Q:

Selenium using Java: Start Hub Server and register Nodes with Hub

I am new to the selenium and I have been trying to start Selenium Hub and adding the node to the Hub using java.  I have started it using command prompt but I want it to happen on its own.  I am able to start the Hub but have no Idea how to add the Node.  
Following is my code to start the Hub:
import org.openqa.grid.internal.utils.configuration. GridHubConfiguration;
import org.openqa.grid.internal.utils.configuration. GridNodeConfiguration;
import org.openqa.grid.web. Hub;

public class StartHub {

    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        GridHubConfiguration configHub = new GridHubConfiguration();
        configHub.host = "localhost";
        configHub.port = 8060;

        //GridNodeConfiguration configNode = new GridNodeConfiguration();
        //configNode.host = configHub.host;
        //configNode.port = 5300;

        Hub hub = new Hub(configHub);
        //configNode.getHubHost();
        hub.start();

        //System.out.println(configNode.getRemoteHost());

        //hub.stop();
    }

}

How to add a Node going forward ? 

A:

Selenium-Grid Server Version 2.x.x configuration. 

Their Packages list
« org.openqa.grid.internal.utils. GridHubConfiguration;
« org.openqa.selenium.server. SeleniumServer;

HUB Grid HUB Running as a standalone server: Hub is a central point which distributing tests on several node-machines, which are registered to it for parallel execution. 
Use GRID HUB Server:

To distribute your tests over multiple machines or virtual machines (VMs).  
You want to connect to a remote machine that has a particular browser version that is not on your current machine. 

Start HUB Server

loadFromCommandLine(String[] args) - Go through my previous post. 
loadFromJSON(String resource) - resource default/DefaultHub.json for instance

public class Grid_HUBServer {

    public static String HUBIP = GRIDINFO.HOSTIP.toString();
    public static Integer HUBPORT = 4444;
    static String separator = "\n------------------------\n";

    public static void hubServer() {
        try {
            GridHubConfiguration gridHubConfig = new GridHubConfiguration();
            gridHubConfig.setHost( HUBIP );
            gridHubConfig.setPort( HUBPORT );
            gridHubConfig.setNewSessionWaitTimeout( 50000 );
            File JOSNFile = new File(System.getProperty("user.dir")+"/gridHub.json" );
            gridHubConfig.loadFromJSON( JOSNFile.toString() );

            Hub hub = new Hub(gridHubConfig);
            hub.start();

            System.out.println("Nodes should register to " + hub.getRegistrationURL());
            System.out.format("%s Running as a grid hub: %s\n" +
                    "Console URL : %s/grid/console \n", separator,separator,hub.getUrl());

            System.out.println("Please Enter to stop service."); 
            System.in.read();
            System.in.read();

            hub.stop();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        hubServer();
    }
}

NODE [RC] has to post a request to HUB in order to register with it, by this URL - IP:Port//grid/register. 
public class Grid_NODEServer extends Grid_HUBServer {
    static Integer NODEPORT = 5555;
    static String PROXYCLASS = "org.openqa.grid.selenium.proxy. DefaultRemoteProxy";

    public static void nodeServer() {
        try {
            System.setProperty(ChromeDriverService. CHROME_DRIVER_EXE_PROPERTY, CHROME_DRIVER_EXE );
            System.setProperty(InternetExplorerDriverService. IE_DRIVER_EXE_PROPERTY, IE_DRIVER_EXE);

            RegistrationRequest request = new RegistrationRequest();
            request.setRole( GridRole. NODE );
            File JOSNFile = new File(System.getProperty("user.dir")+"/registerNode.json" );
            request.loadFromJSON( JOSNFile.toString() );

            Map<String, Object> configuration = new HashMap<String, Object>();

            URL remoteURL = new URL(String.format("http://%s:%d", HUBIP, HUBPORT) );
            System.out.println("Remote URL : "+remoteURL);
            configuration.put(RegistrationRequest. AUTO_REGISTER, true);
            configuration.put(RegistrationRequest. HUB_HOST, HUBIP);
            configuration.put(RegistrationRequest. HUB_PORT, HUBPORT);
            configuration.put(RegistrationRequest. REMOTE_HOST, remoteURL);

            configuration.put(RegistrationRequest. PORT, NODEPORT);

            configuration.put(RegistrationRequest. PROXY_CLASS, PROXYCLASS);
            configuration.put(RegistrationRequest. MAX_SESSION, 1);
            //configuration.put(RegistrationRequest. CLEAN_UP_CYCLE, 2000);
            //configuration.put(RegistrationRequest. MAX_INSTANCES, 1);

            request.setConfiguration( configuration );
            GridNodeServer node = new SeleniumServer( request.getConfiguration() );

            SelfRegisteringRemote remote = new SelfRegisteringRemote( request );
            remote.setRemoteServer( node );
            remote.startRemoteServer();
            System.out.format("Selenium Grid node is up and ready to register to the hub " +
                    "%s Running as a grid node: %s ", separator,separator);
            remote.startRegistrationProcess();

            System.out.println("Please Enter to stop service."); 
            System.in.read();
            System.in.read();

            remote.stopRemoteServer();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        nodeServer();
    }
}

Selenium-Grid - JSON Configuration Files for HUB & NODE are gridHub.json, registerNode.json to instantiate. 
{
  "host": null,
  "port": 4444,
  "newSessionWaitTimeout": -1,
  "servlets" : [],
  "prioritizer": null,
  "capabilityMatcher": "org.openqa.grid.internal.utils. DefaultCapabilityMatcher",
  "throwOnCapabilityNotPresent": true,
  "nodePolling": 5000,

  "cleanUpCycle": 5000,
  "timeout": 300000,
  "browserTimeout": 1800000,
  "maxSession": 5,
  "jettyMaxThreads":-1
}

{
  "capabilities":
      [
        {
          "browserName": "firefox",
          "version": "39.0",
          "firefox_binary": "C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe",
          "maxInstances": 5,
          "seleniumProtocol": "WebDriver"
        },
        {
          "browserName": "chrome",
          "version": "54.0",
          "maxInstances": 5,
          "seleniumProtocol": "WebDriver"
        },
        {
          "browserName": "internet explorer",
          "version": "11",
          "maxInstances": 1,
          "seleniumProtocol": "WebDriver"
        }
      ],
  "configuration":
  {
    "proxy": "org.openqa.grid.selenium.proxy. DefaultRemoteProxy",
    "role": "node",
    "host": "127.0.0.1",
    "port": 5555,

    "maxSession": 5,
    "cleanUpCycle":2000,
    "registerCycle": 10000,
    "nodeTimeout":120,
    "nodePolling":2000,

    "register": true,
    "hubPort": 4444,
    "hubHost": "127.0.0.1"
  }
}

Selenium-Grid Server Version 3.x.x (>= beta4) configuration. 

Their packages list - (org.seleniumhq.jetty9.server. Server)
« org.openqa.grid.internal.utils.configuration. GridHubConfiguration;
« org.openqa.selenium.remote.server. SeleniumServer;
« org.openqa.grid.internal.utils.configuration. GridNodeConfiguration;

//  HUB Configuration - org.openqa.grid.internal.utils.configuration. GridHubConfiguration
GridHubConfiguration gridHubConfig = new GridHubConfiguration();
gridHubConfig.host = HUBIP;
gridHubConfig.port = HUBPORT;
gridHubConfig.newSessionWaitTimeout = 50000;
File JOSNFile = new File(System.getProperty("user.dir")+"/gridHub.json" );
gridHubConfig.loadFromJSON( JOSNFile.toString() );

Hub hub = new Hub(gridHubConfig);
hub.start();

// NODE Configuration - org.openqa.selenium.remote.server. SeleniumServer
GridNodeConfiguration configuration = new GridNodeConfiguration();

File JOSNFile = new File(System.getProperty("user.dir")+"/registerNode2.json" );
configuration.loadFromJSON( JOSNFile.toString() );
configuration.role = GridRole.NODE.name();

URL remoteURL = new URL(String.format("http://%s:%d", HUBIP, HUBPORT) );
System.out.println("Remote URL : "+remoteURL);
RegistrationRequest request = new RegistrationRequest( configuration );

GridNodeServer node = new SeleniumServer( request.getConfiguration() );

SelfRegisteringRemote remote = new SelfRegisteringRemote( request );
remote.setRemoteServer( node );
remote.startRemoteServer();
remote.startRegistrationProcess();

Use different JSON format to overcome the Exception - org.openqa.grid.common.exception. GridConfigurationException: Error with the JSON of the config : Deprecated -nodeConfig file encountered. 
registerNode2.json
{
    "capabilities": [ ... ],

    "proxy": "org.openqa.grid.selenium.proxy. DefaultRemoteProxy",
    "role": "node",
    "host": "127.0.0.1",
    "port": 5555,

    "maxSession": 5,
    "cleanUpCycle":2000,
    "registerCycle": 5000,
    "nodePolling": 5000,
    "nodeStatusCheckTimeout": 5000,
    "unregisterIfStillDownAfter": 60000,
    "downPollingLimit": 2,
    "debug": false,

    "register": true,
    "hub": "http://localhost:4444",
    "servlets" : [],
    "withoutServlets": [],
    "custom": {}
}

