GWT-RPC is just one convenient way to communicate with a server using GWT. However GWT-RPC uses its own serialization format that is based on JSON. While convenient to use GWT-RPC also has some pain points that are often discovered later.
If you just want to make a POST / GET to an URL and transfer some serialized data (JSON, XML, custom) you can use GWT's RequestBuilder class (which is actually used internally by GWT-RPC as well). In order to get your XML going you can use GWT's XML API http://www.gwtproject.org/doc/latest/DevGuideCodingBasicsXML.html or use a library that maps from Java POJOs to/from XML. As example of such a library take a look at https://github.com/hpehl/piriti
The above should allow you to not rewrite all the server side code.
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