title: Spring Design By Contract: where to start?
body: <p>I am trying to put a "Contract" on a method call. My web application is in Spring 3. </p>
  
  <p>Is writing customs Annotations the right way to go. If so, any pointers( I didn't find anything in spring reference docs).</p>
  
  <p>Should I use tools like "Modern Jass", JML ...? Again any pointers will be useful.</p>
  
  <p>Thanks</p>