title: Found multiple versions of the required class javax.faces.FactoryFinder
body: <p>I started on JSF2.0.
  I followed a tutorial with no problem and all worked fine! I used Eclipse Helios.
  But I noticed something I can not understand.
  The tutorial said to add Project Facet for JSF 2.
  I did no such thing and all worked ok. So to follow tutorial exactly I did:  </p>
  
  <p><em>Right-click on Project -> Properties -> Project Facets</em></p>
  
  <p>And JavaServer Faces facet check-box was not ticked. I assume this is what the tutorial means by Project Facet. I clicked on it and a </p>
  
  <p><em>Further Configuration Needed</em>  </p>
  
  <p>link appeared. I followed the link to a JSF capabilities (Modify Faceted Project) dialog, I selected as User library, my library of JSF(which is MyFaces) but I got the <strong>error</strong> message:  </p>
  
  <blockquote>
    <p>Found multiple versions of the required class javax.faces.FactoryFinder.</p>
  </blockquote>
  
  <p>What is this error? Can't I add project facet after creating my project?
  And what do I need the project facet for?
  My (trivial) code indicates that JSF works ok, so what is the project Facet useful for?  </p>