final HttpServer server = new HttpServer();
SocketListener listener = new SocketListener();
listener.setPort(portNumber);
listener.setMinThreads(1);
listener.setMaxThreads(httpThreads);
server.addListener(listener);
HttpContext context = new HttpContext();
context.setContextPath("/");
context.setAttribute(AzkabanServletContextListener.AZKABAN_SERVLET_CONTEXT_KEY, app);
server.addContext(context);