FULL PRODUCT VERSION :
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Verze 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
I have an application with some dialogues. After closing them all, the last dialogue stays in the memory. I have made a dump of live objects. Eclipse memory analyser shows, that the object was hold by sun.awt.windows.WInputMethod.lastFocussedComponentPeer reference.

I think this reference should be weak.

I have not tried it, but I guess the same problem is with JFrame.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Make a dialogue:
JDialog d;
d = new JDialog(...);
d.setVisible(true);
d.dispose();

Make a heap dump and analyse it.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The dialogue should be GC'ed.
ACTUAL -
The dialogue is in the heap.

REPRODUCIBILITY :
This bug can be reproduced always.