Merge pull request #4 from eugenp/master

merge

.gitignore

@@ -87,4 +87,7 @@ transaction.log
 apache-cxf/cxf-aegis/baeldung.xml
 testing-modules/report-*.json
 
-libraries-2/*.db
+libraries-2/*.db
+
+# SDKMan
+.sdkmanrc

apache-spark/pom.xml

@@ -74,6 +74,7 @@
         <plugins>
             <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.3.0</version>
                 <executions>
                     <execution>
                         <phase>package</phase>

core-java-modules/core-java-arrays-guides/src/main/java/com/baeldung/array/arraystoreexception/ArrayStoreExampleCE.java

@@ -0,0 +1,11 @@
+package com.baeldung.array.arraystoreexception;
+
+public class ArrayStoreExampleCE {
+
+    public static void main(String[] args) {
+        
+        //String array[] = new String[5]; //This will lead to compile-time error at line-8 when uncommented
+        //array[0] = 2;
+    }
+
+}

core-java-modules/core-java-arrays-guides/src/main/java/com/baeldung/array/arraystoreexception/ArrayStoreExceptionExample.java

@@ -0,0 +1,16 @@
+package com.baeldung.array.arraystoreexception;
+
+public class ArrayStoreExceptionExample {
+
+    public static void main(String[] args) {
+
+        try {
+            Object array[] = new String[5];
+            array[0] = 2;
+        } catch (ArrayStoreException e) {
+            // handle the exception
+        }
+
+    }
+
+}

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/illegalmonitorstate/Data.java

@@ -0,0 +1,14 @@
+package com.baeldung.exceptions.illegalmonitorstate;
+
+public class Data {
+    private String message;
+
+    public void send(String message) {
+        this.message = message;
+    }
+
+    public String receive() {
+        return message;
+    }
+}
+

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/illegalmonitorstate/SynchronizedReceiver.java

@@ -0,0 +1,39 @@
+package com.baeldung.exceptions.illegalmonitorstate;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class SynchronizedReceiver implements Runnable {
+    private static Logger log = LoggerFactory.getLogger(SynchronizedReceiver.class);
+    private final Data data;
+    private String message;
+    private boolean illegalMonitorStateExceptionOccurred;
+
+    public SynchronizedReceiver(Data data) {
+        this.data = data;
+    }
+
+    @Override
+    public void run() {
+        synchronized (data) {
+            try {
+                data.wait();
+                this.message = data.receive();
+            } catch (InterruptedException e) {
+                log.error("thread was interrupted", e);
+                Thread.currentThread().interrupt();
+            } catch (IllegalMonitorStateException e) {
+                log.error("illegal monitor state exception occurred", e);
+                illegalMonitorStateExceptionOccurred = true;
+            }
+        }
+    }
+
+    public boolean hasIllegalMonitorStateExceptionOccurred() {
+        return illegalMonitorStateExceptionOccurred;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+}

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/illegalmonitorstate/SynchronizedSender.java

@@ -0,0 +1,37 @@
+package com.baeldung.exceptions.illegalmonitorstate;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class SynchronizedSender implements Runnable {
+    private static Logger log = LoggerFactory.getLogger(SynchronizedSender.class);
+    private final Data data;
+    private boolean illegalMonitorStateExceptionOccurred;
+
+    public SynchronizedSender(Data data) {
+        this.data = data;
+    }
+
+    @Override
+    public void run() {
+        synchronized (data) {
+            try {
+                Thread.sleep(1000);
+
+                data.send("test");
+
+                data.notifyAll();
+            } catch (InterruptedException e) {
+                log.error("thread was interrupted", e);
+                Thread.currentThread().interrupt();
+            } catch (IllegalMonitorStateException e) {
+                log.error("illegal monitor state exception occurred", e);
+                illegalMonitorStateExceptionOccurred = true;
+            }
+        }
+    }
+
+    public boolean hasIllegalMonitorStateExceptionOccurred() {
+        return illegalMonitorStateExceptionOccurred;
+    }
+}

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/illegalmonitorstate/UnsynchronizedReceiver.java

@@ -0,0 +1,37 @@
+package com.baeldung.exceptions.illegalmonitorstate;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class UnsynchronizedReceiver implements Runnable {
+    private static Logger log = LoggerFactory.getLogger(UnsynchronizedReceiver.class);
+    private final Data data;
+    private String message;
+    private boolean illegalMonitorStateExceptionOccurred;
+
+    public UnsynchronizedReceiver(Data data) {
+        this.data = data;
+    }
+
+    @Override
+    public void run() {
+        try {
+            data.wait();
+            this.message = data.receive();
+        } catch (InterruptedException e) {
+            log.error("thread was interrupted", e);
+            Thread.currentThread().interrupt();
+        } catch (IllegalMonitorStateException e) {
+            log.error("illegal monitor state exception occurred", e);
+            illegalMonitorStateExceptionOccurred = true;
+        }
+    }
+
+    public boolean hasIllegalMonitorStateExceptionOccurred() {
+        return illegalMonitorStateExceptionOccurred;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+}

core-java-modules/core-java-exceptions-3/src/main/java/com/baeldung/exceptions/illegalmonitorstate/UnsynchronizedSender.java

@@ -0,0 +1,35 @@
+package com.baeldung.exceptions.illegalmonitorstate;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class UnsynchronizedSender implements Runnable {
+    private static Logger log = LoggerFactory.getLogger(UnsynchronizedSender.class);
+    private final Data data;
+    private boolean illegalMonitorStateExceptionOccurred;
+
+    public UnsynchronizedSender(Data data) {
+        this.data = data;
+    }
+
+    @Override
+    public void run() {
+        try {
+            Thread.sleep(1000);
+
+            data.send("test");
+
+            data.notifyAll();
+        } catch (InterruptedException e) {
+            log.error("thread was interrupted", e);
+            Thread.currentThread().interrupt();
+        } catch (IllegalMonitorStateException e) {
+            log.error("illegal monitor state exception occurred", e);
+            illegalMonitorStateExceptionOccurred = true;
+        }
+    }
+
+    public boolean hasIllegalMonitorStateExceptionOccurred() {
+        return illegalMonitorStateExceptionOccurred;
+    }
+}

core-java-modules/core-java-exceptions-3/src/test/java/com/baeldung/exceptions/illegalmonitorstate/IllegalMonitorStateExceptionUnitTest.java

@@ -0,0 +1,70 @@
+package com.baeldung.exceptions.illegalmonitorstate;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class IllegalMonitorStateExceptionUnitTest {
+
+    @Test
+    void whenSyncSenderAndSyncReceiverAreUsed_thenIllegalMonitorExceptionShouldNotBeThrown() throws InterruptedException {
+        Data data = new Data();
+
+        SynchronizedReceiver receiver = new SynchronizedReceiver(data);
+        Thread receiverThread = new Thread(receiver, "receiver-thread");
+        receiverThread.start();
+
+        SynchronizedSender sender = new SynchronizedSender(data);
+        Thread senderThread = new Thread(sender, "sender-thread");
+        senderThread.start();
+
+        senderThread.join(1000);
+        receiverThread.join(1000);
+
+        assertEquals("test", receiver.getMessage());
+        assertFalse(sender.hasIllegalMonitorStateExceptionOccurred());
+        assertFalse(receiver.hasIllegalMonitorStateExceptionOccurred());
+    }
+
+    @Test
+    void whenSyncSenderAndUnSyncReceiverAreUsed_thenIllegalMonitorExceptionShouldNotBeThrown() throws InterruptedException {
+        Data data = new Data();
+
+        UnsynchronizedReceiver receiver = new UnsynchronizedReceiver(data);
+        Thread receiverThread = new Thread(receiver, "receiver-thread");
+        receiverThread.start();
+
+        SynchronizedSender sender = new SynchronizedSender(data);
+        Thread senderThread = new Thread(sender, "sender-thread");
+        senderThread.start();
+
+
+        receiverThread.join(1000);
+        senderThread.join(1000);
+
+        assertNull(receiver.getMessage());
+        assertFalse(sender.hasIllegalMonitorStateExceptionOccurred());
+        assertTrue(receiver.hasIllegalMonitorStateExceptionOccurred());
+    }
+
+    @Test
+    void whenUnSyncSenderAndSyncReceiverAreUsed_thenIllegalMonitorExceptionShouldBeThrown() throws InterruptedException {
+        Data data = new Data();
+
+        SynchronizedReceiver receiver = new SynchronizedReceiver(data);
+        Thread receiverThread = new Thread(receiver, "receiver-thread");
+        receiverThread.start();
+
+        UnsynchronizedSender sender = new UnsynchronizedSender(data);
+        Thread senderThread = new Thread(sender, "sender-thread");
+        senderThread.start();
+
+
+        receiverThread.join(1000);
+        senderThread.join(1000);
+
+        assertNull(receiver.getMessage());
+        assertFalse(receiver.hasIllegalMonitorStateExceptionOccurred());
+        assertTrue(sender.hasIllegalMonitorStateExceptionOccurred());
+    }
+}

core-java-modules/core-java-io-2/src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <encoder>
+      <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+    </encoder>
+  </appender>
+
+  <root level="WARN">
+    <appender-ref ref="STDOUT" />
+  </root>
+</configuration>

core-kotlin-modules/core-kotlin-collections-2/README.md

@@ -0,0 +1,7 @@
+## Core Kotlin Collections
+
+This module contains articles about core Kotlin collections.
+
+### Relevant articles:
+
+

core-kotlin-modules/core-kotlin-collections-2/pom.xml

@@ -0,0 +1,47 @@
+<?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-kotlin-collections-2</artifactId>
+    <name>core-kotlin-collections-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-kotlin-modules</groupId>
+        <artifactId>core-kotlin-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib-jdk8</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-math3</artifactId>
+            <version>${commons-math3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <kotlin.version>1.3.30</kotlin.version>
+        <commons-math3.version>3.6.1</commons-math3.version>
+        <assertj.version>3.10.0</assertj.version>
+    </properties>
+
+</project>

core-kotlin-modules/core-kotlin-collections-2/src/main/kotlin/com/baeldung/aggregate/AggregateOperations.kt

@@ -0,0 +1,107 @@
+package com.baeldung.aggregate
+
+class AggregateOperations {
+    private val numbers = listOf(1, 15, 3, 8)
+
+    fun countList(): Int {
+        return numbers.count()
+    }
+
+    fun sumList(): Int {
+        return numbers.sum()
+    }
+
+    fun averageList(): Double {
+        return numbers.average()
+    }
+
+    fun maximumInList(): Int? {
+        return numbers.max()
+    }
+
+    fun minimumInList(): Int? {
+        return numbers.min()
+    }
+
+    fun maximumByList(): Int? {
+        return numbers.maxBy { it % 5 }
+    }
+
+    fun minimumByList(): Int? {
+        return numbers.minBy { it % 5 }
+    }
+
+    fun maximumWithList(): String? {
+        val strings = listOf("Berlin", "Kolkata", "Prague", "Barcelona")
+        return strings.maxWith(compareBy { it.length % 4 })
+    }
+
+    fun minimumWithList(): String? {
+        val strings = listOf("Berlin", "Kolkata", "Prague", "Barcelona")
+        return strings.minWith(compareBy { it.length % 4 })
+    }
+
+    fun sumByList(): Int {
+        return numbers.sumBy { it * 5 }
+    }
+
+    fun sumByDoubleList(): Double {
+        return numbers.sumByDouble { it.toDouble() / 8 }
+    }
+
+    fun foldList(): Int {
+        return numbers.fold(100) { total, it ->
+            println("total = $total, it = $it")
+            total - it
+        } // ((((100 - 1)-15)-3)-8) = 73
+    }
+
+    fun foldRightList(): Int {
+        return numbers.foldRight(100) { it, total ->
+            println("total = $total, it = $it")
+            total - it
+        }  // ((((100-8)-3)-15)-1) = 73
+    }
+
+    fun foldIndexedList(): Int {
+        return numbers.foldIndexed(100) { index, total, it ->
+            println("total = $total, it = $it, index = $index")
+            if (index.minus(2) >= 0) total - it else total
+        } // ((100 - 3)-8) = 89
+    }
+
+    fun foldRightIndexedList(): Int {
+        return numbers.foldRightIndexed(100) { index, it, total ->
+            println("total = $total, it = $it, index = $index")
+            if (index.minus(2) >= 0) total - it else total
+        } // ((100 - 8)-3) = 89
+    }
+
+    fun reduceList(): Int {
+        return numbers.reduce { total, it ->
+            println("total = $total, it = $it")
+            total - it
+        } // (((1 - 15)-3)-8) = -25
+    }
+
+    fun reduceRightList(): Int {
+        return numbers.reduceRight() { it, total ->
+            println("total = $total, it = $it")
+            total - it
+        } // ((8-3)-15)-1) = -11
+    }
+
+    fun reduceIndexedList(): Int {
+        return numbers.reduceIndexed { index, total, it ->
+            println("total = $total, it = $it, index = $index")
+            if (index.minus(2) >= 0) total - it else total
+        } // ((1-3)-8) = -10
+    }
+
+    fun reduceRightIndexedList(): Int {
+        return numbers.reduceRightIndexed { index, it, total ->
+            println("total = $total, it = $it, index = $index")
+            if (index.minus(2) >= 0) total - it else total
+        } // ((8-3) = 5
+    }
+}

core-kotlin-modules/core-kotlin-collections-2/src/test/kotlin/com/baeldung/aggregate/AggregateOperationsUnitTest.kt

@@ -0,0 +1,104 @@
+package com.baeldung.aggregate
+
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class AggregateOperationsUnitTest {
+
+    private val classUnderTest: AggregateOperations = AggregateOperations()
+
+    @Test
+    fun whenCountOfList_thenReturnsValue() {
+        assertEquals(4, classUnderTest.countList())
+    }
+
+    @Test
+    fun whenSumOfList_thenReturnsTotalValue() {
+        assertEquals(27, classUnderTest.sumList())
+    }
+
+    @Test
+    fun whenAverageOfList_thenReturnsValue() {
+        assertEquals(6.75, classUnderTest.averageList())
+    }
+
+    @Test
+    fun whenMaximumOfList_thenReturnsMaximumValue() {
+        assertEquals(15, classUnderTest.maximumInList())
+    }
+
+    @Test
+    fun whenMinimumOfList_thenReturnsMinimumValue() {
+        assertEquals(1, classUnderTest.minimumInList())
+    }
+
+    @Test
+    fun whenMaxByList_thenReturnsLargestValue() {
+        assertEquals(3, classUnderTest.maximumByList())
+    }
+
+    @Test
+    fun whenMinByList_thenReturnsSmallestValue() {
+        assertEquals(15, classUnderTest.minimumByList())
+    }
+
+    @Test
+    fun whenMaxWithList_thenReturnsLargestValue(){
+        assertEquals("Kolkata", classUnderTest.maximumWithList())
+    }
+
+    @Test
+    fun whenMinWithList_thenReturnsSmallestValue(){
+        assertEquals("Barcelona", classUnderTest.minimumWithList())
+    }
+
+    @Test
+    fun whenSumByList_thenReturnsIntegerValue(){
+        assertEquals(135, classUnderTest.sumByList())
+    }
+
+    @Test
+    fun whenSumByDoubleList_thenReturnsDoubleValue(){
+        assertEquals(3.375, classUnderTest.sumByDoubleList())
+    }
+
+    @Test
+    fun whenFoldList_thenReturnsValue(){
+        assertEquals(73, classUnderTest.foldList())
+    }
+
+    @Test
+    fun whenFoldRightList_thenReturnsValue(){
+        assertEquals(73, classUnderTest.foldRightList())
+    }
+
+    @Test
+    fun whenFoldIndexedList_thenReturnsValue(){
+        assertEquals(89, classUnderTest.foldIndexedList())
+    }
+
+    @Test
+    fun whenFoldRightIndexedList_thenReturnsValue(){
+        assertEquals(89, classUnderTest.foldRightIndexedList())
+    }
+
+    @Test
+    fun whenReduceList_thenReturnsValue(){
+        assertEquals(-25, classUnderTest.reduceList())
+    }
+
+    @Test
+    fun whenReduceRightList_thenReturnsValue(){
+        assertEquals(-11, classUnderTest.reduceRightList())
+    }
+
+    @Test
+    fun whenReduceIndexedList_thenReturnsValue(){
+        assertEquals(-10, classUnderTest.reduceIndexedList())
+    }
+
+    @Test
+    fun whenReduceRightIndexedList_thenReturnsValue(){
+        assertEquals(5, classUnderTest.reduceRightIndexedList())
+    }
+}

core-kotlin-modules/pom.xml

@@ -21,6 +21,7 @@
         <module>core-kotlin-advanced</module>
         <module>core-kotlin-annotations</module>
         <module>core-kotlin-collections</module>
+        <module>core-kotlin-collections-2</module>
         <module>core-kotlin-concurrency</module>
         <module>core-kotlin-date-time</module>
         <module>core-kotlin-design-patterns</module>

drools/README.MD

@@ -6,3 +6,4 @@ This module contains articles about Drools
 
 - [Introduction to Drools](https://www.baeldung.com/drools)
 - [An Example of Backward Chaining in Drools](https://www.baeldung.com/drools-backward-chaining)
+- [Drools Using Rules from Excel Files](https://www.baeldung.com/drools-excel)

gradle-5/settings.gradle

@@ -1,3 +1,4 @@
 rootProject.name='gradle-5-articles'
 include 'java-exec'
-include 'unused-dependencies'
+include 'unused-dependencies'
+include 'source-sets'

gradle-5/source-sets/.gitignore

@@ -0,0 +1 @@
+/build/

gradle-5/source-sets/build.gradle

@@ -0,0 +1,67 @@
+
+apply plugin: "eclipse"
+apply plugin: "java"
+
+description = "Source Sets example"
+
+task printSourceSetInformation(){
+    description = "Print source set information"
+
+    doLast{
+        sourceSets.each { srcSet ->
+            println "["+srcSet.name+"]"
+            print "-->Source directories: "+srcSet.allJava.srcDirs+"\n"
+            print "-->Output directories: "+srcSet.output.classesDirs.files+"\n"
+            print "-->Compile classpath:\n"
+            srcSet.compileClasspath.files.each { 
+                print "  "+it.path+"\n"
+            }
+            println ""
+        }
+    }
+}
+
+sourceSets{
+    itest {
+        compileClasspath += sourceSets.main.output
+        runtimeClasspath += sourceSets.main.output
+        java {
+        }
+    }
+}
+
+test {
+    testLogging {
+        events "passed","skipped", "failed"
+    }
+}
+
+dependencies {
+    implementation('org.apache.httpcomponents:httpclient:4.5.12')
+    testImplementation('junit:junit:4.12')
+    itestImplementation('com.google.guava:guava:29.0-jre')
+}
+
+task itest(type: Test) {
+    description = "Run integration tests"
+    group = "verification"
+    testClassesDirs = sourceSets.itest.output.classesDirs
+    classpath = sourceSets.itest.runtimeClasspath
+}
+
+itest {
+    testLogging {
+        events "passed","skipped", "failed"
+    }
+}
+
+configurations {
+    itestImplementation.extendsFrom(testImplementation)
+    itestRuntimeOnly.extendsFrom(testRuntimeOnly)
+}
+
+eclipse {
+    classpath {
+        plusConfigurations+=[configurations.itestCompileClasspath] 
+    } 
+}

gradle-5/source-sets/src/itest/java/com/baeldung/itest/SourceSetsItest.java

@@ -0,0 +1,25 @@
+package com.baeldung.itest;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.List;
+
+import org.junit.Test;
+
+import com.baeldung.main.SourceSetsObject;
+import com.google.common.collect.ImmutableList;
+
+public class SourceSetsItest {
+
+    @Test
+    public void givenImmutableList_whenRun_ThenSuccess() {
+
+        SourceSetsObject underTest = new SourceSetsObject("lorem", "ipsum");
+        List<String> someStrings = ImmutableList.of("Baeldung", "is", "cool");
+
+        assertThat(underTest.getUser(), is("lorem"));
+        assertThat(underTest.getPassword(), is("ipsum"));
+        assertThat(someStrings.size(), is(3));
+    }
+}

gradle-5/source-sets/src/main/java/com/baeldung/main/SourceSetsMain.java

@@ -0,0 +1,9 @@
+package com.baeldung.main;
+
+public class SourceSetsMain {
+
+    public static void main(String[] args) {
+        System.out.println("Hell..oh...world!");
+    }
+
+}

gradle-5/source-sets/src/main/java/com/baeldung/main/SourceSetsObject.java

@@ -0,0 +1,21 @@
+package com.baeldung.main;
+
+public class SourceSetsObject {
+
+    private final String user;
+    private final String password;
+
+    public SourceSetsObject(String user, String password) {
+        this.user = user;
+        this.password = password;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String getUser() {
+        return user;
+    }
+
+}

gradle-5/source-sets/src/test/java/com/baeldung/test/SourceSetsTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+
+import com.baeldung.main.SourceSetsObject;
+
+public class SourceSetsTest {
+
+    @Test
+    public void whenRun_ThenSuccess() {
+
+        SourceSetsObject underTest = new SourceSetsObject("lorem", "ipsum");
+
+        assertThat(underTest.getUser(), is("lorem"));
+        assertThat(underTest.getPassword(), is("ipsum"));
+    }
+}

jhipster-5/bookstore-monolith/pom.xml

@@ -237,6 +237,26 @@
     <build>
         <defaultGoal>spring-boot:run</defaultGoal>
         <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>properties-maven-plugin</artifactId>
+                <version>1.0.0</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>set-system-properties</goal>
+                        </goals>
+                        <configuration>
+                            <properties>
+                                <property>
+                                    <name>org.slf4j.simpleLogger.log.com.github.eirslett</name>
+                                    <value>error</value>
+                                </property>
+                            </properties>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>

jhipster/pom.xml

@@ -9,6 +9,8 @@
     <packaging>pom</packaging>
 
     <parent>
+    <!-- Jhipster project is autogenerated and upgrading it will need a newly generated project. 
+        Also, we already have jhipster-5 which has new version of boot-2. So, this project should be left as a legacy version. -->
         <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>
         <version>0.0.1-SNAPSHOT</version>

libraries-security/pom.xml

@@ -14,29 +14,24 @@
     </parent>
 
     <dependencies>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.security.oauth</groupId>
             <artifactId>spring-security-oauth2</artifactId>
             <version>${spring-boot.version}</version>
         </dependency>
-        
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-web</artifactId>
         </dependency>
-
         <dependency>
             <groupId>com.github.scribejava</groupId>
             <artifactId>scribejava-apis</artifactId>
             <version>${scribejava.version}</version>
         </dependency>
-
         <dependency>
             <groupId>com.google.crypto.tink</groupId>
             <artifactId>tink</artifactId>
@@ -72,6 +67,16 @@
             <artifactId>jasypt</artifactId>
             <version>${jasypt.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.jcraft</groupId>
+            <artifactId>jsch</artifactId>
+            <version>${jsch.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.sshd</groupId>
+            <artifactId>sshd-core</artifactId>
+            <version>${apache-mina.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -81,6 +86,8 @@
         <cryptacular.version>1.2.2</cryptacular.version>
         <jasypt.version>1.9.2</jasypt.version>
         <bouncycastle.version>1.58</bouncycastle.version>
+        <jsch.version>0.1.55</jsch.version>
+        <apache-mina.version>2.5.1</apache-mina.version>
     </properties>
 
 </project>

libraries-security/src/main/java/com/baeldung/ssh/apachesshd/SshdDemo.java

@@ -0,0 +1,64 @@
+package com.baeldung.ssh.apachesshd;
+
+import java.io.ByteArrayOutputStream;
+import java.io.OutputStream;
+import java.util.EnumSet;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.sshd.client.SshClient;
+import org.apache.sshd.client.channel.ClientChannel;
+import org.apache.sshd.client.channel.ClientChannelEvent;
+import org.apache.sshd.client.session.ClientSession;
+import org.apache.sshd.common.channel.Channel;
+
+public class SshdDemo {
+
+    public static void main(String[] args) throws Exception {
+        String username = "demo";
+        String password = "password";
+        String host = "test.rebex.net";
+        int port = 22;
+        long defaultTimeoutSeconds = 10l;
+        String command = "ls\n";
+        
+        listFolderStructure(username, password, host, port, defaultTimeoutSeconds, command);
+    }
+
+    public static String listFolderStructure(String username, String password, String host, int port, long defaultTimeoutSeconds, String command) throws Exception {
+        SshClient client = SshClient.setUpDefaultClient();
+        client.start();
+        try (ClientSession session = client.connect(username, host, port)
+          .verify(defaultTimeoutSeconds, TimeUnit.SECONDS)
+            .getSession()) {
+            session.addPasswordIdentity(password);
+            session.auth()
+              .verify(5L, TimeUnit.SECONDS);
+            try (ByteArrayOutputStream responseStream = new ByteArrayOutputStream();
+                 ByteArrayOutputStream errorResponseStream = new ByteArrayOutputStream();
+                 ClientChannel channel = session.createChannel(Channel.CHANNEL_SHELL)) {
+                channel.setOut(responseStream);
+                channel.setErr(errorResponseStream);
+                try {
+                    channel.open()
+                      .verify(defaultTimeoutSeconds, TimeUnit.SECONDS);
+                    try (OutputStream pipedIn = channel.getInvertedIn()) {
+                        pipedIn.write(command.getBytes());
+                        pipedIn.flush();
+                    }
+                    channel.waitFor(EnumSet.of(ClientChannelEvent.CLOSED), TimeUnit.SECONDS.toMillis(defaultTimeoutSeconds));
+                    String errorString = new String(errorResponseStream.toByteArray());
+                    if(!errorString.isEmpty()) {
+                        throw new Exception(errorString);
+                    }
+                    String responseString = new String(responseStream.toByteArray());
+                    return responseString;
+                } finally {
+                    channel.close(false);
+                }
+            }
+        } finally {
+            client.stop();
+        }
+    }
+
+}

libraries-security/src/main/java/com/baeldung/ssh/jsch/JschDemo.java

@@ -0,0 +1,52 @@
+package com.baeldung.ssh.jsch;
+
+import java.io.ByteArrayOutputStream;
+
+import com.jcraft.jsch.ChannelExec;
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.Session;
+
+public class JschDemo {
+
+    public static void main(String args[]) throws Exception {
+        String username = "demo";
+        String password = "password";
+        String host = "test.rebex.net";
+        int port = 22;
+        String command = "ls";
+        listFolderStructure(username, password, host, port, command);
+    }
+
+    public static String listFolderStructure(String username, String password, String host, int port, String command) throws Exception {
+        Session session = null;
+        ChannelExec channel = null;
+        String response = null;
+        try {
+            session = new JSch().getSession(username, host, port);
+            session.setPassword(password);
+            session.setConfig("StrictHostKeyChecking", "no");
+            session.connect();
+            channel = (ChannelExec) session.openChannel("exec");
+            channel.setCommand(command);
+            ByteArrayOutputStream responseStream = new ByteArrayOutputStream();
+            ByteArrayOutputStream errorResponseStream = new ByteArrayOutputStream();
+            channel.setOutputStream(responseStream);
+            channel.setErrStream(errorResponseStream);
+            channel.connect();
+            while (channel.isConnected()) {
+                Thread.sleep(100);
+            }
+            String errorResponse = new String(errorResponseStream.toByteArray());
+            response = new String(responseStream.toByteArray());
+            if(!errorResponse.isEmpty()) {
+                throw new Exception(errorResponse);
+            }
+        } finally {
+            if (session != null)
+                session.disconnect();
+            if (channel != null)
+                channel.disconnect();
+        }
+        return response;
+    }
+}

libraries-security/src/test/java/com/baeldung/ssh/ApacheMinaSshdLiveTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.ssh;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+import com.baeldung.ssh.apachesshd.SshdDemo;
+
+public class ApacheMinaSshdLiveTest {
+
+    @Test
+    public void givenValidCredentials_whenConnectionIsEstablished_thenServerReturnsResponse() throws Exception {
+        String username = "demo";
+        String password = "password";
+        String host = "test.rebex.net";
+        int port = 22;
+        long defaultTimeoutSeconds = 10l;
+        String command = "ls\n";
+        String responseString = SshdDemo.listFolderStructure(username, password, host, port, defaultTimeoutSeconds, command);
+        
+        assertNotNull(responseString);
+    }
+
+    @Test(expected = Exception.class)
+    public void givenInvalidCredentials_whenConnectionAttemptIsMade_thenServerReturnsErrorResponse() throws Exception {
+        String username = "invalidUsername";
+        String password = "password";
+        String host = "test.rebex.net";
+        int port = 22;
+        long defaultTimeoutSeconds = 10l;
+        String command = "ls\n";
+        String responseString = SshdDemo.listFolderStructure(username, password, host, port, defaultTimeoutSeconds, command);
+        
+        assertNull(responseString);
+    }
+
+}