[jpa-spec users] Introduce javax.persistence.LazyLoadException

From: Harald Wellmann <>
Date: Sat, 21 Apr 2012 22:49:41 +0200

JPA 2.0 does not specify the behaviour of a persistence provider when
the application accesses an unloaded member of a detached entity.

In this case, Hibernate throws a LazyInitializationException, whereas
OpenJPA just leaves the member uninitialized which leads to a rather
non-descriptive NullPointerException.

It would help JPA users to write portable code if there were a standard
exception for this standard scenario.

Proposal for JPA 2.1:

The persistence provider MUST throw a
javax.persistence.LazyLoadException (derived from
javax.persistence.PersistenceException) when the application accesses a
member of a detached entity for which PersistenceUtil.isLoaded() returns

Best regards,