title: what is JSON REST interface
body: <p>Is there any tutorial on <strong>JSON RESTful interface</strong> (using <strong>JAVA servlet</strong>) ? The purpose is to call to external REST interface for data, and handle the data by the client(javascript client).</p>
  
  <p>I am not sure what kind of thing is exactly JSON REST interface in JAVA... I need some tutorials to start to learn, so...I ask here. </p>