Posted on May 2, 2018 by vladmihalcea
How to use @PrePersist and @PreUpdate on Embeddable with JPA and Hibernate
Introduction In a previous article, I explained how you could audit entity modifications using the JPA @EntityListeners for embeddable types. Since Hibernate ORM 5.2.17 now allows you to use the @PrePersist and @PreUpdate JPA entity listeners, we can simplify the previous example, as you will see in this article.
Posted on November 20, 2017 by vladmihalcea
How to audit entity modifications using the JPA @EntityListeners, @Embedded, and @Embeddable annotations
Introduction In this article, we are going to see how we can use the @EntityListeners, @Embedded, and @Embeddable annotations with JPA and Hibernate to audit entity modifications. After I wrote the article about inheriting properties from a base class entity using @MappedSuperclass, I got an avalanche of opinions, but this one from Lukas deserves a blog post: While @MappedSuperclass has its benefit, allowing you to reuse even the @Id mapping, as well as being more lenient towards Hibernate-specific auto-generated properties like @GeneratedValue, using Embeddable types is the other JPA alternative for reusing… Read More
Posted on July 26, 2017 by vladmihalcea
The best way to map a JPA and Hibernate many-to-many association with extra columns
Introduction For a simple many-to-many database relationship, you can use the @ManyToMany JPA annotation and, therefore, hide the join table. However, sometimes you need more than the two Foreign Key columns in the join table, and, for this purpose, you need to replace the @ManyToMany association with two bidirectional @OneToMany associations. Unlike unidirectional @OneToMany, the bidirectional relationship is the best way to map a one-to-many database relationship that requires a collection of Child elements on the parent side In this article, we are going to see how you can map a many-to-many… Read More
