When using Spring Data JPA, most developers are used to letting Spring handle almost all database operations. That’s especially the case for all update operations. Thanks to JPA’s entity mappings and the managed lifecycle of all entity objects, you only need to change an attribute of an entity object. Everything else happens automatically. But having…
I’ve great news to share. Today I’m announcing the Persistence Hub and giving you a first glimpse inside. 2 weeks ago, I announced that we stop offering online courses as one-off purchases. Instead, we will offer a membership including all my courses, a community forum, and interactive live events. Combining all of these will provide…
Since Spring Data JPA 1.11 (the Ingalls release), you can automatically publish domain events when an entity object gets saved. You only need to add a method to your entity class that returns a Collection of the event objects you want to publish and annotate the method with @DomainEvents. Spring Data JPA calls that method and publishes the events…
DTO projections provide better performance than entities if you only want to read but not change the retrieved information. They avoid the management overhead of an entity class and enable you to only select the database columns your business code needs. But as so often, DTO projections also have a downside, and that’s the handling…
Inheritance is one of the key concepts of all object-oriented programming languages. And Java makes there no difference. All developers are familiar with this concept and expect to use it in all parts of their code. That, of course, also includes the persistence layer and the entity model. But the concept of inheritance doesn’t exist…
