Tested jdk 7b147 on ubuntu 10.04.
The general bug is that we repaint native part of the XComponentPeer after UPDATE event.
Small testcase attached. If you see the cross in the window the test passed otherwise failed.
Note that test works on MToolkit and WToolkit.
The same bug was fixed on macosx:7125657.
Because of this issue our incremental paint functionality does not work.