JAX-RPC is a dead standard that has been pruned in Java EE 6 (and might thus be removed from future versions). Reason for Pruning: JAX-RPC was an early attempt at modeling SOAP web services as RPC calls. Web services have since grown out of being an RPC model. The much more robust, feature-rich and popular JAX-WS API effectively supercedes JAX-RPC.
JAX-RS initially support restful web service nd JAX-WS initially supports web servidce with soap-style.
For the detail, please take the reference for link http://en.wikipedia.org/wiki/JAX-RS and http://en.wikipedia.org/wiki/Java_API_for_XML_Web_Services.
