Merge remote-tracking branch 'upstream/master'

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

@@ -4,5 +4,5 @@ This module contains articles about Java 11 core features
 
 ### Relevant articles
 - [Guide to Java 8 Optional](https://www.baeldung.com/java-optional)
+- [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
 - [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
-

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Animal.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public abstract class Animal implements Eating {
 

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Bird.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public class Bird extends Animal {
     private boolean walks;

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/DynamicGreeter.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 import java.lang.annotation.Annotation;
 

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Eating.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public interface Eating {
     String eats();

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Goat.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public class Goat extends Animal implements Locomotion {
 

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Greeter.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/GreetingAnnotation.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Greetings.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 @Greeter(greet="Good morning")
 public class Greetings {

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Locomotion.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public interface Locomotion {
     String getLocomotion();

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Operations.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public class Operations {
 

core-java-modules/core-java-11-2/src/main/java/com/baeldung/reflection/Person.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 public class Person {
     private String name;

core-java-modules/core-java-11-2/src/test/java/com/baeldung/reflection/OperationsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.junit.Assert.assertFalse;

core-java-modules/core-java-11-2/src/test/java/com/baeldung/reflection/ReflectionUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.reflection;
+package com.baeldung.reflection;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -32,23 +32,23 @@ public class ReflectionUnitTest {
         final Class<?> clazz = goat.getClass();
 
         assertEquals("Goat", clazz.getSimpleName());
-        assertEquals("com.baeldung.java.reflection.Goat", clazz.getName());
-        assertEquals("com.baeldung.java.reflection.Goat", clazz.getCanonicalName());
+        assertEquals("com.baeldung.reflection.Goat", clazz.getName());
+        assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName());
     }
 
     @Test
     public void givenClassName_whenCreatesObject_thenCorrect() throws ClassNotFoundException {
-        final Class<?> clazz = Class.forName("com.baeldung.java.reflection.Goat");
+        final Class<?> clazz = Class.forName("com.baeldung.reflection.Goat");
 
         assertEquals("Goat", clazz.getSimpleName());
-        assertEquals("com.baeldung.java.reflection.Goat", clazz.getName());
-        assertEquals("com.baeldung.java.reflection.Goat", clazz.getCanonicalName());
+        assertEquals("com.baeldung.reflection.Goat", clazz.getName());
+        assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName());
     }
 
     @Test
     public void givenClass_whenRecognisesModifiers_thenCorrect() throws ClassNotFoundException {
-        final Class<?> goatClass = Class.forName("com.baeldung.java.reflection.Goat");
-        final Class<?> animalClass = Class.forName("com.baeldung.java.reflection.Animal");
+        final Class<?> goatClass = Class.forName("com.baeldung.reflection.Goat");
+        final Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
         final int goatMods = goatClass.getModifiers();
         final int animalMods = animalClass.getModifiers();
 
@@ -63,7 +63,7 @@ public class ReflectionUnitTest {
         final Class<?> goatClass = goat.getClass();
         final Package pkg = goatClass.getPackage();
 
-        assertEquals("com.baeldung.java.reflection", pkg.getName());
+        assertEquals("com.baeldung.reflection", pkg.getName());
     }
 
     @Test
@@ -81,8 +81,8 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsImplementedInterfaces_thenCorrect() throws ClassNotFoundException {
-        final Class<?> goatClass = Class.forName("com.baeldung.java.reflection.Goat");
-        final Class<?> animalClass = Class.forName("com.baeldung.java.reflection.Animal");
+        final Class<?> goatClass = Class.forName("com.baeldung.reflection.Goat");
+        final Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
         final Class<?>[] goatInterfaces = goatClass.getInterfaces();
         final Class<?>[] animalInterfaces = animalClass.getInterfaces();
 
@@ -94,16 +94,16 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsConstructor_thenCorrect() throws ClassNotFoundException {
-        final Class<?> goatClass = Class.forName("com.baeldung.java.reflection.Goat");
+        final Class<?> goatClass = Class.forName("com.baeldung.reflection.Goat");
         final Constructor<?>[] constructors = goatClass.getConstructors();
 
         assertEquals(1, constructors.length);
-        assertEquals("com.baeldung.java.reflection.Goat", constructors[0].getName());
+        assertEquals("com.baeldung.reflection.Goat", constructors[0].getName());
     }
 
     @Test
     public void givenClass_whenGetsFields_thenCorrect() throws ClassNotFoundException {
-        final Class<?> animalClass = Class.forName("com.baeldung.java.reflection.Animal");
+        final Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
         final Field[] fields = animalClass.getDeclaredFields();
 
         final List<String> actualFields = getFieldNames(fields);
@@ -114,7 +114,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsMethods_thenCorrect() throws ClassNotFoundException {
-        final Class<?> animalClass = Class.forName("com.baeldung.java.reflection.Animal");
+        final Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
         final Method[] methods = animalClass.getDeclaredMethods();
         final List<String> actualMethods = getMethodNames(methods);
 
@@ -124,7 +124,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsAllConstructors_thenCorrect() throws ClassNotFoundException {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Constructor<?>[] constructors = birdClass.getConstructors();
 
         assertEquals(3, constructors.length);
@@ -132,7 +132,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsEachConstructorByParamTypes_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         birdClass.getConstructor();
         birdClass.getConstructor(String.class);
         birdClass.getConstructor(String.class, boolean.class);
@@ -140,7 +140,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
 
         final Constructor<?> cons1 = birdClass.getConstructor();
         final Constructor<?> cons2 = birdClass.getConstructor(String.class);
@@ -159,7 +159,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsPublicFields_thenCorrect() throws ClassNotFoundException {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Field[] fields = birdClass.getFields();
         assertEquals(1, fields.length);
         assertEquals("CATEGORY", fields[0].getName());
@@ -168,7 +168,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsPublicFieldByName_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Field field = birdClass.getField("CATEGORY");
         assertEquals("CATEGORY", field.getName());
 
@@ -176,7 +176,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsDeclaredFields_thenCorrect() throws ClassNotFoundException {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Field[] fields = birdClass.getDeclaredFields();
         assertEquals(1, fields.length);
         assertEquals("walks", fields[0].getName());
@@ -184,7 +184,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsFieldsByName_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Field field = birdClass.getDeclaredField("walks");
         assertEquals("walks", field.getName());
 
@@ -192,14 +192,14 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClassField_whenGetsType_thenCorrect() throws Exception {
-        final Field field = Class.forName("com.baeldung.java.reflection.Bird").getDeclaredField("walks");
+        final Field field = Class.forName("com.baeldung.reflection.Bird").getDeclaredField("walks");
         final Class<?> fieldClass = field.getType();
         assertEquals("boolean", fieldClass.getSimpleName());
     }
 
     @Test
     public void givenClassField_whenSetsAndGetsValue_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Bird bird = (Bird) birdClass.getConstructor().newInstance();
         final Field field = birdClass.getDeclaredField("walks");
         field.setAccessible(true);
@@ -216,7 +216,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClassField_whenGetsAndSetsWithNull_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Field field = birdClass.getField("CATEGORY");
         field.setAccessible(true);
 
@@ -225,7 +225,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsAllPublicMethods_thenCorrect() throws ClassNotFoundException {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Method[] methods = birdClass.getMethods();
         final List<String> methodNames = getMethodNames(methods);
 
@@ -235,7 +235,7 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenClass_whenGetsOnlyDeclaredMethods_thenCorrect() throws ClassNotFoundException {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final List<String> actualMethodNames = getMethodNames(birdClass.getDeclaredMethods());
 
         final List<String> expectedMethodNames = Arrays.asList("setWalks", "walks", "getSound", "eats");
@@ -248,24 +248,17 @@ public class ReflectionUnitTest {
 
     @Test
     public void givenMethodName_whenGetsMethod_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
-        final Method walksMethod = birdClass.getDeclaredMethod("walks");
-        final Method setWalksMethod = birdClass.getDeclaredMethod("setWalks", boolean.class);
-
-        assertFalse(walksMethod.isAccessible());
-        assertFalse(setWalksMethod.isAccessible());
-
-        walksMethod.setAccessible(true);
-        setWalksMethod.setAccessible(true);
-
-        assertTrue(walksMethod.isAccessible());
-        assertTrue(setWalksMethod.isAccessible());
+        final Bird bird = new Bird();
+        final Method walksMethod = bird.getClass().getDeclaredMethod("walks");
+        final Method setWalksMethod = bird.getClass().getDeclaredMethod("setWalks", boolean.class);
 
+        assertTrue(walksMethod.canAccess(bird));
+        assertTrue(setWalksMethod.canAccess(bird));
     }
 
     @Test
     public void givenMethod_whenInvokes_thenCorrect() throws Exception {
-        final Class<?> birdClass = Class.forName("com.baeldung.java.reflection.Bird");
+        final Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
         final Bird bird = (Bird) birdClass.getConstructor().newInstance();
         final Method setWalksMethod = birdClass.getDeclaredMethod("setWalks", boolean.class);
         final Method walksMethod = birdClass.getDeclaredMethod("walks");

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/removeallperformance/HashSetBenchmark.java

@@ -0,0 +1,86 @@
+package com.baeldung.collections.removeallperformance;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.lang3.RandomStringUtils;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import com.baeldung.collections.containsperformance.Employee;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@Warmup(iterations = 5)
+public class HashSetBenchmark {
+
+    @State(Scope.Thread)
+    public static class MyState {
+        private Set<Employee> employeeSet1 = new HashSet<>();
+        private List<Employee> employeeList1 = new ArrayList<>();
+        private Set<Employee> employeeSet2 = new HashSet<>();
+        private List<Employee> employeeList2 = new ArrayList<>();
+
+        private long set1Size = 60000;
+        private long list1Size = 50000;
+        private long set2Size = 50000;
+        private long list2Size = 60000;
+
+        @Setup(Level.Trial)
+        public void setUp() {
+
+            for (long i = 0; i < set1Size; i++) {
+                employeeSet1.add(new Employee(i, RandomStringUtils.random(7, true, false)));
+            }
+
+            for (long i = 0; i < list1Size; i++) {
+                employeeList1.add(new Employee(i, RandomStringUtils.random(7, true, false)));
+            }
+
+            for (long i = 0; i < set2Size; i++) {
+                employeeSet2.add(new Employee(i, RandomStringUtils.random(7, true, false)));
+            }
+
+            for (long i = 0; i < list2Size; i++) {
+                employeeList2.add(new Employee(i, RandomStringUtils.random(7, true, false)));
+            }
+
+        }
+
+    }
+
+    @Benchmark
+    public boolean given_SizeOfHashsetGreaterThanSizeOfCollection_When_RemoveAllFromHashSet_Then_GoodPerformance(MyState state) {
+        return state.employeeSet1.removeAll(state.employeeList1);
+    }
+
+    @Benchmark
+    public boolean given_SizeOfHashsetSmallerThanSizeOfCollection_When_RemoveAllFromHashSet_Then_BadPerformance(MyState state) {
+        return state.employeeSet2.removeAll(state.employeeList2);
+    }
+
+    public static void main(String[] args) throws Exception {
+        Options options = new OptionsBuilder().include(HashSetBenchmark.class.getSimpleName())
+            .threads(1)
+            .forks(1)
+            .shouldFailOnError(true)
+            .shouldDoGC(true)
+            .jvmArgs("-server")
+            .build();
+        new Runner(options).run();
+    }
+
+}

core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/hashset/HashSetUnitTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.collections.hashset;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.junit.jupiter.api.Test;
+
+class HashSetUnitTest {
+
+    @Test
+    void whenRemoveAllFromHashset_thenRemovesAllElementsFromHashsetThatArePresentInCollection() {
+        Set<Integer> set = new HashSet<>();
+        Collection<Integer> collection = new ArrayList<>();
+        set.add(1);
+        set.add(2);
+        set.add(3);
+        set.add(4);
+        collection.add(1);
+        collection.add(3);
+
+        set.removeAll(collection);
+
+        assertEquals(2, set.size());
+        Integer[] actualElements = new Integer[set.size()];
+        Integer[] expectedElements = new Integer[] { 2, 4 };
+        assertArrayEquals(expectedElements, set.toArray(actualElements));
+    }
+
+}

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/checkclassexistence/CheckClassExistenceUnitTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.checkclassexistence;
+
+import org.junit.Test;
+
+public class CheckClassExistenceUnitTest {
+
+    public static class InitializingClass {
+        static {
+            if (true) { //enable throwing of an exception in a static initialization block
+                throw new RuntimeException();
+            }
+        }
+    }
+
+    @Test(expected = ClassNotFoundException.class) //thrown when class does not exist
+    public void givenNonExistingClass_whenUsingForName_thenClassNotFound() throws ClassNotFoundException {
+        Class.forName("class.that.does.not.exist");
+    }
+
+    @Test
+    public void givenExistingClass_whenUsingForName_thenNoException() throws ClassNotFoundException {
+        Class.forName("java.lang.String");
+    }
+
+    @Test(expected = ExceptionInInitializerError.class) //thrown when exception occurs inside of a static initialization block
+    public void givenInitializingClass_whenUsingForName_thenInitializationError() throws ClassNotFoundException {
+        Class.forName("com.baeldung.checkclassexistence.CheckClassExistenceUnitTest$InitializingClass");
+    }
+
+    @Test
+    public void givenInitializingClass_whenUsingForNameWithoutInitialization_thenNoException() throws ClassNotFoundException {
+        Class.forName("com.baeldung.checkclassexistence.CheckClassExistenceUnitTest$InitializingClass", false, getClass().getClassLoader());
+    }
+}

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

@@ -35,6 +35,12 @@
             <artifactId>async-http-client</artifactId>
             <version>${async-http-client.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.icegreen</groupId>
+            <artifactId>greenmail</artifactId>
+            <version>1.5.8</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/mail/mailwithattachment/MailWithAttachmentService.java

@@ -0,0 +1,83 @@
+package com.baeldung.mail.mailwithattachment;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Properties;
+import javax.mail.BodyPart;
+import javax.mail.Message;
+import javax.mail.MessagingException;
+import javax.mail.Multipart;
+import javax.mail.PasswordAuthentication;
+import javax.mail.Session;
+import javax.mail.Transport;
+import javax.mail.internet.AddressException;
+import javax.mail.internet.InternetAddress;
+import javax.mail.internet.MimeBodyPart;
+import javax.mail.internet.MimeMessage;
+import javax.mail.internet.MimeMultipart;
+
+public class MailWithAttachmentService {
+
+    private String username = "";
+    private String password = "";
+    private String host = "";
+    private String port = "";
+
+    MailWithAttachmentService() {
+    }
+
+    MailWithAttachmentService(String username, String password, String host, String port) {
+        this.username = username;
+        this.password = password;
+        this.host = host;
+        this.port = port;
+    }
+
+    public Session getSession() {
+        Properties props = new Properties();
+        props.put("mail.smtp.auth", "true");
+        props.put("mail.smtp.starttls.enable", "true");
+        props.put("mail.smtp.host", this.host);
+        props.put("mail.smtp.port", this.port);
+
+        Session session = Session.getInstance(props, new javax.mail.Authenticator() {
+            protected PasswordAuthentication getPasswordAuthentication() {
+                return new PasswordAuthentication(username, password);
+            }
+        });
+        return session;
+    }
+
+    public Message createMail(Session session) throws AddressException, MessagingException, IOException {
+        Message message = new MimeMessage(session);
+        message.setFrom(new InternetAddress("[email protected]"));
+        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("[email protected]"));
+        message.setSubject("Testing Subject");
+
+        BodyPart messageBodyPart = new MimeBodyPart();
+        messageBodyPart.setText("This is message body");
+
+        Multipart multipart = new MimeMultipart();
+        multipart.addBodyPart(messageBodyPart);
+
+        MimeBodyPart attachmentPart = new MimeBodyPart();
+        MimeBodyPart attachmentPart2 = new MimeBodyPart();
+
+        attachmentPart.attachFile(new File("C:\\Document1.txt"));
+        attachmentPart2.attachFile(new File("C:\\Document2.txt"));
+
+        multipart.addBodyPart(attachmentPart);
+        multipart.addBodyPart(attachmentPart2);
+
+        message.setContent(multipart);
+
+        return message;
+    }
+
+    public void sendMail(Session session) throws MessagingException, IOException {
+
+        Message message = createMail(session);
+        Transport.send(message);
+    }
+
+}

core-java-modules/core-java-networking-2/src/test/java/com/baeldung/mail/mailwithattachment/MailWithAttachmentServiceLiveTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.mail.mailwithattachment;
+
+import static org.junit.Assert.*;
+import javax.annotation.Resource;
+import javax.mail.Session;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.baeldung.mail.mailwithattachment.MailWithAttachmentService;
+import com.icegreen.greenmail.util.GreenMail;
+import com.icegreen.greenmail.util.ServerSetupTest;
+
+public class MailWithAttachmentServiceLiveTest {
+
+    @Resource
+    private MailWithAttachmentService emailService;
+    private GreenMail greenMail;
+
+    @Before
+    public void startMailServer() {
+        emailService = new MailWithAttachmentService();
+        greenMail = new GreenMail(ServerSetupTest.SMTP);
+        greenMail.start();
+    }
+
+    @After
+    public void stopMailServer() {
+        greenMail.stop();
+        emailService = null;
+    }
+
+    @Test
+    public void canSendMail() {
+        try {
+            Session testSession = greenMail.getSmtp()
+                .createSession();
+            emailService.sendMail(testSession);
+            assertEquals(1, greenMail.getReceivedMessages().length);
+            
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+}

core-java-modules/core-java-reflection/README.MD

@@ -3,7 +3,6 @@
 - [Void Type in Java](https://www.baeldung.com/java-void-type)
 - [Retrieve Fields from a Java Class Using Reflection](https://www.baeldung.com/java-reflection-class-fields)
 - [Method Parameter Reflection in Java](http://www.baeldung.com/java-parameter-reflection)
-- [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
 - [Call Methods at Runtime Using Java Reflection](http://www.baeldung.com/java-method-reflection)
 - [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
 - [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)

gradle-5/cmd-line-args/build.gradle

@@ -0,0 +1,38 @@
+apply plugin: "java"
+apply plugin: "application"
+description = "Gradle Command Line Arguments examples"
+
+ext.javaMainClass = "com.baeldung.cmd.MainClass"
+
+application {
+    mainClassName = javaMainClass
+}
+
+task propertyTypes(){
+    doLast{
+        if (project.hasProperty("args")) {
+            println "Our input argument with project property ["+project.getProperty("args")+"]"
+        }
+        println "Our input argument with system property ["+System.getProperty("args")+"]"
+    }
+}
+
+if (project.hasProperty("args")) {
+    ext.cmdargs = project.getProperty("args")
+} else { 
+    ext.cmdargs = "ls"
+}
+
+task cmdLineJavaExec(type: JavaExec) {
+    group = "Execution"
+    description = "Run the main class with JavaExecTask"
+    classpath = sourceSets.main.runtimeClasspath
+    main = javaMainClass
+    args cmdargs.split()
+}
+
+task cmdLineExec(type: Exec) {
+    group = "Execution"
+    description = "Run an external program with ExecTask"
+    commandLine cmdargs.split()
+}

gradle-5/cmd-line-args/src/main/java/com/baeldung/cmd/MainClass.java

@@ -0,0 +1,10 @@
+package com.baeldung.cmd;
+
+public class MainClass {
+    public static void main(String[] args) {
+        System.out.println("Gradle command line arguments example");
+        for (String arg : args) {
+            System.out.println("Got argument [" + arg + "]");
+        }
+    }
+}

gradle-5/settings.gradle

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

java-collections-conversions-2/pom.xml

@@ -15,6 +15,12 @@
     </parent>
 
     <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.17.2</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>

java-collections-conversions-2/src/test/java/com/baeldung/arrayconversion/ArrayToListConversionUnitTest.java

@@ -1,5 +1,6 @@
 package com.baeldung.arrayconversion;
 
+import org.assertj.core.api.ListAssert;
 import org.hamcrest.CoreMatchers;
 import org.junit.Test;
 
@@ -7,8 +8,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.junit.Assert.assertArrayEquals;
+import static org.assertj.core.api.Assertions.assertThat;
 
 public class ArrayToListConversionUnitTest {
 
@@ -17,8 +17,8 @@ public class ArrayToListConversionUnitTest {
         String[] stringArray = new String[] { "A", "B", "C", "D" };
         List<String> stringList = Arrays.asList(stringArray);
         stringList.set(0, "E");
-        assertThat(stringList, CoreMatchers.hasItems("E", "B", "C", "D"));
-        assertArrayEquals(stringArray, new String[] { "E", "B", "C", "D" });
+        assertThat(stringList).containsExactly("E", "B", "C", "D");
+        assertThat(stringArray).containsExactly("E", "B", "C", "D");
         stringList.add("F");
     }
 
@@ -27,9 +27,9 @@ public class ArrayToListConversionUnitTest {
         String[] stringArray = new String[] { "A", "B", "C", "D" };
         List<String> stringList = new ArrayList<>(Arrays.asList(stringArray));
         stringList.set(0, "E");
-        assertThat(stringList, CoreMatchers.hasItems("E", "B", "C", "D"));
-        assertArrayEquals(stringArray, new String[] { "A", "B", "C", "D" });
+        assertThat(stringList).containsExactly("E", "B", "C", "D");
+        assertThat(stringArray).containsExactly("A", "B", "C", "D");
         stringList.add("F");
-        assertThat(stringList, CoreMatchers.hasItems("E", "B", "C", "D", "F"));
+        assertThat(stringList).containsExactly("E", "B", "C", "D", "F");
     }
 }

logging-modules/flogger/pom.xml

@@ -9,6 +9,7 @@
         <groupId>com.baeldung</groupId>
         <artifactId>logging-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <dependencies>

logging-modules/log-mdc/pom.xml

@@ -79,6 +79,8 @@
     </dependencies>
 
     <build>
+        <finalName>logging-service</finalName>
+
         <pluginManagement>
             <plugins>
                 <plugin>
@@ -93,13 +95,21 @@
                 </plugin>
             </plugins>
         </pluginManagement>
-        <finalName>logging-service</finalName>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
     </build>
 
     <properties>
         <log4j2.version>2.7</log4j2.version>
         <disruptor.version>3.3.6</disruptor.version>
         <jbosslogging.version>3.3.0.Final</jbosslogging.version>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
     </properties>
 
 </project>

logging-modules/log4j/pom.xml

@@ -9,9 +9,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>logging-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
-        <relativePath>../../</relativePath>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <dependencies>

logging-modules/log4j2/pom.xml

@@ -7,9 +7,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
+        <artifactId>logging-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
-        <relativePath>../../</relativePath>
+        <relativePath>../pom.xml</relativePath>
     </parent>
 
     <dependencies>