title: Drools: Any value of a String list is member of another String list
body: <p>I'm having troubles to find how to check in drools if any value of a String list is member of another String list.</p>
  
  <pre><code>when
  
  //any value of stringList1 member of stringList2
  
  then 
  
  // whatever...
  </code></pre>
  
  <p>I guess, I may use the forall operation, but still couldn't find the way. Any help..?</p>
  
  <p>Let's say my validation bean is something like:</p>
  
  <pre><code> public final class StringListValidationBean {
  
     private List&lt;String&gt; stringList1;
     private List&lt;String&gt; stringList2;
     //... gets &amp; sets
  
   }
  </code></pre>