title: How to add multiple custom-filter in Spring Security 3?
body: <p>I need add two custom filters for FORM_LOGIN_FILTER, e.g. </p>
  
  <pre><code>&lt;custom-filter after="FORM_LOGIN_FILTER" ref="myUsernamePasswordAuthenticationFilter" /&gt;
  &lt;custom-filter after="FORM_LOGIN_FILTER" ref="myUsernamePasswordAuthenticationFilter2" /&gt;
  </code></pre>
  
  <p>What I expect the filter sequences is:<br/>
  1. Predefind FORM_LOGIN_FILTER<br/>
  2. myUsernamePasswordAuthenticationFilter<br/>
  3. myUsernamePasswordAuthenticationFilter2<br/></p>
  
  <p>But above will cause configuration error.
  So, anyone knows how to write the right config?
  Thanks!</p>