For me the problem happened during the day and was reasonably associated with an increase in activity.
By the way, I'm using glassfish v1 build b02-p01 (SJSAS 9.0_01) at the moment, although I expect to move to glassfish v2 after the final is released.
About the morning hours - is there associated activity in the Glassfish access logs or Apache access logs? Is Apache httpd on the same box or is there a firewall between Apache and Glassfish? Do you have access to Apache's mod_jk.log if we need to look there?
I guess the first thing I'm looking for is if there is an avalanche of requests coming in at that time.
-Paul
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