8.9. Closing

public boolean isClosed ();
public void close ();

When a PersistenceManager is no longer needed, you should call its close method. Closing a PersistenceManager releases any resources it is using. The persistent instances managed by the PersistenceManager become invalid, as do any Query and Extent objects it created. Calling any method other than isClosed on a closed PersistenceManager results in a JDOUserException.