Tomcat 6.0.24のclearReferences系のエラーログ

Tomcat 6.0.24では(22あたりから?)、clearReferenceまわりの処理が強化したのか、以下のようなエラーログがでるようになってしまった。これはどうすれば良いのかね。Tomcatのコードをよく読まんとわからん…。

2010/02/09 6:26:01 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
致命的: A web application registered the JBDC driver [org.h2.Driver] but failed to
unregister it when the web application was stopped. To prevent a memory leak, the
JDBC Driver has been forcibly unregistered.
2010/02/09 6:26:01 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
致命的: A web application registered the JBDC driver [org.h2.Driver] but failed to
unregister it when the web application was stopped. To prevent a memory leak, the
JDBC Driver has been forcibly unregistered.
2010/02/09 6:26:01 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
致命的: A web application appears to have started a thread named [Seasar2-TimeoutManager]
but has failed to stop it. This is very likely to create a memory leak.
2010/02/09 6:26:01 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
致命的: A web application appears to have started a thread named [H2 Log Writer FESS]
but has failed to stop it. This is very likely to create a memory leak.
...

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