The main feature of DWR is its ease of use. DWR hides a lot of details from developers. This means that we can use AJAX functionality and we don't need to know about
The setup for DWR consists of copying the
dwr.jar file to the WEB-INF | lib directory in the application WAR file, and installing the application in the server before starting to use it. There are no special interfaces to implement in our own Java classes and it is even possible to develop a Java object completely transparently, so that the object doesn't know any DWR-specific classes. DWR provides well-documented APIs for us to use, and we can take advantage of it when developing, for example, Reverse AJAX applications.
And finally we can leverage the existing Java skills because DWR does not force us to replace...