xternal=true" title="class or interface in java.lang">IllegalStateException</a></code> - if this method is called on an already invalidated session</dd>
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<h4>isNew</h4>
<pre>boolean&nbsp;isNew()</pre>
<div class="block">Returns <code>true</code> if the client does not yet know about the session or if the client chooses not to join the
 session. For example, if the server used only cookie-based sessions, and