Thanks Mark , for your thoughts , will explore more and get back . On Mon, Oct 12, 2020 at 12:49 PM Mark Thomas <ma...@apache.org> wrote: > > On 11/10/2020 02:39, Prabhu Gurunathan wrote: > > Hi All, > > > > We have an setup where we are using OpenJDK 1.7 and Tomcat 7.0.100 , > > in CentOs 7 Env . and we have many application deployed in > > Tomcat/webapps and the common lib's needed for those apps are kept in > > Tomcat/lib directory like log4j , commons-fileupload ,xerces , Xalan > > .. etc > > > > The problem here is When we try to undeploy and deploy same > > applications multiple time we are getting into > > java.lang.OutOfMemoryError: PermGen space very quickly . Want to know > > is it very generic problem on this deployment model or is this can be > > fixed anyway ? > > The memory leak could be in any of: > - the application code > - a library the application depends on > - the JVM > - Tomcat > > In all cases, it should be possible to fix it. There might even be a > short-term workaround available. > > First of all, make sure that the JreMemoryLeakPreventionListener is > enabled in your configuration. > > Secondly, make sure that you don't get any warnings about possible > memory leaks in the logs when you reload an application. If you do, fix > the leaks identified. > > If you still see issues, the short version is: > - user a profiler > - reload each app in turn until you see more strong references to > org.apache.catalina.loader.[Parallel]WebappClassLoader instances in > memory than you have web applications > - find the one where started = false > - trace its GC roots > - that will tell you where the memory leak is > - how it was created might be harder to track down > > The long version is in a presentation linked from the Tomcat web site: > https://home.apache.org/~markt/presentations/2010-08-05-Memory-Leaks-JavaOne-60mins.pdf > > If you have any questions, you can ask here. > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org >
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