[pluginupload] order

Hi,
I try to use the pluginUpload restlet.
I try with firefox and a Java client, it does not work at all.
with firefox, I've the following error:
Error while calling seam aware Restlet: In attribute requires value for component: pluginUploadRestlet.navigationContext
with the URL : 
http://localhost:8080/nuxeo/restAPI/default/f6853dc1-1f9c-4f3b-aaef-311bec830f6a/pluginUpload/xavier/test?repo=default&docid=f6853dc1-1f9c-4f3b-aaef-311bec830f6a

any issue ?

Is it possible to call the pluginUpload with a Java client ?

and to finish, Do I have to create the document (on the server) before uploading it ?

If someone could help me...

I hope that someone will read this message because this forum seems to be inactive....

Thanks in advance,
Regards,
Xavier.