Opening repeatedly the same java file in editor
and closing it shows cummulating instances of
objects from org.openide.src.*, e.g.
o.o.src.MethodParameter, o.o.src.Type,
o.o.src.Identifier.

You can see on the attached screenshots of
OptimizeIt window that instances of
MethodParameter were allocated by a bean module's
thread and that the instances are kept in memory
in bridge's array and this reference path goes to
o.n.mdr.util.EventNotifier$Instance's
RegisteredListenerSets.