title: What is annotation processing in Java?
body: <p>Quoting, <a href="http://java.sun.com/docs/books/tutorial/getStarted/problems/index.html" rel="noreferrer">Sun's Official Java Tutorial</a></p>
  
  <blockquote>
    <p>Class names, 'HelloWorldApp', are only
    accepted if annotation processing is
    explicitly requested</p>
  </blockquote>
  
  <p>What does it mean? And how to apply it?</p>