What are the main differences between Hibernate and Spring Data JPA? Sadly, works for primary DS only :( So, if you have more than one DataSources, remember - transactions works just for primary one :) That's why any refactoring makes big crash. Unfortunately, SpringJPA is based on reflections, and sometimes you need to point a method name or entity package into annotations (!). Why own transaction management is an disadvantage? Since Java 1.8 allows default methods into interfaces, Spring annotation based transactions, simple doesn't work. no datasource pooling (HikariCP must be in use as third party library).huge problems with more than one datasources configuration.own transaction management (hibernate transactions disallowed).no EntityManager access in classes (this is basic JPA class!).If you want to do something more than findById() or save, you must go through hell: Yes, it provides some classes and you can make some simple DAO fast, but in fact, it's all you can do. You don't need to write dao implementation anymore.Thats how spring data jpa makes your life easy. Now Spring data jpa allow us to define dao interfaces by extending its repositories(crudrepository, jparepository) so it provide you dao implementation at runtime. So there is lot of boilerplate code we can see here. Let say you are writing dao class for Employee class, tomorrow in your application you might need to write similiar crud operation for any other entity. Now you need to have dao interface and implementation where you will be writing crud operation using SessionFactory of hibernate. Let's say you are using spring + hibernate for your application. So lets understand how spring data jpa and spring + hibernate works. Spring Data JPA : This is another layer on top of jpa which spring provide to make your life easy.But if using jpa with spring it allows you to switch to different providers in future. Hibernate: There are various provider which implement jpa.JPA : Java persistence api which provide specification for persisting, reading, managing data from your java object to relations in database.There are 3 different things we are using here :
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