[ 
http://jira.jboss.com/jira/browse/JBAS-1319?page=comments#action_12316802 ]
     
Adrian Brock commented on JBAS-1319:
------------------------------------

Correct, this is caused by something holding onto classloaders across 
deployments. 
Usually because of static collections in non redeployed classes.

Which version did you test? 
Here is a bug fix for Tomcat 5.0.28 (used in JBoss4.0.1) and ThreadAttributes
where just such a static Hashtable was causing a memory leak.
The fix was to replace the static Hashtable with a ThreadLocal.

http://issues.apache.org/bugzilla/show_bug.cgi?id=33368
http://cvs.apache.org/viewcvs.cgi/jakarta-tomcat-connectors/util/java/org/apache/tomcat/util/log/SystemLogHandler.java?r1=1.5&r2=1.6

JBoss4.0.2RC1+ uses Tomcat5.5 which includes this fix.

> redeploy causes OutOfMemoryError
> --------------------------------
>
>          Key: JBAS-1319
>          URL: http://jira.jboss.com/jira/browse/JBAS-1319
>      Project: JBoss Application Server
>         Type: Bug
>   Components: Web (Tomcat) service
>     Versions: JBossAS-4.0.1 Final
>  Environment: JBoss 4.0.1 running on fedora core 3, using jdk 1.5.0
>     Reporter: Matthew Todd
>     Assignee: Clebert Suconic
>  Attachments: analysis.zip
>
>
> Constant redployment, even of a simple web application eventually causes an 
> OutOfMemoryError in JBoss. 
> To duplicate, keep on copying a .war package into a servers hot deploy 
> directory. Eventually an OutOfMemoryError occurs. 
> This is especially dangerous when running as a cluster, as when the node is 
> restarted, it is unable to join the cluster again.

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