If the entity becomes detached and you changed it, you have to propagate the changes back to the database, in which case you can use either merge or update. If you create a new entity, you have to call persist so that the entity becomes managed, and the flush will generate the INSERT statement. In fact, starting with Hibernate 6, the save and saveOrUpdate methods are now deprecated and will be removed in a future version as they are just a mistake that got carried away from Hibernate 1. While there are two methods called save and saveOrUpdate in the Hibernate Session, as I explained in this article, they are just an alias for update. Now, Hibernate was created before JPA, hence besides implementing the JPA specification, it also provides its own specific methods, such as the update one. JPA is basically an entity state machine, as illustrated by the following diagram:Īs you can clearly see, there’s no save method in JPA. There’s no such thing as a save method in JPA because JPA implements the ORM paradigm, not the Active Record pattern. 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. 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. So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night! Well, Hypersistence Optimizer is that tool!Īnd it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework. Import having a tool that can automatically detect JPA and Hibernate performance issues. The following code shows the use of ApplicationContextAware. void setApplicationContext(ApplicationContext applicationContext) This interface provides a single setApplicationContext method. Spring provides an ApplicationContextAware interface that allows beans access to the ApplicationContext. Similarly, if your bean needs access to some application file resource in your bean or even publish some application events, you need access to the ApplicationContext. For example, if your bean needs to look up some other beans. In Spring beans, you might require access to the ApplicationContext. In the bean lifecycle, the Spring Framework calls the aware interface methods after populating bean properties and just before pre initialization with BeanPostProcessor. In this post, we will learn about the Spring aware interfaces, particularly ApplicationContextAware, BeanFactoryAware, and BeanNameAware interfaces. For example, if the bean implements the ApplicationContextAware interface, Spring will inject an ApplicationContext object in to the bean. The object Spring injects depends on the interface which the bean implements. When a bean implements an Aware interface, the Spring Framework injects a particular framework object to the bean through a callback-style method. To gain access, a bean can implement one of the many Aware interfaces of the Spring Framework. Your Spring beans might require access to framework objects, such as ApplicationContext, BeanFactory, and ResourceLoader. Though Spring Aware interfaces, you can access the Spring context, or Spring Bean life cycle events. Spring Aware Interfaces allow you to hook into the inner workings of the Spring Framework.
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