7 Replies Latest reply on Jun 3, 2010 2:11 AM by prabhat singh

    Increase in memory over the period of time

    prabhat singh Newbie

      Hello All,

       

      i'm running JBoss server for quite a long time (14 days)

       

      there is memroy increemnt by org.jboss.system.server.NoAnnotationURLClassLoader loading to load class org.jboss.mx.server.MBeanServerImpl.

      its increasing continiously.

      there could be reason that the classloader is still keeping referance with it normally refered as (Orphend class loaders).

      anyone can suggest what need to be done to resolve this issue.

        • 1. Re: Increase in memory over the period of time
          Marc Ende Newbie

          Hi,

           

          you should choose a very good profiler, which can do longtime observation of servers.

          Then you'll should trace it. I don't think that the jboss as has this issue. We're running

          several jboss-instances which are running much longer than 14 days. On the other hand

          a memory leak is a difficult point which is often hard to find. And, of course, often, but not

          everytime, the leaks are found in the personal code. So it's really hard to find a solution for

          such leaks in a forum. 

           

          m.

          • 2. Re: Increase in memory over the period of time
            prabhat singh Newbie

            I am thankful to you for your reply.

             

            i already use Eclipse Memory analyser  for the heap analysis and found that MBeanServerImpl  Objects are getting loaded and getting accumalated.

            i also read about Orphen Class loaders.

            still not clear how to make them clean.

             

            i already have attached image shown in Eclipse memory A.

            • 3. Re: Increase in memory over the period of time
              Marc Ende Newbie

              Hi,

               

              just having this information doesn't help much. But I would say you should have a look at your own code.

              I think this happens after a deployment of your application. So if it's an application you sholud look

              for what is happening within the classloader of the application. When it's an mbean you should have

              a look for the classes loaded there.

               

              Profiling and finding memory-leaks isn't such an easy thing. May be you should also try another profiler than the

              Eclipse TPTP. Some of them have some more specialized features, which may help finding your leakage.

               

              Marc

              • 4. Re: Increase in memory over the period of time
                prabhat singh Newbie

                Thanks Marc,

                i also checked with YourKit profililer i could only see that there are EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock instances gettign acumalated in memory. JMSManagedConnection is holding this. is there any way to cleanup this.

                 

                apart from this i can see many instances of org.hibernate.hql.ast.util.JoinProcessor, i'm not sure if its normal if not how to clean them up.

                please comment.

                 

                BR

                 

                prabhat.

                • 5. Re: Increase in memory over the period of time
                  Marc Ende Newbie

                  hi prabath,

                   

                  the org.hibernate.hql.ast.util.JoinProcessor is part of hibernate as it says the name. If you're using hibernate (directly or indirectly) these come up if you've got join's which I would expect. If you don't work in the depth of hibernate internals you should have no troubles with them.

                  If they still increase and aren't cleaned up you'll should check your application code and configuration.

                   

                  The other one is part of the JBoss internals, which you can use of course, if you don't they may be an indicator for an issue but personally I think that they're related to the normal usage of jboss.

                   

                  At first I'd like to repeat: "If you find a hoof print in europe you would say that's one of a horse and not one of a zebra." What I mean: The memory issue is mostly an issue of added deployments or configurations. It's mostly not an issue of the applicationserver itself.

                   

                  To help you I need definately some more information:

                  a) What are you deploying (mbeans, beans, entities, war's,...)?

                  b) Do you spawn threads?

                  c) Do you make use of jms?

                  d) Any other specialities?

                  e) Any proprietary libraries?

                   

                  Due to the fact that your application uses more and more memory over 14 days make me believe that you've got something which will

                  be called regular and doesn't release the objects. Do you have custom mbeans? What about your sessionbeans? Do the stateless have any class-level fields? What about the stateful? Are there any Lists which are filled and not released (such as class-level fields)?

                   

                   

                  Marc

                  • 6. Re: Increase in memory over the period of time
                    prabhat singh Newbie

                    Hello Marck,

                     

                    We have all kind of stuff you mentioned.

                     

                    a) EJBs

                    b) Stateless Session Beans.

                    c)  we do NOT have Stateful session bean.

                    d) Extensive use of JMS as a eventing system. (every client creates a connection and wait for messages which are publised 5 msg/sec or more).

                     

                    as per your questions.

                     

                    a) What are you deploying (mbeans, beans, entities, war's,...)?    Yes.

                    b) Do you spawn threads?         NO

                    c) Do you make use of jms?     Extensive

                    d) Any other specialities?         live server and has live connected clients (RMI and SOAP)

                    e) Any proprietary libraries?       NA

                     

                    BR

                    • 7. Re: Increase in memory over the period of time
                      prabhat singh Newbie

                      somehow we got the issue with our own way of using some native library. so is is fixed.

                       

                      thanks a lot.