title: how to find plugin id in eclipse rcp application
body: <p>is there a API method to get current plugin's id?</p>
  
  <p>note : my rcp application contains more than one plugin project, some of them don't contains a Plugin class(the Activator  class)</p>
  
  <p>so I can't get plugin id use such method:</p>
  
  <pre><code>Plugin.getBundle().getSymbolicName();
  </code></pre>