e>java.security.Principal</code> that identifies the caller.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The <code>Principal</code> object that identifies the caller. This method never returns <code>null</code>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - The Container throws the excepti