Starting a new thread result in AccessControlException

[y]

When I try to start a new thread in a servlet, I get:
java.security.AccessControlException: access denied
(java.lang.RuntimePermission modifyThreadGroup)

Any idea why is that and how can I fix it?

Thanks

[Martin Trummer]

that is not related to GWT
it depends on what webserver/servicecontainer your application is
running on
e.g. Google App Engine won't let you create new threads