If the native structure associated with a Java object contains a GlobalRef
to that Java object then that reference will prevent collection of the
object when all external references go away. If the object was relying
on finalization to destroy the native data and delete the reference then
that object will never be collected.

This problem was preventing WGraphics objects from being collected and that
bug was fixed for 4095168, but the m_peerObject reference in the AwtObject
superclass of all of the peers typically also contains a GlobalRef that
could potentially prevent collection of the peer. Since peers tend to be
fairly meticulously garbage collected this doesn't happen very often, but
the fix should be applied to make the AWT more robust (see Suggested Fix).