Well, essentially you must translate the fixtures written in in C# to Java. Please take a look at the Fixtures wiki page (
http://code.google.com/p/silverlight-selenium/wiki/Fixtures) and at the source code (
http://code.google.com/p/silverlight-selenium/source/browse/#svn%2Ftrunk%2Fdotnet%2FSilvernium%2FFixtures). In the wiki page you will also find information about where to place the XAML and the DLL that contains the "server-side" part of the Fixtures (essentially, a connector known by the fixtures that will wrap your application). Also, note that this "server-side" part don't need to be translated, since all the communication between it and the fixtures is made via Javascript.
I also suggest you checkout the source code, open it on Visual Studio, run the Reference Application contained in the solution and run the unit tests contained in the FixturesTests project. By doing this, you will be able to see all the implemented fixtures in action interacting with the Reference Application.
Regards
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Marcelo Bukowski de Farias
marcelo...@gmail.com