" title="class in jakarta.ws.rs.core"><code>media type</code></a> of the event data.
 <p>
 This information is used to a select proper <a href="../../../../jakarta/ws/rs/ext/MessageBodyWriter.html" title="interface in jakarta.ws.rs.ext"><code>MessageBodyWriter</code></a> to be used for serializing the
 <a href="../../../../jakarta/ws/rs/sse/OutboundSseEvent.html#getData--"><code>event data</code></a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>data <a href="../../../../jakarta/ws/rs/c