DWR requires JDK 1.5 or later. Older JDK's may be used with the aid of a byte code weaver such as Retroweaver.
DWR requires a servlet engine that supports servlet spec version 2.2 or later. Earlier versions of the servlet spec may also work.
It is regularly tested in many operating environments including:
In version 1.0 we only know of 2 environments where DWR may cause problems. DWR fails when your app-server is fronted by a web server that alters URLs in a way that the app-server is not expecting and there may be some issues running with DWR in Vignette portal.
All other tested environments that DWR has been tested in seem to be running just fine.