[jboss-jira] [JBoss JIRA] Created: (JBAS-5270) ClassLoader not unloaded on undeploy

Mon Mar 3 08:25:57 EST 2008

ClassLoader not unloaded on undeploy
------------------------------------

                 Key: JBAS-5270
                 URL: http://jira.jboss.com/jira/browse/JBAS-5270
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: ClassLoading
    Affects Versions: JBossAS-4.2.1.GA
         Environment: JDK 1.6.0_04 amd64
            Reporter: Arto Huusko
         Assigned To: Scott M Stark

When an EAR is undeployed, its ClassLoader and classes loaded by it are not unloaded, which leads to out of memory error in permanent generation on redeploy.

It appears that the ClassLoader becomes an orphaned ClassLoader (see http://blogs.sun.com/edwardchou/entry/find_orphaned_classloaders), and apparently JVM is unable to GC such ClassLoader instances (if it were, I don't understand the point of the blog about orphaned loaders).

My simple test ear contains one stateless session EJB (2.1), with a simple "echo" method (takes string, returns string). Jhat shows that the only reference to the ClassLoader instance comes from static field m3 in class $ProxyNN, where $ProxyNN is loaded by the same ClassLoader (in case it makes any difference, m3 points to the create method of the local home interface of the session).

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira