 java.lang" class="externalLink">IllegalStateException</a></code> - if the scope is PageContext.SESSION_SCOPE but the page that was requested does
                                  not participate in a session or the session has been invalidated.</dd>
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<h4>findAttribute</h4>
<pre class="methodSignature">public abstract&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Objec