How to synchronize bidirectional entity associations with JPA and Hibernate

Introduction While answering this StackOverflow question, I realized that it’s a good idea to summarize how various bidirectional associations should be synchronized when using JPA and Hibernate. Therefore, in this article, you are going to learn how and also why you should always synchronize both sides of an entity relationship, no matter if it’s @OneToMany, @OneToOne or @ManyToMany.

The best way to use the @ManyToMany annotation with JPA and Hibernate

Introduction As simple as JPA annotations might be, it’s not always obvious how efficient they are behind the scenes. In this article, I’m going to show you what is the best way to use the JPA @ManyToMany annotation when using Hibernate.

The best way to map a @OneToMany relationship with JPA and Hibernate

Introduction In a relational database system, a one-to-many association between links two tables based on a Foreign Key column so that the child table record references the Primary Key of the parent table row. As straightforward as it might be in a RDBMS, when it comes to JPA, the one-to-many database association can be represented either through a @ManyToOne or a @OneToMany association since the OOP association can be either unidirectional or bidirectional. The @ManyToOne annotation allows you to map the Foreign Key column in the child entity mapping so that the… Read More

Hypersistence Optimizer can automatically detect if you are using JPA and Hibernate properly