One thing that can help is to increase the PermGen space memory allocation in the JVM startup. To do this, add the following flag to the Tomcat JAVA_OPTS:
-XX:MaxPermSize=256m (or another suitable value for you.) Note however, that this is a workaround and does not solve the core issue of a leak in the PermGen space. But we use it to enable more webapp deployments before a server restart is needed, so it might be part of a solution for you. Chris -----Original Message----- From: Scott Mueller [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 19, 2008 11:32 AM To: Tomcat Users List Subject: Re: Running out of memory too easily in Tomcat 6.0.16 Thank you for the response Chuck. Like I said, this is a very simple webapp (aside from the Spring/Hibernate libraries). Stores nothing ever in any sessions and I can't imagine memory leaks with the simple code. Thank you for those links, I guess I should run a profiler to see exactly what's going on. In the meantime, what's the proper way to increase the memory allocated to tomcat? And should I allocate more than my physical ram? Is there a general formula for how much ram to allocate to tomcat on a machine dedicated to only that function? On Wed, Mar 19, 2008 at 11:03 AM, Caldarale, Charles R < [EMAIL PROTECTED]> wrote: > > From: Scott Mueller [mailto:[EMAIL PROTECTED] > > Subject: Running out of memory too easily in Tomcat 6.0.16 > > > > I have a very small and simple Spring + Hibernate application > > Once you throw Spring and Hibernate into the mix, nothing is simple. > > > javax.servlet.ServletException: java.lang.OutOfMemoryError: > > PermGen space > > Somewhere, you're hanging onto references to objects or classes from the > prior deployments. ThreadLocal usage is a typical way of doing this, as > are inappropriate references stored in a Session, but there's no limit > to programmer's inventiveness in creating memory leaks. > > Read the FAQ: > http://wiki.apache.org/tomcat/FAQ/Memory > > Especially this link from there: > http://opensource.atlassian.com/confluence/spring/pages/viewpage.action? > pageId=2669<http://opensource.atlassian.com/confluence/spring/pages/view page.action?pageId=2669> > > - Chuck > > > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY > MATERIAL and is thus for use only by the intended recipient. If you > received this in error, please contact the sender and delete the e-mail > and its attachments from all computers. > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
