I think this is somewhat similar to my problem.
Check my thread: 
http://groups.google.com/group/h2-database/browse_thread/thread/d4e7e2944969ad0c


On Mar 31, 8:49 pm, Geert Jan Alsem <[email protected]> wrote:
> I'm setting up a web app on Tomcat. Using H2 seems to work great, except
> for a warning that keeps popping up in the Tomcat logs:
>
> SEVERE: The web application [/TestApp] registered the JDBC 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.
>
> At first I had more similar warnings about H2 memory leaks, but they went
> away when I registered the DbStarter listener in my web.xml:
>
> ...
> <context-param>
> <param-name>db.url</param-name>
> <param-value>jdbc:h2:~/test</param-value>
> </context-param>
> <context-param>
> <param-name>db.user</param-name>
> <param-value>test</param-value>
> </context-param>
> <context-param>
> <param-name>db.password</param-name>
> <param-value>test</param-value>
> </context-param>
> <listener>
> <listener-class>org.h2.server.web.DbStarter</listener-class>
> </listener>
> ...
>
> But the warning I mentioned above remains. Is this normal, or am I
> forgetting something?

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