how to unproxy a hibernate object [duplicate]

Question

How can I unproxy a hibernate object, such that polymorphism would be supported?

Consider the following example. Classes A and B are two hibernate entities. B has two subtypes C and D.

List<A> resultSet = executeSomeHibernateQuery();
for(A nextA : resultSet) {
    for(B nextB : nextA.getBAssociations() {
        if(nextB instanceof C) {
            // do something for C
        } else if (nextB instanceof D) {
            // do something for D
        }
    }
}

This code fails to execute either the C or D block, since the B collection has been lazy loaded, and all instances of B are Hibernate proxies. I'd like a way to unproxy each instance.

Note: I realize the query can be optimized to eagerly fetch all B's. I'm looking for an alternative.

Answer 1

Here's our solution, added to our persistence utils:

public T unproxy(T proxied)
{
    T entity = proxied;
    if (entity instanceof HibernateProxy) {
        Hibernate.initialize(entity);
        entity = (T) ((HibernateProxy) entity)
                  .getHibernateLazyInitializer()
                  .getImplementation();
    }
    return entity;
}

Answer 2

Nowadays Hibernate has dedicated method for that: org.hibernate.Hibernate#unproxy(java.lang.Object)