Thanks Manuel Dominguez On Mon, Oct 12, 2020 at 5:51 PM Manuel Dominguez Sarmiento <m...@renxo.com> wrote: > > The articles in this page will be helpful: > https://java.jiderhamn.se/category/classloader-leaks/ > > On 12/10/2020 04:19, Mark Thomas 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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