code: public void addELContextListener(ELContextListener listener)
      {
          Application application = getMyfacesApplicationInstance();
          if (application != null)
          {
              application.addELContextListener(listener);
              return;
          }
          throw new UnsupportedOperationException();
      }
docs: <p>
  Provide a way for Faces applications to register an <code>ELContextListener</code> that will be notified on
  creation of <code>ELContext</code> instances.
  <p>
  
  <p>
  An implementation is provided that throws <code>UnsupportedOperationException</code> so that users that decorate
  the <code>Application</code> continue to work.
  </p>
  
  @since 1.2