 underlying <a href="../client/WebTarget.html" title="interface in jakarta.ws.rs.client"><code>web target</code></a> and start processing incoming
 <a href="InboundSseEvent.html" title="interface in jakarta.ws.rs.sse"><code>events</code></a>.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalState