Merge branch 'eugenp:master' into master

core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/abaproblem/AccountManualTest.java

@@ -12,7 +12,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-public class AccountUnitTest {
+public class AccountManualTest {
 
     private Account account;
 

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

@@ -14,6 +14,26 @@
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>${mockito-inline.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
     <build>
         <finalName>core-java-function</finalName>
         <resources>
@@ -24,4 +44,10 @@
         </resources>
     </build>
 
+    <properties>
+        <mockito-inline.version>3.8.0</mockito-inline.version>
+        <assertj.version>3.22.0</assertj.version>
+        <commons-lang3.version>3.12.0</commons-lang3.version>
+    </properties>
+
 </project>

core-java-modules/core-java-function/src/main/java/com/baeldung/staticmethods/CustomStringUtils.java

@@ -0,0 +1,9 @@
+package com.baeldung.staticmethods;
+
+public final class CustomStringUtils {
+
+    private CustomStringUtils() {}
+
+    public static boolean isEmpty(CharSequence cs) { return cs == null || cs.length() == 0; }
+
+}

core-java-modules/core-java-function/src/main/java/com/baeldung/staticmethods/StaticCounter.java

@@ -0,0 +1,15 @@
+package com.baeldung.staticmethods;
+
+public class StaticCounter {
+
+    private static int counter = 0;
+
+    public static int incrementCounter() {
+        return ++counter;
+    }
+
+    public static int getCounterValue() {
+        return counter;
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/CollectionUtilsUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.staticmethods;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CollectionUtilsUnitTest {
+
+    @Test
+    void givenListOfNumbers_whenReverseStaticMethodIsCalled_thenNumbersInReversedOrderAreReturned() {
+        List<String> list = Arrays.asList("1", "2", "3");
+        Collections.reverse(list);
+        assertThat(list).containsExactly("3", "2", "1");
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/CustomStringUtilsUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.staticmethods;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CustomStringUtilsUnitTest {
+
+    @Test
+    void givenNonEmptyString_whenIsEmptyMethodIsCalled_thenFalseIsReturned() {
+        boolean empty = CustomStringUtils.isEmpty("baeldung");
+        assertThat(empty).isFalse();
+    }
+
+    @Test
+    void givenEmptyString_whenIsEmptyMethodIsCalled_thenTrueIsReturned() {
+        boolean empty = CustomStringUtils.isEmpty("");
+        assertThat(empty).isTrue();
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/StaticCounterUnitTest.java

@@ -0,0 +1,16 @@
+package com.baeldung.staticmethods;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class StaticCounterUnitTest {
+
+    @Test
+    void givenStaticCounter_whenIncrementCounterIsCalled_thenValueIsIncresedByOne() {
+        int oldValue = StaticCounter.getCounterValue();
+        int newValue = StaticCounter.incrementCounter();
+        assertThat(newValue).isEqualTo(oldValue + 1);
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/StringUtilsUnitTest.java

@@ -0,0 +1,16 @@
+package com.baeldung.staticmethods;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class StringUtilsUnitTest {
+
+    @Test
+    void givenSimpleString_whenCapitalizeStaticMethodIsCalled_thenCapitalizedStringIsReturned() {
+        String str = StringUtils.capitalize("baeldung");
+        assertThat(str).isEqualTo("Baeldung");
+    }
+
+}

core-java-modules/core-java-streams-3/src/main/java/com/baeldung/streams/parallel/FileSearchCost.java

@@ -0,0 +1,60 @@
+package com.baeldung.streams.parallel;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import org.apache.commons.io.FileUtils;
+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.TearDown;
+
+@State(Scope.Benchmark)
+public class FileSearchCost {
+
+	private final static String FILE_NAME = "src/main/resources/Test";
+
+	@Setup(Level.Trial)
+	public void setup() throws IOException {
+		for (int i = 0; i < 1500; i++) {
+			File targetFile = new File(FILE_NAME + i);
+			FileUtils.writeStringToFile(targetFile, "Test", "UTF8");
+		}
+	}
+
+	@TearDown(Level.Trial)
+	public void tearDown() {
+		for (int i = 0; i < 1500; i++) {
+			File fileToDelete = new File(FILE_NAME + i);
+			fileToDelete.delete();
+		}
+	}
+
+	@Benchmark
+	@BenchmarkMode(Mode.AverageTime)
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public static void textFileSearchSequential() throws IOException {
+		Files.walk(Paths.get("src/main/resources/")).map(Path::normalize).filter(Files::isRegularFile)
+				.filter(path -> path.getFileName().toString().endsWith(".txt")).collect(Collectors.toList());
+	}
+
+	@Benchmark
+	@BenchmarkMode(Mode.AverageTime)
+	@OutputTimeUnit(TimeUnit.NANOSECONDS)
+	public static void textFileSearchParallel() throws IOException {
+		Files.walk(Paths.get("src/main/resources/")).parallel().map(Path::normalize).filter(Files::isRegularFile)
+				.filter(path -> path.getFileName().toString().endsWith(".txt")).collect(Collectors.toList());
+	}
+
+}
+

docker-modules/docker-environment-variables/Dockerfile

@@ -0,0 +1,10 @@
+FROM alpine:latest
+
+ARG name
+ENV env_name $name
+
+COPY greetings.sh .
+
+RUN chmod +x /greetings.sh
+
+CMD ["/greetings.sh"]

docker-modules/docker-environment-variables/greetings.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo Hello $env_name

kubernetes/k8s-admission-controller/README.md

@@ -1,4 +1,4 @@
 ## Relevant Articles:
 
-- [Creating a Kubertes Admission Controller in Java](https://www.baeldung.com/java-kubernetes-admission-controller)
+- [Creating a Kubernetes Admission Controller in Java](https://www.baeldung.com/java-kubernetes-admission-controller)
 - [Access Control Models](https://www.baeldung.com/java-access-control-models)

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/event/UuidIdentifiedEntityEventListener.java

@@ -0,0 +1,23 @@
+package com.baeldung.uuid.event;
+
+import java.util.UUID;
+
+import org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener;
+import org.springframework.data.mongodb.core.mapping.event.BeforeConvertEvent;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+
+
+public class UuidIdentifiedEntityEventListener extends AbstractMongoEventListener<UuidIdentifiedEntity> {
+    
+    @Override
+    public void onBeforeConvert(BeforeConvertEvent<UuidIdentifiedEntity> event) {
+        
+        super.onBeforeConvert(event);
+        UuidIdentifiedEntity entity = event.getSource();
+        
+        if(entity.getId() == null) {
+            entity.setId(UUID.randomUUID());
+        } 
+    }    
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/model/Book.java

@@ -0,0 +1,26 @@
+package com.baeldung.uuid.model;
+
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Document
+public class Book extends UuidIdentifiedEntity {    
+    
+    private String title;
+    private String author;
+            
+    public String getTitle() {
+        return title;
+    }
+    
+    public void setTitle(String title) {
+        this.title = title;
+    }
+    
+    public String getAuthor() {
+        return author;
+    }
+    
+    public void setAuthor(String author) {
+        this.author = author;
+    }   
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/model/UuidIdentifiedEntity.java

@@ -0,0 +1,25 @@
+package com.baeldung.uuid.model;
+
+import java.util.UUID;
+
+import org.springframework.data.annotation.Id;
+
+public abstract class UuidIdentifiedEntity {
+
+    @Id   
+    protected UUID id;    
+
+    public UUID getId() {
+        return id;
+    }
+    
+    public void setId(UUID id) {
+        
+        if(this.id != null) {
+            
+            throw new UnsupportedOperationException("ID is already defined");
+        }
+        
+        this.id = id;
+    }
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/repository/BookRepository.java

@@ -0,0 +1,11 @@
+package com.baeldung.uuid.repository;
+
+import java.util.UUID;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+
+import com.baeldung.uuid.model.Book;
+
+public interface BookRepository extends MongoRepository<Book, UUID> {
+
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/repository/CustomMongoRepository.java

@@ -0,0 +1,14 @@
+package com.baeldung.uuid.repository;
+
+import java.util.UUID;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.data.repository.NoRepositoryBean;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+
+
+@NoRepositoryBean
+public interface CustomMongoRepository<T extends UuidIdentifiedEntity> extends MongoRepository<T, UUID> {
+
+}

persistence-modules/spring-data-mongodb-2/src/main/java/com/baeldung/uuid/repository/impl/CustomMongoRepositoryImpl.java

@@ -0,0 +1,52 @@
+package com.baeldung.uuid.repository.impl;
+
+import java.util.List;
+import java.util.UUID;
+
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.data.mongodb.repository.query.MongoEntityInformation;
+import org.springframework.data.mongodb.repository.support.SimpleMongoRepository;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+import com.baeldung.uuid.repository.CustomMongoRepository;
+
+
+public class CustomMongoRepositoryImpl<T extends UuidIdentifiedEntity> extends SimpleMongoRepository<T, UUID> implements CustomMongoRepository<T> {
+
+    public CustomMongoRepositoryImpl(MongoEntityInformation<T, UUID> metadata, MongoOperations mongoOperations) {
+        
+        super(metadata, mongoOperations);        
+    }
+    
+    @Override
+    public <S extends T> S save(S entity) {
+        generateId(entity);
+        return super.save(entity);
+    }
+
+    @Override
+    public <S extends T> List<S> saveAll(Iterable<S> entities) {
+        entities.forEach(entity -> generateId(entity));
+        return super.saveAll(entities);
+    }
+
+    @Override
+    public <S extends T> S insert(S entity) {
+        generateId(entity);
+        return super.insert(entity);
+    }
+
+    @Override
+    public <S extends T> List<S> insert(Iterable<S> entities) {
+        entities.forEach(entity -> generateId(entity));
+        return super.insert(entities);
+    }
+
+    protected <S extends T> void generateId(S entity) {
+        
+        if(entity != null && entity.getId() == null) {
+            entity.setId(UUID.randomUUID());
+        }
+    }
+
+}

persistence-modules/spring-data-mongodb-2/src/test/java/com/baeldung/uuid/CustomRepositoryLiveTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.uuid;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.uuid.config.CustomRepositoryMongoConfig;
+import com.baeldung.uuid.model.Book;
+import com.baeldung.uuid.repository.BookRepository;
+
+/**
+ * 
+ * This test requires:
+ * * mongodb instance running on the environment
+ *
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = CustomRepositoryMongoConfig.class)
+public class CustomRepositoryLiveTest {
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private MongoOperations mongoOps;
+
+    @Before
+    public void testSetup() {
+        if (!mongoOps.collectionExists(Book.class)) {
+            mongoOps.createCollection(Book.class);
+        }
+    }
+
+    @After
+    public void tearDown() {
+        mongoOps.dropCollection(Book.class);
+    }
+
+    @Test
+    public void whenInsertingBook_thenBookIsInserted() {
+        final Book book = new Book();
+        book.setTitle("The Lord of the Rings");
+        book.setAuthor("JRR Tolkien");
+        Book savedBook = bookRepository.save(book);
+                
+        Book result = mongoOps.findOne(Query.query(Criteria.where("_id").is(savedBook.getId())), Book.class);
+                
+        assertEquals(result.getTitle(), "The Lord of the Rings");
+    }
+}

persistence-modules/spring-data-mongodb-2/src/test/java/com/baeldung/uuid/EntityCallbackLiveTest.java

@@ -0,0 +1,64 @@
+package com.baeldung.uuid;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.uuid.config.EntityCallbackMongoConfig;
+import com.baeldung.uuid.model.Book;
+import com.baeldung.uuid.repository.BookRepository;
+
+/**
+ * 
+ * This test requires:
+ * * mongodb instance running on the environment
+ *
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = EntityCallbackMongoConfig.class)
+public class EntityCallbackLiveTest {
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private MongoOperations mongoOps;
+
+    @Before
+    public void testSetup() {
+        if (!mongoOps.collectionExists(Book.class)) {
+            mongoOps.createCollection(Book.class);
+        }
+    }
+
+    @After
+    public void tearDown() {
+        mongoOps.dropCollection(Book.class);
+    }
+
+    @Test
+    public void whenSavingArticle_thenArticleIsInserted() {
+        final Book book = new Book();
+        book.setTitle("The Lord of the Rings");
+        book.setAuthor("JRR Tolkien");
+        
+        Book savedArticle = bookRepository.save(book);
+                
+        Book result = mongoOps.findOne(Query.query(Criteria.where("_id").is(savedArticle.getId())), Book.class);
+        
+        assertNotNull(result);
+        assertEquals(result.getTitle(), "The Lord of the Rings");
+    }
+
+
+}

persistence-modules/spring-data-mongodb-2/src/test/java/com/baeldung/uuid/EventLiveTest.java

@@ -0,0 +1,64 @@
+package com.baeldung.uuid;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoOperations;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.uuid.config.EventMongoConfig;
+import com.baeldung.uuid.model.Book;
+import com.baeldung.uuid.repository.BookRepository;
+
+/**
+ * 
+ * This test requires:
+ * * mongodb instance running on the environment
+ *
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = EventMongoConfig.class)
+public class EventLiveTest {
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private MongoOperations mongoOps;
+
+    @Before
+    public void testSetup() {
+        if (!mongoOps.collectionExists(Book.class)) {
+            mongoOps.createCollection(Book.class);
+        }
+    }
+
+    @After
+    public void tearDown() {
+        mongoOps.dropCollection(Book.class);
+    }
+
+    @Test
+    public void whenSavingArticle_thenArticleIsInserted() {
+        final Book book = new Book();
+        book.setTitle("The Lord of the Rings");
+        book.setAuthor("JRR Tolkien");
+        
+        Book savedArticle = bookRepository.save(book);
+                
+        Book result = mongoOps.findOne(Query.query(Criteria.where("_id").is(savedArticle.getId())), Book.class);
+        
+        assertNotNull(result);
+        assertEquals(result.getTitle(), "The Lord of the Rings");
+    }
+
+
+}

persistence-modules/spring-data-mongodb-2/src/test/java/com/baeldung/uuid/config/CustomRepositoryMongoConfig.java

@@ -0,0 +1,32 @@
+package com.baeldung.uuid.config;
+
+import org.bson.UuidRepresentation;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
+
+import com.baeldung.uuid.repository.impl.CustomMongoRepositoryImpl;
+import com.mongodb.ConnectionString;
+import com.mongodb.MongoClientSettings;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+
+@Configuration
+@EnableMongoRepositories(basePackages = "com.baeldung.uuid.repository", repositoryBaseClass = CustomMongoRepositoryImpl.class)
+public class CustomRepositoryMongoConfig {
+
+    @Bean
+    public MongoClient mongo() throws Exception {
+        final ConnectionString connectionString = new ConnectionString("mongodb://localhost:27017/test");
+        final MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
+                                                                    .uuidRepresentation(UuidRepresentation.STANDARD)
+                                                                    .applyConnectionString(connectionString).build();
+        return MongoClients.create(mongoClientSettings);
+    }
+
+    @Bean
+    public MongoTemplate mongoTemplate() throws Exception {
+        return new MongoTemplate(mongo(), "test");
+    }
+}

persistence-modules/spring-data-mongodb-2/src/test/java/com/baeldung/uuid/config/EntityCallbackMongoConfig.java

@@ -0,0 +1,48 @@
+package com.baeldung.uuid.config;
+
+import java.util.UUID;
+
+import org.bson.UuidRepresentation;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.mapping.event.BeforeConvertCallback;
+import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
+
+import com.baeldung.uuid.model.UuidIdentifiedEntity;
+import com.mongodb.ConnectionString;
+import com.mongodb.MongoClientSettings;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+
+@Configuration
+@EnableMongoRepositories(basePackages = "com.baeldung.uuid.repository")
+public class EntityCallbackMongoConfig {
+
+    @Bean
+    public MongoClient mongo() throws Exception {
+        final ConnectionString connectionString = new ConnectionString("mongodb://localhost:27017/test");
+        final MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
+                                                                    .uuidRepresentation(UuidRepresentation.STANDARD)
+                                                                    .applyConnectionString(connectionString).build();
+        return MongoClients.create(mongoClientSettings);
+    }
+
+    @Bean
+    public MongoTemplate mongoTemplate() throws Exception {
+        return new MongoTemplate(mongo(), "test");
+    }
+    
+    @Bean
+    public BeforeConvertCallback<UuidIdentifiedEntity> beforeSaveCallback() {
+        
+        return (entity, collection) -> {
+          
+            if(entity.getId() == null) {
+                entity.setId(UUID.randomUUID());
+            }
+            return entity;
+        };        
+    }
+    
+}

persistence-modules/spring-data-mongodb-2/src/test/java/com/baeldung/uuid/config/EventMongoConfig.java

@@ -0,0 +1,38 @@
+package com.baeldung.uuid.config;
+
+import org.bson.UuidRepresentation;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
+
+import com.baeldung.uuid.event.UuidIdentifiedEntityEventListener;
+import com.mongodb.ConnectionString;
+import com.mongodb.MongoClientSettings;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+
+@Configuration
+@EnableMongoRepositories(basePackages = "com.baeldung.uuid.repository")
+public class EventMongoConfig {
+
+    @Bean
+    public MongoClient mongo() throws Exception {
+        final ConnectionString connectionString = new ConnectionString("mongodb://localhost:27017/test");
+        final MongoClientSettings mongoClientSettings = MongoClientSettings.builder()
+                                                                    .uuidRepresentation(UuidRepresentation.STANDARD)
+                                                                    .applyConnectionString(connectionString).build();
+        return MongoClients.create(mongoClientSettings);
+    }
+
+    @Bean
+    public MongoTemplate mongoTemplate() throws Exception {
+        return new MongoTemplate(mongo(), "test");
+    }
+    
+    @Bean
+    public UuidIdentifiedEntityEventListener uuidIdentifiedEntityEventListener() {
+  
+        return new UuidIdentifiedEntityEventListener();
+    }
+}

spring-boot-modules/pom.xml

@@ -45,6 +45,7 @@
         <!-- <module>spring-boot-gradle</module> --> <!-- Not a maven project -->
         <module>spring-boot-jasypt</module>
         <module>spring-boot-keycloak</module>
+        <module>spring-boot-keycloak-2</module>
         <module>spring-boot-libraries</module>
         <module>spring-boot-libraries-2</module>
         <module>spring-boot-libraries-comparison</module>

spring-boot-modules/spring-boot-keycloak-2/README.md

@@ -0,0 +1,6 @@
+## Spring Boot Keycloak
+
+This module contains articles about Keycloak in Spring Boot projects.
+
+## Relevant articles:
+- [Disabling Keycloak Security in Spring Boot](https://www.baeldung.com/spring-keycloak-security-disable)

spring-boot-modules/spring-boot-keycloak-2/pom.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung.keycloak</groupId>
+    <artifactId>spring-boot-keycloak-2</artifactId>
+    <version>0.0.1</version>
+    <name>spring-boot-keycloak-2</name>
+    <packaging>jar</packaging>
+    <description>This is a simple application demonstrating integration between Keycloak and Spring Boot.</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-2</relativePath>
+    </parent>
+
+    <properties>
+        <keycloak-adapter-bom.version>15.0.2</keycloak-adapter-bom.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.keycloak</groupId>
+            <artifactId>keycloak-spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.keycloak.bom</groupId>
+                <artifactId>keycloak-adapter-bom</artifactId>
+                <version>${keycloak-adapter-bom.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

spring-boot-modules/spring-boot-keycloak-2/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-keycloak-2/src/test/java/com/baeldung/disablingkeycloak/DisablingKeycloakIntegrationTest.java

@@ -1,28 +1,25 @@
 package com.baeldung.disablingkeycloak;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import org.apache.http.HttpStatus;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
-import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.http.ResponseEntity;
 import org.springframework.test.context.ActiveProfiles;
-import org.springframework.test.context.junit4.SpringRunner;
 
 @SpringBootTest(classes = App.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-@RunWith(SpringRunner.class)
 @ActiveProfiles("disablingkeycloak")
-public class DisablingKeycloakIntegrationTest {
+class DisablingKeycloakIntegrationTest {
 
     @Autowired
     private TestRestTemplate restTemplate;
 
     @Test
-    public void givenUnauthenticated_whenGettingUser_shouldReturnUser() {
+    void givenUnauthenticated_whenGettingUser_shouldReturnUser() {
         ResponseEntity<User> responseEntity = restTemplate.getForEntity("/users/1", User.class);
 
         assertEquals(HttpStatus.SC_OK, responseEntity.getStatusCodeValue());

spring-boot-modules/spring-boot-keycloak/README.md

@@ -10,4 +10,3 @@ This module contains articles about Keycloak in Spring Boot projects.
 - [Customizing Themes for Keycloak](https://www.baeldung.com/spring-keycloak-custom-themes)
 - [Securing SOAP Web Services With Keycloak](https://www.baeldung.com/soap-keycloak)
 - [Get Keycloak User ID in Spring](https://www.baeldung.com/spring-keycloak-get-user-id)
-- [Disabling Keycloak Security in Spring Boot](https://www.baeldung.com/spring-keycloak-security-disable)