I tried the same thing at the start of this week Pierre. To get it working I had to pull the Restlet code from SVN, drop in the new GWT jar files, and make a change to a single class;
ClientProxyGenerator Add a new method getTypeSerializerCreatorGWT2_2 with the correct constructor using GeneratorContextExt (in 2.1 it was just GeneratorContext). Other than this change it is a copy of the existing getTypeSerializerCreatorGWT2_1 On line 642 add another try block and make a call to this new method. Hope that helps. ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=2709299

