I found a solution to this problem. It was posted here...
http://forums.sun.com/thread.jspa?messageID=10397605
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I've been getting the following error from time to time. It occurs somewhat
randomly, but tends to happen more often during login. Once one user
encounters this error at login, all other users encounter the error at login
and the site becomes inaccessible. It's difficult to tell from the stac