7/28/2023 0 Comments Hibernate annotations in detailLazyToOneOption.NO_PROXY Hibernate annotation The Hibernate annotation is redundant if the association uses the FetchType.LAZY strategy. This is the default behavior for FetchType.LAZY associations, so we get the same outcome even if we omit the annotation. Post entity class: Post$HibernateProxy$QrlX9iOq We can see that a single SQL query is executed this time:Īnd the class of the Post entity reference is HibernateProxy: PostDetails details = doInJPA(entityManager -> ", details.getPost().getClass()) If we want to fetch the PostDetails entity: setTitle("High-Performance Java Persistence, 1st Part") If we add the following Post and PostDetails entities: However, we also have the annotation set on the post association. Notice that the fetch attribute of the annotation is set to FetchType.LAZY. Private Date createdOn = new = "created_by") Public class PostDetails Long = "created_on") Getters and setters omitted for brevityĪnd the following client PostDetails entity that defines a one-to-one association using to share the identifier with its parent Post = "post_details") So, considering we have the following parent Post = "post") If you are using the LazyToOneOption.FALSE, an association will be fetched eagerly even if it’s using the FetchType.LAZY fetch strategy. LazyToOneOption.FALSE Hibernate annotation Next, we will see how all these three options work with JPA and Hibernate. The value attribute takes a LazyToOneOption enumeration, which provides one of the following three values: The Hibernate annotation looks as follows: The Hibernate LazyToOne annotation and the LazyToOneOption enumeration Since Hibernate 5.5, you no longer need to use LazyToOneOption.NO_PROXY with bytecode enhancement. In this article, I’m going to explain how the Hibernate LazyToOne annotation works and why you should use NO_PROXY lazy loading with bytecode enhancement.īefore Hibernate 5.5, without the LazyToOneOption.NO_PROXY annotation, the parent-side of a association is always going to be fetched eagerly even if you set it to FetchType.LAZY and enabled bytecode enhancement lazy loading. 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. Follow having a tool that can automatically detect JPA and Hibernate performance issues.
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