Question

I need a helper to know whether a property has been loaded as a way to avoid LazyInitializationException. Is it possible?

@Entity
public class Parent {
    @OneToMany
    private List<Child> childList;
}

@Entity
public class Child {

}

"select distinct p from Parent p left join fetch p.childList";

// Answer goes here
// I want to avoid LazyInitializationException
SomeHelper.isLoaded(p.getChildList());

Answer 1

There are two methods, actually.

To find out whether a lazy property has been initialized you can invoke Hibernate.isPropertyInitialized() method with your entity instance and property name as parameters.

To find out whether a lazy collection (or entity) has been initialized (like in your example) you can invoke Hibernate.isInitialized() with collection (entity) instance as parameter.