The awesome BaseJpaRepository from Hypersistence Utils

Introduction In this article, I’m going to explain how you can use the BaseJpaRepository from the Hypersistence Utils OSS project as an alternative to the default Spring Data JpaRepository. The reason why I’m not using the default JpaRepository on any of my Spring projects is that it provides some terrible defaults that can be very easily misused, like: The findAll Anti-Pattern The JPA save Anti-Pattern So, there are two ways you can fix the problems induced by the default JpaRepository: You can use the HibernateRepository to deprecate the questionable methods that you… Read More

The Spring Data JPA findById Anti-Pattern

Introduction In this article, we are going to see how the Spring Data JPA findById method can become an Anti-Pattern when using it to reference parent entity associations.

Spring Data JPA entity locking

Introduction In this article, we are going to see what options Spring Data JPA offers for entity locking. We will see how we can apply a shared or exclusive row-level lock upon fetching one or multiple entities.

How to write a custom Spring Data Base Repository

Introduction In this article, we are going to see how we can write a custom Spring Data base Repository that you could use instead of the default ones, like the overly common JpaRepository. Now, why would you even want to do that? Well, most of the default repositories extend the CrudRepository, which provides some very questionable defaults, like findAll or deleteAll that shouldn’t be really inherited by every single data access Repository instance.

The Spring Data findAll Anti-Pattern

Introduction In this article, we are going to see why inheriting the default Spring Data findAll method in every data access Repository is a terrible Anti-Pattern.

The best way to fetch a Spring Data JPA DTO Projection

Introduction In this article, I’m going to show you what is the best way to fetch a Spring Data JPA DTO Projection. Apart from the basic use cases, we’re going to see how to fetch even hierarchical DTO structures using Spring Data JPA.

The best Spring Data JpaRepository

Introduction In this article, I’m going to show you the best way to use the Spring Data JpaRepository, which, most often, is used the wrong way. The biggest issue with the default Spring Data JpaRepository is the fact that it extends the generic CrudRepository, which is not really compatible with the JPA specification.

The best way to write a Spring Data Exists Query

Introduction In this article, I’m going to show you the best way to write a Spring Data Exists Query that’s efficient from an SQL perspective. While doing consulting, I’ve encountered several options that are commonly used without developers knowing there are actually better alternatives.

The best way to write a custom Spring Data Repository

Introduction In this article, I’m going to show you the best way to write a custom Spring Data Repository. While the default JpaRepository methods, as well as the query methods, are very convenient in many situations, there might be times when you need custom Repository methods that can take advantage of any JPA provider-specific functionality.