jackson - do not serialize lazy objects

Question

I have an entity:

@Entity
public class Book {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column
    private Stri         


        

Answer 1

Maybe this is related to a known issue about lazy loading.

I don't use jackson-datatype-hibernate, but what I've done to solve the same problem is to get the persistent collection out of the picture by using a DTO instead of serializing a Hibernate object directly. Tools like Dozer can help you out with that. Alternatively, there's a small utility I wrote to do mappings like this.

If you just want to experiment with what a DTO could look like, you can replace the unloaded persistent collection with a regular empty collection, like books.setGenre(new ArrayList<>()); Unfortunately I don't know of a way to tell if a lazily loaded object has been loaded or not, so you can't do this reassignment automatically. The places where you replace persistent collections would need to be determined by you on a case by case basis.