User development, A new message was posted in the thread "Memory consumption 1h after JBoss start": http://community.jboss.org/message/521840#521840 Author : Peter Johnson Profile : http://community.jboss.org/people/peterj Message: -------------------------------------------------------------- It almost looks like a new app is being deployed at that time. That would explain the huge jump in the number of Zip* instances. Is there anything in the log that might shed light on what is going on?   Also, add the "-verbose:class" JVM option to JAVA_OPTS in the run script. This option causes the JVM to print to stdout every class laoded and the JAR from which it came. It would be interesting to see what the output is when the spike happens. Of course, redirect stdout/stderr to a file - you will get a ton of output. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/521840#521840