How to force eager loading with CrudRepository in spring-data?

Question

I have an entity containing a List that is thus lazy loaded by default:

interface MyEntityRepository extends CrudRepository

        

Answer 1

I needed this too and as I'm calling the dao inside a service object that is insise a transaction I call call the get method so no exception and I was able to fetch the records. Something like in java 8:

public ProductEntity findProduct(int id) {
    ProductEntity p = productRepository.findOne(id);
    p.getPresentations().stream().count();
    return p;
}

p.getPresentations().stream().count(); will force the fetch, I know is not a clean way to do it but it gets the job done in the mean time

Answer 2

Change your mapping from

@OneToMany(mappedBy = "bar") //lazy by default

To

@OneToMany(mappedBy = "bar", fetch = FetchType.EAGER) //lazy by default

Answer 3

findAllById() uses eager fetch, no customization is needed.

  interface MyEntityRepository extends CrudRepository<MyEntity, Long> {        
    Optional<MyEntity> findAllById(long id);
}

Answer 4

You can force eager fetch writing custom HQL query with left join fetch, eg:

interface MyEntityRepository extends CrudRepository<MyEntity, Long> {
    @Query("select e from MyEntity e left join fetch e.bar b where e.id = ?1")
    MyEntity findOne(long id)
}