.addFilterUrlMapping("filter", "/*", DispatcherType.REQUEST)
.addServletContextAttribute(javax.websocket.server.ServerContainer.class.getName(), deployment);
final PathHandler root = new PathHandler();
final ServletContainer container = ServletContainer.Factory.newInstance();
DeploymentManager manager = container.addDeployment(builder);
manager.deploy();
root.addPrefixPath(builder.getContextPath(), manager.start());
DefaultServer.setRootHandler(root);
return manager.getDeployment().getServletContext();