Here is the steps to reproduce this issue:
open browser to view localhost:4848
click somewhere, e. g. server-config
click somewhere else WHILE THE RESTART IS IN PROGRESS STILL
browser will wait until the restart is done and then show a nice glassfish-provided page telling that this JSF is not found
Here is the environment:
That machine is a HP Z400 QuadXeon with Win7 Pro SP1 64 Bit de_DE running a Firefox 3.6.18.
mkarg even took the time to capture the video on how to reproduce this. The video is attached in
GLASSFISH-16958, and can be downloaded from http://java.net/jira/secure/attachment/46737/HowToCrashAdminGUI.wmv
requested mkarg to attach server.log when this problem occurs.