How to test whether lazy loaded JPA collection is initialized?

Question

I have a service that gets a JPA entity from outside code. In this service I would like to iterate over a lazily loaded collection that is an attribute of this entity to see

Answer 1

org.hibernate.Hibernate.isInitialized(..)

There is no standard JPA solution to my knowledge. But if you want to actually initialize collections, you can create an utility method and iterate them (only one iteration is enough).