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Unfortunately GWT has not made it easy to use continuations within their RPC mechanism.
Firstly they catch Throwable, so he Jetty RetryException is caught.
Secondly they have made most of the methods on the GWT servlet final, so you cannot fix this by extension.
Luckily GWT is open source under the apache 2.0 license, so it was possible to do a cut/paste/edit job to fix this.
The OpenRemoteServiceServlet recently added to Jetty is version of GWTs RemoteServiceServlet
without the final methods and a protected method for extending exception handling.
We are lobbying Google to make this part of the next release.
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[[GWT and Jetty Continuations|http://blogs.webtide.com/gregw/2006/12/07/1165517549286.html]]