n javax.net.ssl" class="externalLink"><code>SSL engines</code></a>. Must not be <code>null</code>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an updated client builder instance.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - in case the <code>sslContext</code> parameter is <co