title: org.springframework.expression-3.1.0.M2.jar has no source attachment
body: <p>I am working on spring mvc 3.0 that integrated spring-social-facebook. When I debug the code, there is an error at line </p>
  
  <pre><code>List&lt;Connection&lt;?&gt;&gt; connections = connectionRepository.findConnections(providerId);
  </code></pre>
  
  <p>in the following method</p>
  
  <pre><code>@RequestMapping(value="/{providerId}", method=RequestMethod.GET)
  public String connectionStatus(@PathVariable String providerId, 
                                 NativeWebRequest request, 
                                 Model model) {...} 
  </code></pre>
  
  <p>and controller is ConnectController</p>
  
  <p>Eclipse shows</p>
  
  <p><strong>Source not found</strong></p>
  
  <p>And when i keep the line inside try catch block, then error message is</p>
  
  <blockquote>
    <p>Expression parsing failed; nested exception is
    org.springframework.expression.spel.SpelEvaluationException:
    EL1007E:(pos 22): Field or property 'name' cannot be found on null</p>
  </blockquote>
  
  <p>I have added the org.springframework.expression-3.1.0.M2.jar file in WEB-INF/lib. I have also tried this using "Add External Jars..". Any help would be appreciated.</p>