What does Forms-DialogThread? WebForms / JRE randomly freezing

Anyone who can explain, what the thread "Forms-DialogThread" is handling/doing. Is it displaying a popup/alert or a canvas?
I'm trying to debug randomly freezing in Oracle WebForms runing JRE 1.6 update 12, 13 or 14. See this post for more information:
Forms Hang when trying to open
I've found the following information through JConsole, where I can see that AWT-windows's state is blocked and waiting for Forms-DialogThread.
JCONSOLE
Name: AWT-Windows
State: BLOCKED on java.util.LinkedList@1367dca owned by: Forms-DialogThread56
Total blocked: 54 Total waited: 0
Stack trace:
java.awt.KeyboardFocusManager.shouldNativelyFocusHeavyweight(Unknown Source)
sun.awt.windows.WToolkit.eventLoop(Native Method)
sun.awt.windows.WToolkit.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
Name: Forms-DialogThread56
State: RUNNABLE
Total blocked: 0 Total waited: 0
Stack trace:
sun.awt.KeyboardFocusManagerPeerImpl.getNativeFocusOwner(Native Method)
sun.awt.KeyboardFocusManagerPeerImpl.getCurrentFocusOwner(Unknown Source)
java.awt.KeyboardFocusManager.getNativeFocusOwner(Unknown Source)
java.awt.KeyboardFocusManager.processSynchronousLightweightTransfer(Unknown Source)
- locked java.util.LinkedList@1367dca
sun.awt.windows.WComponentPeer.processSynchronousLightweightTransfer(Native Method)
sun.awt.windows.WComponentPeer.requestFocus(Unknown Source)
java.awt.Component.requestFocusHelper(Unknown Source)
java.awt.Component.requestFocusHelper(Unknown Source)
java.awt.Component.requestFocus(Unknown Source)
oracle.ewt.lwAWT.AbstractButton.requestFocus(Unknown Source)
oracle.ewt.lwAWT.lwWindow.LWWindow._restoreFocus(Unknown Source)
oracle.ewt.lwAWT.lwWindow.LWWindow.setActive(Unknown Source)
oracle.ewt.lwAWT.lwWindow.LWWindow.setVisible(Unknown Source)
oracle.ewt.lwAWT.lwWindow.LWWindow.setVisible(Unknown Source)
oracle.forms.handler.DialogThread.doUserAlert(Unknown Source)
oracle.forms.handler.DialogThread.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
Edited by: Lerche on Jul 20, 2009 10:07 AM
Edited by: Lerche on Jul 20, 2009 10:17 AM

Welcome to the forum!
Does the new RAM pass memtest 86?
Cheers,
George
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