I have found a way to set the idle timeout for Jetty 11 WebSocket connections programmatically by invoking factory.setIdleTimeout in an implementation of the JettyWebSocketServlet.configure(JettyWebSocketServletFactory factory) method. I wonder…

• if that’s the recommended approach, and
• whether the timeout value can be externalized, e.g. via an XML configuration file? As it seems, the following solution does not work for WebSockets:

<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_3.dtd">
<Configure id="Server" class="org.eclipse.jetty.server.Server">
  <Call name="addConnector">
    <Arg>
      <New class="org.eclipse.jetty.server.ServerConnector">
        <Arg name="server"><Ref refid="Server"/></Arg>
        <Set name="idleTimeout">90000</Set>
      </New>
    </Arg>
  </Call>
</Configure>