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From "Jerome Waibel (JIRA)" <>
Subject [jira] Commented: (CXF-2286) CXF locking jars in Tomcat when undeployed preventing hot deployment / eating up permgen
Date Mon, 15 Jun 2009 20:38:07 GMT


Jerome Waibel commented on CXF-2286:

I did some further research on this:

* This problem is not related to tomcat, it happens also on jetty.
* I did some inspection with Yourkit. After undeploying it shows several instances of cxf
objects that are still alive. I attached a screenshot of the output. Maybe this can give someone
some idea  what is going on here.

> CXF locking jars in Tomcat when undeployed preventing hot deployment / eating up permgen
> ----------------------------------------------------------------------------------------
>                 Key: CXF-2286
>                 URL:
>             Project: CXF
>          Issue Type: Bug
>    Affects Versions: 2.2.2
>         Environment: Tomcat 6, Java 1.6, Windows+Linux
>            Reporter: Jerome Waibel
>         Attachments: ObjectAlive.png
> Create a simple webapp with the following in web.xml:
> 	<servlet>
> 		<display-name>CXF Servlet</display-name>
> 		<servlet-name>CXFServlet</servlet-name>
> 		<servlet-class>
> 			org.apache.cxf.transport.servlet.CXFServlet
> 		</servlet-class>
> 		<load-on-startup>1</load-on-startup>
> 	</servlet>
> 	<servlet-mapping>
> 		<servlet-name>CXFServlet</servlet-name>
> 		<url-pattern>/*</url-pattern>
> 	</servlet-mapping>
> No fancy code, no real web services, just plain starting of the servlet. Create a war
and deploy it into a tomcat. Enjoy the startup of the servlet. Press "undeploy" in the tomcat
application manager.
> Under windows you will notice that most of the cxf jars are *not* deleted in the webapps
directory, the application isn't completly undeployed. Tomcat seems to lock the jars preventing
them from beeing deleted. Subsequent re-deployment of the webapp will fail because of the
left-over jars. Hot re-deployment of the webapp is impossible.
> Under linux the webapp directory is gone, but this is because linux' ext filesystem allow
files beeing deleted that are still held open by an applicaton. When checking with the lsof
tool you will see that under linux tomcat still has references to the old jar. Hot re-deployment
is possible here, but you will soon run out of permgen memory because the old classes are
not unloaded.
> It seems the servlet is still locking some kind of resource when undeployed (thus preventing
tomcat from beeing able to close and delete the jars). Maybe the destroy method lacks some
important cleanup.
> This bug is there at least since CXF 2.1.2 and still in 2.2.2.

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