Jetty server handling 1 request at a time

Question

Hi, I'm very new to Jetty and have a simple server following their HelloWorld example using a SessionHandler. My class is called OrbVend and it extends SessionHandler. I have overridden doHandle and my main is as follows:

 public static void main(String[] args) throws Exception
  {
    Server server = new Server(8999);

    SessionIdManager idManager = new HashSessionIdManager();
    SessionManager sessionManager = new HashSessionManager();
    SessionHandler handler = new OrbVend(sessionManager);
    server.setHandler(handler);
    sessionManager.setIdManager(idManager);
    sessionManager.setSessionHandler(handler);

    server.start();
    server.join();
  }

I put a simple Thread.sleep in my doHandle and I try to hit the server with 2 requests at the same time. The second request does not even enter the doHandle method until the first one exits. I assume that this Jetty SessionHandler is backed by a Servlet and therefore can handle multiple requests simultaneously. Am I doing something wrong that is preventing this?