reate <code>ValueExpression</code>s and <code>MethodExpression</code>s so that EL
 expressions can be parsed and evaluated.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>A concrete implementation of the an <code>ExpressionFactory</code>.</dd></dl>
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<h4>addELContextListener</h4>
<pre>void&nbsp;addELContextListener(javax.el.ELContextListener&nbsp;listener)</pre>