title: how do i show error/info/fatal messages in jsp when i using spring-webflow with POJO action?
body: <p>i am using spring-mvc(3.2.4) and spring-webflow(2.3.2) here.
  i define a flow like this:</p>
  
  <pre><code>&lt;flow&gt;
  &lt;decision-state id="check"&gt;
      &lt;if test="signupFlowAction.checkPrecondition(messageContext)" then="firstState" else="error" /&gt;
  &lt;/decision-state&gt;
  
  &lt;view-state id="firstState"&gt;
      ... 
  &lt;/view-state&gt;
  
  &lt;view-state id="error" view="error/bad-thing-happens"&gt;
      ...
  &lt;/view-state&gt;
  </code></pre>
  
  <p></p>
  
  <p>i want to check some business preconditions when the flow startup, so i using a POJO to do so.</p>
  
  <pre><code>public boolean checkPrecondition(MessageContext messageContext) {
  
      boolean oh_snap = true;
  
      if (oh_snap) {
          MessageResolver mr1 = new MessageBuilder().fatal().defaultText("fatal message here.").build();
          MessageResolver mr2 = new MessageBuilder().error().defaultText("error message here.").build();
          MessageResolver mr3 = new MessageBuilder().info().defaultText("info message here.").build();
  
          messageContext.addMessage(mr1);
          messageContext.addMessage(mr2);
          messageContext.addMessage(mr3);
      }
  
      return ! oh_snap;
  }
  </code></pre>
  
  <p>this code is fine, but i do not kown how to show the messages in jsp. 
  spring's taglibs did't work? i tried <code>&lt;spring:error path="*"/&gt;</code> nothing happened.</p>