ster an <code>ELResolver</code> after the application has received any request from the
 client. If an attempt is made to register an <code>ELResolver</code> after that time, an
 <code>IllegalStateException</code> is thrown.
 </p>
 <p>
 This restriction is in place to allow the JSP container to optimize for the common case where no additional
 <code>ELResolver</code>s are in the chain, aside from the standard ones. It is permissible to add
 <code>ELResolver</code>s before or after initialization to a <code>