title: What happens if not exists a match transition inside a action-state in a spring webflow definition?
body: <p>I'm working in a java web application with spring (I'm starting with spring webflow).
  I am analyzing source code made ​​by another developer and I see something like this:</p>
  
  <p>FILE <strong>flow.xml</strong> :</p>
  
  <pre><code>...
  &lt;action-state id="state1"&gt;
      &lt;evaluate expression="Utilities.getSomeResult()"&gt;&lt;/evaluate&gt;
      &lt;transition on="RESULT1" to="doSomething1" /&gt;
      &lt;transition on="RESULT2" to="doSomething2" /&gt;
  &lt;/action-state&gt;
  ...
  </code></pre>
  
  <p>CLASS <strong>Utilities.java</strong> :</p>
  
  <pre><code>...
  public String getSomeResult() {
    switch(option) {
      case 1:
        return "RESULT1";
      case 2:
        return "RESULT2";
      case 3:
        return "RESULT3";
    }
  }
  ...
  </code></pre>
  
  <p>What happens if option == 3? some spring exception is thrown? some global transition must be defined to catch it? What is the best approach to solve this issue?</p>
  
  <p>Thank you in advance</p>