<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/mydb" /> <property name="username" value="root" /> <property name="password" value="password" /> </bean> <context:component-scan base-package="com.example.entity" /> @Entity @Table(name = "my_table") public class MyEntity { // ... } <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <tx:annotation-driven transaction-manager="transactionManager" /> @Transactional public class MyService { // ... } @Entity public class ParentEntity { // ... @OneToOne private ChildEntity child; // ... } @Entity public class ChildEntity { // ... } @Entity public class EntityA { // ... @ManyToMany private List<EntityB> entitiesB; // ... } @Entity public class EntityB { // ... }