See here for some background: https://hibernate.atlassian.net/browse/HHH-10968

When the JPA translator encounters a de-typed entity, such as those synthesized by Hibernate Envers, a NullPointerException is thrown. This is because the entity getJavaType() returns null, and calling getName() on that goes boom.

The simplest solution I can think of is to wrap the Metamodel in another one which filters out any entities/managed types which return null for getJavaType(), but if something more useful could be done with these things that would be nice.