I have the following error occuring. I really like XWIKI but this memory issue is the only stumbling block. I would hate to have to move to daisycms or jspwiki. I have installed xwiki onto tomcat on Linux. Memory params are: -server -Xms512m -Xmx768m -Xss512k -XX:+UseParallelGC XWIKI config settings are out of the box ones. I did upload an excel spreadsheet attachment and then decided to delete it. I also tried to export to PDF, RTF etc. and left XWIKI running overnight and got this problem in the morning. 2009-07-15 08:20:24,351 [ http://localhost:8080/xwiki/bin/view/Sandbox/TableTraining?xpage=xpart&vm=co... ] [http-8080-Processor21] WARN web.XWikiAction - Uncaught exception: Error number 0 in 11: Uncaught exc eption Wrapped Exception: java.lang.O}}}utOfMemoryError: PermGen space 2009-07-15 08:23:14,716 [] [http-8080-Processor21] ERROR [/xwiki].[action] - Servlet.service() for servl et action threw exception java.lang.OutOfMemoryError: PermGen space 2009-07-15 08:58:03,385 WARN [service.services.export.ExportService] Backup directory /opt/tomcat/logs/backup does not exist Exception in thread "DefaultQuartzScheduler_QuartzSchedulerThread" java.lang.OutOfMemoryError: PermGen space 2009-07-15 10:50:24,583 [http://localhost:8080/xwiki/bin/view/Main/] [http-8080-Processor21] WARN web.XWikiAction - Uncaught exception: Error number 0 in 11: Uncaught exception Wrapped Exception: PermGen space 2009-07-15 10:50:48,298 [http://localhost:8080/xwiki/bin/view/Main/] [http-8080-Processor19] WARN web.XWikiAction - Uncaught exception: Error number 0 in 11: Uncaught exception Wrapped Exception: PermGen space 2009-07-15 10:51:59,029 [] [http-8080-Processor21] ERROR [/xwiki].[action] - Servlet.service() for servl et action threw exception java.lang.OutOfMemoryError: PermGen space 2009-07-15 10:52:36,721 [] [http-8080-Processor19] ERROR [/xwiki].[action] - Servlet.service() for servl et action threw exception java.lang.OutOfMemoryError: PermGen space java.lang.OutOfMemoryError: PermGen space Exception in thread "http-8080-Processor22" java.lang.OutOfMemoryError: PermGen space 2009-07-15 11:59:54,765 [http://localhost:8080/xwiki/bin/view/Sandbox/] [http-8080-Processor25] WARN web.XWikiAction - Uncaught exception: Error number 0 in 11: Uncaught exception Wrapped Exception: PermGen space 2009-07-15 11:59:59,377 [] [http-8080-Processor25] ERROR [/xwiki].[action] - Servlet.service() for servl et action threw exception java.lang.OutOfMemoryError: PermGen space Exception in thread "main" java.lang.OutOfMemoryError: PermGen space