CompositeELResolver</code> that is already in
 the chain.
 </p>

 <p>
 It is not possible to remove an <code>ELResolver</code> registered with this method, once it has been registered.
 </p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>resolver</code> - The new <code>ELResolver</code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang