eugenp · anastasiosioannidis · Mar 13, 2025 · Mar 3, 2025 · Mar 3, 2025 · Mar 3, 2025
diff --git a/spring-boot-modules/spring-boot-3-2/README.md b/spring-boot-modules/spring-boot-3-2/README.md
@@ -1,8 +1,9 @@
 ## Relevant Articles
 - [Spring Boot 3.1’s ConnectionDetails Abstraction](https://www.baeldung.com/spring-boot-3-1-connectiondetails-abstraction)
 - [@ConditionalOnThreading Annotation Spring](https://www.baeldung.com/spring-conditionalonthreading)
-- [A Guide to RestClient in Spring Boot](https://www.baeldung.com/spring-boot-restclient)
 - [The SpringJUnitConfig and SpringJUnitWebConfig Annotations in Spring](https://www.baeldung.com/spring-5-junit-config)
-- [Singleton Design Pattern vs Singleton Beans in Spring Boot](https://www.baeldung.com/spring-boot-singleton-vs-beans)
+- [HTTP Interface in Spring 6](https://www.baeldung.com/spring-6-http-interface)
+- [Docker Compose Support in Spring Boot 3](https://www.baeldung.com/docker-compose-support-spring-boot)
+- [A Guide to Fallback Beans in Spring Framework](https://www.baeldung.com/spring-fallback-beans)
 
 - More articles: [[<-- prev]](/spring-boot-modules/spring-boot-3)
diff --git a/spring-boot-modules/spring-boot-3-2/pom.xml b/spring-boot-modules/spring-boot-3-2/pom.xml
@@ -151,12 +151,10 @@
         <dependency>
             <groupId>org.springframework.kafka</groupId>
             <artifactId>spring-kafka</artifactId>
-            <version>${spring-kafka.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.kafka</groupId>
             <artifactId>spring-kafka-test</artifactId>
-            <version>${spring-kafka.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -266,7 +264,9 @@
         <lombok-mapstruct-binding.version>0.2.0</lombok-mapstruct-binding.version>
         <jedis.version>5.0.2</jedis.version>
         <spring-kafka.version>3.1.2</spring-kafka.version>
-        <spring-boot.version>3.2.4</spring-boot.version>
+        <spring-boot.version>3.4.1</spring-boot.version>
+        <logback.version>1.5.16</logback.version>
+        <org.slf4j.version>2.0.16</org.slf4j.version>
         <springdoc-openapi-webmvc-ui.version>2.5.0</springdoc-openapi-webmvc-ui.version>
     </properties>
 

diff --git a/...ckercompose/DockerComposeApplication.java → ...ckercompose/DockerComposeApplication.java b/...ckercompose/DockerComposeApplication.java → ...ckercompose/DockerComposeApplication.java
diff --git a/...ung/dockercompose/config/MongoConfig.java → ...ung/dockercompose/config/MongoConfig.java b/...ung/dockercompose/config/MongoConfig.java → ...ung/dockercompose/config/MongoConfig.java
diff --git a/...kercompose/controller/ItemController.java → ...kercompose/controller/ItemController.java b/...kercompose/controller/ItemController.java → ...kercompose/controller/ItemController.java
diff --git a/...om/baeldung/dockercompose/model/Item.java → ...om/baeldung/dockercompose/model/Item.java b/...om/baeldung/dockercompose/model/Item.java → ...om/baeldung/dockercompose/model/Item.java
diff --git a/...kercompose/repository/ItemRepository.java → ...kercompose/repository/ItemRepository.java b/...kercompose/repository/ItemRepository.java → ...kercompose/repository/ItemRepository.java
diff --git a/...eldung/fallback/MessagingApplication.java → ...eldung/fallback/MessagingApplication.java b/...eldung/fallback/MessagingApplication.java → ...eldung/fallback/MessagingApplication.java
diff --git a/...essaging/DevelopmentMessagingService.java → ...essaging/DevelopmentMessagingService.java b/...essaging/DevelopmentMessagingService.java → ...essaging/DevelopmentMessagingService.java
diff --git a/...k/messaging/FallbackMessagingService.java → ...k/messaging/FallbackMessagingService.java b/...k/messaging/FallbackMessagingService.java → ...k/messaging/FallbackMessagingService.java
diff --git a/.../fallback/messaging/MessagingService.java → .../fallback/messaging/MessagingService.java b/.../fallback/messaging/MessagingService.java → .../fallback/messaging/MessagingService.java
diff --git a/...messaging/ProductionMessagingService.java → ...messaging/ProductionMessagingService.java b/...messaging/ProductionMessagingService.java → ...messaging/ProductionMessagingService.java
diff --git a/...java/com/baeldung/httpinterface/Book.java → ...java/com/baeldung/httpinterface/Book.java b/...java/com/baeldung/httpinterface/Book.java → ...java/com/baeldung/httpinterface/Book.java
diff --git a/...m/baeldung/httpinterface/BooksClient.java → ...m/baeldung/httpinterface/BooksClient.java b/...m/baeldung/httpinterface/BooksClient.java → ...m/baeldung/httpinterface/BooksClient.java
@@ -2,7 +2,6 @@
 
 import org.springframework.stereotype.Component;
 import org.springframework.web.reactive.function.client.WebClient;
-import org.springframework.web.reactive.function.client.support.WebClientAdapter;
 import org.springframework.web.service.invoker.HttpServiceProxyFactory;
 
 @Component

diff --git a/.../baeldung/httpinterface/BooksService.java → .../baeldung/httpinterface/BooksService.java b/.../baeldung/httpinterface/BooksService.java → .../baeldung/httpinterface/BooksService.java
@@ -1,14 +1,14 @@
 package com.baeldung.httpinterface;
 
+import java.util.List;
+
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.service.annotation.DeleteExchange;
 import org.springframework.web.service.annotation.GetExchange;
 import org.springframework.web.service.annotation.PostExchange;
 
-import java.util.List;
-
 interface BooksService {
 
     @GetExchange("/books")

diff --git a/...t-3/src/main/resources/docker-compose.yml → ...3-2/src/main/resources/docker-compose.yml b/...t-3/src/main/resources/docker-compose.yml → ...3-2/src/main/resources/docker-compose.yml
diff --git a/.../DevelopmentMessagingServiceUnitTest.java → .../DevelopmentMessagingServiceUnitTest.java b/.../DevelopmentMessagingServiceUnitTest.java → .../DevelopmentMessagingServiceUnitTest.java
@@ -1,16 +1,17 @@
 package com.baeldung.fallback;
 
-import com.baeldung.fallback.messaging.DevelopmentMessagingService;
-import com.baeldung.fallback.messaging.FallbackMessagingService;
-import com.baeldung.fallback.messaging.MessagingService;
-import com.baeldung.fallback.messaging.ProductionMessagingService;
+import static org.junit.Assert.assertEquals;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.junit4.SpringRunner;
 
-import static org.junit.Assert.assertEquals;
+import com.baeldung.fallback.messaging.DevelopmentMessagingService;
+import com.baeldung.fallback.messaging.FallbackMessagingService;
+import com.baeldung.fallback.messaging.MessagingService;
+import com.baeldung.fallback.messaging.ProductionMessagingService;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(classes = {FallbackMessagingService.class, DevelopmentMessagingService.class, ProductionMessagingService.class})

diff --git a/...ack/FallbackMessagingServiceUnitTest.java → ...ack/FallbackMessagingServiceUnitTest.java b/...ack/FallbackMessagingServiceUnitTest.java → ...ack/FallbackMessagingServiceUnitTest.java
@@ -1,17 +1,18 @@
 package com.baeldung.fallback;
 
-import com.baeldung.fallback.messaging.DevelopmentMessagingService;
-import com.baeldung.fallback.messaging.FallbackMessagingService;
-import com.baeldung.fallback.messaging.MessagingService;
-import com.baeldung.fallback.messaging.ProductionMessagingService;
+import static org.junit.Assert.assertEquals;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.junit4.SpringRunner;
 
-import static org.junit.Assert.assertEquals;
+import com.baeldung.fallback.messaging.DevelopmentMessagingService;
+import com.baeldung.fallback.messaging.FallbackMessagingService;
+import com.baeldung.fallback.messaging.MessagingService;
+import com.baeldung.fallback.messaging.ProductionMessagingService;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(classes = {FallbackMessagingService.class, DevelopmentMessagingService.class, ProductionMessagingService.class})

diff --git a/...k/ProductionMessagingServiceUnitTest.java → ...k/ProductionMessagingServiceUnitTest.java b/...k/ProductionMessagingServiceUnitTest.java → ...k/ProductionMessagingServiceUnitTest.java
@@ -1,17 +1,18 @@
 package com.baeldung.fallback;
 
-import com.baeldung.fallback.messaging.DevelopmentMessagingService;
-import com.baeldung.fallback.messaging.FallbackMessagingService;
-import com.baeldung.fallback.messaging.MessagingService;
-import com.baeldung.fallback.messaging.ProductionMessagingService;
+import static org.junit.Assert.assertEquals;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.junit4.SpringRunner;
 
-import static org.junit.Assert.assertEquals;
+import com.baeldung.fallback.messaging.DevelopmentMessagingService;
+import com.baeldung.fallback.messaging.FallbackMessagingService;
+import com.baeldung.fallback.messaging.MessagingService;
+import com.baeldung.fallback.messaging.ProductionMessagingService;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(classes = {FallbackMessagingService.class, DevelopmentMessagingService.class, ProductionMessagingService.class})

diff --git a/spring-boot-modules/spring-boot-3/README.md b/spring-boot-modules/spring-boot-3/README.md
@@ -4,8 +4,7 @@
 - [Spring Boot 3 and Spring Framework 6.0 – What’s New](https://www.baeldung.com/spring-boot-3-spring-6-new)
 - [Migrate Application From Spring Boot 2 to Spring Boot 3](https://www.baeldung.com/spring-boot-3-migration)
 - [Using Java Records with JPA](https://www.baeldung.com/spring-jpa-java-records)
-- [HTTP Interface in Spring 6](https://www.baeldung.com/spring-6-http-interface)
 - [Working with Virtual Threads in Spring 6](https://www.baeldung.com/spring-6-virtual-threads)
-- [Docker Compose Support in Spring Boot 3](https://www.baeldung.com/docker-compose-support-spring-boot)
-- [A Guide to Fallback Beans in Spring Framework](https://www.baeldung.com/spring-fallback-beans)
+- [A Guide to RestClient in Spring Boot](https://www.baeldung.com/spring-boot-restclient)
+- [Singleton Design Pattern vs Singleton Beans in Spring Boot](https://www.baeldung.com/spring-boot-singleton-vs-beans)
 - More articles: [[next -->]](/spring-boot-modules/spring-boot-3-2)
diff --git a/spring-boot-modules/spring-boot-3/pom.xml b/spring-boot-modules/spring-boot-3/pom.xml
@@ -18,52 +18,22 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-hateoas</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-validation</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-webflux</artifactId>
-            <version>${spring-boot.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter</artifactId>
-            <version>${junit-jupiter.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit-jupiter.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-engine</artifactId>
-            <version>${junit-jupiter.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-params</artifactId>
-            <version>${junit-jupiter.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.platform</groupId>
-            <artifactId>junit-platform-commons</artifactId>
-            <version>${junit-platform-commons.version}</version>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
@@ -73,14 +43,12 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>
-            <version>${spring-boot.version}</version>
             <scope>runtime</scope>
             <optional>true</optional>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-configuration-processor</artifactId>
-            <version>${spring-boot.version}</version>
             <optional>true</optional>
         </dependency>
         <dependency>
@@ -102,22 +70,18 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-docker-compose</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-mongodb</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-actuator</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
-            <version>${spring-boot.version}</version>
         </dependency>
     </dependencies>
 
@@ -145,20 +109,6 @@
                 </plugins>
             </build>
         </profile>
-        <profile>
-            <id>docker-compose</id>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.springframework.boot</groupId>
-                        <artifactId>spring-boot-maven-plugin</artifactId>
-                        <configuration>
-                            <mainClass>com.baeldung.dockercompose.DockerComposeApplication</mainClass>
-                        </configuration>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
     </profiles>
 
     <build>

diff --git a/...java/com/baeldung/restclient/Article.java → ...java/com/baeldung/restclient/Article.java b/...java/com/baeldung/restclient/Article.java → ...java/com/baeldung/restclient/Article.java
diff --git a/...aeldung/restclient/ArticleController.java → ...aeldung/restclient/ArticleController.java b/...aeldung/restclient/ArticleController.java → ...aeldung/restclient/ArticleController.java
diff --git a/.../restclient/ArticleNotFoundException.java → .../restclient/ArticleNotFoundException.java b/.../restclient/ArticleNotFoundException.java → .../restclient/ArticleNotFoundException.java
diff --git a/...ient/InvalidArticleResponseException.java → ...ient/InvalidArticleResponseException.java b/...ient/InvalidArticleResponseException.java → ...ient/InvalidArticleResponseException.java
diff --git a/...ung/restclient/RestClientApplication.java → ...ung/restclient/RestClientApplication.java b/...ung/restclient/RestClientApplication.java → ...ung/restclient/RestClientApplication.java
diff --git a/...eldung/singleton/SingletonBeanConfig.java → ...eldung/singleton/SingletonBeanConfig.java b/...eldung/singleton/SingletonBeanConfig.java → ...eldung/singleton/SingletonBeanConfig.java
diff --git a/...g/singleton/ThreadSafeSingleInstance.java → ...g/singleton/ThreadSafeSingleInstance.java b/...g/singleton/ThreadSafeSingleInstance.java → ...g/singleton/ThreadSafeSingleInstance.java
diff --git a/...t-modules/spring-boot-3/src/main/resources/connectiondetails/application-r2dbc.properties b/...t-modules/spring-boot-3/src/main/resources/connectiondetails/application-r2dbc.properties
@@ -0,0 +1,7 @@
+spring.docker.compose.enabled=true
+spring.docker.compose.file=./connectiondetails/docker/docker-compose-jdbc.yml
+spring.docker.compose.skip.in-tests=false
+spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
+spring.mustache.check-template-location=false
+spring.profiles.active=r2dbc
+spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration, org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration, org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration, org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration, org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration, org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration, org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration, org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration, org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration, org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration, org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration, org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration, org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration
diff --git a/...modules/spring-boot-3/src/main/resources/connectiondetails/docker/docker-compose-jdbc.yml b/...modules/spring-boot-3/src/main/resources/connectiondetails/docker/docker-compose-jdbc.yml
@@ -0,0 +1,10 @@
+version: '3.8'
+services:
+  database:
+    image: 'postgres:13.1-alpine'
+    ports:
+      - '15432:5432'
+    environment:
+      - 'POSTGRES_USER=postgres'
+      - 'POSTGRES_DB=postgresdb'
+      - 'POSTGRES_PASSWORD=postgres'
diff --git a/...pring-boot-3/src/test/java/com/baeldung/httpinterface/BooksServiceMockServerUnitTest.java b/...pring-boot-3/src/test/java/com/baeldung/httpinterface/BooksServiceMockServerUnitTest.java
diff --git a/...s/spring-boot-3/src/test/java/com/baeldung/httpinterface/BooksServiceMockitoUnitTest.java b/...s/spring-boot-3/src/test/java/com/baeldung/httpinterface/BooksServiceMockitoUnitTest.java
diff --git a/...ot-modules/spring-boot-3/src/test/java/com/baeldung/httpinterface/MyServiceException.java b/...ot-modules/spring-boot-3/src/test/java/com/baeldung/httpinterface/MyServiceException.java
diff --git a/...eldung/restclient/RestClientLiveTest.java → ...eldung/restclient/RestClientLiveTest.java b/...eldung/restclient/RestClientLiveTest.java → ...eldung/restclient/RestClientLiveTest.java
diff --git a/...dung/singleton/SingletonBeanUnitTest.java → ...dung/singleton/SingletonBeanUnitTest.java b/...dung/singleton/SingletonBeanUnitTest.java → ...dung/singleton/SingletonBeanUnitTest.java
@@ -1,14 +1,14 @@
 package com.baeldung.singleton;
 
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.ContextConfiguration;
 
-import static org.junit.jupiter.api.Assertions.assertNotSame;
-import static org.junit.jupiter.api.Assertions.assertSame;
-
 @SpringBootTest
 @ContextConfiguration(classes = SingletonBeanConfig.class)
 class SingletonBeanUnitTest {

diff --git a/...ton/ThreadSafeSingleInstanceUnitTest.java → ...ton/ThreadSafeSingleInstanceUnitTest.java b/...ton/ThreadSafeSingleInstanceUnitTest.java → ...ton/ThreadSafeSingleInstanceUnitTest.java
@@ -1,9 +1,9 @@
 package com.baeldung.singleton;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertSame;
 
+import org.junit.jupiter.api.Test;
+
 class ThreadSafeSingleInstanceUnitTest {
 
     @Test