Merge branch 'master' of https://github.com/Maiklins/tutorials into JAVA-7244-Review_log_statements_for_projects

 Conflicts:

	algorithms-searching/src/test/java/com/baeldung/algorithms/quadtree/QuadTreeSearchUnitTest.java

algorithms-genetic/pom.xml

@@ -50,4 +50,4 @@
         <commons-codec.version>1.11</commons-codec.version>
     </properties>
 
-</project>
+</project>

algorithms-miscellaneous-5/pom.xml

@@ -37,7 +37,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-commons</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
         </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
@@ -53,7 +53,6 @@
         <commons-codec.version>1.11</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <guava.version>28.1-jre</guava.version>
-        <junit.platform.version>1.6.0</junit.platform.version>
     </properties>
 
 </project>

algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/prim/PrimUnitTest.java

@@ -1,10 +1,10 @@
 package com.baeldung.algorithms.prim;
 
+import org.junit.Test;
+
 import java.util.ArrayList;
 import java.util.List;
 
-import org.junit.Test;
-
 public class PrimUnitTest {
 
     @Test

algorithms-miscellaneous-6/pom.xml

@@ -22,7 +22,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-commons</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
         </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
@@ -46,7 +46,6 @@
     <properties>
         <guava.version>28.1-jre</guava.version>
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
-        <junit.platform.version>1.6.0</junit.platform.version>
         <commons-math3.version>3.6.1</commons-math3.version>
     </properties>
 

algorithms-searching/src/main/java/com/baeldung/algorithms/dfs/Graph.java

@@ -29,11 +29,13 @@ public class Graph {
         stack.push(start);
         while (!stack.isEmpty()) {
             int current = stack.pop();
-            isVisited[current] = true;
-            visit(current);
-            for (int dest : adjVertices.get(current)) {
-                if (!isVisited[dest])
-                    stack.push(dest);
+            if(!isVisited[current]){
+                isVisited[current] = true;
+                visit(current);
+                for (int dest : adjVertices.get(current)) {
+                    if (!isVisited[dest])
+                        stack.push(dest);
+                }
             }
         }
     }

algorithms-searching/src/main/java/com/baeldung/algorithms/suffixtree/SuffixTree.java

@@ -8,7 +8,9 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class SuffixTree {
+
     private static final Logger LOGGER = LoggerFactory.getLogger(SuffixTree.class);
+
     private static final String WORD_TERMINATION = "$";
     private static final int POSITION_UNDEFINED = -1;
     private Node root;

algorithms-searching/src/test/java/com/baeldung/algorithms/dfs/GraphUnitTest.java

@@ -2,7 +2,6 @@ package com.baeldung.algorithms.dfs;
 
 import java.util.List;
 
-import com.baeldung.algorithms.dfs.Graph;
 import org.junit.Test;
 
 public class GraphUnitTest {

algorithms-searching/src/test/java/com/baeldung/algorithms/quadtree/QuadTreeSearchUnitTest.java

@@ -10,7 +10,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class QuadTreeSearchUnitTest {
-    
+
     private static final Logger LOGGER = LoggerFactory.getLogger(QuadTreeSearchUnitTest.class);
 
     private static QuadTree quadTree;
@@ -20,7 +20,7 @@ public class QuadTreeSearchUnitTest {
         Region area = new Region(0, 0, 400, 400);
         quadTree = new QuadTree(area);
 
-        float[][] points = new float[][] { { 21, 25 }, { 55, 53 }, { 70, 318 }, { 98, 302 }, 
+        float[][] points = new float[][] { { 21, 25 }, { 55, 53 }, { 70, 318 }, { 98, 302 },
             { 49, 229 }, { 135, 229 }, { 224, 292 }, { 206, 321 }, { 197, 258 }, { 245, 238 } };
 
         for (int i = 0; i < points.length; i++) {
@@ -35,26 +35,28 @@ public class QuadTreeSearchUnitTest {
     public void givenQuadTree_whenSearchingForRange_thenReturn1MatchingItem() {
         Region searchArea = new Region(200, 200, 250, 250);
         List<Point> result = quadTree.search(searchArea, null, "");
+
         LOGGER.debug(result.toString());
         LOGGER.debug(quadTree.printSearchTraversePath());
-       
+
         Assert.assertEquals(1, result.size());
-        Assert.assertArrayEquals(new float[] { 245, 238 }, 
+        Assert.assertArrayEquals(new float[] { 245, 238 },
             new float[]{result.get(0).getX(), result.get(0).getY() }, 0);
     }
-    
+
     @Test
     public void givenQuadTree_whenSearchingForRange_thenReturn2MatchingItems() {
         Region searchArea = new Region(0, 0, 100, 100);
         List<Point> result = quadTree.search(searchArea, null, "");
+
         LOGGER.debug(result.toString());
         LOGGER.debug(quadTree.printSearchTraversePath());
-        
+
         Assert.assertEquals(2, result.size());
-        Assert.assertArrayEquals(new float[] { 21, 25 }, 
+        Assert.assertArrayEquals(new float[] { 21, 25 },
             new float[]{result.get(0).getX(), result.get(0).getY() }, 0);
-        Assert.assertArrayEquals(new float[] { 55, 53 }, 
+        Assert.assertArrayEquals(new float[] { 55, 53 },
             new float[]{result.get(1).getX(), result.get(1).getY() }, 0);
-        
+
     }
 }

algorithms-sorting-2/pom.xml

@@ -32,7 +32,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit-jupiter-api.version}</version>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -47,7 +47,6 @@
         <commons-math3.version>3.6.1</commons-math3.version>
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
         <commons-codec.version>1.11</commons-codec.version>
-        <junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
     </properties>
 
 </project>

algorithms-sorting/pom.xml

@@ -33,7 +33,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit-jupiter-api.version}</version>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -48,7 +48,6 @@
         <commons-math3.version>3.6.1</commons-math3.version>
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
         <commons-codec.version>1.11</commons-codec.version>
-        <junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
     </properties>
 
 </project>

annotations/annotation-processing/pom.xml

@@ -10,7 +10,6 @@
         <groupId>com.baeldung</groupId>
         <version>1.0.0-SNAPSHOT</version>
         <artifactId>annotations</artifactId>
-        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

annotations/annotation-user/pom.xml

@@ -10,7 +10,6 @@
         <groupId>com.baeldung</groupId>
         <artifactId>annotations</artifactId>
         <version>1.0.0-SNAPSHOT</version>
-        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

apache-kafka/README.md

@@ -3,7 +3,7 @@
 This module contains articles about Apache Kafka.
 
 ### Relevant articles
-- [Kafka Streams vs Kafka Consumer](https://www.baeldung.com/java-kafka-streams-vs-kafka-consumer)
+- [Kafka Streams vs. Kafka Consumer](https://www.baeldung.com/java-kafka-streams-vs-kafka-consumer)
 - [Kafka Topic Creation Using Java](https://www.baeldung.com/kafka-topic-creation)
 - [Using Kafka MockConsumer](https://www.baeldung.com/kafka-mockconsumer)
 - [Using Kafka MockProducer](https://www.baeldung.com/kafka-mockproducer)

apache-kafka/pom.xml

@@ -161,6 +161,12 @@
             <artifactId>spark-cassandra-connector-java_2.11</artifactId>
             <version>${com.datastax.spark.spark-cassandra-connector-java.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -175,6 +181,7 @@
         <graphframes.version>0.8.1-spark3.0-s_2.12</graphframes.version>
         <com.datastax.spark.spark-cassandra-connector.version>2.5.2</com.datastax.spark.spark-cassandra-connector.version>
         <com.datastax.spark.spark-cassandra-connector-java.version>1.6.0-M1</com.datastax.spark.spark-cassandra-connector-java.version>
+        <lombok.version>1.18.20</lombok.version>
     </properties>
 
 </project>

apache-kafka/src/main/java/com/baeldung/kafka/dto/MessageDto.java

@@ -0,0 +1,15 @@
+package com.baeldung.kafka.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class MessageDto {
+    private String message;
+    private String version;
+}

apache-kafka/src/main/java/com/baeldung/kafka/serdes/CustomDeserializer.java

@@ -0,0 +1,35 @@
+package com.baeldung.kafka.serdes;
+
+import com.baeldung.kafka.dto.MessageDto;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.common.errors.SerializationException;
+import org.apache.kafka.common.serialization.Deserializer;
+
+import java.util.Map;
+
+public class CustomDeserializer implements Deserializer<MessageDto> {
+
+    private ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public void configure(Map<String, ?> configs, boolean isKey) {
+    }
+
+    @Override
+    public MessageDto deserialize(String topic, byte[] data) {
+        try {
+            if (data == null){
+                System.out.println("Null received at deserializing");
+                return null;
+            }
+            System.out.println("Deserializing...");
+            return objectMapper.readValue(new String(data, "UTF-8"), MessageDto.class);
+        } catch (Exception e) {
+            throw new SerializationException("Error when deserializing byte[] to MessageDto");
+        }
+    }
+
+    @Override
+    public void close() {
+    }
+}

apache-kafka/src/main/java/com/baeldung/kafka/serdes/CustomSerializer.java

@@ -0,0 +1,34 @@
+package com.baeldung.kafka.serdes;
+
+import com.baeldung.kafka.dto.MessageDto;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.common.errors.SerializationException;
+import org.apache.kafka.common.serialization.Serializer;
+
+import java.util.Map;
+
+public class CustomSerializer implements Serializer<MessageDto> {
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public void configure(Map<String, ?> configs, boolean isKey) {
+    }
+
+    @Override
+    public byte[] serialize(String topic, MessageDto data) {
+        try {
+            if (data == null){
+                System.out.println("Null received at serializing");
+                return null;
+            }
+            System.out.println("Serializing...");
+            return objectMapper.writeValueAsBytes(data);
+        } catch (Exception e) {
+            throw new SerializationException("Error when serializing MessageDto to byte[]");
+        }
+    }
+
+    @Override
+    public void close() {
+    }
+}

apache-kafka/src/test/java/com/baeldung/kafka/admin/KafkaTopicApplicationLiveTest.java

@@ -12,8 +12,10 @@ import java.util.Properties;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+// This live test needs a running Docker instance so that a kafka container can be created 
+
 @Testcontainers
-class KafkaTopicApplicationIntegrationTest {
+class KafkaTopicApplicationLiveTest {
 
     @Container
     private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));

apache-kafka/src/test/java/com/baeldung/kafka/serdes/KafkaSerDesLiveTest.java

@@ -0,0 +1,94 @@
+package com.baeldung.kafka.serdes;
+
+import com.baeldung.kafka.dto.MessageDto;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.junit.Before;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.testcontainers.containers.KafkaContainer;
+import org.testcontainers.utility.DockerImageName;
+
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Properties;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.Assert.assertEquals;
+
+// This live test needs a Docker instance running so that kafka container can be created
+
+public class KafkaSerDesLiveTest {
+    private static final String CONSUMER_APP_ID = "consumer_id";
+    private static final String CONSUMER_GROUP_ID = "group_id";
+
+    @ClassRule
+    public static KafkaContainer kafka = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));
+    private final String TOPIC = "mytopic";
+
+    private static KafkaConsumer<String, MessageDto> createKafkaConsumer() {
+
+        Properties props = new Properties();
+        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafka.getBootstrapServers());
+        props.put(ConsumerConfig.CLIENT_ID_CONFIG, CONSUMER_APP_ID);
+        props.put(ConsumerConfig.GROUP_ID_CONFIG, CONSUMER_GROUP_ID);
+        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
+        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "com.baeldung.kafka.serdes.CustomDeserializer");
+
+        return new KafkaConsumer<>(props);
+
+    }
+
+    private static KafkaProducer<String, MessageDto> createKafkaProducer() {
+
+        Properties props = new Properties();
+        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafka.getBootstrapServers());
+        props.put(ProducerConfig.CLIENT_ID_CONFIG, CONSUMER_APP_ID);
+        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
+        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "com.baeldung.kafka.serdes.CustomSerializer");
+
+        return new KafkaProducer(props);
+
+    }
+
+    @Before
+    public void setUp() {
+    }
+
+    @Test
+    public void givenKafkaClientShouldSerializeAndDeserialize() throws InterruptedException {
+
+        MessageDto msgProd = MessageDto.builder().message("test").version("1.0").build();
+
+        KafkaProducer<String, MessageDto> producer = createKafkaProducer();
+        producer.send(new ProducerRecord<String, MessageDto>(TOPIC, "1", msgProd));
+        System.out.println("Message sent " + msgProd);
+        producer.close();
+
+        Thread.sleep(2000);
+
+        AtomicReference<MessageDto> msgCons = new AtomicReference<>();
+
+        KafkaConsumer<String, MessageDto> consumer = createKafkaConsumer();
+        consumer.subscribe(Arrays.asList(TOPIC));
+
+        ConsumerRecords<String, MessageDto> records = consumer.poll(Duration.ofSeconds(1));
+        records.forEach(record -> {
+            msgCons.set(record.value());
+            System.out.println("Message received " + record.value());
+        });
+
+        consumer.close();
+
+        assertEquals(msgProd, msgCons.get());
+
+    }
+
+}
+
+

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

@@ -44,6 +44,8 @@ import static org.apache.kafka.clients.consumer.ConsumerConfig.BOOTSTRAP_SERVERS
 import static org.apache.kafka.clients.producer.ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG;
 import static org.apache.kafka.clients.producer.ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG;
 
+// This live test needs a Docker instance running so that kafka container can be created
+
 public class KafkaStreamsLiveTest {
     private final String LEFT_TOPIC = "left-stream-topic";
     private final String RIGHT_TOPIC = "right-stream-topic";

apache-libraries/pom.xml

@@ -133,6 +133,11 @@
             <artifactId>jackson-databind</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
         <dependency>
             <groupId>com.jayway.awaitility</groupId>
             <artifactId>awaitility</artifactId>
@@ -196,7 +201,6 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <avro.version>1.8.2</avro.version>
-        <slf4j.version>1.7.25</slf4j.version>
         <beam.version>2.19.0</beam.version>
         <assertj.version>3.9.0</assertj.version>
         <bval.version>1.1.2</bval.version>

apache-libraries/src/main/resources/log4j2.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Logger name="org.apache.meecrowave" level="warn">
+            <AppenderRef ref="Console"/>
+        </Logger>
+
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>

apache-libraries/src/test/java/com/baeldung/apache/beam/intro/WordCountUnitTest.java

@@ -10,7 +10,6 @@ import com.baeldung.apache.beam.intro.WordCount;
 public class WordCountUnitTest {
     
     @Test
-    // @Ignore
     public void givenInputFile_whenWordCountRuns_thenJobFinishWithoutError() {
         boolean jobDone = WordCount.wordCount("src/test/resources/wordcount.txt", "target/output");
         assertTrue(jobDone);

apache-poi/src/main/java/com/baeldung/poi/excel/multilinetext/MultilineText.java

@@ -0,0 +1,18 @@
+package com.baeldung.poi.excel.multilinetext;
+
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.CellStyle;
+import org.apache.poi.ss.usermodel.Row;
+
+public class MultilineText {
+    public void formatMultilineText(Cell cell, int cellNumber) {
+        cell.getRow()
+            .setHeightInPoints(cell.getSheet()
+                .getDefaultRowHeightInPoints() * 2);
+        CellStyle cellStyle = cell.getSheet()
+            .getWorkbook()
+            .createCellStyle();
+        cellStyle.setWrapText(true);
+        cell.setCellStyle(cellStyle);
+    }
+}

apache-poi/src/test/java/com/baeldung/poi/excel/multilinetext/MultilineTextUnitTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.poi.excel.multilinetext;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.nio.file.Paths;
+
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.DataFormatter;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.Before;
+import org.junit.Test;
+
+public class MultilineTextUnitTest {
+    private static String FILE_NAME = "com/baeldung/poi/excel/multilinetext/MultilineTextTest.xlsx";
+    private static final String NEW_FILE_NAME = "MultilineTextTest_output.xlsx";
+    private static final int STRING_ROW_INDEX = 1;
+    private static final int STRING_CELL_INDEX = 0;
+
+    private String fileLocation;
+
+    @Before
+    public void setup() throws IOException, URISyntaxException {
+        fileLocation = Paths.get(ClassLoader.getSystemResource(FILE_NAME)
+            .toURI())
+            .toString();
+    }
+
+    @Test
+    public void givenMultilineTextCell_whenFormated_thenMultilineTextVisible() throws IOException {
+        Workbook workbook = new XSSFWorkbook(fileLocation);
+        Sheet sheet = workbook.getSheetAt(0);
+        sheet.createRow(STRING_ROW_INDEX);
+        Row row = sheet.getRow(STRING_ROW_INDEX);
+        Cell cell = row.createCell(STRING_CELL_INDEX);
+
+        cell.setCellValue("Hello \n world!");
+        MultilineText multilineText = new MultilineText();
+        multilineText.formatMultilineText(cell, STRING_CELL_INDEX);
+
+        FileOutputStream outputStream = new FileOutputStream(NEW_FILE_NAME);
+        workbook.write(outputStream);
+        outputStream.close();
+
+        File file = new File(NEW_FILE_NAME);
+        FileInputStream fileInputStream = new FileInputStream(file);
+        Workbook testWorkbook = new XSSFWorkbook(fileInputStream);
+        assertTrue(row.getHeightInPoints() == testWorkbook.getSheetAt(0)
+            .getRow(STRING_ROW_INDEX)
+            .getHeightInPoints());
+        DataFormatter formatter = new DataFormatter();
+        assertEquals("Hello \n world!", formatter.formatCellValue(testWorkbook.getSheetAt(0)
+            .getRow(STRING_ROW_INDEX)
+            .getCell(STRING_CELL_INDEX)));
+        testWorkbook.close();
+        fileInputStream.close();
+        file.delete();
+
+        workbook.close();
+    }
+}

apache-shiro/pom.xml

@@ -39,10 +39,6 @@
             <scope>runtime</scope>
         </dependency>
         <!-- spring-sec -->
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-security</artifactId>

apache-spark/src/main/resources/log4j.properties

@@ -0,0 +1,42 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Set everything to be logged to the console
+log4j.rootCategory=WARN, console
+log4j.appender.console=org.apache.log4j.ConsoleAppender
+log4j.appender.console.target=System.err
+log4j.appender.console.layout=org.apache.log4j.PatternLayout
+log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}: %m%n
+
+# Set the default spark-shell log level to WARN. When running the spark-shell, the
+# log level for this class is used to overwrite the root logger's log level, so that
+# the user can have different defaults for the shell and regular Spark apps.
+log4j.logger.org.apache.spark.repl.Main=WARN
+
+# Settings to quiet third party logs that are too verbose
+log4j.logger.org.spark_project.jetty=WARN
+log4j.logger.org.spark_project.jetty.util.component.AbstractLifeCycle=ERROR
+log4j.logger.org.apache.spark.repl.SparkIMain$exprTyper=INFO
+log4j.logger.org.apache.spark.repl.SparkILoop$SparkILoopInterpreter=INFO
+
+# SPARK-9183: Settings to avoid annoying messages when looking up nonexistent UDFs in SparkSQL with Hive support
+log4j.logger.org.apache.hadoop.hive.metastore.RetryingHMSHandler=FATAL
+log4j.logger.org.apache.hadoop.hive.ql.exec.FunctionRegistry=ERROR
+
+# Parquet related logging
+log4j.logger.org.apache.parquet.CorruptStatistics=ERROR
+log4j.logger.parquet.CorruptStatistics=ERROR

apache-tapestry/pom.xml

@@ -32,7 +32,6 @@
         <!-- Uncomment this to add support for file uploads: -->
         <!-- <dependency> <groupId>org.apache.tapestry</groupId> <artifactId>tapestry-upload</artifactId> 
             <version>${tapestry-release-version}</version> </dependency> -->
-
         <!-- A dependency on either JUnit or TestNG is required, or the surefire plugin (which runs the 
             tests) will fail, preventing Maven from packaging the WAR. Tapestry includes a large number of testing 
             facilities designed for use with TestNG (http://testng.org/), so it's recommended. -->
@@ -110,8 +109,6 @@
         </plugins>
     </build>
 
-    <reporting />
-
     <repositories>
         <repository>
             <id>jboss</id>

apache-thrift/pom.xml

@@ -29,7 +29,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
-            <version>${org.slf4j.slf4j-simple.version}</version>
+            <version>${org.slf4j.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
@@ -61,7 +61,6 @@
     <properties>
         <thrift.version>0.10.0</thrift.version>
         <maven-thrift.version>0.1.11</maven-thrift.version>
-        <org.slf4j.slf4j-simple.version>1.7.12</org.slf4j.slf4j-simple.version>
         <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
     </properties>
 

atomikos/pom.xml

@@ -72,9 +72,9 @@
             <version>${derby.version}</version>
         </dependency>
         <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <!-- the JTA API -->

aws-lambda/lambda/pom.xml

@@ -62,6 +62,13 @@
             <groupId>com.googlecode.json-simple</groupId>
             <artifactId>json-simple</artifactId>
             <version>${json-simple.version}</version>
+            <exclusions>
+                <!-- junit4 dependency is excluded as it should to be resolved from junit-vintage-engine included in parent-modules. -->
+                <exclusion>
+                    <groupId>junit</groupId>
+                    <artifactId>junit</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
     </dependencies>
 

aws-lambda/shipping-tracker/ShippingFunction/pom.xml

@@ -12,23 +12,17 @@
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-core</artifactId>
-            <version>1.2.0</version>
+            <version>${aws-lambda-java-core.version}</version>
         </dependency>
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-events</artifactId>
-            <version>3.1.0</version>
+            <version>${aws-lambda-java-events.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.11.2</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
-            <scope>test</scope>
+            <version>${jackson-databind.version}</version>
         </dependency>
         <dependency>
             <groupId>org.hibernate</groupId>
@@ -43,7 +37,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.2.16</version>
+            <version>${postgresql.version}</version>
         </dependency>
     </dependencies>
 
@@ -71,6 +65,10 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <hibernate.version>5.4.21.Final</hibernate.version>
+        <aws-lambda-java-core.version>1.2.0</aws-lambda-java-core.version>
+        <aws-lambda-java-events.version>3.1.0</aws-lambda-java-events.version>
+        <jackson-databind.version>2.11.2</jackson-databind.version>
+        <postgresql.version>42.2.16</postgresql.version>
     </properties>
 
 </project>

aws-lambda/todo-reminder/ToDoFunction/pom.xml

@@ -12,70 +12,70 @@
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-core</artifactId>
-            <version>1.2.1</version>
+            <version>${aws-lambda-java-core.version}</version>
         </dependency>
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-events</artifactId>
-            <version>3.6.0</version>
+            <version>${aws-lambda-java-events.version}</version>
         </dependency>
         <dependency>
             <groupId>uk.org.webcompere</groupId>
             <artifactId>lightweight-config</artifactId>
-            <version>1.1.0</version>
+            <version>${lightweight-config.version}</version>
         </dependency>
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-log4j2</artifactId>
-            <version>1.2.0</version>
+            <version>${aws-lambda-java-log4j2.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
-            <version>2.13.2</version>
+            <version>${log4j-slf4j-impl.version}</version>
         </dependency>
         <dependency>
             <groupId>io.github.openfeign</groupId>
             <artifactId>feign-core</artifactId>
-            <version>11.2</version>
+            <version>${feign-core.version}</version>
         </dependency>
         <dependency>
             <groupId>io.github.openfeign</groupId>
             <artifactId>feign-slf4j</artifactId>
-            <version>11.2</version>
+            <version>${feign-core.version}</version>
         </dependency>
         <dependency>
             <groupId>io.github.openfeign</groupId>
             <artifactId>feign-gson</artifactId>
-            <version>11.2</version>
+            <version>${feign-core.version}</version>
         </dependency>
         <dependency>
             <groupId>com.google.inject</groupId>
             <artifactId>guice</artifactId>
-            <version>5.0.1</version>
+            <version>${guice.version}</version>
         </dependency>
         <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.13.1</version>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>uk.org.webcompere</groupId>
             <artifactId>system-stubs-junit4</artifactId>
-            <version>1.2.0</version>
+            <version>${system-stubs-junit4.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>
-            <version>3.3.0</version>
+            <version>${mockito-core.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
-            <version>3.19.0</version>
+            <version>${assertj-core.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
@@ -103,6 +103,17 @@
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
+        <aws-lambda-java-core.version>1.2.1</aws-lambda-java-core.version>
+        <aws-lambda-java-events.version>3.6.0</aws-lambda-java-events.version>
+        <lightweight-config.version>1.1.0</lightweight-config.version>
+        <aws-lambda-java-log4j2.version>1.2.0</aws-lambda-java-log4j2.version>
+        <log4j-slf4j-impl.version>2.13.2</log4j-slf4j-impl.version>
+        <feign-core.version>11.2</feign-core.version>
+        <guice.version>5.0.1</guice.version>
+        <system-stubs-junit4.version>1.2.0</system-stubs-junit4.version>
+        <mockito-core.version>3.3.0</mockito-core.version>
+        <assertj-core.version>3.19.0</assertj-core.version>
+        <junit-jupiter.version>5.8.1</junit-jupiter.version>
     </properties>
 
 </project>

aws-reactive/pom.xml

@@ -93,5 +93,5 @@
         <spring.version>2.2.1.RELEASE</spring.version>
         <awssdk.version>2.10.27</awssdk.version>
     </properties>
-    
+
 </project>

aws/README.md

@@ -6,7 +6,7 @@ This module contains articles about Amazon Web Services (AWS)
 
 - [AWS Lambda Using DynamoDB With Java](https://www.baeldung.com/aws-lambda-dynamodb-java)
 - [AWS S3 with Java](https://www.baeldung.com/aws-s3-java)
-- [AWS Lambda With Java](https://www.baeldung.com/java-aws-lambda)
+- [A Basic AWS Lambda Example With Java](https://www.baeldung.com/java-aws-lambda)
 - [Managing EC2 Instances in Java](https://www.baeldung.com/ec2-java)
 - [Multipart Uploads in Amazon S3 with Java](https://www.baeldung.com/aws-s3-multipart-upload)
 - [Integration Testing with a Local DynamoDB Instance](https://www.baeldung.com/dynamodb-local-integration-tests)

axon/README.md

@@ -6,3 +6,4 @@ This module contains articles about Axon
 
 - [A Guide to the Axon Framework](https://www.baeldung.com/axon-cqrs-event-sourcing)
 - [Multi-Entity Aggregates in Axon](https://www.baeldung.com/java-axon-multi-entity-aggregates)
+- [Snapshotting Aggregates in Axon](https://www.baeldung.com/axon-snapshotting-aggregates)

axon/src/main/java/com/baeldung/axon/OrderApplicationConfiguration.java

@@ -0,0 +1,18 @@
+package com.baeldung.axon;
+
+import org.axonframework.eventsourcing.EventCountSnapshotTriggerDefinition;
+import org.axonframework.eventsourcing.SnapshotTriggerDefinition;
+import org.axonframework.eventsourcing.Snapshotter;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class OrderApplicationConfiguration {
+
+    @Bean
+    public SnapshotTriggerDefinition orderAggregateSnapshotTriggerDefinition(Snapshotter snapshotter,
+                                                                             @Value("${axon.aggregate.order.snapshot-threshold:250}") int threshold) {
+        return new EventCountSnapshotTriggerDefinition(snapshotter, threshold);
+    }
+}

axon/src/main/java/com/baeldung/axon/commandmodel/order/OrderAggregate.java

@@ -23,7 +23,7 @@ import java.util.Map;
 
 import static org.axonframework.modelling.command.AggregateLifecycle.apply;
 
-@Aggregate
+@Aggregate(snapshotTriggerDefinition = "orderAggregateSnapshotTriggerDefinition")
 public class OrderAggregate {
 
     @AggregateIdentifier

blade/pom.xml

@@ -70,6 +70,7 @@
                 <artifactId>maven-failsafe-plugin</artifactId>
                 <version>${maven-failsafe-plugin.version}</version>
                 <configuration>
+                    <skipITs>true</skipITs>
                     <includes>
                         <include>**/*LiveTest.java</include>
                     </includes>

core-groovy-2/gmavenplus-pom.xml

@@ -33,7 +33,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -95,7 +95,7 @@
                     <dependency>
                         <groupId>org.junit.platform</groupId>
                         <artifactId>junit-platform-surefire-provider</artifactId>
-                        <version>${junit.platform.version}</version>
+                        <version>${junit-platform-surefire-provider.version}</version>
                     </dependency>
                 </dependencies>
                 <executions>
@@ -165,7 +165,6 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <junit.platform.version>1.0.0</junit.platform.version>
         <hsqldb.version>2.4.0</hsqldb.version>
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
         <commons-lang3.version>3.9</commons-lang3.version>

core-groovy-2/pom.xml

@@ -34,7 +34,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -94,7 +94,7 @@
                     <dependency>
                         <groupId>org.junit.platform</groupId>
                         <artifactId>junit-platform-surefire-provider</artifactId>
-                        <version>${junit.platform.version}</version>
+                        <version>${junit-platform-surefire-provider.version}</version>
                     </dependency>
                 </dependencies>
                 <executions>
@@ -162,11 +162,9 @@
     </repositories>
 
     <properties>
-        <junit.platform.version>1.0.0</junit.platform.version>
         <hsqldb.version>2.4.0</hsqldb.version>
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
         <groovy-wslite.version>1.1.3</groovy-wslite.version>
-        <logback.version>1.2.3</logback.version>
         <groovy.version>2.5.7</groovy.version>
         <assembly.plugin.version>3.1.0</assembly.plugin.version>
         <compiler.plugin.version>3.8.0</compiler.plugin.version>

core-groovy-collections/pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -80,7 +80,7 @@
                     <dependency>
                         <groupId>org.junit.platform</groupId>
                         <artifactId>junit-platform-surefire-provider</artifactId>
-                        <version>${junit.platform.version}</version>
+                        <version>${junit-platform-surefire-provider.version}</version>
                     </dependency>
                 </dependencies>
                 <executions>
@@ -119,7 +119,6 @@
     </repositories>
 
     <properties>
-        <junit.platform.version>1.0.0</junit.platform.version>
         <groovy.version>2.5.6</groovy.version>
         <groovy-all.version>2.5.6</groovy-all.version>
         <groovy-sql.version>2.5.6</groovy-sql.version>

core-groovy-strings/pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -80,7 +80,7 @@
                     <dependency>
                         <groupId>org.junit.platform</groupId>
                         <artifactId>junit-platform-surefire-provider</artifactId>
-                        <version>${junit.platform.version}</version>
+                        <version>${junit-platform-surefire-provider.version}</version>
                     </dependency>
                 </dependencies>
                 <executions>
@@ -109,7 +109,6 @@
     </repositories>
 
     <properties>
-        <junit.platform.version>1.0.0</junit.platform.version>
         <groovy.version>2.5.6</groovy.version>
         <groovy-all.version>2.5.6</groovy-all.version>
         <groovy-sql.version>2.5.6</groovy-sql.version>

core-groovy/pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -80,7 +80,7 @@
                     <dependency>
                         <groupId>org.junit.platform</groupId>
                         <artifactId>junit-platform-surefire-provider</artifactId>
-                        <version>${junit.platform.version}</version>
+                        <version>${junit-platform-surefire-provider.version}</version>
                     </dependency>
                 </dependencies>
                 <executions>
@@ -109,7 +109,6 @@
     </repositories>
 
     <properties>
-        <junit.platform.version>1.0.0</junit.platform.version>
         <groovy.version>2.5.6</groovy.version>
         <groovy-all.version>2.5.6</groovy-all.version>
         <groovy-sql.version>2.5.6</groovy-sql.version>

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

@@ -8,3 +8,4 @@ This module contains articles about Java 11 core features
 - [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
 - [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
 - [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
+- [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)

core-java-modules/core-java-11-2/pom.xml

@@ -35,19 +35,19 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-engine</artifactId>
-            <version>${junit.jupiter.version}</version>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-params</artifactId>
-            <version>${junit.jupiter.version}</version>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit.jupiter.version}</version>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -106,7 +106,6 @@
         <maven.compiler.source.version>11</maven.compiler.source.version>
         <maven.compiler.target.version>11</maven.compiler.target.version>
         <guava.version>29.0-jre</guava.version>
-        <junit.jupiter.version>5.7.0</junit.jupiter.version>
         <assertj.version>3.17.2</assertj.version>
         <mockserver.version>5.11.1</mockserver.version>
         <commons-lang3.version>3.12.0</commons-lang3.version>

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

@@ -1,60 +1,60 @@
 <?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-12</artifactId>
-	<version>0.1.0-SNAPSHOT</version>
-	<name>core-java-12</name>
-	<packaging>jar</packaging>
-	<url>http://maven.apache.org</url>
+    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-12</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-12</name>
+    <packaging>jar</packaging>
+    <url>http://maven.apache.org</url>
 
-	<parent>
-		<groupId>com.baeldung</groupId>
-		<artifactId>parent-modules</artifactId>
-		<version>1.0.0-SNAPSHOT</version>
-		<relativePath>../../</relativePath>
-	</parent>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
 
-	<dependencies>
-		<dependency>
-			<groupId>org.assertj</groupId>
-			<artifactId>assertj-core</artifactId>
-			<version>${assertj.version}</version>
-			<scope>test</scope>
-		</dependency>
-		<dependency>
-			<groupId>commons-io</groupId>
-			<artifactId>commons-io</artifactId>
-			<version>2.11.0</version>
-		</dependency>
-	</dependencies>
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.11.0</version>
+        </dependency>
+    </dependencies>
 
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>${maven-compiler-plugin.version}</version>
-				<configuration>
-					<source>${maven.compiler.source.version}</source>
-					<target>${maven.compiler.target.version}</target>
-					<compilerArgs>--enable-preview</compilerArgs>
-				</configuration>
-			</plugin>
-			<plugin>
-				<artifactId>maven-surefire-plugin</artifactId>
-				<configuration>
-					<argLine>--enable-preview</argLine>
-				</configuration>
-			</plugin>
-		</plugins>
-	</build>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <argLine>--enable-preview</argLine>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
-	<properties>
-		<maven.compiler.source.version>12</maven.compiler.source.version>
-		<maven.compiler.target.version>12</maven.compiler.target.version>
-		<assertj.version>3.6.1</assertj.version>
-	</properties>
+    <properties>
+        <maven.compiler.source.version>12</maven.compiler.source.version>
+        <maven.compiler.target.version>12</maven.compiler.target.version>
+        <assertj.version>3.6.1</assertj.version>
+    </properties>
 
 </project>

core-java-modules/core-java-14/pom.xml

@@ -14,7 +14,7 @@
         <version>1.0.0-SNAPSHOT</version>
         <relativePath>../../</relativePath>
     </parent>
-    
+
     <dependencies>
         <dependency>
             <groupId>org.assertj</groupId>
@@ -35,7 +35,7 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
-    
+
     <build>
         <plugins>
             <plugin>

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

@@ -1,3 +1,7 @@
 ### Relevant articles:
 
 - [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)
+- [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
+- [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
+- [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
+- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)

core-java-modules/core-java-16/pom.xml

@@ -1,53 +1,86 @@
 <?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-16</artifactId>
-	<version>0.1.0-SNAPSHOT</version>
-	<name>core-java-16</name>
-	<packaging>jar</packaging>
-	<url>http://maven.apache.org</url>
+    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-16</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-16</name>
+    <packaging>jar</packaging>
+    <url>http://maven.apache.org</url>
 
-	<parent>
-		<groupId>com.baeldung</groupId>
-		<artifactId>parent-modules</artifactId>
-		<version>1.0.0-SNAPSHOT</version>
-		<relativePath>../../</relativePath>
-	</parent>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
 
-	<dependencies>
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.12.0</version>
+        </dependency>
 		<dependency>
-			<groupId>org.assertj</groupId>
-			<artifactId>assertj-core</artifactId>
-			<version>${assertj.version}</version>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-engine</artifactId>
+			<version>${junit-jupiter.version}</version>
 			<scope>test</scope>
 		</dependency>
 		<dependency>
-			<groupId>org.apache.commons</groupId>
-			<artifactId>commons-lang3</artifactId>
-			<version>3.12.0</version>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>${junit-jupiter.version}</version>
+			<scope>test</scope>
 		</dependency>
-	</dependencies>
+    </dependencies>
 
-	<build>
-		<plugins>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <release>${maven.compiler.release}</release>
+					<compilerArgs>--enable-preview</compilerArgs>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                </configuration>
+            </plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>${maven-compiler-plugin.version}</version>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>${surefire.plugin.version}</version>
 				<configuration>
-					<source>${maven.compiler.source.version}</source>
-					<target>${maven.compiler.target.version}</target>
+					<argLine>--enable-preview</argLine>
+					<forkCount>1</forkCount>
 				</configuration>
+				<dependencies>
+					<dependency>
+						<groupId>org.apache.maven.surefire</groupId>
+						<artifactId>surefire-api</artifactId>
+						<version>${surefire.plugin.version}</version>
+					</dependency>
+				</dependencies>
 			</plugin>
-		</plugins>
-	</build>
+        </plugins>
+    </build>
 
-	<properties>
-		<maven.compiler.source.version>16</maven.compiler.source.version>
-		<maven.compiler.target.version>16</maven.compiler.target.version>
-		<assertj.version>3.6.1</assertj.version>
-	</properties>
+    <properties>
+        <maven.compiler.source.version>16</maven.compiler.source.version>
+        <maven.compiler.target.version>16</maven.compiler.target.version>
+		<maven.compiler.release>16</maven.compiler.release>
+		<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
+		<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
+		<assertj.version>3.17.2</assertj.version>
+    </properties>
 
 </project>

core-java-modules/core-java-16/src/main/java/com/baeldung/features/HelloWorld.java

@@ -0,0 +1,7 @@
+package com.baeldung.features;
+
+interface HelloWorld {
+    default String hello() {
+        return "world";
+    }
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/OuterClass.java

@@ -0,0 +1,9 @@
+package com.baeldung.features;
+
+import com.baeldung.features.record.Book;
+
+public class OuterClass {
+    class InnerClass {
+        Book book = new Book("Title", "author", "isbn");
+    }
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/VectorExample.java

@@ -0,0 +1,23 @@
+package com.baeldung.features;
+
+import jdk.incubator.vector.IntVector;
+
+public class VectorExample {
+    public int[] scalarComputation(int[] a, int[] b) {
+        var c = new int[a.length];
+        for (int i = 0; i < a.length; i++) {
+            c[i] = a[i] * b[i];
+        }
+        return c;
+    }
+
+    public int[] vectorComputation(int[] a, int[] b) {
+        var c = new int[a.length];
+
+        var vectorA = IntVector.fromArray(IntVector.SPECIES_128, a, 0);
+        var vectorB = IntVector.fromArray(IntVector.SPECIES_128, b, 0);
+        var vectorC = vectorA.mul(vectorB);
+        vectorC.intoArray(c, 0);
+        return c;
+    }
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/model/Book.java

@@ -0,0 +1,44 @@
+package com.baeldung.features.model;
+
+import java.util.Objects;
+
+public final class Book {
+    private final String title;
+    private final String author;
+    private final String isbn;
+
+    public Book(String title, String author, String isbn) {
+        this.title = title;
+        this.author = author;
+        this.isbn = isbn;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public String getIsbn() {
+        return isbn;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Book book = (Book) o;
+        return Objects.equals(title, book.title) && Objects.equals(author, book.author) && Objects.equals(isbn, book.isbn);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(title, author, isbn);
+    }
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/record/Book.java

@@ -0,0 +1,4 @@
+package com.baeldung.features.record;
+
+public record Book(String title, String author, String isbn) {
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/JungleAnimal.java

@@ -0,0 +1,4 @@
+package com.baeldung.features.sealed;
+
+public sealed interface JungleAnimal permits Monkey, Snake  {
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Monkey.java

@@ -0,0 +1,4 @@
+package com.baeldung.features.sealed;
+
+public final class Monkey implements JungleAnimal {
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Sealed.java

@@ -0,0 +1,13 @@
+package com.baeldung.features.sealed;
+
+public class Sealed {
+    public static void main(String... args) {
+        JungleAnimal j = new Monkey();
+
+        if (j instanceof Monkey m) {
+            // do logic
+        } else if (j instanceof Snake s) {
+            // do logic
+        }
+    }
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/features/sealed/Snake.java

@@ -0,0 +1,4 @@
+package com.baeldung.features.sealed;
+
+public non-sealed class Snake implements JungleAnimal {
+}

core-java-modules/core-java-16/src/main/java/module-info.java

@@ -0,0 +1,4 @@
+module core.java {
+    requires jdk.incubator.vector;
+    requires org.apache.commons.lang3;
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/features/DayPeriodSupportUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.features;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalTime;
+import java.time.format.DateTimeFormatter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class DayPeriodSupportUnitTest {
+
+    @Test
+    public void givenASpecificTime_whenFormattingUsingTheBSymbol_thenExpectVerbosePeriodOfDay() {
+        LocalTime date = LocalTime.parse("15:25:08.690791");
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("h B");
+        assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
+
+        formatter = DateTimeFormatter.ofPattern("h BBBB");
+        assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
+
+        formatter = DateTimeFormatter.ofPattern("h BBBBB");
+        assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
+    }
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/features/HelloWorldUnitTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.features;
+
+
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+
+import static java.lang.ClassLoader.getSystemClassLoader;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class HelloWorldUnitTest {
+
+    @Test
+    public void givenAnInterfaceWithDefaulMethod_whenCreatingProxyInstance_thenCanInvokeDefaultMethod() throws Exception {
+        Object proxy = Proxy.newProxyInstance(getSystemClassLoader(), new Class<?>[] { HelloWorld.class },
+            (prox, method, args) -> {
+                if (method.isDefault()) {
+                    return InvocationHandler.invokeDefault(prox, method, args);
+                }
+                return method.invoke(prox, args);
+            }
+        );
+        Method method = proxy.getClass().getMethod("hello");
+        assertThat(method.invoke(proxy)).isEqualTo("world");
+    }
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/features/InstanceOfPatternMatchingUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.features;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class InstanceOfPatternMatchingUnitTest {
+
+    @Test
+    void givenTheNewPatternMatchingAbility_whenComparingAgainstTheTradiationalApproach_thenBothVariablesAreEqual() {
+        Object obj = "TEST";
+
+        if (obj instanceof String a) {
+            String b = (String) obj;
+            assertThat(a).isEqualTo(b);
+        }
+    }
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/features/StreamToListUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.features;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class StreamToListUnitTest {
+
+    @Test
+    void givenAStream_whenCreatingANewListFromStream_thenCollectorsOrInbuiltFunctionAreEquivalent() {
+        List<String> integersAsString = Arrays.asList("1", "2", "3");
+        List<Integer> ints = integersAsString.stream().map(Integer::parseInt).collect(Collectors.toList());
+        List<Integer> intsEquivalent = integersAsString.stream().map(Integer::parseInt).toList();
+        assertThat(ints).isEqualTo(intsEquivalent);
+    }
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/features/VectorExampleUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.features;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+class VectorExampleUnitTest {
+
+    @Test
+    void givenAScalarComputation_whenCalculatingUsingVectorAPI_thenResultIsSameAsPreviousMethodOfComputation() {
+        VectorExample objectUnderTest = new VectorExample();
+
+        int[] a = {1, 2, 3, 4};
+        int[] b = {5, 6, 7, 8};
+
+        int[] result = objectUnderTest.scalarComputation(a, b);
+        int[] result2 = objectUnderTest.vectorComputation(a, b);
+
+        assertArrayEquals(result, result2);
+    }
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/streams/StreamToListComparisonWithCollectorsToListUnitTest.java

@@ -0,0 +1,128 @@
+package com.baeldung.streams;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class StreamToListComparisonWithCollectorsToListUnitTest {
+
+    @Test
+    public void whenAddingtoCollectToList_thenSuccess() {
+
+        List<String> result = Stream.of(Locale.getISOCountries())
+          .collect(Collectors.toList());
+
+        Assertions.assertDoesNotThrow(() -> {
+            result.add("test");
+        });
+    }
+
+    @Test
+    public void whenSortingtoCollectToList_thenSuccess() {
+
+        List<String> result = Stream.of(Locale.getISOCountries())
+          .collect(Collectors.toList());
+
+        Assertions.assertDoesNotThrow(() -> {
+            result.sort(String::compareToIgnoreCase);
+        });
+    }
+
+    @Test
+    public void whenAddingCollectUnmodifiableToList_thenException() {
+
+        List<String> result = Stream.of(Locale.getISOCountries())
+          .collect(Collectors.toUnmodifiableList());
+
+        Assertions.assertThrows(UnsupportedOperationException.class, () -> {
+            result.add("test");
+        });
+    }
+
+    @Test
+    public void whenSortingCollectUnmodifiableToList_thenSortException() {
+
+        List<String> result = Stream.of(Locale.getISOCountries())
+          .collect(Collectors.toUnmodifiableList());
+
+        Assertions.assertThrows(UnsupportedOperationException.class, () -> {
+            result.sort(String::compareToIgnoreCase);
+        });
+    }
+
+    @Test
+    public void whenAddingStreamToList_thenException() {
+
+        List<String> result = Stream.of(Locale.getISOCountries())
+          .toList();
+
+        Assertions.assertThrows(UnsupportedOperationException.class, () -> {
+            result.add("test");
+        });
+    }
+
+    @Test
+    public void whenSortingStreamToList_thenException() {
+
+        List<String> result = Stream.of(Locale.getISOCountries())
+          .toList();
+
+        Assertions.assertThrows(UnsupportedOperationException.class, () -> {
+            result.sort(String::compareToIgnoreCase);
+        });
+    }
+
+    @Test
+    public void whenComparingStreamToList_withCollectToList_thenEqual() {
+
+        List<String> streamToList = Stream.of(Locale.getISOCountries())
+          .toList();
+        List<String> collectToList = Stream.of(Locale.getISOCountries())
+          .collect(Collectors.toList());
+
+        Assertions.assertEquals(streamToList, collectToList);
+    }
+
+    @Test
+    public void whenComparingStreamToList_withUnmodifiedCollectToList_thenEqual() {
+
+        List<String> streamToList = Stream.of(Locale.getISOCountries())
+          .toList();
+        List<String> collectToUnmodifiableList = Stream.of(Locale.getISOCountries())
+          .collect(Collectors.toUnmodifiableList());
+
+        Assertions.assertEquals(streamToList, collectToUnmodifiableList);
+    }
+
+    @Test
+    public void whenNullCollectorsToList_thenSuccess() {
+
+        Assertions.assertDoesNotThrow(() -> {
+            Stream.of(null, null)
+              .collect(Collectors.toList());
+        });
+    }
+
+    @Test
+    public void whenNullCollectorsUnmodifiableToList_thenException() {
+
+        Assertions.assertThrows(NullPointerException.class, () -> {
+            Stream.of(null, null)
+              .collect(Collectors.toUnmodifiableList());
+        });
+    }
+
+    @Test
+    public void whenNullStreamToList_thenSuccess() {
+
+        Assertions.assertDoesNotThrow(() -> {
+            Stream.of(null, null)
+              .toList();
+        });
+    }
+
+}

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

@@ -0,0 +1,3 @@
+### Relevant articles:
+
+- [Pattern Matching for Switch](https://www.baeldung.com/java-switch-pattern-matching)

core-java-modules/core-java-17/pom.xml

@@ -0,0 +1,81 @@
+<?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-17</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-17</name>
+    <packaging>jar</packaging>
+    <url>http://maven.apache.org</url>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-engine</artifactId>
+			<version>${junit-jupiter.version}</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>${junit-jupiter.version}</version>
+			<scope>test</scope>
+		</dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <release>${maven.compiler.release}</release>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                </configuration>
+            </plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>${surefire.plugin.version}</version>
+				<configuration>
+					<argLine>--enable-preview</argLine>
+					<forkCount>1</forkCount>
+				</configuration>
+				<dependencies>
+					<dependency>
+						<groupId>org.apache.maven.surefire</groupId>
+						<artifactId>surefire-api</artifactId>
+						<version>${surefire.plugin.version}</version>
+					</dependency>
+				</dependencies>
+			</plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source.version>17</maven.compiler.source.version>
+        <maven.compiler.target.version>17</maven.compiler.target.version>
+		<maven.compiler.release>17</maven.compiler.release>
+		<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
+		<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
+		<assertj.version>3.17.2</assertj.version>
+    </properties>
+
+</project>

core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/GuardedPatterns.java

@@ -0,0 +1,25 @@
+package com.baeldung.switchpatterns;
+
+public class GuardedPatterns {
+
+    static double getDoubleValueUsingIf(Object o) {
+        return switch (o) {
+            case String s -> {
+                if (s.length() > 0) {
+                    yield Double.parseDouble(s);
+                } else {
+                    yield 0d;
+                }
+            }
+            default -> 0d;
+        };
+    }
+
+    static double getDoubleValueUsingGuardedPatterns(Object o) {
+        return switch (o) {
+            case String s && s.length() > 0 -> Double.parseDouble(s);
+            default -> 0d;
+        };
+    }
+
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/HandlingNullValues.java

@@ -0,0 +1,20 @@
+package com.baeldung.switchpatterns;
+
+public class HandlingNullValues {
+
+    static double getDoubleUsingSwitchNullCase(Object o) {
+        return switch (o) {
+            case String s -> Double.parseDouble(s);
+            case null -> 0d;
+            default -> 0d;
+        };
+    }
+
+    static double getDoubleUsingSwitchTotalType(Object o) {
+        return switch (o) {
+            case String s -> Double.parseDouble(s);
+            case Object ob -> 0d;
+        };
+    }
+
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/ParenthesizedPatterns.java

@@ -0,0 +1,29 @@
+package com.baeldung.switchpatterns;
+
+public class ParenthesizedPatterns {
+
+    static double getDoubleValueUsingIf(Object o) {
+        return switch (o) {
+            case String s -> {
+                if (s.length() > 0) {
+                    if (s.contains("#") || s.contains("@")) {
+                        yield 0d;
+                    } else {
+                        yield Double.parseDouble(s);
+                    }
+                } else {
+                    yield 0d;
+                }
+            }
+            default -> 0d;
+        };
+    }
+
+    static double getDoubleValueUsingParenthesizedPatterns(Object o) {
+        return switch (o) {
+            case String s && s.length() > 0 && !(s.contains("#") || s.contains("@")) -> Double.parseDouble(s);
+            default -> 0d;
+        };
+    }
+
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/PatternMatching.java

@@ -0,0 +1,14 @@
+package com.baeldung.switchpatterns;
+
+public class PatternMatching {
+
+    public static void main(String[] args) {
+        Object o = args[0];
+        if (o instanceof String s) {
+            System.out.printf("Object is a string %s", s);
+        } else if(o instanceof Number n) {
+            System.out.printf("Object is a number %n", n);
+        }
+    }
+
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/SwitchStatement.java

@@ -0,0 +1,14 @@
+package com.baeldung.switchpatterns;
+
+public class SwitchStatement {
+
+    public static void main(String[] args) {
+        final String b = "B";
+        switch (args[0]) {
+            case "A" -> System.out.println("Parameter is A");
+            case b -> System.out.println("Parameter is b");
+            default -> System.out.println("Parameter is unknown");
+        };
+    }
+
+}

core-java-modules/core-java-17/src/main/java/com/baeldung/switchpatterns/TypePatterns.java

@@ -0,0 +1,30 @@
+package com.baeldung.switchpatterns;
+
+public class TypePatterns {
+
+    static double getDoubleUsingIf(Object o) {
+        double result;
+
+        if (o instanceof Integer) {
+            result = ((Integer) o).doubleValue();
+        } else if (o instanceof Float) {
+            result = ((Float) o).doubleValue();
+        } else if (o instanceof String) {
+            result = Double.parseDouble(((String) o));
+        } else {
+            result = 0d;
+        }
+
+        return result;
+    }
+
+    static double getDoubleUsingSwitch(Object o) {
+        return switch (o) {
+            case Integer i -> i.doubleValue();
+            case Float f -> f.doubleValue();
+            case String s -> Double.parseDouble(s);
+            default -> 0d;
+        };
+    }
+
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/switchpatterns/GuardedPatternsUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.switchpatterns;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static com.baeldung.switchpatterns.GuardedPatterns.*;
+
+class GuardedPatternsUnitTest {
+
+    @Test
+    void givenIfImplementation_whenUsingEmptyString_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleValueUsingIf(""));
+    }
+
+    @Test
+    void givenIfImplementation_whenUsingNonEmptyString_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleValueUsingIf("10"));
+    }
+
+    @Test
+    void givenPatternsImplementation_whenUsingEmptyString_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleValueUsingGuardedPatterns(""));
+    }
+
+    @Test
+    void givenPatternsImplementation_whenUsingNonEmptyString_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleValueUsingGuardedPatterns("10"));
+    }
+
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/switchpatterns/HandlingNullValuesUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.switchpatterns;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static com.baeldung.switchpatterns.HandlingNullValues.*;
+
+class HandlingNullValuesUnitTest {
+
+    @Test
+    void givenNullCaseInSwitch_whenUsingStringAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingSwitchNullCase("10"));
+    }
+
+    @Test
+    void givenTotalTypeInSwitch_whenUsingNullArgument_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleUsingSwitchNullCase(null));
+    }
+
+    @Test
+    void givenTotalTypeInSwitch_whenUsingStringAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingSwitchTotalType("10"));
+    }
+
+    @Test
+    void givenNullCaseInSwitch_whenUsingNullArgument_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleUsingSwitchTotalType(null));
+    }
+
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/switchpatterns/ParenthesizedPatternsUnitTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.switchpatterns;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static com.baeldung.switchpatterns.ParenthesizedPatterns.*;
+
+class ParenthesizedPatternsUnitTest {
+
+    @Test
+    void givenIfImplementation_whenUsingEmptyString_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleValueUsingIf(""));
+    }
+
+    @Test
+    void givenIfImplementation_whenUsingNonEmptyString_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleValueUsingIf("10"));
+    }
+
+    @Test
+    void givenIfImplementation_whenStringContainsSpecialChar_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleValueUsingIf("@10"));
+    }
+
+    @Test
+    void givenPatternsImplementation_whenUsingEmptyString_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleValueUsingParenthesizedPatterns(""));
+    }
+
+    @Test
+    void givenPatternsImplementation_whenUsingNonEmptyString_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleValueUsingParenthesizedPatterns("10"));
+    }
+
+    @Test
+    void givenPatternsImplementation_whenStringContainsSpecialChar_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleValueUsingParenthesizedPatterns("@10"));
+    }
+
+}

core-java-modules/core-java-17/src/test/java/com/baeldung/switchpatterns/TypePatternsUnitTest.java

@@ -0,0 +1,49 @@
+package com.baeldung.switchpatterns;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static com.baeldung.switchpatterns.TypePatterns.*;
+
+class TypePatternsUnitTest {
+
+    @Test
+    void givenIfImplementation_whenUsingIntegerAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingIf(10));
+    }
+
+    @Test
+    void givenIfImplementation_whenUsingDoubleAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingIf(10.0f));
+    }
+
+    @Test
+    void givenIfImplementation_whenUsingStringAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingIf("10"));
+    }
+
+    @Test
+    void givenIfImplementation_whenUsingCharAsArgument_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleUsingIf('c'));
+    }
+
+    @Test
+    void givenSwitchImplementation_whenUsingIntegerAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingSwitch(10));
+    }
+
+    @Test
+    void givenSwitchImplementation_whenUsingDoubleAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingSwitch(10.0f));
+    }
+
+    @Test
+    void givenSwitchImplementation_whenUsingStringAsArgument_thenDoubleIsReturned() {
+        assertEquals(10d, getDoubleUsingSwitch("10"));
+    }
+
+    @Test
+    void givenSwitchImplementation_whenUsingCharAsArgument_thenDoubleIsReturned() {
+        assertEquals(0d, getDoubleUsingSwitch('c'));
+    }
+
+}

core-java-modules/core-java-8-2/pom.xml

@@ -7,12 +7,11 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-8-2</name>
     <packaging>jar</packaging>
-    
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

core-java-modules/core-java-8-datetime-2/pom.xml

@@ -7,12 +7,11 @@
     <version>${project.parent.version}</version>
     <name>core-java-8-datetime-2</name>
     <packaging>jar</packaging>
-    
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

core-java-modules/core-java-8-datetime/pom.xml

@@ -7,12 +7,11 @@
     <version>${project.parent.version}</version>
     <name>core-java-8-datetime</name>
     <packaging>jar</packaging>
-    
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

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

@@ -4,7 +4,6 @@ This module contains articles about Java 8 core features
 
 ### Relevant Articles: 
 - [New Features in Java 8](https://www.baeldung.com/java-8-new-features)
-- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
 - [Strategy Design Pattern in Java 8](https://www.baeldung.com/java-strategy-pattern)
 - [Guide to Java 8 Comparator.comparing()](https://www.baeldung.com/java-8-comparator-comparing)
 - [Guide to the Java 8 forEach](https://www.baeldung.com/foreach-java)

core-java-modules/core-java-8/pom.xml

@@ -7,12 +7,11 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-8</name>
     <packaging>jar</packaging>
-    
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

core-java-modules/core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/BlogPost.java

@@ -1,36 +0,0 @@
-package com.baeldung.java_8_features.groupingby;
-
-public class BlogPost {
-    private String title;
-    private String author;
-    private BlogPostType type;
-    private int likes;
-
-    public BlogPost(String title, String author, BlogPostType type, int likes) {
-        this.title = title;
-        this.author = author;
-        this.type = type;
-        this.likes = likes;
-    }
-
-    public String getTitle() {
-        return title;
-    }
-
-    public String getAuthor() {
-        return author;
-    }
-
-    public BlogPostType getType() {
-        return type;
-    }
-
-    public int getLikes() {
-        return likes;
-    }
-
-    @Override
-    public String toString() {
-        return "BlogPost{" + "title='" + title + '\'' + ", type=" + type + ", likes=" + likes + '}';
-    }
-}

core-java-modules/core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/BlogPostType.java

@@ -1,5 +0,0 @@
-package com.baeldung.java_8_features.groupingby;
-
-public enum BlogPostType {
-    NEWS, REVIEW, GUIDE
-}

core-java-modules/core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/Tuple.java

@@ -1,41 +0,0 @@
-package com.baeldung.java_8_features.groupingby;
-
-import java.util.Objects;
-
-public class Tuple {
-    private final BlogPostType type;
-    private final String author;
-
-    public Tuple(BlogPostType type, String author) {
-        this.type = type;
-        this.author = author;
-    }
-
-    public BlogPostType getType() {
-        return type;
-    }
-
-    public String getAuthor() {
-        return author;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o)
-            return true;
-        if (o == null || getClass() != o.getClass())
-            return false;
-        Tuple tuple = (Tuple) o;
-        return type == tuple.type && author.equals(tuple.author);
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(type, author);
-    }
-
-    @Override
-    public String toString() {
-        return "Tuple{" + "type=" + type + ", author='" + author + '\'' + '}';
-    }
-}

core-java-modules/core-java-8/src/test/java/com/baeldung/java_8_features/groupingby/Java8GroupingByCollectorUnitTest.java

@@ -1,215 +0,0 @@
-package com.baeldung.java_8_features.groupingby;
-
-import static java.util.Comparator.comparingInt;
-import static java.util.stream.Collectors.averagingInt;
-import static java.util.stream.Collectors.counting;
-import static java.util.stream.Collectors.groupingBy;
-import static java.util.stream.Collectors.groupingByConcurrent;
-import static java.util.stream.Collectors.joining;
-import static java.util.stream.Collectors.mapping;
-import static java.util.stream.Collectors.maxBy;
-import static java.util.stream.Collectors.summarizingInt;
-import static java.util.stream.Collectors.summingInt;
-import static java.util.stream.Collectors.toList;
-import static java.util.stream.Collectors.toSet;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-
-import java.util.Arrays;
-import java.util.EnumMap;
-import java.util.IntSummaryStatistics;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.ConcurrentMap;
-
-import org.junit.Test;
-
-public class Java8GroupingByCollectorUnitTest {
-
-    private static final List<BlogPost> posts = Arrays.asList(new BlogPost("News item 1", "Author 1", BlogPostType.NEWS, 15), new BlogPost("Tech review 1", "Author 2", BlogPostType.REVIEW, 5),
-        new BlogPost("Programming guide", "Author 1", BlogPostType.GUIDE, 20), new BlogPost("News item 2", "Author 2", BlogPostType.NEWS, 35), new BlogPost("Tech review 2", "Author 1", BlogPostType.REVIEW, 15));
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByType_thenGetAMapBetweenTypeAndPosts() {
-        Map<BlogPostType, List<BlogPost>> postsPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType));
-
-        assertEquals(2, postsPerType.get(BlogPostType.NEWS)
-            .size());
-        assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
-            .size());
-        assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
-            .size());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeAndTheirTitlesAreJoinedInAString_thenGetAMapBetweenTypeAndCsvTitles() {
-        Map<BlogPostType, String> postsPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, mapping(BlogPost::getTitle, joining(", ", "Post titles: [", "]"))));
-
-        assertEquals("Post titles: [News item 1, News item 2]", postsPerType.get(BlogPostType.NEWS));
-        assertEquals("Post titles: [Programming guide]", postsPerType.get(BlogPostType.GUIDE));
-        assertEquals("Post titles: [Tech review 1, Tech review 2]", postsPerType.get(BlogPostType.REVIEW));
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeAndSumTheLikes_thenGetAMapBetweenTypeAndPostLikes() {
-        Map<BlogPostType, Integer> likesPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, summingInt(BlogPost::getLikes)));
-
-        assertEquals(50, likesPerType.get(BlogPostType.NEWS)
-            .intValue());
-        assertEquals(20, likesPerType.get(BlogPostType.REVIEW)
-            .intValue());
-        assertEquals(20, likesPerType.get(BlogPostType.GUIDE)
-            .intValue());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeInAnEnumMap_thenGetAnEnumMapBetweenTypeAndPosts() {
-        EnumMap<BlogPostType, List<BlogPost>> postsPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, () -> new EnumMap<>(BlogPostType.class), toList()));
-
-        assertEquals(2, postsPerType.get(BlogPostType.NEWS)
-            .size());
-        assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
-            .size());
-        assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
-            .size());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeInSets_thenGetAMapBetweenTypesAndSetsOfPosts() {
-        Map<BlogPostType, Set<BlogPost>> postsPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, toSet()));
-
-        assertEquals(2, postsPerType.get(BlogPostType.NEWS)
-            .size());
-        assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
-            .size());
-        assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
-            .size());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeConcurrently_thenGetAMapBetweenTypeAndPosts() {
-        ConcurrentMap<BlogPostType, List<BlogPost>> postsPerType = posts.parallelStream()
-            .collect(groupingByConcurrent(BlogPost::getType));
-
-        assertEquals(2, postsPerType.get(BlogPostType.NEWS)
-            .size());
-        assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
-            .size());
-        assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
-            .size());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeAndAveragingLikes_thenGetAMapBetweenTypeAndAverageNumberOfLikes() {
-        Map<BlogPostType, Double> averageLikesPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, averagingInt(BlogPost::getLikes)));
-
-        assertEquals(25, averageLikesPerType.get(BlogPostType.NEWS)
-            .intValue());
-        assertEquals(20, averageLikesPerType.get(BlogPostType.GUIDE)
-            .intValue());
-        assertEquals(10, averageLikesPerType.get(BlogPostType.REVIEW)
-            .intValue());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeAndCounted_thenGetAMapBetweenTypeAndNumberOfPosts() {
-        Map<BlogPostType, Long> numberOfPostsPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, counting()));
-
-        assertEquals(2, numberOfPostsPerType.get(BlogPostType.NEWS)
-            .intValue());
-        assertEquals(1, numberOfPostsPerType.get(BlogPostType.GUIDE)
-            .intValue());
-        assertEquals(2, numberOfPostsPerType.get(BlogPostType.REVIEW)
-            .intValue());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeAndMaxingLikes_thenGetAMapBetweenTypeAndMaximumNumberOfLikes() {
-        Map<BlogPostType, Optional<BlogPost>> maxLikesPerPostType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, maxBy(comparingInt(BlogPost::getLikes))));
-
-        assertTrue(maxLikesPerPostType.get(BlogPostType.NEWS)
-            .isPresent());
-        assertEquals(35, maxLikesPerPostType.get(BlogPostType.NEWS)
-            .get()
-            .getLikes());
-
-        assertTrue(maxLikesPerPostType.get(BlogPostType.GUIDE)
-            .isPresent());
-        assertEquals(20, maxLikesPerPostType.get(BlogPostType.GUIDE)
-            .get()
-            .getLikes());
-
-        assertTrue(maxLikesPerPostType.get(BlogPostType.REVIEW)
-            .isPresent());
-        assertEquals(15, maxLikesPerPostType.get(BlogPostType.REVIEW)
-            .get()
-            .getLikes());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByAuthorAndThenByType_thenGetAMapBetweenAuthorAndMapsBetweenTypeAndBlogPosts() {
-        Map<String, Map<BlogPostType, List<BlogPost>>> map = posts.stream()
-            .collect(groupingBy(BlogPost::getAuthor, groupingBy(BlogPost::getType)));
-
-        assertEquals(1, map.get("Author 1")
-            .get(BlogPostType.NEWS)
-            .size());
-        assertEquals(1, map.get("Author 1")
-            .get(BlogPostType.GUIDE)
-            .size());
-        assertEquals(1, map.get("Author 1")
-            .get(BlogPostType.REVIEW)
-            .size());
-
-        assertEquals(1, map.get("Author 2")
-            .get(BlogPostType.NEWS)
-            .size());
-        assertEquals(1, map.get("Author 2")
-            .get(BlogPostType.REVIEW)
-            .size());
-        assertNull(map.get("Author 2")
-            .get(BlogPostType.GUIDE));
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByTypeAndSummarizingLikes_thenGetAMapBetweenTypeAndSummary() {
-        Map<BlogPostType, IntSummaryStatistics> likeStatisticsPerType = posts.stream()
-            .collect(groupingBy(BlogPost::getType, summarizingInt(BlogPost::getLikes)));
-
-        IntSummaryStatistics newsLikeStatistics = likeStatisticsPerType.get(BlogPostType.NEWS);
-
-        assertEquals(2, newsLikeStatistics.getCount());
-        assertEquals(50, newsLikeStatistics.getSum());
-        assertEquals(25.0, newsLikeStatistics.getAverage(), 0.001);
-        assertEquals(35, newsLikeStatistics.getMax());
-        assertEquals(15, newsLikeStatistics.getMin());
-    }
-
-    @Test
-    public void givenAListOfPosts_whenGroupedByComplexMapKeyType_thenGetAMapBetweenTupleAndList() {
-        Map<Tuple, List<BlogPost>> postsPerTypeAndAuthor = posts.stream()
-            .collect(groupingBy(post -> new Tuple(post.getType(), post.getAuthor())));
-
-        List<BlogPost> result = postsPerTypeAndAuthor.get(new Tuple(BlogPostType.GUIDE, "Author 1"));
-
-        assertThat(result.size()).isEqualTo(1);
-
-        BlogPost blogPost = result.get(0);
-
-        assertThat(blogPost.getTitle()).isEqualTo("Programming guide");
-        assertThat(blogPost.getType()).isEqualTo(BlogPostType.GUIDE);
-        assertThat(blogPost.getAuthor()).isEqualTo("Author 1");
-    }
-}

core-java-modules/core-java-9-improvements/pom.xml

@@ -40,7 +40,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
@@ -70,7 +70,6 @@
     <properties>
         <!-- testing -->
         <assertj.version>3.10.0</assertj.version>
-        <junit.platform.version>1.2.0</junit.platform.version>
         <awaitility.version>1.7.0</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

core-java-modules/core-java-9-new-features/README.md

@@ -6,7 +6,6 @@ This module contains articles about core Java features that have been introduced
 
 - [New Features in Java 9](https://www.baeldung.com/new-java-9)
 - [Java 9 Variable Handles Demystified](http://www.baeldung.com/java-variable-handles)
-- [Exploring the New HTTP Client in Java 9 and 11](http://www.baeldung.com/java-9-http-client)
 - [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
 - [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
 - [Introduction to Java 9 StackWalking API](https://www.baeldung.com/java-9-stackwalking-api)

core-java-modules/core-java-9-new-features/pom.xml

@@ -29,7 +29,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -39,7 +39,7 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
-    
+
     <profiles>
         <profile>
             <id>incubator-features</id>
@@ -131,7 +131,7 @@
             </build>
         </profile>
     </profiles>
-    
+
     <build>
         <finalName>core-java-9-new-features</finalName>
         <plugins>
@@ -158,7 +158,6 @@
         <rxjava.version>3.0.0</rxjava.version>
         <!-- testing -->
         <assertj.version>3.10.0</assertj.version>
-        <junit.platform.version>1.2.0</junit.platform.version>
         <awaitility.version>4.0.2</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

core-java-modules/core-java-9-new-features/src/modules/com.baeldung.httpclient/com/baeldung/httpclient/HttpClientExample.java

@@ -1,84 +0,0 @@
-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
-package com.baeldung.httpclient;
-
-import java.io.File;
-import java.io.IOException;
-import java.net.URI;
-import java.net.URISyntaxException;
-import java.nio.file.Paths;
-import java.util.Arrays;
-import java.util.List;
-import java.util.concurrent.CompletableFuture;
-import java.util.stream.Collectors;
-import jdk.incubator.http.HttpClient;
-import jdk.incubator.http.HttpRequest;
-import jdk.incubator.http.HttpRequest.BodyProcessor;
-import jdk.incubator.http.HttpResponse;
-import jdk.incubator.http.HttpResponse.BodyHandler;
-
-/**
- *
- * @author pkaria
- */
-public class HttpClientExample {
-    
-    public static void main(String[] args) throws Exception {
-        httpGetRequest();
-        httpPostRequest();
-        asynchronousRequest();
-        asynchronousMultipleRequests();
-    }
-
-    public static void httpGetRequest() throws URISyntaxException, IOException, InterruptedException {
-        HttpClient client = HttpClient.newHttpClient();
-        URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
-        HttpRequest request = HttpRequest.newBuilder(httpURI).GET()
-          .headers("Accept-Enconding", "gzip, deflate").build();
-        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandler.asString());
-        String responseBody = response.body();
-        int responseStatusCode = response.statusCode();
-        System.out.println(responseBody);
-    }
-
-    public static void httpPostRequest() throws URISyntaxException, IOException, InterruptedException {
-        HttpClient client = HttpClient
-                .newBuilder()
-                .build();
-        HttpRequest request = HttpRequest
-                .newBuilder(new URI("http://jsonplaceholder.typicode.com/posts"))
-                .POST(BodyProcessor.fromString("Sample Post Request"))
-                .build();
-        HttpResponse<String> response
-                = client.send(request, HttpResponse.BodyHandler.asString());
-        String responseBody = response.body();
-        System.out.println(responseBody);
-    }
-
-    public static void asynchronousRequest() throws URISyntaxException {
-        HttpClient client = HttpClient.newHttpClient();
-        URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
-        HttpRequest request = HttpRequest.newBuilder(httpURI).GET().build();
-        CompletableFuture<HttpResponse<String>> futureResponse = client.sendAsync(request,
-                HttpResponse.BodyHandler.asString());
-    }
-
-    public static void asynchronousMultipleRequests() throws URISyntaxException {
-        List<URI> targets = Arrays.asList(new URI("http://jsonplaceholder.typicode.com/posts/1"), new URI("http://jsonplaceholder.typicode.com/posts/2"));
-        HttpClient client = HttpClient.newHttpClient();
-        List<CompletableFuture<File>> futures = targets
-                .stream()
-                .map(target -> client
-                .sendAsync(
-                        HttpRequest.newBuilder(target)
-                                .GET()
-                                .build(),
-                        BodyHandler.asFile(Paths.get("base", target.getPath())))
-                .thenApply(response -> response.body())
-                .thenApply(path -> path.toFile()))
-                .collect(Collectors.toList());
-    }
-}

core-java-modules/core-java-9-new-features/src/modules/com.baeldung.httpclient/module-info.java

@@ -1,3 +0,0 @@
-module com.baeldung.httpclient {   
-	requires jdk.incubator.httpclient;
-}

core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientIntegrationTest.java

@@ -1,218 +0,0 @@
-package com.baeldung.java9.httpclient;
-
-import jdk.incubator.http.HttpClient;
-import jdk.incubator.http.HttpRequest;
-import jdk.incubator.http.HttpResponse;
-import org.junit.Test;
-
-import java.io.IOException;
-import java.net.*;
-import java.util.Arrays;
-import java.util.List;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.stream.Collectors;
-
-import static org.hamcrest.CoreMatchers.containsString;
-import static org.hamcrest.CoreMatchers.equalTo;
-import static org.hamcrest.collection.IsEmptyCollection.empty;
-import static org.hamcrest.core.IsNot.not;
-import static org.junit.Assert.assertThat;
-
-/**
- * Created by adam.
- */
-public class HttpClientIntegrationTest {
-
-    @Test
-    public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .headers("Content-Type", "text/plain;charset=UTF-8")
-            .POST(HttpRequest.BodyProcessor.fromString("Sample body"))
-            .build();
-
-        HttpResponse<String> response = HttpClient.newBuilder()
-            .proxy(ProxySelector.getDefault())
-            .build()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.body(), containsString("Sample body"));
-    }
-
-    @Test
-    public void shouldNotFollowRedirectWhenSetToDefaultNever() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("http://stackoverflow.com"))
-            .version(HttpClient.Version.HTTP_1_1)
-            .GET()
-            .build();
-        HttpResponse<String> response = HttpClient.newBuilder()
-            .build()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_MOVED_PERM));
-        assertThat(response.body(), containsString(""));
-    }
-
-    @Test
-    public void shouldFollowRedirectWhenSetToAlways() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("http://stackoverflow.com"))
-            .version(HttpClient.Version.HTTP_1_1)
-            .GET()
-            .build();
-        HttpResponse<String> response = HttpClient.newBuilder()
-            .followRedirects(HttpClient.Redirect.ALWAYS)
-            .build()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.finalRequest()
-            .uri()
-            .toString(), equalTo("https://stackoverflow.com/"));
-    }
-
-    @Test
-    public void shouldReturnOKStatusForAuthenticatedAccess() throws URISyntaxException, IOException, InterruptedException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/basic-auth"))
-            .GET()
-            .build();
-        HttpResponse<String> response = HttpClient.newBuilder()
-            .authenticator(new Authenticator() {
-                @Override
-                protected PasswordAuthentication getPasswordAuthentication() {
-                    return new PasswordAuthentication("postman", "password".toCharArray());
-                }
-            })
-            .build()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldSendRequestAsync() throws URISyntaxException, InterruptedException, ExecutionException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .headers("Content-Type", "text/plain;charset=UTF-8")
-            .POST(HttpRequest.BodyProcessor.fromString("Sample body"))
-            .build();
-        CompletableFuture<HttpResponse<String>> response = HttpClient.newBuilder()
-            .build()
-            .sendAsync(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.get()
-            .statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldUseJustTwoThreadWhenProcessingSendAsyncRequest() throws URISyntaxException, InterruptedException, ExecutionException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .GET()
-            .build();
-
-        ExecutorService executorService = Executors.newFixedThreadPool(2);
-
-        CompletableFuture<HttpResponse<String>> response1 = HttpClient.newBuilder()
-            .executor(executorService)
-            .build()
-            .sendAsync(request, HttpResponse.BodyHandler.asString());
-
-        CompletableFuture<HttpResponse<String>> response2 = HttpClient.newBuilder()
-            .executor(executorService)
-            .build()
-            .sendAsync(request, HttpResponse.BodyHandler.asString());
-
-        CompletableFuture<HttpResponse<String>> response3 = HttpClient.newBuilder()
-            .executor(executorService)
-            .build()
-            .sendAsync(request, HttpResponse.BodyHandler.asString());
-
-        CompletableFuture.allOf(response1, response2, response3)
-            .join();
-
-        assertThat(response1.get()
-            .statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response2.get()
-            .statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response3.get()
-            .statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldNotStoreCookieWhenPolicyAcceptNone() throws URISyntaxException, IOException, InterruptedException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .GET()
-            .build();
-
-        HttpClient httpClient = HttpClient.newBuilder()
-            .cookieManager(new CookieManager(null, CookiePolicy.ACCEPT_NONE))
-            .build();
-
-        httpClient.send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(httpClient.cookieManager()
-            .get()
-            .getCookieStore()
-            .getCookies(), empty());
-    }
-
-    @Test
-    public void shouldStoreCookieWhenPolicyAcceptAll() throws URISyntaxException, IOException, InterruptedException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .GET()
-            .build();
-
-        HttpClient httpClient = HttpClient.newBuilder()
-            .cookieManager(new CookieManager(null, CookiePolicy.ACCEPT_ALL))
-            .build();
-
-        httpClient.send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(httpClient.cookieManager()
-            .get()
-            .getCookieStore()
-            .getCookies(), not(empty()));
-    }
-
-    @Test
-    public void shouldProcessMultipleRequestViaStream() throws URISyntaxException, ExecutionException, InterruptedException {
-        List<URI> targets = Arrays.asList(new URI("https://postman-echo.com/get?foo1=bar1"), new URI("https://postman-echo.com/get?foo2=bar2"));
-
-        HttpClient client = HttpClient.newHttpClient();
-
-        List<CompletableFuture<String>> futures = targets.stream()
-            .map(target -> client.sendAsync(HttpRequest.newBuilder(target)
-                .GET()
-                .build(), HttpResponse.BodyHandler.asString())
-                .thenApply(response -> response.body()))
-            .collect(Collectors.toList());
-
-        CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
-            .join();
-
-        if (futures.get(0)
-            .get()
-            .contains("foo1")) {
-            assertThat(futures.get(0)
-                .get(), containsString("bar1"));
-            assertThat(futures.get(1)
-                .get(), containsString("bar2"));
-        } else {
-            assertThat(futures.get(1)
-                .get(), containsString("bar2"));
-            assertThat(futures.get(1)
-                .get(), containsString("bar1"));
-        }
-
-    }
-
-}

core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestIntegrationTest.java

@@ -1,171 +0,0 @@
-package com.baeldung.java9.httpclient;
-
-import jdk.incubator.http.HttpClient;
-import jdk.incubator.http.HttpRequest;
-import jdk.incubator.http.HttpResponse;
-import org.junit.Test;
-
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.net.HttpURLConnection;
-import java.net.URI;
-import java.net.URISyntaxException;
-import java.nio.file.Paths;
-import java.security.NoSuchAlgorithmException;
-import java.time.Duration;
-
-import static java.time.temporal.ChronoUnit.SECONDS;
-import static org.hamcrest.CoreMatchers.containsString;
-import static org.hamcrest.CoreMatchers.equalTo;
-import static org.junit.Assert.assertThat;
-
-/**
- * Created by adam.
- */
-public class HttpRequestIntegrationTest {
-
-    @Test
-    public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .GET()
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldUseHttp2WhenWebsiteUsesHttp2() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://stackoverflow.com"))
-            .version(HttpClient.Version.HTTP_2)
-            .GET()
-            .build();
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.version(), equalTo(HttpClient.Version.HTTP_2));
-    }
-
-    @Test
-    public void shouldFallbackToHttp1_1WhenWebsiteDoesNotUseHttp2() throws IOException, InterruptedException, URISyntaxException, NoSuchAlgorithmException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .version(HttpClient.Version.HTTP_2)
-            .GET()
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.version(), equalTo(HttpClient.Version.HTTP_1_1));
-    }
-
-    @Test
-    public void shouldReturnStatusOKWhenSendGetRequestWithDummyHeaders() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .headers("key1", "value1", "key2", "value2")
-            .GET()
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldReturnStatusOKWhenSendGetRequestTimeoutSet() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .timeout(Duration.of(10, SECONDS))
-            .GET()
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldReturnNoContentWhenPostWithNoBody() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .POST(HttpRequest.noBody())
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-    }
-
-    @Test
-    public void shouldReturnSampleDataContentWhenPostWithBodyText() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .headers("Content-Type", "text/plain;charset=UTF-8")
-            .POST(HttpRequest.BodyProcessor.fromString("Sample request body"))
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.body(), containsString("Sample request body"));
-    }
-
-    @Test
-    public void shouldReturnSampleDataContentWhenPostWithInputStream() throws IOException, InterruptedException, URISyntaxException {
-        byte[] sampleData = "Sample request body".getBytes();
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .headers("Content-Type", "text/plain;charset=UTF-8")
-            .POST(HttpRequest.BodyProcessor.fromInputStream(() -> new ByteArrayInputStream(sampleData)))
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.body(), containsString("Sample request body"));
-    }
-
-    @Test
-    public void shouldReturnSampleDataContentWhenPostWithByteArrayProcessorStream() throws IOException, InterruptedException, URISyntaxException {
-        byte[] sampleData = "Sample request body".getBytes();
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .headers("Content-Type", "text/plain;charset=UTF-8")
-            .POST(HttpRequest.BodyProcessor.fromByteArray(sampleData))
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.body(), containsString("Sample request body"));
-    }
-
-    @Test
-    public void shouldReturnSampleDataContentWhenPostWithFileProcessorStream() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/post"))
-            .headers("Content-Type", "text/plain;charset=UTF-8")
-            .POST(HttpRequest.BodyProcessor.fromFile(Paths.get("src/test/resources/sample.txt")))
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.body(), containsString("Sample file content"));
-    }
-
-}

core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseIntegrationTest.java

@@ -1,55 +0,0 @@
-package com.baeldung.java9.httpclient;
-
-import jdk.incubator.http.HttpClient;
-import jdk.incubator.http.HttpRequest;
-import jdk.incubator.http.HttpResponse;
-import org.junit.Test;
-
-import java.io.IOException;
-import java.net.HttpURLConnection;
-import java.net.URI;
-import java.net.URISyntaxException;
-
-import static org.hamcrest.CoreMatchers.equalTo;
-import static org.hamcrest.Matchers.isEmptyString;
-import static org.hamcrest.core.IsNot.not;
-import static org.junit.Assert.assertThat;
-
-/**
- * Created by adam.
- */
-public class HttpResponseIntegrationTest {
-
-    @Test
-    public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("https://postman-echo.com/get"))
-            .GET()
-            .build();
-
-        HttpResponse<String> response = HttpClient.newHttpClient()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
-        assertThat(response.body(), not(isEmptyString()));
-    }
-
-    @Test
-    public void shouldResponseURIDifferentThanRequestUIRWhenRedirect() throws IOException, InterruptedException, URISyntaxException {
-        HttpRequest request = HttpRequest.newBuilder()
-            .uri(new URI("http://stackoverflow.com"))
-            .version(HttpClient.Version.HTTP_1_1)
-            .GET()
-            .build();
-        HttpResponse<String> response = HttpClient.newBuilder()
-            .followRedirects(HttpClient.Redirect.ALWAYS)
-            .build()
-            .send(request, HttpResponse.BodyHandler.asString());
-
-        assertThat(request.uri()
-            .toString(), equalTo("http://stackoverflow.com"));
-        assertThat(response.uri()
-            .toString(), equalTo("https://stackoverflow.com/"));
-    }
-
-}

core-java-modules/core-java-9/pom.xml

@@ -35,7 +35,7 @@
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
+            <version>${junit-platform.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -80,7 +80,6 @@
     <properties>
         <!-- testing -->
         <assertj.version>3.10.0</assertj.version>
-        <junit.platform.version>1.2.0</junit.platform.version>
         <awaitility.version>1.7.0</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

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

@@ -12,3 +12,4 @@
 - [Efficient Word Frequency Calculator in Java](https://www.baeldung.com/java-word-frequency)
 - [Why Missing Annotations Don’t Cause ClassNotFoundException](https://www.baeldung.com/classnotfoundexception-missing-annotation)
 - [Valid @SuppressWarnings Warning Names](https://www.baeldung.com/java-suppresswarnings-valid-names)
+- [Get a Field’s Annotations Using Reflection](https://www.baeldung.com/java-get-field-annotations)

core-java-modules/core-java-annotations/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-annotations</artifactId>
     <version>0.1.0-SNAPSHOT</version>
@@ -12,9 +12,21 @@
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../</relativePath>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+
     <build>
         <finalName>core-java-annotations</finalName>
         <resources>

core-java-modules/core-java-annotations/src/main/java/com/baeldung/readannotations/ClassWithAnnotations.java

@@ -0,0 +1,9 @@
+package com.baeldung.readannotations;
+
+public class ClassWithAnnotations {
+
+    @FirstAnnotation
+    @SecondAnnotation
+    @ThirdAnnotation
+    private String classMember;
+}