There appears to be an issue with context synchronization in 1.8.2 P06. The exception has no functional impact and is not easily reproduced. Here is the exception:

2013-04-29 09:40:44,866 Session Monitor ERROR com.xxx.as.service.log4j.impl.Log4jConfigurator$UncaughtExceptionHandler.uncaughtException(Log4jConfigurator.java:253) - Detected uncaught exception in thread: Session Monitor

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
at java.util.HashMap$KeyIterator.next(HashMap.java:845)
at com.icesoft.faces.webapp.http.servlet.SessionDispatcher$Monitor.shutdown(SessionDispatcher.java:440)
at com.icesoft.faces.webapp.http.servlet.SessionDispatcher$Monitor.shutdownIfExpired(SessionDispatcher.java:453)
at com.icesoft.faces.webapp.http.servlet.SessionDispatcher$Listener$1.run(SessionDispatcher.java:326)

2013-04-29 09:40:44,866 Session Monitor DEBUG com.xxx.messaging.bmc.oamp.SessionCleaner.sessionDestroyed(SessionCleaner.java:38) - sessionDestroyed ac162d775700-2293736884-1-2066-1-3520-1025511666: Mon Apr 29 09:40:44 CEST 2013