertEquals(StringUtils.EMPTY, reversedEmpty);
+    }
+
+    @Test
+    public void whenReverseStringUsingCharsMethod_ThenCorrectStringIsReturned() {
+        String reversed = ReverseStringExamples.reverseUsingCharsMethod(STRING_INPUT);
+        String reversedNull = ReverseStringExamples.reverseUsingCharsMethod(null);
+        String reversedEmpty = ReverseStringExamples.reverseUsingCharsMethod(StringUtils.EMPTY);
+
+        assertEquals(STRING_INPUT_REVERSED, reversed);
+        assertNull(reversedNull);
+        assertEquals(StringUtils.EMPTY, reversedEmpty);
+    }
+
+    @Test
+    public void whenReverseStringUsingStreamOfMethod_ThenCorrectStringIsReturned() {
+        String reversed = ReverseStringExamples.reverseUsingStreamOfMethod(STRING_INPUT);
+        String reversedNull = ReverseStringExamples.reverseUsingStreamOfMethod(null);
+        String reversedEmpty = ReverseStringExamples.reverseUsingStreamOfMethod(StringUtils.EMPTY);
+
+        assertEquals(STRING_INPUT_REVERSED, reversed);
+        assertNull(reversedNull);
         assertEquals(StringUtils.EMPTY, reversedEmpty);
     }
 

core-java-modules/core-java-string-operations-5/src/main/java/com/baeldung/firstchardigit/FirstCharDigit.java

@@ -0,0 +1,62 @@
+package com.baeldung.firstchardigit;
+
+import java.util.regex.Pattern;
+
+import com.google.common.base.CharMatcher;
+
+public class FirstCharDigit {
+
+    public static boolean checkUsingCharAtMethod(String str) {
+        if (str == null || str.length() == 0) {
+            return false;
+        }
+
+        char c = str.charAt(0);
+        return c >= '0' && c <= '9';
+    }
+
+    public static boolean checkUsingIsDigitMethod(String str) {
+        if (str == null || str.length() == 0) {
+            return false;
+        }
+
+        return Character.isDigit(str.charAt(0));
+    }
+
+    public static boolean checkUsingPatternClass(String str) {
+        if (str == null || str.length() == 0) {
+            return false;
+        }
+
+        return Pattern.compile("^[0-9].*")
+          .matcher(str)
+          .matches();
+    }
+
+    public static boolean checkUsingMatchesMethod(String str) {
+        if (str == null || str.length() == 0) {
+            return false;
+        }
+
+        return str.matches("^[0-9].*");
+    }
+
+    public static boolean checkUsingCharMatcherInRangeMethod(String str) {
+        if (str == null || str.length() == 0) {
+            return false;
+        }
+
+        return CharMatcher.inRange('0', '9')
+          .matches(str.charAt(0));
+    }
+
+    public static boolean checkUsingCharMatcherForPredicateMethod(String str) {
+        if (str == null || str.length() == 0) {
+            return false;
+        }
+
+        return CharMatcher.forPredicate(Character::isDigit)
+          .matches(str.charAt(0));
+    }
+
+}

core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/firstchardigit/FirstCharDigitUnitTest.java

@@ -0,0 +1,58 @@
+package com.baeldung.firstchardigit;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class FirstCharDigitUnitTest {
+
+    @Test
+    void givenString_whenUsingCharAtMethod_thenSuccess() {
+        assertTrue(FirstCharDigit.checkUsingCharAtMethod("12 years"));
+        assertFalse(FirstCharDigit.checkUsingCharAtMethod("years"));
+        assertFalse(FirstCharDigit.checkUsingCharAtMethod(""));
+        assertFalse(FirstCharDigit.checkUsingCharAtMethod(null));
+    }
+
+    @Test
+    void givenString_whenUsingIsDigitMethod_thenSuccess() {
+        assertTrue(FirstCharDigit.checkUsingIsDigitMethod("10 cm"));
+        assertFalse(FirstCharDigit.checkUsingIsDigitMethod("cm"));
+        assertFalse(FirstCharDigit.checkUsingIsDigitMethod(""));
+        assertFalse(FirstCharDigit.checkUsingIsDigitMethod(null));
+    }
+
+    @Test
+    void givenString_whenUsingPatternClass_thenSuccess() {
+        assertTrue(FirstCharDigit.checkUsingPatternClass("1 kg"));
+        assertFalse(FirstCharDigit.checkUsingPatternClass("kg"));
+        assertFalse(FirstCharDigit.checkUsingPatternClass(""));
+        assertFalse(FirstCharDigit.checkUsingPatternClass(null));
+    }
+
+    @Test
+    void givenString_whenUsingMatchesMethod_thenSuccess() {
+        assertTrue(FirstCharDigit.checkUsingMatchesMethod("123"));
+        assertFalse(FirstCharDigit.checkUsingMatchesMethod("ABC"));
+        assertFalse(FirstCharDigit.checkUsingMatchesMethod(""));
+        assertFalse(FirstCharDigit.checkUsingMatchesMethod(null));
+    }
+
+    @Test
+    void givenString_whenUsingCharMatcherInRangeMethod_thenSuccess() {
+        assertTrue(FirstCharDigit.checkUsingCharMatcherInRangeMethod("2023"));
+        assertFalse(FirstCharDigit.checkUsingCharMatcherInRangeMethod("abc"));
+        assertFalse(FirstCharDigit.checkUsingCharMatcherInRangeMethod(""));
+        assertFalse(FirstCharDigit.checkUsingCharMatcherInRangeMethod(null));
+    }
+
+    @Test
+    void givenString_whenUsingCharMatcherForPredicateMethod_thenSuccess() {
+        assertTrue(FirstCharDigit.checkUsingCharMatcherForPredicateMethod("100"));
+        assertFalse(FirstCharDigit.checkUsingCharMatcherForPredicateMethod("abdo"));
+        assertFalse(FirstCharDigit.checkUsingCharMatcherForPredicateMethod(""));
+        assertFalse(FirstCharDigit.checkUsingCharMatcherForPredicateMethod(null));
+    }
+
+}

core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/stringwithquotes/PrintQuotesAroundAStringUnitTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.stringwithquotes;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class PrintQuotesAroundAStringUnitTest {
+    private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+    private final PrintStream originalOut = System.out;
+
+    @BeforeEach
+    void replaceOut() {
+        System.setOut(new PrintStream(outContent));
+    }
+
+    @AfterEach
+    void restoreOut() {
+        System.setOut(originalOut);
+    }
+
+    @Test
+    void whenWrappingAStringWithEscapedQuote_thenGetExpectedResult() {
+        String theySay = "All Java programmers are cute!";
+        String quoted = "\"" + theySay + "\"";
+
+        System.out.println(quoted);
+
+        //assertion
+        String expected = "\"All Java programmers are cute!\"\n";
+        assertEquals(expected, outContent.toString());
+    }
+
+    @Test
+    void whenCallingReplaceAll_thenGetExpectedResult() {
+        String theySay = "Can you write Java code?";
+        String quoted = theySay.replaceAll("^|$", "\"");
+
+        System.out.println(quoted);
+
+        //assertion
+        String expected = "\"Can you write Java code?\"\n";
+        assertEquals(expected, outContent.toString());
+    }
+
+    @Test
+    void whenWrappingAStringWithQuoteChar_thenGetExpectedResult() {
+        String weSay = "Yes, we can write beautiful Java codes!";
+        String quoted = '"' + weSay + '"';
+        System.out.println(quoted);
+
+        //assertion
+        String expected = "\"Yes, we can write beautiful Java codes!\"\n";
+        assertEquals(expected, outContent.toString());
+    }
+}

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

@@ -13,3 +13,4 @@ This module contains articles about strings in Java.
 - [Java Multi-line String](https://www.baeldung.com/java-multiline-string)
 - [Guide to Java String Pool](https://www.baeldung.com/java-string-pool)
 - [Fixing “constant string too long” Build Error](https://www.baeldung.com/java-constant-string-too-long-error)
+- [Reuse StringBuilder for Efficiency](https://www.baeldung.com/java-reuse-stringbuilder-for-efficiency)

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

@@ -5,3 +5,4 @@
 - [Guide to UUID in Java](http://www.baeldung.com/java-uuid)
 - [Validate UUID String in Java](https://www.baeldung.com/java-validate-uuid-string)
 - [Generate the Same UUID From a String in Java](https://www.baeldung.com/java-generate-same-uuid-from-string)
+- [Generating Time Based UUIDs](https://www.baeldung.com/java-generating-time-based-uuids)

core-java-modules/core-java/.gitignore

@@ -1,25 +0,0 @@
-*.class
-
-0.*
-
-#folders#
-/target
-/neoDb*
-/data
-/src/main/webapp/WEB-INF/classes
-*/META-INF/*
-.resourceCache
-
-# Packaged files #
-*.jar
-*.war
-*.ear
-
-# Files generated by integration tests
-backup-pom.xml
-/bin/
-/temp
-
-#IntelliJ specific
-.idea/
-*.iml

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

@@ -1,5 +0,0 @@
-## Core Java Cookbooks and Examples
-
-### Relevant Articles: 
-
-- [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)

core-java-modules/core-java/customers.xml

@@ -1,95 +0,0 @@
-<?xml version="1.0"?>
-<webRowSet xmlns="http://java.sun.com/xml/ns/jdbc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-xsi:schemaLocation="http://java.sun.com/xml/ns/jdbc http://java.sun.com/xml/ns/jdbc/webrowset.xsd">
-  <properties>
-    <command>SELECT * FROM customers</command>
-    <concurrency>1008</concurrency>
-    <datasource><null/></datasource>
-    <escape-processing>true</escape-processing>
-    <fetch-direction>1000</fetch-direction>
-    <fetch-size>0</fetch-size>
-    <isolation-level>2</isolation-level>
-    <key-columns>
-    </key-columns>
-    <map>
-    </map>
-    <max-field-size>0</max-field-size>
-    <max-rows>0</max-rows>
-    <query-timeout>0</query-timeout>
-    <read-only>true</read-only>
-    <rowset-type>ResultSet.TYPE_SCROLL_INSENSITIVE</rowset-type>
-    <show-deleted>false</show-deleted>
-    <table-name>customers</table-name>
-    <url>jdbc:h2:mem:testdb</url>
-    <sync-provider>
-      <sync-provider-name>com.sun.rowset.providers.RIOptimisticProvider</sync-provider-name>
-      <sync-provider-vendor>Oracle Corporation</sync-provider-vendor>
-      <sync-provider-version>1.0</sync-provider-version>
-      <sync-provider-grade>2</sync-provider-grade>
-      <data-source-lock>1</data-source-lock>
-    </sync-provider>
-  </properties>
-  <metadata>
-    <column-count>2</column-count>
-    <column-definition>
-      <column-index>1</column-index>
-      <auto-increment>false</auto-increment>
-      <case-sensitive>true</case-sensitive>
-      <currency>false</currency>
-      <nullable>0</nullable>
-      <signed>true</signed>
-      <searchable>true</searchable>
-      <column-display-size>11</column-display-size>
-      <column-label>ID</column-label>
-      <column-name>ID</column-name>
-      <schema-name>PUBLIC</schema-name>
-      <column-precision>10</column-precision>
-      <column-scale>0</column-scale>
-      <table-name>CUSTOMERS</table-name>
-      <catalog-name>TESTDB</catalog-name>
-      <column-type>4</column-type>
-      <column-type-name>INTEGER</column-type-name>
-    </column-definition>
-    <column-definition>
-      <column-index>2</column-index>
-      <auto-increment>false</auto-increment>
-      <case-sensitive>true</case-sensitive>
-      <currency>false</currency>
-      <nullable>0</nullable>
-      <signed>true</signed>
-      <searchable>true</searchable>
-      <column-display-size>50</column-display-size>
-      <column-label>NAME</column-label>
-      <column-name>NAME</column-name>
-      <schema-name>PUBLIC</schema-name>
-      <column-precision>50</column-precision>
-      <column-scale>0</column-scale>
-      <table-name>CUSTOMERS</table-name>
-      <catalog-name>TESTDB</catalog-name>
-      <column-type>12</column-type>
-      <column-type-name>VARCHAR</column-type-name>
-    </column-definition>
-  </metadata>
-  <data>
-    <currentRow>
-      <columnValue>1</columnValue>
-      <columnValue>Customer1</columnValue>
-    </currentRow>
-    <currentRow>
-      <columnValue>2</columnValue>
-      <columnValue>Customer2</columnValue>
-    </currentRow>
-    <currentRow>
-      <columnValue>3</columnValue>
-      <columnValue>Customer3</columnValue>
-    </currentRow>
-    <currentRow>
-      <columnValue>4</columnValue>
-      <columnValue>Customer4</columnValue>
-    </currentRow>
-    <currentRow>
-      <columnValue>5</columnValue>
-      <columnValue>Customer5</columnValue>
-    </currentRow>
-  </data>
-</webRowSet>

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

@@ -1,180 +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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <artifactId>core-java</artifactId>
-    <name>core-java</name>
-    <packaging>jar</packaging>
-
-    <parent>
-        <groupId>com.baeldung.core-java-modules</groupId>
-        <artifactId>core-java-modules</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.unix4j</groupId>
-            <artifactId>unix4j-command</artifactId>
-            <version>${unix4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.googlecode.grep4j</groupId>
-            <artifactId>grep4j</artifactId>
-            <version>${grep4j.version}</version>
-        </dependency>
-        <!-- web -->
-        <!-- marshalling -->
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-            <version>${jackson.version}</version>
-        </dependency>
-        <!-- logging -->
-        <dependency>
-            <groupId>log4j</groupId>
-            <artifactId>log4j</artifactId>
-            <version>${log4j.version}</version>
-        </dependency>
-        <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
-            <groupId>org.slf4j</groupId>
-            <artifactId>log4j-over-slf4j</artifactId>
-            <version>${org.slf4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.projectlombok</groupId>
-            <artifactId>lombok</artifactId>
-            <version>${lombok.version}</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.javamoney</groupId>
-            <artifactId>moneta</artifactId>
-            <version>${javamoney.moneta.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-core</artifactId>
-            <version>${spring.core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>${commons-io.version}</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <finalName>core-java</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-dependency-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <id>copy-dependencies</id>
-                        <phase>prepare-package</phase>
-                        <goals>
-                            <goal>copy-dependencies</goal>
-                        </goals>
-                        <configuration>
-                            <outputDirectory>${project.build.directory}/libs</outputDirectory>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>exec-maven-plugin</artifactId>
-                <configuration>
-                    <executable>java</executable>
-                    <mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass>
-                    <arguments>
-                        <argument>-Xmx300m</argument>
-                        <argument>-XX:+UseParallelGC</argument>
-                        <argument>-classpath</argument>
-                        <classpath />
-                        <argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
-                    </arguments>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <profiles>
-        <profile>
-            <id>integration</id>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-surefire-plugin</artifactId>
-                        <executions>
-                            <execution>
-                                <phase>integration-test</phase>
-                                <goals>
-                                    <goal>test</goal>
-                                </goals>
-                                <configuration>
-                                    <excludes>
-                                        <exclude>**/*ManualTest.java</exclude>
-                                    </excludes>
-                                    <includes>
-                                        <include>**/*IntegrationTest.java</include>
-                                        <include>**/*IntTest.java</include>
-                                    </includes>
-                                </configuration>
-                            </execution>
-                        </executions>
-                        <configuration>
-                            <systemPropertyVariables>
-                                <test.mime>json</test.mime>
-                            </systemPropertyVariables>
-                        </configuration>
-                    </plugin>
-                    <plugin>
-                        <groupId>org.codehaus.mojo</groupId>
-                        <artifactId>exec-maven-plugin</artifactId>
-                        <executions>
-                            <execution>
-                                <id>run-benchmarks</id>
-                                <!-- <phase>integration-test</phase> -->
-                                <phase>none</phase>
-                                <goals>
-                                    <goal>exec</goal>
-                                </goals>
-                                <configuration>
-                                    <classpathScope>test</classpathScope>
-                                    <executable>java</executable>
-                                    <arguments>
-                                        <argument>-classpath</argument>
-                                        <classpath />
-                                        <argument>org.openjdk.jmh.Main</argument>
-                                        <argument>.*</argument>
-                                    </arguments>
-                                </configuration>
-                            </execution>
-                        </executions>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
-    </profiles>
-
-    <properties>
-        <!-- util -->
-        <unix4j.version>0.4</unix4j.version>
-        <grep4j.version>1.8.7</grep4j.version>
-        <!-- maven plugins -->
-        <javamoney.moneta.version>1.1</javamoney.moneta.version>
-        <spring.core.version>4.3.20.RELEASE</spring.core.version>
-    </properties>
-
-</project>