I certainly hope that not too many (preferably none) of the questions on the SCDJWS 6 exam pertain to ReST services that use the HTTP POST method. In fact, even as more of a SOAP fan, I can understand why some services are better off as ReST, when using the HTTP GET method.
But trying to code a decent client that sends and receives an HTTP POST to a ReST Service, using Dispatch<source>.invoke() seems overly complex, error prone, not to mention the handling of the request on the server side.
SCJP - 1.4
SCJD - (B&S) Used 1.5 And It Runs On Solaris10
SCWCD - Thanks to HFSJ!!