We have a sessionless app that we have been running for years on Mac OS X on XServes. We recently moved it to Red Hat servers and now we are getting Out of Memory errors even though we have significantly increased the memory available. Red Hat is using the java sun jvm 1.6.0_20 64 bit, while the Mac servers were running java from Apple 1.5.0_24. I also tried on my Mac workstation using Apple java 1.6.0.22 64 bit and the memory appeared to be getting garbage collected without problem.
I configured the app to do a heap dump when the error occured (Additional arguments -XX:+HeapDumpOnOutOfMemoryError ) and used the Eclipse Memory Analyzer Tool (http://www.eclipse.org/mat) and it reported the following problem suspects: 1,296 instances of "java.lang.Thread", loaded by "<system class loader>" occupy 111,947,632 (43.21%) bytes. 1,292 instances of "er.extensions.eof.ERXEC", loaded by "java.net.URLClassLoader @ 0x2aaab375b7c0" occupy 37,478,352 (14.46%) bytes. 1,280 instances of "er.extensions.appserver.ERXRequest", loaded by "java.net.URLClassLoader @ 0x2aaab375b7c0" occupy 27,297,992 (10.54%) bytes. I am using WebObjects 5.4.3 and Wonder from February 2010. I think I have identified the page that causes the problem because I can reproduce the problem by continually hitting that page. It uses WOHTTPConnection to call an external web service (by sending a WORequest) and then includes the data received from the web service when it renders the page. Does anyone have any ideas? Tim
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