when it happens, make a copy of thread stack dump and send the logs as well.
I was experiencing something very similar to this using 3.0.6 and Tomcat.
See: http://www.jboss.org/modules/bb/index.html?module=bb&op=viewtopic&t= have upgraded to 3.0.7 and it has not happend since.
I had attributed the error to an issue with Tomcat, but I could be wrong and the upgrade to 3.0.7 may have been what fixed it.
OK, Seema , can you try it with 3.0.7 and give feedback?
I changed my application to run under a different partition, instead of the default partition and I haven't seen that problem since.
I won't be able to test 3.0.7 immediately, but if I see this behaviour again, I will take a stack trace dump.
Thanks a lot for the help.