strange tomcat (error) message

Hello vaadiners

I get the following strange tomcat message in the Eclipse IDE console when my app is restarted/refreshed

Aug 19, 2011 5:18:22 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application
[/Dproject-VAADIN] appears to have started a thread named [AWT-Windows]
but has failed to stop it. This is very likely to create a memory leak.

what can cause this strange message?

How can I found/debug this tread/potential memory leak , and how can I get rid of this?



Apparently something is using AWT, which is starting a thread - are you by any chance using JFreeChart or something like that?
Anyway, I think starting tomcat with
might fix the issue.

Best Regards,