CdiQueryInvocationContext#isNew isn't portable across jpa providers

We use PersisteceUnitUnitl for it, however - see the javadoc for it: http://docs.oracle.com/javaee/6/api/javax/persistence/PersistenceUnitUtil.html#getIdentifier%28java.lang.Object%29

Solution:
I guess the only portable check is EntityManager#contains and if it returns false a #load with the id >if< the id is available, the part with #contains just to be faster with entities which are really loaded by the em, well - instead of #load a count query would be better to avoid that it really loads the entity.