Merge branch 'master' into master

libraries-2/README.md

@@ -18,5 +18,5 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Guide to MapDB](https://www.baeldung.com/mapdb)
 - [A Guide to Apache Mesos](https://www.baeldung.com/apache-mesos)
 - [JasperReports with Spring](https://www.baeldung.com/spring-jasper)
-- More articles [[<-- prev]](/libraries)
+- More articles [[<-- prev]](/libraries) [[next -->]](/libraries-3)
 

libraries-3/README.md

@@ -16,3 +16,5 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Introduction to Takes](https://www.baeldung.com/java-takes)
 - [Using NullAway to Avoid NullPointerExceptions](https://www.baeldung.com/java-nullaway)
 - [Introduction to Alibaba Arthas](https://www.baeldung.com/java-alibaba-arthas-intro)
+- [Quick Guide to Spring Cloud Circuit Breaker](https://www.baeldung.com/spring-cloud-circuit-breaker)
+- More articles [[<-- prev]](/libraries-2) [[next -->]](/libraries-4)

libraries-4/README.md

@@ -0,0 +1,21 @@
+## Libraries-4
+
+This module contains articles about various Java libraries. 
+These are small libraries that are relatively easy to use and do not require any separate module of their own.
+
+The code examples related to different libraries are each in their own module.
+
+Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-modules) we already have separate modules. Please make sure to have a look at the existing modules in such cases.
+
+### Relevant articles
+- [Quick Guide to RSS with Rome](https://www.baeldung.com/rome-rss)
+- [Introduction to PCollections](https://www.baeldung.com/java-pcollections)
+- [Introduction to Eclipse Collections](https://www.baeldung.com/eclipse-collections)
+- [DistinctBy in the Java Stream API](https://www.baeldung.com/java-streams-distinct-by)
+- [Introduction to NoException](https://www.baeldung.com/no-exception)
+- [Spring Yarg Integration](https://www.baeldung.com/spring-yarg)
+- [Delete a Directory Recursively in Java](https://www.baeldung.com/java-delete-directory)
+- [Guide to JDeferred](https://www.baeldung.com/jdeferred)
+- [Introduction to MBassador](https://www.baeldung.com/mbassador)
+- [Using Pairs in Java](https://www.baeldung.com/java-pairs)
+- More articles [[<-- prev]](/libraries-3) [[next -->]](/libraries-5)

libraries-4/pom.xml

@@ -0,0 +1,116 @@
+<?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">
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>libraries-4</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jdeferred</groupId>
+            <artifactId>jdeferred-core</artifactId>
+            <version>${jdeferred.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections</artifactId>
+            <version>${eclipse-collections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.haulmont.yarg</groupId>
+            <artifactId>yarg</artifactId>
+            <version>${yarg.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>net.engio</groupId>
+            <artifactId>mbassador</artifactId>
+            <version>${mbassador.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.machinezoo.noexception</groupId>
+            <artifactId>noexception</artifactId>
+            <version>${noexception.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>rome</groupId>
+            <artifactId>rome</artifactId>
+            <version>${rome.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-web</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.datanucleus</groupId>
+            <artifactId>javax.jdo</artifactId>
+            <version>${javax.jdo.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>servlet-api</artifactId>
+            <version>${javax.servlet.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vavr</groupId>
+            <artifactId>vavr</artifactId>
+            <version>${vavr.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.pcollections</groupId>
+            <artifactId>pcollections</artifactId>
+            <version>${pcollections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <version>${awaitility.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>one.util</groupId>
+            <artifactId>streamex</artifactId>
+            <version>${streamex.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.el</groupId>
+            <artifactId>javax.el-api</artifactId>
+            <version>${javax.el.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish.web</groupId>
+            <artifactId>javax.el</artifactId>
+            <version>2.2.4</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <jdeferred.version>1.2.6</jdeferred.version>
+        <eclipse-collections.version>8.2.0</eclipse-collections.version>
+        <noexception.version>1.1.0</noexception.version>
+        <yarg.version>2.0.12</yarg.version>
+        <mbassador.version>1.3.1</mbassador.version>
+        <rome.version>1.0</rome.version>
+        <spring.version>4.3.8.RELEASE</spring.version>
+        <javax.servlet.version>2.5</javax.servlet.version>
+        <javax.jdo.version>3.2.0-m7</javax.jdo.version>
+        <vavr.version>0.9.0</vavr.version>
+        <assertj.version>3.6.2</assertj.version>
+        <pcollections.version>2.1.2</pcollections.version>
+        <awaitility.version>3.0.0</awaitility.version>
+        <streamex.version>0.6.5</streamex.version>
+        <javax.el.version>3.0.0</javax.el.version>
+    </properties>
+
+</project>

libraries-4/src/test/java/com/baeldung/eclipsecollections/ForEachPatternUnitTest.java

@@ -5,6 +5,7 @@ import static org.junit.Assert.assertEquals;
 import org.eclipse.collections.api.tuple.Pair;
 import org.eclipse.collections.impl.map.mutable.UnifiedMap;
 import org.eclipse.collections.impl.tuple.Tuples;
+import org.junit.Assert;
 import org.junit.Test;
 
 public class ForEachPatternUnitTest {
@@ -23,7 +24,7 @@ public class ForEachPatternUnitTest {
         }
 
         for (int i = 0; i < map.size(); i++) {
-            assertEquals("New Value", map.get(i + 1));
+            Assert.assertEquals("New Value", map.get(i + 1));
         }
     }
 }

libraries-4/src/test/java/com/baeldung/io/JavaDirectoryDeleteUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.io;
+package com.baeldung.io;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;

libraries-5/README.md

@@ -0,0 +1,21 @@
+## Libraries-5
+
+This module contains articles about various Java libraries. 
+These are small libraries that are relatively easy to use and do not require any separate module of their own.
+
+The code examples related to different libraries are each in their own module.
+
+Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-modules) we already have separate modules. Please make sure to have a look at the existing modules in such cases.
+
+### Relevant articles
+- [Introduction to Caffeine](https://www.baeldung.com/java-caching-caffeine)
+- [Introduction to StreamEx](https://www.baeldung.com/streamex)
+- [A Docker Guide for Java](https://www.baeldung.com/docker-java-api)
+- [Introduction to Akka Actors in Java](https://www.baeldung.com/akka-actors-java)
+- [A Guide to Byte Buddy](https://www.baeldung.com/byte-buddy)
+- [Introduction to jOOL](https://www.baeldung.com/jool)
+- [Consumer Driven Contracts with Pact](https://www.baeldung.com/pact-junit-consumer-driven-contracts)
+- [Introduction to Atlassian Fugue](https://www.baeldung.com/java-fugue)
+- [Publish and Receive Messages with Nats Java Client](https://www.baeldung.com/nats-java-client)
+- [Java Concurrency Utility with JCTools](https://www.baeldung.com/java-concurrency-jc-tools)
+- More articles [[<-- prev]](/libraries-4) [[next -->]](/libraries-6)

libraries-5/pom.xml

@@ -0,0 +1,146 @@
+<?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">
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>libraries-5</artifactId>
+    <modelVersion>4.0.0</modelVersion>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-web</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jooq</groupId>
+            <artifactId>jool</artifactId>
+            <version>${jool.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>au.com.dius</groupId>
+            <artifactId>pact-jvm-consumer-junit_2.11</artifactId>
+            <version>${pact.version}</version>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.codehaus.groovy</groupId>
+                    <artifactId>groovy-all</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+
+        <!-- https://mvnrepository.com/artifact/com.typesafe.akka/akka-actor -->
+        <dependency>
+            <groupId>com.typesafe.akka</groupId>
+            <artifactId>akka-actor_${scala.version}</artifactId>
+            <version>${typesafe-akka.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.typesafe.akka</groupId>
+            <artifactId>akka-testkit_${scala.version}</artifactId>
+            <version>${typesafe-akka.version}</version>
+            <scope>test</scope>
+
+        </dependency>
+                <dependency>
+                    <groupId>one.util</groupId>
+                    <artifactId>streamex</artifactId>
+                    <version>${streamex.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy</artifactId>
+            <version>${bytebuddy.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy-agent</artifactId>
+            <version>${bytebuddy.version}</version>
+        </dependency>
+
+        <!--Java Docker API Client -->
+        <dependency>
+            <groupId>com.github.docker-java</groupId>
+            <artifactId>docker-java</artifactId>
+            <version>${docker.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-log4j12</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>jcl-over-slf4j</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>ch.qos.logback</groupId>
+                    <artifactId>logback-classic</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <!--Java Docker API Client -->
+
+        <dependency>
+            <groupId>com.github.ben-manes.caffeine</groupId>
+            <artifactId>caffeine</artifactId>
+            <version>${caffeine.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>${findbugs.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <!-- Atlassian Fugue -->
+        <dependency>
+            <groupId>io.atlassian.fugue</groupId>
+            <artifactId>fugue</artifactId>
+            <version>${fugue.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.nats</groupId>
+            <artifactId>jnats</artifactId>
+            <version>${jnats.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jctools</groupId>
+            <artifactId>jctools-core</artifactId>
+            <version>${jctools.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <pact.version>3.5.0</pact.version>
+        <jool.version>0.9.12</jool.version>
+        <spring.version>4.3.8.RELEASE</spring.version>
+        <assertj.version>3.6.2</assertj.version>
+        <scala.version>2.11</scala.version>
+        <typesafe-akka.version>2.5.11</typesafe-akka.version>
+        <streamex.version>0.6.5</streamex.version>
+        <bytebuddy.version>1.7.1</bytebuddy.version>
+        <docker.version>3.0.14</docker.version>
+        <caffeine.version>2.5.5</caffeine.version>
+        <findbugs.version>3.0.2</findbugs.version>
+        <fugue.version>4.5.1</fugue.version>
+        <jnats.version>1.0</jnats.version>
+        <jctools.version>2.1.2</jctools.version>
+        <jmh.version>1.19</jmh.version>
+    </properties>
+
+</project>

libraries-5/src/test/java/com/baeldung/caffeine/CaffeineUnitTest.java

@@ -8,6 +8,7 @@ import java.util.concurrent.TimeUnit;
 
 import javax.annotation.Nonnull;
 
+import org.junit.Assert;
 import org.junit.Test;
 
 import com.github.benmanes.caffeine.cache.*;
@@ -65,43 +66,43 @@ public class CaffeineUnitTest {
             assertEquals("Data for " + key, dataObject.getData());
         });
 
-        cache.getAll(Arrays.asList("A", "B", "C")).thenAccept(dataObjectMap -> assertEquals(3, dataObjectMap.size()));
+        cache.getAll(Arrays.asList("A", "B", "C")).thenAccept(dataObjectMap -> Assert.assertEquals(3, dataObjectMap.size()));
     }
 
     @Test
     public void givenLoadingCacheWithSmallSize_whenPut_thenSizeIsConstant() {
         LoadingCache<String, DataObject> cache = Caffeine.newBuilder().maximumSize(1).refreshAfterWrite(10, TimeUnit.MINUTES).build(k -> DataObject.get("Data for " + k));
 
-        assertEquals(0, cache.estimatedSize());
+        Assert.assertEquals(0, cache.estimatedSize());
 
         cache.get("A");
 
-        assertEquals(1, cache.estimatedSize());
+        Assert.assertEquals(1, cache.estimatedSize());
 
         cache.get("B");
         cache.cleanUp();
 
-        assertEquals(1, cache.estimatedSize());
+        Assert.assertEquals(1, cache.estimatedSize());
     }
 
     @Test
     public void givenLoadingCacheWithWeigher_whenPut_thenSizeIsConstant() {
         LoadingCache<String, DataObject> cache = Caffeine.newBuilder().maximumWeight(10).weigher((k, v) -> 5).build(k -> DataObject.get("Data for " + k));
 
-        assertEquals(0, cache.estimatedSize());
+        Assert.assertEquals(0, cache.estimatedSize());
 
         cache.get("A");
 
-        assertEquals(1, cache.estimatedSize());
+        Assert.assertEquals(1, cache.estimatedSize());
 
         cache.get("B");
 
-        assertEquals(2, cache.estimatedSize());
+        Assert.assertEquals(2, cache.estimatedSize());
 
         cache.get("C");
         cache.cleanUp();
 
-        assertEquals(2, cache.estimatedSize());
+        Assert.assertEquals(2, cache.estimatedSize());
     }
 
     @Test
@@ -138,7 +139,7 @@ public class CaffeineUnitTest {
         cache.get("A");
         cache.get("A");
 
-        assertEquals(1, cache.stats().hitCount());
+        Assert.assertEquals(1, cache.stats().hitCount());
-        assertEquals(1, cache.stats().missCount());
+        Assert.assertEquals(1, cache.stats().missCount());
     }
 }

libraries-5/src/test/java/com/baeldung/dockerapi/ContainerLiveTest.java

@@ -6,6 +6,8 @@ import com.github.dockerjava.api.command.InspectContainerResponse;
 import com.github.dockerjava.api.model.Container;
 import com.github.dockerjava.api.model.PortBinding;
 import com.github.dockerjava.core.DockerClientBuilder;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.Is;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -51,7 +53,7 @@ public class ContainerLiveTest {
         CreateContainerResponse container = dockerClient.createContainerCmd("mongo:3.6").withCmd("--bind_ip_all").withName("mongo").withHostName("baeldung").withEnv("MONGO_LATEST_VERSION=3.6").withPortBindings(PortBinding.parse("9999:27017")).exec();
 
         // then
-        assertThat(container.getId(), is(not(null)));
+        MatcherAssert.assertThat(container.getId(), is(not(null)));
     }
 
     @Test
@@ -104,7 +106,7 @@ public class ContainerLiveTest {
         // then
         InspectContainerResponse containerResponse = dockerClient.inspectContainerCmd(container.getId()).exec();
 
-        assertThat(containerResponse.getId(), is(container.getId()));
+        MatcherAssert.assertThat(containerResponse.getId(), Is.is(container.getId()));
     }
 
     @Test

libraries-5/src/test/java/com/baeldung/dockerapi/ImageLiveTest.java

@@ -8,6 +8,8 @@ import com.github.dockerjava.core.DockerClientBuilder;
 import com.github.dockerjava.core.command.BuildImageResultCallback;
 import com.github.dockerjava.core.command.PullImageResultCallback;
 import com.github.dockerjava.core.command.PushImageResultCallback;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.core.Is;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -81,7 +83,7 @@ public class ImageLiveTest {
         InspectImageResponse imageResponse = dockerClient.inspectImageCmd(image.getId()).exec();
 
         // then
-        assertThat(imageResponse.getId(), is(image.getId()));
+        MatcherAssert.assertThat(imageResponse.getId(), Is.is(image.getId()));
     }
 
     @Test

libraries-5/src/test/java/com/baeldung/dockerapi/NetworkLiveTest.java

@@ -5,6 +5,7 @@ import com.github.dockerjava.api.command.CreateNetworkResponse;
 import com.github.dockerjava.api.model.Network;
 import com.github.dockerjava.api.model.Network.Ipam;
 import com.github.dockerjava.core.DockerClientBuilder;
+import org.hamcrest.MatcherAssert;
 import org.junit.BeforeClass;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -64,7 +65,7 @@ public class NetworkLiveTest {
         Network network = dockerClient.inspectNetworkCmd().withNetworkId(networkName).exec();
 
         // then
-        assertThat(network.getName(), is(networkName));
+        MatcherAssert.assertThat(network.getName(), is(networkName));
     }
 
     @Test

libraries-5/src/test/java/com/baeldung/dockerapi/VolumeLiveTest.java

@@ -5,6 +5,7 @@ import com.github.dockerjava.api.command.CreateVolumeResponse;
 import com.github.dockerjava.api.command.InspectVolumeResponse;
 import com.github.dockerjava.api.command.ListVolumesResponse;
 import com.github.dockerjava.core.DockerClientBuilder;
+import org.hamcrest.MatcherAssert;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -57,7 +58,7 @@ public class VolumeLiveTest {
         CreateVolumeResponse unnamedVolume = dockerClient.createVolumeCmd().exec();
 
         // then
-        assertThat(unnamedVolume.getName(), is(not(null)));
+        MatcherAssert.assertThat(unnamedVolume.getName(), is(not(null)));
     }
 
     @Test
@@ -67,7 +68,7 @@ public class VolumeLiveTest {
         CreateVolumeResponse namedVolume = dockerClient.createVolumeCmd().withName("myNamedVolume").exec();
 
         // then
-        assertThat(namedVolume.getName(), is(not(null)));
+        MatcherAssert.assertThat(namedVolume.getName(), is(not(null)));
     }
 
     @Test

libraries-5/src/test/java/com/baeldung/fugue/FugueUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.atlassian.fugue;
+package com.baeldung.fugue;
 
 import io.atlassian.fugue.*;
 import org.junit.Assert;

libraries-5/src/test/java/com/baeldung/jctools/JCToolsUnitTest.java

@@ -1,5 +1,6 @@
 package com.baeldung.jctools;
 
+import org.assertj.core.api.Assertions;
 import org.jctools.queues.SpscArrayQueue;
 import org.jctools.queues.SpscChunkedArrayQueue;
 import org.junit.Test;
@@ -44,16 +45,16 @@ public class JCToolsUnitTest {
     @Test
     public void whenQueueIsFull_thenNoMoreElementsCanBeAdded() throws InterruptedException {
         SpscChunkedArrayQueue<Integer> queue = new SpscChunkedArrayQueue<>(8, 16);
-        assertThat(queue.capacity()).isEqualTo(16);
+        Assertions.assertThat(queue.capacity()).isEqualTo(16);
 
         CountDownLatch startConsuming = new CountDownLatch(1);
         CountDownLatch awakeProducer = new CountDownLatch(1);
         AtomicReference<Throwable> error = new AtomicReference<>();
         Thread producer = new Thread(() -> {
             IntStream.range(0, queue.capacity()).forEach(i -> {
-                assertThat(queue.offer(i)).isTrue();
+                Assertions.assertThat(queue.offer(i)).isTrue();
             });
-            assertThat(queue.offer(queue.capacity())).isFalse();
+            Assertions.assertThat(queue.offer(queue.capacity())).isFalse();
             startConsuming.countDown();
             try {
                 awakeProducer.await();
@@ -61,7 +62,7 @@ public class JCToolsUnitTest {
                 throw new RuntimeException(e);
             }
 
-            assertThat(queue.offer(queue.capacity())).isTrue();
+            Assertions.assertThat(queue.offer(queue.capacity())).isTrue();
         });
         producer.setUncaughtExceptionHandler((t, e) -> {
             error.set(e);

libraries-5/src/test/java/com/baeldung/streamex/StreamExMergeStreamsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.stream;
+package com.baeldung.streamex;
 
 import one.util.streamex.StreamEx;
 import org.junit.Test;

libraries-6/README.md

@@ -0,0 +1,17 @@
+## Libraries-6
+
+This module contains articles about various Java libraries. 
+These are small libraries that are relatively easy to use and do not require any separate module of their own.
+
+The code examples related to different libraries are each in their own module.
+
+Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-modules) we already have separate modules. Please make sure to have a look at the existing modules in such cases.
+
+### Relevant articles
+- [Introduction to JavaPoet](https://www.baeldung.com/java-poet)
+- [Guide to Resilience4j](https://www.baeldung.com/resilience4j)
+- [Implementing a FTP-Client in Java](https://www.baeldung.com/java-ftp-client)
+- [Introduction to Functional Java](https://www.baeldung.com/java-functional-library)
+- [A Guide to the Reflections Library](https://www.baeldung.com/reflections-library)
+- [Exactly Once Processing in Kafka](https://www.baeldung.com/kafka-exactly-once)
+- More articles [[<-- prev]](/libraries-5)

libraries-6/pom.xml

@@ -0,0 +1,111 @@
+<?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">
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>libraries-6</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.functionaljava</groupId>
+            <artifactId>functionaljava-java8</artifactId>
+            <version>${functionaljava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.codepoetics</groupId>
+            <artifactId>protonpack</artifactId>
+            <version>${protonpack.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.kafka</groupId>
+            <artifactId>kafka-streams</artifactId>
+            <version>${kafka.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.kafka</groupId>
+            <artifactId>kafka-clients</artifactId>
+            <version>${kafka.version}</version>
+            <classifier>test</classifier>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.github.resilience4j</groupId>
+            <artifactId>resilience4j-circuitbreaker</artifactId>
+            <version>${resilience4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.github.resilience4j</groupId>
+            <artifactId>resilience4j-bulkhead</artifactId>
+            <version>${resilience4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.github.resilience4j</groupId>
+            <artifactId>resilience4j-retry</artifactId>
+            <version>${resilience4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.github.resilience4j</groupId>
+            <artifactId>resilience4j-timelimiter</artifactId>
+            <version>${resilience4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup</groupId>
+            <artifactId>javapoet</artifactId>
+            <version>${javapoet.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.mockftpserver</groupId>
+            <artifactId>MockFtpServer</artifactId>
+            <version>${mockftpserver.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <!-- Reflections -->
+        <dependency>
+            <groupId>org.reflections</groupId>
+            <artifactId>reflections</artifactId>
+            <version>${reflections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>commons-net</groupId>
+            <artifactId>commons-net</artifactId>
+            <version>${commons-net.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commonsio.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <kafka.version>2.0.0</kafka.version>
+        <javapoet.version>1.10.0</javapoet.version>
+        <reflections.version>0.9.11</reflections.version>
+        <mockftpserver.version>2.7.1</mockftpserver.version>
+        <functionaljava.version>4.8.1</functionaljava.version>
+        <resilience4j.version>0.12.1</resilience4j.version>
+        <protonpack.version>1.15</protonpack.version>
+        <commons-net.version>3.6</commons-net.version>
+        <assertj.version>3.6.2</assertj.version>
+        <commonsio.version>2.6</commonsio.version>
+    </properties>
+
+
+</project>

libraries-6/src/test/java/com/baeldung/fj/FunctionalJavaUnitTest.java

@@ -4,6 +4,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
+import org.junit.Assert;
 import org.junit.Test;
 
 import fj.F;
@@ -96,9 +97,9 @@ public class FunctionalJavaUnitTest {
         Option<Integer> result2 = n2.bind(function);
         Option<Integer> result3 = n3.bind(function);
 
-        assertEquals(Option.none(), result1);
+        Assert.assertEquals(Option.none(), result1);
-        assertEquals(Option.some(102), result2);
+        Assert.assertEquals(Option.some(102), result2);
-        assertEquals(Option.none(), result3);
+        Assert.assertEquals(Option.none(), result3);
     }
 
     @Test