[jboss-jira] [JBoss JIRA] Created: (JGRP-752) JGroups leaks thread context classloader to internal threads

Tue May 6 15:59:20 EDT 2008

JGroups leaks thread context classloader to internal threads
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                 Key: JGRP-752
                 URL: http://jira.jboss.com/jira/browse/JGRP-752
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.6.2
            Reporter: Brian Stansberry
         Assigned To: Bela Ban
         Attachments: classloader-leak.patch

Follow-up to discussion on the jgroups-dev list of issue where threads created by JGroups, particularly pool threads, inherit their TCCL from whatever thread triggers their creation.  This can leak application classloaders in an environment where different applications share JGroups resources.

Attached is a patch for this, against the 2.6 branch.  We can use this to discuss whether this is worth fixing in JGroups.  I have a fix in JBoss AS, although I'm concerned it could prove fragile over time.

The patch is pretty simple, except for TCLAction, an abstraction used to deal with the presence or absence of a SecurityManager.  I also tried to handle a J2ME case where SecurityManager, or even the ClassLoader class, don't exist. Not sure if that will work, just an effort.

Patch includes a unit test based on the one in JBoss AS. Hasn't really been properly adapted to all the stuff going on in the JGroups test environment, but it works.

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