ICEfaces
  1. ICEfaces
  2. ICE-1613

Redeploying ICEfaces applications leaks Perm gen

          Details

          • Type: Bug Bug
          • Status: Closed
          • Priority: Major Major
          • Resolution: Fixed
          • Affects Version/s: 1.6DR#4
          • Fix Version/s: 1.6DR#5, 1.6
          • Component/s: None
          • Labels:
            None
          • Environment:
            ICEfaces

            Description

            When certain ICEfaces applications are repeatedly redeployed, the following Error will be displayed, requiring an application server restart:

            java.lang.OutOfMemoryError: PermGen space

            For instance, the following script can monitor this and reproduce the problem:

             while true; sleep 5; do curl -o /tmp/auction.html http://localhost:8080/auctionMonitor/; cp samples/auctionMonitor/dist/auctionMonitor.war /tmp/apache-tomcat-5.5.20/webapps/; /usr/local/jdk1.6.0_01/bin/jmap -J-Xmx512m 17824; done

              Activity

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              Ted Goddard added a comment -

              Application-level fix seems to resolve the issue. Commented out the offending code rather than removing it to serve as a warning.

              Testing with component-showcase (fetching only the initial page, not testing using a full browser) shows no redeployment memory leak.

              So, it seems that this leak was specific to auctionMonitor.

              Show
              Ted Goddard added a comment - Application-level fix seems to resolve the issue. Commented out the offending code rather than removing it to serve as a warning. Testing with component-showcase (fetching only the initial page, not testing using a full browser) shows no redeployment memory leak. So, it seems that this leak was specific to auctionMonitor.
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              Ted Goddard added a comment -

              Information on the technique used to debug the leak:

              jmap -dump:format=b,file=leak 29142
              jhat -J-Xmx512m leak

              Show
              Ted Goddard added a comment - Information on the technique used to debug the leak: jmap -dump:format=b,file=leak 29142 jhat -J-Xmx512m leak
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              Ted Goddard added a comment -

              This appears mainly to be an application bug. On startup, auctionMonitor creates a java.util.Timer and an associated Thread

              new Timer().scheduleAtFixedRate(new TimerTask() { ...

              The ContextClassLoader of this Thread is the webapp classloader and keeps the ICEfaces classes locked in PermGen.

              Since auctionMonitor is now essentially resetting itself correctly and does not allow excessively large bids, the best approach is likely to disable the timed reset functionality.

              Show
              Ted Goddard added a comment - This appears mainly to be an application bug. On startup, auctionMonitor creates a java.util.Timer and an associated Thread new Timer().scheduleAtFixedRate(new TimerTask() { ... The ContextClassLoader of this Thread is the webapp classloader and keeps the ICEfaces classes locked in PermGen. Since auctionMonitor is now essentially resetting itself correctly and does not allow excessively large bids, the best approach is likely to disable the timed reset functionality.
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              Ted Goddard added a comment -

              I've been looking at the following reference to help understand this bug:

              How to fix the dreaded "java.lang.OutOfMemoryError: PermGen space" exception (classloader leaks)

              http://blogs.sun.com/fkieviet/entry/how_to_fix_the_dreaded

              The leak appears to be a ClassLoader leak held by Thread ContextClassLoader and InheritableThreadLocal (the PersistentFacesState).

              Show
              Ted Goddard added a comment - I've been looking at the following reference to help understand this bug: How to fix the dreaded "java.lang.OutOfMemoryError: PermGen space" exception (classloader leaks) http://blogs.sun.com/fkieviet/entry/how_to_fix_the_dreaded The leak appears to be a ClassLoader leak held by Thread ContextClassLoader and InheritableThreadLocal (the PersistentFacesState).
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              Greg Dick added a comment -

              This seems to be a known issue with classloaders not releasing class definitions after redeployment.
              http://forum.hibernate.org/viewtopic.php?t=960856&highlight=leaks

              Show
              Greg Dick added a comment - This seems to be a known issue with classloaders not releasing class definitions after redeployment. http://forum.hibernate.org/viewtopic.php?t=960856&highlight=leaks

                People

                • Assignee:
                  Unassigned
                  Reporter:
                  Ted Goddard
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                  Dates

                  • Created:
                    Updated:
                    Resolved: