LazyInitializationException 使用 hibernate 增强 @Basic(fetch = FetchType.LAZY)

Question

I have this persistent entity with a lob field that gets eagerly fetched so I configured the hibernate-enhance-maven-plugin and made it lazy:

@Lob
@Column(name = "MY_FIELD")
@Basic(fetch = FetchType.LAZY)
private byte[] lazyField;

Now I am getting LazyInitializationException at a fairly simple test:

myJpaRepo.findAll().get(0).getLazyField()

Unable to perform requested lazy initialization [MyEntity.lazyField] - no session and settings disallow loading outside the Session

I use Spring Boot and have not done anything specific to configure hibernate. This test uses a h2 database.

MyRepo is annotated with @Transactional.

If I also annotate the executing method, there is no Exception thrown:

@Transactional
public void test(){
    myJpaRepo.findAll().get(0).getLazyField()
}

Will I need to annotate as transactional every single time someone tries to fetch the lazy field, or is there something else I can do to avoid that?

Answer 1

Error says that you are trying to access association outside of hibernate session/transaction boundary.

In this case you will have to annotate test method with @transaction as well so that you are well within transaction boundary and have active hibernate session.