localnode.json

{
"capabilities":
	[
		{
			"browserName":"firefox",
			"maxInstances":1
		},
		{
			"browserName":"chrome",
			"maxInstances":1
		},
		{
			"browserName":"internet explorer",
			"maxInstances":1
		}
	],
"configuration":
	{
		"cleanUpCycle":2000,
		"timeout":30000,
		"proxy":"org.openqa.grid.selenium.proxy.WebDriverRemoteProxy",
		"maxSession":1,
		"url":"http://ip:5555/wd/hub",
		
	}
}

samperos.java

private void launchEverything() {
		try {
			GridHubConfiguration config = new GridHubConfiguration();
			config.setPort(4444);
			hub = new Hub(config);
			URL hubURL = hub.getUrl();

			hub.start();

			JSONObject request = JSONConfigurationUtils.parseRegistrationRequest("localnode.json");

			JSONObject jsonConfig = request.getJSONObject("configuration");
			int port = jsonConfig.getInt("port");
			RemoteControlConfiguration c = new RemoteControlConfiguration();
			c.setPort(port);
			node = new SeleniumServer(c);
			node.boot();

			URL registration = new URL("http://localhost:4444/grid/register");
			registerToHub(registration, request.toString());
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	private static void registerToHub(URL registrationURL, String json) {
		try {
			BasicHttpEntityEnclosingRequest r = new BasicHttpEntityEnclosingRequest("POST", registrationURL.toExternalForm());
			r.setEntity(new StringEntity(json));

			DefaultHttpClient client = new DefaultHttpClient();
			HttpHost host = new HttpHost(registrationURL.getHost(), registrationURL.getPort());
			HttpResponse response = client.execute(host, r);
			if (response.getStatusLine().getStatusCode() != 200) {
				throw new RuntimeException("Error sending the registration request.");
			}
		} catch (Exception e) {
			throw new RuntimeException("Error sending the registration request.", e);
		}
	}