Java 8 introduced Optional<T> as a container object which may contain null values. It’s often used to indicate to a caller that a value might be null and that it need to be handled to avoid NullPointerExceptions. Sounds pretty useful, right? So why not use them in your persistence layer for optional entity attributes or…
Since version 5.2, Hibernate starts to use Java 8 classes in their proprietary APIs. The JPA standard will most likely do the same with version 2.2, but who knows when we will get that. Until then, Hibernate’s proprietary APIs are all we have, and I will present the most interesting changes here on the blog….
It happens quite often that you have to load multiple entities by their primary keys. And new developers are often surprised when they learn that JPA and Hibernate versions before 5.1 do not offer a simple API for it. With JPA and older Hibernate versions, you have 2 options to fetch multiple entities from the database: You…
Representing associations between entities as attributes is one of the most comfortable and popular features of JPA and Hibernate. It makes it very easy to navigate from one entity to one or more associated entities in your Java code, like from a Person entity to the corresponding Address entity. You can also use the association…