ode>LambdaExpression</code> can be
invoked by supplying the actual parameters at evaluation.  It plays
an important role in the support for collections operators.</p>

<h3><a name="EvaluationListener">Evaluation Listeners</a></h3>
<p>By registering <a href="../../jakarta/el/EvaluationListener.html" title="class in jakarta.el"><code>EvaluationListener</code></a>s in ELContext, a user can
receive notifications during the Jakarta Expression Language expression evaluations.  
There are three events that trigger