Hi Fabio, sorry that it took a long time. But now I've took a look into your web application (http://restlet.tigris.org/issues/show_bug.cgi?id=730). I don't understand how the providers are added to the JaxRsApplication. Do you checked, if all MessageBodyWriters are available in the JaxRsRestlet or only one, e.g. with the debugger?
best regards Stephan ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=1245795

