public HttpResponse doRestart() throws IOException, ServletException {
validateAdmin();
try {
channel.call(new StopHubCallable());
} catch (Exception e) {
throw new IOException(e);
}
channel.close();
try {
startHub();
waitForHubLaunch();
} catch (Exception e) {
throw new IOException(e);
}
return HttpResponses.forwardToPreviousPage();
}
