public boolean isOpen (); public void close ();
When an EntityManager
is no longer
needed, you should call its close
method.
Closing an EntityManager
releases any resources
it is using. The persistence context ends, and the entities managed by
the EntityManager
become detached.
Any Query
instances the EntityManager
created become invalid.
Calling any method other than isOpen
on a
closed EntityManager
results in an
IllegalStateException
. You cannot close an
EntityManager
that is in the middle of a
transaction.
If you are in a managed environment using injected entity managers, you should not close them.