While our test setup doesn’t specifically test on JBoss, the generic nature of DWR usually means it runs on all servlet containers. Reverse Ajax behaviour may differ a bit between platforms but if you are not using that then I wouldn’t expect any problems.
I would advise you though to upgrade to the latest version (3.0.2), f ex for getting the latest security updates. Most projects can upgrade seamlessly from 2.x to 3.x.