Merge branch 'master' into BAEL-2527

algorithms-miscellaneous-1/README.md

@@ -15,3 +15,5 @@
 - [Find Substrings That Are Palindromes in Java](https://www.baeldung.com/java-palindrome-substrings)
 - [Find the Longest Substring without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
 - [Java Two Pointer Technique](https://www.baeldung.com/java-two-pointer-technique)
+- [Permutations of an Array in Java](https://www.baeldung.com/java-array-permutations)
+- [Implementing Simple State Machines with Java Enums](https://www.baeldung.com/java-enum-simple-state-machine)

apache-spark/README.md

@@ -1,3 +1,4 @@
 ### Relevant articles
 
 - [Introduction to Apache Spark](http://www.baeldung.com/apache-spark)
+- [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)

core-java-11/README.md

@@ -3,3 +3,4 @@
 - [Java 11 Single File Source Code](https://www.baeldung.com/java-single-file-source-code)
 - [Java 11 Local Variable Syntax for Lambda Parameters](https://www.baeldung.com/java-var-lambda-params)
 - [Java 11 String API Additions](https://www.baeldung.com/java-11-string-api)
+- [Java 11 Nest Based Access Control](https://www.baeldung.com/java-nest-based-access-control)

core-java-9/README.md

@@ -26,3 +26,4 @@
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
 - [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
 - [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
+- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)

core-java-arrays/README.md

@@ -14,3 +14,4 @@
 - [Array Operations in Java](http://www.baeldung.com/java-common-array-operations)
 - [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
 - [Sorting Arrays in Java](https://www.baeldung.com/java-sorting-arrays)
+- [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array)

core-java-collections/README.md

@@ -31,3 +31,4 @@
 - [A Guide to EnumMap](https://www.baeldung.com/java-enum-map)
 - [A Guide to Iterator in Java](http://www.baeldung.com/java-iterator)
 - [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
+- [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)

core-java-io/README.md

@@ -38,3 +38,5 @@
 - [How to Get the File Extension of a File in Java](http://www.baeldung.com/java-file-extension)
 - [Getting a File’s Mime Type in Java](http://www.baeldung.com/java-file-mime-type)
 - [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
+- [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
+- [List Files in a Directory in Java](https://www.baeldung.com/java-list-directory-files)

core-java-lang-syntax/README.md

@@ -16,4 +16,5 @@
 - [Quick Guide to java.lang.System](http://www.baeldung.com/java-lang-system)
 - [Java Switch Statement](https://www.baeldung.com/java-switch)
 - [The Modulo Operator in Java](https://www.baeldung.com/modulo-java)
-- [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)
+- [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)
+- [Java instanceof Operator](https://www.baeldung.com/java-instanceof)

core-java-lang/README.md

@@ -34,4 +34,10 @@
 - [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
 - [Retrieving a Class Name in Java](https://www.baeldung.com/java-class-name)
 - [Java Compound Operators](https://www.baeldung.com/java-compound-operators)
-- [Guide to Java Packages](https://www.baeldung.com/java-packages)
+- [Guide to Java Packages](https://www.baeldung.com/java-packages)
+- [The Java Native Keyword and Methods](https://www.baeldung.com/java-native)
+- [If-Else Statement in Java](https://www.baeldung.com/java-if-else)
+- [Control Structures in Java](https://www.baeldung.com/java-control-structures)
+- [Java Interfaces](https://www.baeldung.com/java-interfaces)
+- [Attaching Values to Java Enum](https://www.baeldung.com/java-enum-values)
+- [Variable Scope in Java](https://www.baeldung.com/java-variable-scope)

core-java-perf/README.md

@@ -5,4 +5,5 @@
 - [Different Ways to Capture Java Heap Dumps](https://www.baeldung.com/java-heap-dump-capture)
 - [Understanding Memory Leaks in Java](https://www.baeldung.com/java-memory-leaks)
 - [OutOfMemoryError: GC Overhead Limit Exceeded](http://www.baeldung.com/java-gc-overhead-limit-exceeded)
-- [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)
+- [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)
+- [Monitoring Java Applications with Flight Recorder](https://www.baeldung.com/java-flight-recorder-monitoring)

core-java-security/README.md

@@ -8,4 +8,5 @@
 - [Encrypting and Decrypting Files in Java](http://www.baeldung.com/java-cipher-input-output-stream)
 - [Hashing a Password in Java](https://www.baeldung.com/java-password-hashing)
 - [SSL Handshake Failures](https://www.baeldung.com/java-ssl-handshake-failures)
-- [SHA-256 Hashing in Java](https://www.baeldung.com/sha-256-hashing-java)
+- [SHA-256 Hashing in Java](https://www.baeldung.com/sha-256-hashing-java)
+- [Enabling TLS v1.2 in Java 7](https://www.baeldung.com/java-7-tls-v12)

core-java/README.md

@@ -47,3 +47,7 @@
 - [Console I/O in Java](http://www.baeldung.com/java-console-input-output)
 - [Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
 - [Retrieve Fields from a Java Class Using Reflection](https://www.baeldung.com/java-reflection-class-fields)
+- [Introduction to Basic Syntax in Java](https://www.baeldung.com/java-syntax)
+- [Using Curl in Java](https://www.baeldung.com/java-curl)
+- [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
+- [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)

core-kotlin/README.md

@@ -51,3 +51,4 @@
 - [Operator Overloading in Kotlin](https://www.baeldung.com/kotlin-operator-overloading)
 - [Inline Classes in Kotlin](https://www.baeldung.com/kotlin-inline-classes)
 - [Creating Java static final Equivalents in Kotlin](https://www.baeldung.com/kotlin-java-static-final)
+- [Nested forEach in Kotlin](https://www.baeldung.com/kotlin-nested-foreach)

guice/pom.xml

@@ -26,4 +26,4 @@
         <guice.version>4.1.0</guice.version>
     </properties>
 
-</project>
+</project>

guice/src/main/java/com/baeldung/examples/common/Account.java

@@ -0,0 +1,24 @@
+package com.baeldung.examples.common;
+
+public class Account {
+
+	private String accountNumber;
+	private String type;
+
+	public String getAccountNumber() {
+		return accountNumber;
+	}
+
+	public void setAccountNumber(String accountNumber) {
+		this.accountNumber = accountNumber;
+	}
+
+	public String getType() {
+		return type;
+	}
+
+	public void setType(String type) {
+		this.type = type;
+	}
+
+}

guice/src/main/java/com/baeldung/examples/common/AccountService.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface AccountService {
+
+}

guice/src/main/java/com/baeldung/examples/common/AccountServiceImpl.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public class AccountServiceImpl implements AccountService {
+
+}

guice/src/main/java/com/baeldung/examples/common/AudioBookService.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface AudioBookService {
+
+}

guice/src/main/java/com/baeldung/examples/common/AudioBookServiceImpl.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public class AudioBookServiceImpl implements AudioBookService {
+
+}

guice/src/main/java/com/baeldung/examples/common/AuthorService.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface AuthorService {
+
+}

guice/src/main/java/com/baeldung/examples/common/AuthorServiceImpl.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public class AuthorServiceImpl implements AuthorService {
+
+}

guice/src/main/java/com/baeldung/examples/common/BookService.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface BookService {
+
+}

guice/src/main/java/com/baeldung/examples/common/BookServiceImpl.java

@@ -0,0 +1,7 @@
+package com.baeldung.examples.common;
+
+public class BookServiceImpl implements BookService {
+
+	private AuthorService authorService;
+
+}

guice/src/main/java/com/baeldung/examples/common/PersonDao.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public interface PersonDao {
+
+}

guice/src/main/java/com/baeldung/examples/common/PersonDaoImpl.java

@@ -0,0 +1,5 @@
+package com.baeldung.examples.common;
+
+public class PersonDaoImpl implements PersonDao {
+
+}

guice/src/main/java/com/baeldung/examples/guice/Foo.java

@@ -0,0 +1,4 @@
+package com.baeldung.examples.guice;
+
+public class Foo {
+}

guice/src/main/java/com/baeldung/examples/guice/FooProcessor.java

@@ -0,0 +1,9 @@
+package com.baeldung.examples.guice;
+
+import com.google.inject.Inject;
+
+public class FooProcessor {
+
+	@Inject
+	private Foo foo;
+}

guice/src/main/java/com/baeldung/examples/guice/GuicePersonService.java

@@ -0,0 +1,19 @@
+package com.baeldung.examples.guice;
+
+import com.baeldung.examples.common.PersonDao;
+import com.google.inject.Inject;
+
+public class GuicePersonService {
+
+	@Inject
+	private PersonDao personDao;
+
+	public PersonDao getPersonDao() {
+		return personDao;
+	}
+
+	public void setPersonDao(PersonDao personDao) {
+		this.personDao = personDao;
+	}
+
+}

guice/src/main/java/com/baeldung/examples/guice/GuiceUserService.java

@@ -0,0 +1,19 @@
+package com.baeldung.examples.guice;
+
+import com.baeldung.examples.common.AccountService;
+import com.google.inject.Inject;
+
+public class GuiceUserService {
+
+	@Inject
+	private AccountService accountService;
+
+	public AccountService getAccountService() {
+		return accountService;
+	}
+
+	public void setAccountService(AccountService accountService) {
+		this.accountService = accountService;
+	}
+
+}

guice/src/main/java/com/baeldung/examples/guice/Person.java

@@ -0,0 +1,24 @@
+package com.baeldung.examples.guice;
+
+public class Person {
+	private String firstName;
+
+	private String lastName;
+
+	public String getFirstName() {
+		return firstName;
+	}
+
+	public void setFirstName(String firstName) {
+		this.firstName = firstName;
+	}
+
+	public String getLastName() {
+		return lastName;
+	}
+
+	public void setLastName(String lastName) {
+		this.lastName = lastName;
+	}
+
+}

guice/src/main/java/com/baeldung/examples/guice/modules/GuiceModule.java

@@ -0,0 +1,50 @@
+package com.baeldung.examples.guice.modules;
+
+import com.baeldung.examples.common.AccountService;
+import com.baeldung.examples.common.AccountServiceImpl;
+import com.baeldung.examples.common.BookService;
+import com.baeldung.examples.common.BookServiceImpl;
+import com.baeldung.examples.common.PersonDao;
+import com.baeldung.examples.common.PersonDaoImpl;
+import com.baeldung.examples.guice.Foo;
+import com.baeldung.examples.guice.Person;
+import com.google.inject.AbstractModule;
+import com.google.inject.Provider;
+import com.google.inject.Provides;
+
+public class GuiceModule extends AbstractModule {
+
+	@Override
+	protected void configure() {
+		try {
+			bind(AccountService.class).to(AccountServiceImpl.class);
+			bind(Person.class).toConstructor(Person.class.getConstructor());
+			// bind(Person.class).toProvider(new Provider<Person>() {
+			// public Person get() {
+			// Person p = new Person();
+			// return p;
+			// }
+			// });
+			bind(Foo.class).toProvider(new Provider<Foo>() {
+				public Foo get() {
+					return new Foo();
+				}
+			});
+			bind(PersonDao.class).to(PersonDaoImpl.class);
+
+		} catch (NoSuchMethodException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} catch (SecurityException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+
+	}
+
+	@Provides
+	public BookService bookServiceGenerator() {
+		return new BookServiceImpl();
+	}
+
+}

guice/src/test/java/com/baeldung/examples/GuiceUnitTest.java

@@ -0,0 +1,61 @@
+package com.baeldung.examples;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+
+import com.baeldung.examples.common.BookService;
+import com.baeldung.examples.guice.FooProcessor;
+import com.baeldung.examples.guice.GuicePersonService;
+import com.baeldung.examples.guice.GuiceUserService;
+import com.baeldung.examples.guice.Person;
+import com.baeldung.examples.guice.modules.GuiceModule;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+
+public class GuiceUnitTest {
+
+	@Test
+	public void givenAccountServiceInjectedInGuiceUserService_WhenGetAccountServiceInvoked_ThenReturnValueIsNotNull() {
+		Injector injector = Guice.createInjector(new GuiceModule());
+		GuiceUserService guiceUserService = injector.getInstance(GuiceUserService.class);
+		assertNotNull(guiceUserService.getAccountService());
+	}
+
+	@Test
+	public void givenBookServiceIsRegisteredInModule_WhenBookServiceIsInjected_ThenReturnValueIsNotNull() {
+		Injector injector = Guice.createInjector(new GuiceModule());
+		BookService bookService = injector.getInstance(BookService.class);
+		assertNotNull(bookService);
+	}
+
+	@Test
+	public void givenMultipleBindingsForPerson_WhenPersonIsInjected_ThenTestFailsByProvisionException() {
+		Injector injector = Guice.createInjector(new GuiceModule());
+		Person person = injector.getInstance(Person.class);
+		assertNotNull(person);
+	}
+
+	@Test
+	public void givenFooInjectedToFooProcessorAsOptionalDependency_WhenFooProcessorIsRetrievedFromContext_ThenCreationExceptionIsNotThrown() {
+		Injector injector = Guice.createInjector(new GuiceModule());
+		FooProcessor fooProcessor = injector.getInstance(FooProcessor.class);
+		assertNotNull(fooProcessor);
+	}
+
+	@Test
+	public void givenGuicePersonServiceConstructorAnnotatedByInject_WhenGuicePersonServiceIsInjected_ThenInstanceWillBeCreatedFromTheConstructor() {
+		Injector injector = Guice.createInjector(new GuiceModule());
+		GuicePersonService personService = injector.getInstance(GuicePersonService.class);
+		assertNotNull(personService);
+	}
+
+	@Test
+	public void givenPersonDaoInjectedToGuicePersonServiceBySetterInjection_WhenGuicePersonServiceIsInjected_ThenPersonDaoInitializedByTheSetter() {
+		Injector injector = Guice.createInjector(new GuiceModule());
+		GuicePersonService personService = injector.getInstance(GuicePersonService.class);
+		assertNotNull(personService);
+		assertNotNull(personService.getPersonDao());
+	}
+
+}

jackson/README.md

@@ -37,3 +37,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Serialize Only Fields that meet a Custom Criteria with Jackson](http://www.baeldung.com/jackson-serialize-field-custom-criteria)
 - [Mapping Nested Values with Jackson](http://www.baeldung.com/jackson-nested-values)
 - [Convert XML to JSON Using Jackson](https://www.baeldung.com/jackson-convert-xml-json)
+- [Deserialize Immutable Objects with Jackson](https://www.baeldung.com/jackson-deserialize-immutable-objects)

java-collections-maps/README.md

@@ -19,3 +19,4 @@
 - [How to Check If a Key Exists in a Map](https://www.baeldung.com/java-map-key-exists)
 - [Comparing Two HashMaps in Java](https://www.baeldung.com/java-compare-hashmaps)
 - [Immutable Map Implementations in Java](https://www.baeldung.com/java-immutable-maps) 
+- [Map to String Conversion in Java](https://www.baeldung.com/java-map-to-string-conversion)

java-dates/README.md

@@ -27,4 +27,5 @@
 - [Convert Between java.time.Instant and java.sql.Timestamp](https://www.baeldung.com/java-time-instant-to-java-sql-timestamp)
 - [Convert between String and Timestamp](https://www.baeldung.com/java-string-to-timestamp)
 - [A Guide to SimpleDateFormat](https://www.baeldung.com/java-simple-date-format)
-- [ZoneOffset in Java](https://www.baeldung.com/java-zone-offset)
+- [ZoneOffset in Java](https://www.baeldung.com/java-zone-offset)
+- [Differences Between ZonedDateTime and OffsetDateTime](https://www.baeldung.com/java-zoneddatetime-offsetdatetime)

java-streams/README.md

@@ -16,3 +16,4 @@
 - [Introduction to Protonpack](https://www.baeldung.com/java-protonpack)
 - [Java Stream Filter with Lambda Expression](https://www.baeldung.com/java-stream-filter-lambda)
 - [Counting Matches on a Stream Filter](https://www.baeldung.com/java-stream-filter-count)
+- [Java 8 Streams peek() API](https://www.baeldung.com/java-streams-peek-api)

java-strings/README.md

@@ -50,3 +50,6 @@
 - [Remove Leading and Trailing Characters from a String](https://www.baeldung.com/java-remove-trailing-characters)
 - [Concatenating Strings In Java](https://www.baeldung.com/java-strings-concatenation)
 - [Java toString() Method](https://www.baeldung.com/java-tostring)
+- [Java String Interview Questions and Answers](https://www.baeldung.com/java-string-interview-questions)
+- [Check if a String is a Pangram in Java](https://www.baeldung.com/java-string-pangram)
+- [Check If a String Contains Multiple Keywords](https://www.baeldung.com/string-contains-multiple-words)

kotlin-libraries/README.md

@@ -9,3 +9,4 @@
 - [Working with Dates in Kotlin](https://www.baeldung.com/kotlin-dates)
 - [Introduction to Arrow in Kotlin](https://www.baeldung.com/kotlin-arrow)
 - [Kotlin with Ktor](https://www.baeldung.com/kotlin-ktor)
+- [REST API With Kotlin and Kovert](https://www.baeldung.com/kotlin-kovert)

libraries-server/README.md

@@ -7,3 +7,4 @@
 - [Creating and Configuring Jetty 9 Server in Java](http://www.baeldung.com/jetty-java-programmatic)
 - [Testing Netty with EmbeddedChannel](http://www.baeldung.com/testing-netty-embedded-channel)
 - [MQTT Client in Java](https://www.baeldung.com/java-mqtt-client)
+- [Guide to XMPP Smack Client](https://www.baeldung.com/xmpp-smack-chat-client)

libraries/README.md

@@ -64,7 +64,8 @@
 - [Exactly Once Processing in Kafka](https://www.baeldung.com/kafka-exactly-once)
 - [An Introduction to SuanShu](https://www.baeldung.com/suanshu)
 - [Implementing a FTP-Client in Java](http://www.baeldung.com/java-ftp-client)
-- [Introduction to Functional Java](https://www.baeldung.com/java-functional-library
+- [Introduction to Functional Java](https://www.baeldung.com/java-functional-library)
+- [Intro to Derive4J](https://www.baeldung.com/derive4j)
 
 The libraries module contains examples related to small libraries that are relatively easy to use and does not require any separate module of its own.
 

persistence-modules/java-jpa/README.md

@@ -5,3 +5,4 @@
 - [Fixing the JPA error “java.lang.String cannot be cast to Ljava.lang.String;”](https://www.baeldung.com/jpa-error-java-lang-string-cannot-be-cast) 
 - [JPA Entity Graph](https://www.baeldung.com/jpa-entity-graph)
 - [JPA 2.2 Support for Java 8 Date/Time Types](https://www.baeldung.com/jpa-java-time)
+- [Converting Between LocalDate and SQL Date](https://www.baeldung.com/java-convert-localdate-sql-date)

persistence-modules/spring-boot-persistence/README.MD

@@ -6,4 +6,4 @@
 - [Configuring a Tomcat Connection Pool in Spring Boot](https://www.baeldung.com/spring-boot-tomcat-connection-pool)
 - [Hibernate Field Naming with Spring Boot](https://www.baeldung.com/hibernate-field-naming-spring-boot)
 - [Integrating Spring Boot with HSQLDB](https://www.baeldung.com/spring-boot-hsqldb)
-
+- [Configuring a DataSource Programmatically in Spring Boot](https://www.baeldung.com/spring-boot-configure-data-source-programmatic)

persistence-modules/spring-data-jpa/README.md

@@ -19,6 +19,7 @@
 - [Sorting Query Results with Spring Data](https://www.baeldung.com/spring-data-sorting)
 - [INSERT Statement in JPA](https://www.baeldung.com/jpa-insert)
 - [Pagination and Sorting using Spring Data JPA](https://www.baeldung.com/spring-data-jpa-pagination-sorting)
+- [Spring Data JPA Query by Example](https://www.baeldung.com/spring-data-query-by-example)
 
 ### Eclipse Config 
 After importing the project into Eclipse, you may see the following error:  

spring-5-reactive-oauth/README.md

@@ -1,3 +1,4 @@
 ### Relevant Articles: 
 
 - [Spring Security OAuth Login with WebFlux](https://www.baeldung.com/spring-oauth-login-webflux)
+- [Spring WebClient and OAuth2 Support](https://www.baeldung.com/spring-webclient-oauth2)

spring-boot-bootstrap/README.md

@@ -5,3 +5,4 @@
 - [Deploying a Spring Boot Application to Cloud Foundry](https://www.baeldung.com/spring-boot-app-deploy-to-cloud-foundry)
 - [Deploy a Spring Boot Application to Google App Engine](https://www.baeldung.com/spring-boot-google-app-engine)
 - [Deploy a Spring Boot Application to OpenShift](https://www.baeldung.com/spring-boot-deploy-openshift)
+- [Deploy a Spring Boot Application to AWS Beanstalk](https://www.baeldung.com/spring-boot-deploy-aws-beanstalk)

spring-boot-mvc/README.md

@@ -9,4 +9,5 @@
 - [Display RSS Feed with Spring MVC](http://www.baeldung.com/spring-mvc-rss-feed)
 - [A Controller, Service and DAO Example with Spring Boot and JSF](https://www.baeldung.com/jsf-spring-boot-controller-service-dao)
 - [Cache Eviction in Spring Boot](https://www.baeldung.com/spring-boot-evict-cache)
-- [Setting Up Swagger 2 with a Spring REST API](http://www.baeldung.com/swagger-2-documentation-for-spring-rest-api)
+- [Setting Up Swagger 2 with a Spring REST API](http://www.baeldung.com/swagger-2-documentation-for-spring-rest-api)
+- [Conditionally Enable Scheduled Jobs in Spring](https://www.baeldung.com/spring-scheduled-enabled-conditionally)

spring-core/README.md

@@ -22,3 +22,4 @@
 - [Spring Application Context Events](https://www.baeldung.com/spring-context-events)
 - [Unsatisfied Dependency in Spring](https://www.baeldung.com/spring-unsatisfied-dependency)
 - [What is a Spring Bean?](https://www.baeldung.com/spring-bean)
+- [Spring PostConstruct and PreDestroy Annotations](https://www.baeldung.com/spring-postconstruct-predestroy)

spring-core/src/main/java/com/baeldung/di/spring/Account.java

@@ -0,0 +1,27 @@
+package com.baeldung.di.spring;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class Account {
+
+	private String accountNumber;
+	private String type;
+
+	public String getAccountNumber() {
+		return accountNumber;
+	}
+
+	public void setAccountNumber(String accountNumber) {
+		this.accountNumber = accountNumber;
+	}
+
+	public String getType() {
+		return type;
+	}
+
+	public void setType(String type) {
+		this.type = type;
+	}
+
+}

spring-core/src/main/java/com/baeldung/di/spring/AccountService.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public interface AccountService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/AccountServiceImpl.java

@@ -0,0 +1,8 @@
+package com.baeldung.di.spring;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class AccountServiceImpl implements AccountService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/AudioBookService.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public interface AudioBookService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/AudioBookServiceImpl.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public class AudioBookServiceImpl implements AudioBookService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/AuthorService.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public interface AuthorService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/AuthorServiceImpl.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public class AuthorServiceImpl implements AuthorService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/BookService.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public interface BookService {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/BookServiceImpl.java

@@ -0,0 +1,10 @@
+package com.baeldung.di.spring;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class BookServiceImpl implements BookService {
+
+	@Autowired(required = false)
+	private AuthorService authorService;
+
+}

spring-core/src/main/java/com/baeldung/di/spring/Foo.java

@@ -0,0 +1,4 @@
+package com.baeldung.di.spring;
+
+public class Foo {
+}

spring-core/src/main/java/com/baeldung/di/spring/FooProcessor.java

@@ -0,0 +1,6 @@
+package com.baeldung.di.spring;
+
+public class FooProcessor {
+
+	private Foo foo;
+}

spring-core/src/main/java/com/baeldung/di/spring/PersonDao.java

@@ -0,0 +1,5 @@
+package com.baeldung.di.spring;
+
+public interface PersonDao {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/PersonDaoImpl.java

@@ -0,0 +1,8 @@
+package com.baeldung.di.spring;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class PersonDaoImpl implements PersonDao {
+
+}

spring-core/src/main/java/com/baeldung/di/spring/SpringBeansConfig.java

@@ -0,0 +1,14 @@
+package com.baeldung.di.spring;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class SpringBeansConfig {
+
+	@Bean
+	public AudioBookService audioBookServiceGenerator() {
+		return new AudioBookServiceImpl();
+	}
+
+}

spring-core/src/main/java/com/baeldung/di/spring/SpringMainConfig.java

@@ -0,0 +1,18 @@
+package com.baeldung.di.spring;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+
+@Configuration
+@Import({ SpringBeansConfig.class })
+@ComponentScan("com.baeldung.di.spring")
+public class SpringMainConfig {
+
+	@Bean
+	public BookService bookServiceGenerator() {
+		return new BookServiceImpl();
+	}
+
+}

spring-core/src/main/java/com/baeldung/di/spring/SpringPersonService.java

@@ -0,0 +1,20 @@
+package com.baeldung.di.spring;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SpringPersonService {
+
+    @Autowired
+    private PersonDao personDao;
+
+    public PersonDao getPersonDao() {
+        return personDao;
+    }
+
+    public void setPersonDao(PersonDao personDao) {
+        this.personDao = personDao;
+    }
+
+}

spring-core/src/main/java/com/baeldung/di/spring/UserService.java

@@ -0,0 +1,20 @@
+package com.baeldung.di.spring;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class UserService {
+
+	@Autowired
+	private AccountService accountService;
+
+	public AccountService getAccountService() {
+		return accountService;
+	}
+
+	public void setAccountService(AccountService accountService) {
+		this.accountService = accountService;
+	}
+
+}

spring-core/src/test/java/com/baeldung/di/spring/SpringUnitTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.di.spring;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = { SpringMainConfig.class })
+public class SpringUnitTest {
+	@Autowired
+	ApplicationContext context;
+
+	@Test
+	public void givenAccountServiceAutowiredToUserService_WhenGetAccountServiceInvoked_ThenReturnValueIsNotNull() {
+		UserService userService = context.getBean(UserService.class);
+		assertNotNull(userService.getAccountService());
+	}
+
+	@Test
+	public void givenBookServiceIsRegisteredAsBeanInContext_WhenBookServiceIsRetrievedFromContext_ThenReturnValueIsNotNull() {
+		BookService bookService = context.getBean(BookService.class);
+		assertNotNull(bookService);
+	}
+
+	@Test
+	public void givenBookServiceIsRegisteredAsBeanInContextByOverridingAudioBookService_WhenAudioBookServiceIsRetrievedFromContext_ThenNoSuchBeanDefinitionExceptionIsThrown() {
+		BookService bookService = context.getBean(BookService.class);
+		assertNotNull(bookService);
+		AudioBookService audioBookService = context.getBean(AudioBookService.class);
+		assertNotNull(audioBookService);
+	}
+
+	@Test
+	public void givenAuthorServiceAutowiredToBookServiceAsOptionalDependency_WhenBookServiceIsRetrievedFromContext_ThenNoSuchBeanDefinitionExceptionIsNotThrown() {
+		BookService bookService = context.getBean(BookService.class);
+		assertNotNull(bookService);
+	}
+
+	@Test
+	public void givenSpringPersonServiceConstructorAnnotatedByAutowired_WhenSpringPersonServiceIsRetrievedFromContext_ThenInstanceWillBeCreatedFromTheConstructor() {
+		SpringPersonService personService = context.getBean(SpringPersonService.class);
+		assertNotNull(personService);
+	}
+
+	@Test
+	public void givenPersonDaoAutowiredToSpringPersonServiceBySetterInjection_WhenSpringPersonServiceRetrievedFromContext_ThenPersonDaoInitializedByTheSetter() {
+		SpringPersonService personService = context.getBean(SpringPersonService.class);
+		assertNotNull(personService);
+		assertNotNull(personService.getPersonDao());
+	}
+
+}

spring-security-mvc-jsonview/src/main/java/com/baeldung/spring/SecurityJsonViewControllerAdvice.java

@@ -31,6 +31,7 @@ public class SecurityJsonViewControllerAdvice extends AbstractMappingJacksonResp
                     .collect(Collectors.toList());
             if (jsonViews.size() == 1) {
                 bodyContainer.setSerializationView(jsonViews.get(0));
+                return;
             }
             throw new IllegalArgumentException("Ambiguous @JsonView declaration for roles "+ authorities.stream().map(GrantedAuthority::getAuthority).collect(Collectors.joining(",")));
         }

testing-modules/junit-5/README.md

@@ -16,3 +16,4 @@
 - [Running JUnit Tests Programmatically, from a Java Application](https://www.baeldung.com/junit-tests-run-programmatically-from-java)
 - [Testing an Abstract Class With JUnit](https://www.baeldung.com/junit-test-abstract-class)
 - [A Quick JUnit vs TestNG Comparison](http://www.baeldung.com/junit-vs-testng)
+- [Guide to JUnit 5 Parameterized Tests](https://www.baeldung.com/parameterized-tests-junit-5)