eugenp · anastasiosioannidis · Aug 23, 2025 · Aug 19, 2025 · Aug 19, 2025 · Aug 20, 2025
diff --git a/persistence-modules/pom.xml b/persistence-modules/pom.xml
@@ -130,7 +130,7 @@
         <module>spring-jdbc-2</module>
         <!--<module>spring-jooq</module>--><!--disabling the jooq modules, as the default build profile is failing due to bad mv files. Please refer: JAVA-31341-->
         <module>spring-mybatis</module>
-        <!-- <module>spring-persistence-simple</module> --> <!-- failing after upgrade to jdk21 -->
+        <!-- <module>spring-persistence</module> --> <!-- failing after upgrade to jdk21 -->
         <module>spring-data-yugabytedb</module>
         <module>fauna</module>
         <module>spring-data-rest</module>
@@ -146,6 +146,7 @@
         <module>hibernate-annotations-2</module>
         <module>hibernate-reactive</module>
         <module>spring-data-envers</module>
+        <module>spring-persistence-simple</module>
     </modules>
 
     <properties>

diff --git a/...les/spring-data-jpa-simple/src/main/java/com/baeldung/jpa/simple/service/IFooService.java b/...les/spring-data-jpa-simple/src/main/java/com/baeldung/jpa/simple/service/IFooService.java
diff --git a/.../spring-jdbc/src/main/java/com/baeldung/spring/jdbc/template/config/SpringJdbcConfig.java b/.../spring-jdbc/src/main/java/com/baeldung/spring/jdbc/template/config/SpringJdbcConfig.java
@@ -0,0 +1,36 @@
+package com.baeldung.spring.jdbc.template.config;
+
+import javax.sql.DataSource;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+
+@Configuration
+@ComponentScan("com.baeldung.spring.jdbc.template.guide")
+public class SpringJdbcConfig {
+
+    @Bean
+    public DataSource dataSource() {
+        return new EmbeddedDatabaseBuilder()
+          .setType(EmbeddedDatabaseType.H2)
+          .addScript("classpath:com/baeldung/spring/jdbc/template/guide/schema.sql")
+          .addScript("classpath:com/baeldung/spring/jdbc/template/guide/test-data.sql")
+          .build();
+    }
+
+    // @Bean
+    public DataSource mysqlDataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
+        dataSource.setUrl("jdbc:mysql://localhost:3306/springjdbc");
+        dataSource.setUsername("guest_user");
+        dataSource.setPassword("guest_password");
+
+        return dataSource;
+    }
+
+}
diff --git a/persistence-modules/spring-persistence-simple/pom.xml b/persistence-modules/spring-persistence-simple/pom.xml
@@ -9,101 +9,56 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>persistence-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <artifactId>parent-boot-3</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-3</relativePath>
     </parent>
 
     <dependencies>
-        <!-- Spring -->
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-orm</artifactId>
-            <version>${org.springframework.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-context</artifactId>
-            <version>${org.springframework.version}</version>
-        </dependency>
-        <!-- persistence -->
-        <dependency>
-            <groupId>javax.persistence</groupId>
-            <artifactId>javax.persistence-api</artifactId>
-            <version>${persistence-api.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.data</groupId>
-            <artifactId>spring-data-jpa</artifactId>
-            <version>${spring-data-jpa.version}</version>
-        </dependency>
-        <dependency>
-            <!-- JAVA-37421 cannot upgrade to Jakarta namespace -->
-            <groupId>javax.transaction</groupId>
-            <artifactId>javax.transaction-api</artifactId>
-            <version>${transaction-api.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-tx</artifactId>
-            <version>${org.springframework.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter</artifactId>
-            <version>${spring-boot-starter.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-jta-atomikos</artifactId>
-            <version>${spring-boot-starter.version}</version>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-jdbc</artifactId>
-            <version>${spring-boot-starter.version}</version>
         </dependency>
         <dependency>
-            <groupId>org.hsqldb</groupId>
-            <artifactId>hsqldb</artifactId>
-            <version>${hsqldb.version}</version>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-webmvc</artifactId>
+            <version>${org.springframework.version}</version>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2.version}</version>
-            <scope>test</scope>
         </dependency>
-        <!-- simple-jndi -->
         <dependency>
-            <groupId>com.github.h-thurow</groupId>
-            <artifactId>simple-jndi</artifactId>
-            <version>${simple-jndi.version}</version>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <scope>runtime</scope>
         </dependency>
-        <!-- test scoped -->
         <dependency>
             <groupId>org.springframework</groupId>
-            <artifactId>spring-test</artifactId>
+            <artifactId>spring-orm</artifactId>
             <version>${org.springframework.version}</version>
-            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <artifactId>commons-logging</artifactId>
+                    <groupId>commons-logging</groupId>
+                </exclusion>
+            </exclusions>
         </dependency>
+        <!-- utils -->
         <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
-            <scope>test</scope>
-            <version>${spring-boot-starter.version}</version>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
         </dependency>
     </dependencies>
 
     <properties>
-        <org.springframework.version>5.3.18</org.springframework.version>
-        <spring-boot-starter.version>2.6.6</spring-boot-starter.version>
-        <persistence-api.version>2.2</persistence-api.version>
-        <transaction-api.version>1.3</transaction-api.version>
-        <spring-data-jpa.version>2.2.7.RELEASE</spring-data-jpa.version>
-        <simple-jndi.version>0.23.0</simple-jndi.version>
-        <hsqldb.version>2.5.2</hsqldb.version>
-        <org.slf4j.version>1.7.32</org.slf4j.version>
-        <logback.version>1.2.7</logback.version>
+        <spring-boot.repackage.skip>true</spring-boot.repackage.skip>
+        <org.springframework.version>6.0.6</org.springframework.version>
     </properties>
 
 </project>
diff --git a/...e/guide/CustomSQLErrorCodeTranslator.java → ...e/guide/CustomSQLErrorCodeTranslator.java b/...e/guide/CustomSQLErrorCodeTranslator.java → ...e/guide/CustomSQLErrorCodeTranslator.java
diff --git a/.../spring/jdbc/template/guide/Employee.java → .../spring/jdbc/template/guide/Employee.java b/.../spring/jdbc/template/guide/Employee.java → .../spring/jdbc/template/guide/Employee.java
diff --git a/...ring/jdbc/template/guide/EmployeeDAO.java → ...ring/jdbc/template/guide/EmployeeDAO.java b/...ring/jdbc/template/guide/EmployeeDAO.java → ...ring/jdbc/template/guide/EmployeeDAO.java
diff --git a/...dbc/template/guide/EmployeeRowMapper.java → ...dbc/template/guide/EmployeeRowMapper.java b/...dbc/template/guide/EmployeeRowMapper.java → ...dbc/template/guide/EmployeeRowMapper.java
diff --git a/...mplate/guide/config/SpringJdbcConfig.java → ...mplate/guide/config/SpringJdbcConfig.java b/...mplate/guide/config/SpringJdbcConfig.java → ...mplate/guide/config/SpringJdbcConfig.java
diff --git a/...aeldung/spring/jpa/guide/JpaGuideApp.java → ...aeldung/spring/jpa/guide/JpaGuideApp.java b/...aeldung/spring/jpa/guide/JpaGuideApp.java → ...aeldung/spring/jpa/guide/JpaGuideApp.java
@@ -1,12 +1,13 @@
 package com.baeldung.spring.jpa.guide;
 
-import com.baeldung.spring.jpa.guide.model.Publishers;
-import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
 
+import com.baeldung.spring.jpa.guide.model.Publishers;
+import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
+
 @SpringBootApplication
 public class JpaGuideApp {
 

diff --git a/...pring/jpa/guide/PersistenceJPAConfig.java → ...pring/jpa/guide/PersistenceJPAConfig.java b/...pring/jpa/guide/PersistenceJPAConfig.java → ...pring/jpa/guide/PersistenceJPAConfig.java
@@ -1,6 +1,9 @@
 package com.baeldung.spring.jpa.guide;
 
-import com.google.common.base.Preconditions;
+import java.util.Properties;
+
+import javax.sql.DataSource;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -15,8 +18,7 @@
 import org.springframework.transaction.PlatformTransactionManager;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 
-import javax.sql.DataSource;
-import java.util.Properties;
+import com.google.common.base.Preconditions;
 
 @Configuration
 @EnableTransactionManagement

diff --git a/...spring/jpa/guide/PublisherController.java → ...spring/jpa/guide/PublisherController.java b/...spring/jpa/guide/PublisherController.java → ...spring/jpa/guide/PublisherController.java
diff --git a/...ng/spring/jpa/guide/model/Publishers.java → ...ng/spring/jpa/guide/model/Publishers.java b/...ng/spring/jpa/guide/model/Publishers.java → ...ng/spring/jpa/guide/model/Publishers.java
diff --git a/...guide/repository/PublisherRepository.java → ...guide/repository/PublisherRepository.java b/...guide/repository/PublisherRepository.java → ...guide/repository/PublisherRepository.java
@@ -1,9 +1,11 @@
 package com.baeldung.spring.jpa.guide.repository;
 
-import com.baeldung.spring.jpa.guide.model.Publishers;
+import java.util.List;
+
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
-import java.util.List;
+
+import com.baeldung.spring.jpa.guide.model.Publishers;
 
 public interface PublisherRepository extends JpaRepository<Publishers, Integer> {
 

diff --git a/...g/jpa/guide/service/PublisherService.java → ...g/jpa/guide/service/PublisherService.java b/...g/jpa/guide/service/PublisherService.java → ...g/jpa/guide/service/PublisherService.java
@@ -1,10 +1,11 @@
 package com.baeldung.spring.jpa.guide.service;
 
-import com.baeldung.spring.jpa.guide.model.Publishers;
-import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
+import java.util.List;
+
 import org.springframework.stereotype.Service;
 
-import java.util.List;
+import com.baeldung.spring.jpa.guide.model.Publishers;
+import com.baeldung.spring.jpa.guide.repository.PublisherRepository;
 
 @Service
 public class PublisherService {

diff --git a/...es/spring-persistence-simple/src/main/java/com/baeldung/spring/simple/JpaApplication.java b/...es/spring-persistence-simple/src/main/java/com/baeldung/spring/simple/JpaApplication.java
@@ -0,0 +1,16 @@
+package com.baeldung.spring.simple;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.domain.EntityScan;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+
+@SpringBootApplication
+@EnableJpaRepositories("com.baeldung.spring.simple.repository")
+public class JpaApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(JpaApplication.class, args);
+    }
+
+}
diff --git a/...persistence-simple/src/main/java/com/baeldung/spring/simple/config/PersistenceConfig.java b/...persistence-simple/src/main/java/com/baeldung/spring/simple/config/PersistenceConfig.java
@@ -0,0 +1,75 @@
+package com.baeldung.spring.simple.config;
+
+import java.util.Properties;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import com.google.common.base.Preconditions;
+
+@Configuration
+@PropertySource("classpath:persistence.properties")
+@EnableTransactionManagement
+//@ImportResource("classpath*:*springDataConfig.xml")
+public class PersistenceConfig {
+
+    @Autowired
+    private Environment env;
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(dataSource());
+        em.setPackagesToScan("com.baeldung.spring.simple.model");
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        em.setJpaVendorAdapter(vendorAdapter);
+        em.setJpaProperties(additionalProperties());
+
+        return em;
+    }
+
+    @Bean
+    public DataSource dataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Bean
+    public PlatformTransactionManager transactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
+
+        return transactionManager;
+    }
+
+    @Bean
+    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
+        return new PersistenceExceptionTranslationPostProcessor();
+    }
+
+    final Properties additionalProperties() {
+        final Properties hibernateProperties = new Properties();
+        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+
+        return hibernateProperties;
+    }
+}
diff --git a/...va/com/baeldung/jpa/simple/model/Foo.java → ...com/baeldung/spring/simple/model/Foo.java b/...va/com/baeldung/jpa/simple/model/Foo.java → ...com/baeldung/spring/simple/model/Foo.java
@@ -1,4 +1,4 @@
-package com.baeldung.jpa.simple.model;
+package com.baeldung.spring.simple.model;
 
 import java.io.Serializable;
 

diff --git a/...eldung/jpa/simple/repository/IFooDAO.java → ...ung/spring/simple/repository/IFooDAO.java b/...eldung/jpa/simple/repository/IFooDAO.java → ...ung/spring/simple/repository/IFooDAO.java
@@ -1,10 +1,10 @@
-package com.baeldung.jpa.simple.repository;
+package com.baeldung.spring.simple.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
-import com.baeldung.jpa.simple.model.Foo;
+import com.baeldung.spring.simple.model.Foo;
 
 public interface IFooDAO extends JpaRepository<Foo, Long> {
 

diff --git a/...eldung/jpa/simple/service/FooService.java → ...ung/spring/simple/service/FooService.java b/...eldung/jpa/simple/service/FooService.java → ...ung/spring/simple/service/FooService.java
@@ -1,10 +1,10 @@
-package com.baeldung.jpa.simple.service;
+package com.baeldung.spring.simple.service;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
-import com.baeldung.jpa.simple.model.Foo;
-import com.baeldung.jpa.simple.repository.IFooDAO;
+import com.baeldung.spring.simple.model.Foo;
+import com.baeldung.spring.simple.repository.IFooDAO;
 
 @Service
 public class FooService implements IFooService {

diff --git a/...ring-persistence-simple/src/main/java/com/baeldung/spring/simple/service/IFooService.java b/...ring-persistence-simple/src/main/java/com/baeldung/spring/simple/service/IFooService.java
@@ -0,0 +1,7 @@
+package com.baeldung.spring.simple.service;
+
+import com.baeldung.spring.simple.model.Foo;
+
+public interface IFooService {
+    Foo create(Foo foo);
+}
diff --git a/.../template/guide/application-h2.properties → .../template/guide/application-h2.properties b/.../template/guide/application-h2.properties → .../template/guide/application-h2.properties
diff --git a/...mplate/guide/application-mysql.properties → ...mplate/guide/application-mysql.properties b/...mplate/guide/application-mysql.properties → ...mplate/guide/application-mysql.properties
diff --git a/...dbc/template/guide/application.properties → ...dbc/template/guide/application.properties b/...dbc/template/guide/application.properties → ...dbc/template/guide/application.properties
diff --git a/...ung/spring/jdbc/template/guide/schema.sql → ...ung/spring/jdbc/template/guide/schema.sql b/...ung/spring/jdbc/template/guide/schema.sql → ...ung/spring/jdbc/template/guide/schema.sql
diff --git a/.../spring/jdbc/template/guide/test-data.sql → .../spring/jdbc/template/guide/test-data.sql b/.../spring/jdbc/template/guide/test-data.sql → .../spring/jdbc/template/guide/test-data.sql
diff --git a/persistence-modules/spring-persistence-simple/src/main/resources/persistence.properties b/persistence-modules/spring-persistence-simple/src/main/resources/persistence.properties
@@ -0,0 +1,9 @@
+# jdbc.X
+jdbc.driverClassName=org.h2.Driver
+jdbc.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
+jdbc.user=sa
+jdbc.pass=sa
+
+# hibernate.X
+hibernate.hbm2ddl.auto=create-drop
+hibernate.dialect=org.hibernate.dialect.H2Dialect