SEVERE: A web application created a ThreadLocal with key of type [org.apache.commons.lang.builder.ToStringStyle$1] (value [org.apache.commons.lang.builder.ToStringStyle$1@66a37d72]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.

I get this message with every hot redeploy, which is a little worrying. Anybody know what it's about?

This started with the latest Tomcat 6 version: 6.0.24. I'm pleased with this new version because it also pointed out politely that I hadn't closed a thread I'd opened.

I've fixed my Thread but I still get the message shown at the beginning of this email.

I don't use ThreadLocal in my code at all, so it's Tomcat who's creating this ThreadLocal for some reason, but since it's not mine it's something I can't do much about, presumably.

Thanks for any help you may be able to give.