Setting up Selenium Grid using Script

Question

Setting up selenium Grid:

I was able to set up grid (hub & node) using below commands in command prompt and then able to launch browsers and execute test successfully.

    java -jar selenium-server-standalone-3.4.0.jar -role hub
    java -jar selenium-server-standalone-3.4.0.jar -role webdriver -hub "http://localhost:4444/grid/register" -port 5566

When trying to setup selenium grid via script, i was able to setup hub and node successfully, but not able to launch the browser.

Kindly help to resolve the issue.

Please find the code and console below:

    package config.HubNode;

    import java.net.MalformedURLException;  
    import java.net.URL;    
    import org.openqa.grid.common.RegistrationRequest;  
    import org.openqa.grid.internal.utils.SelfRegisteringRemote;  
    import org.openqa.grid.internal.utils.configuration.GridHubConfiguration;  
    import org.openqa.grid.internal.utils.configuration.GridNodeConfiguration;  
    import org.openqa.grid.web.Hub;  
    import org.openqa.selenium.Platform; 
    import org.openqa.selenium.WebDriver;  
    import org.openqa.selenium.remote.DesiredCapabilities;
    import org.openqa.selenium.remote.RemoteWebDriver;

    public class HubNodeConfig {

    public static void main(String[] args) throws Exception {

        HubNodeConfig objHubNodeConfig = new HubNodeConfig();
        objHubNodeConfig.HubConfig();
        System.out.println("Hub Configured Successfully");

        objHubNodeConfig.NodeConfig();
        System.out.println("Node Configured to Hub Successfully");
        objHubNodeConfig.InvokeBrowser();
    }

    public void HubConfig() throws Exception
    {
        GridHubConfiguration gridHubConfig = new GridHubConfiguration();
        gridHubConfig.role = "hub";
        gridHubConfig.host = "localhost";
        gridHubConfig.port = 4444;

        Hub myHub = new Hub(gridHubConfig);
        myHub.start();
    }

    public void NodeConfig()
    {
        GridNodeConfiguration gridNodeConfig = new GridNodeConfiguration();
        gridNodeConfig.hub = "http://localhost:4444/grid/register"
        gridNodeConfig.host = "192.xxx.xx.xx" //my ip address
        gridNodeConfig.port = 5566;
        gridNodeConfig.role = "webdriver";

        RegistrationRequest req = new RegistrationRequest(gridNodeConfig);
        req.getConfiguration();
        req.validate();
        RegistrationRequest.build(gridNodeConfig);

        SelfRegisteringRemote remote = new SelfRegisteringRemote(req);
        remote.startRegistrationProcess();
    }

    public void InvokeBrowser() throws MalformedURLException
    {
        System.setProperty("webdriver.chrome.driver", "E:\\chromedriver.exe");
        DesiredCapabilities capability = DesiredCapabilities.chrome();
        capability.setBrowserName("chrome");
        capability.setPlatform(Platform.WIN10);

        WebDriver driver = new RemoteWebDriver(new URL("http://"+gridNodeConfig.host+":"+gridNodeConfig.port+"/wd/hub"), capability);
        System.out.println("Driver Launched Successfully");
        driver.get("https://google.com");
    }
    }

Console error message and Screenshot of the Grid:



    2017-07-20 23:57:17.135:INFO::main: Logging initialized @2576ms to org.seleniumhq.jetty9.util.log.StdErrLog    
    Jul 20, 2017 11:57:17 PM org.openqa.grid.web.Hub initServer
    INFO: Will listen on 4444    
    2017-07-20 23:57:17.509:INFO:osjs.Server:main: jetty-9.4.3.v20170317     
    2017-07-20 23:57:17.569:INFO:osjs.session:main: DefaultSessionIdManager workerName=node0    
    2017-07-20 23:57:17.570:INFO:osjs.session:main: No SessionScavenger set, using defaults    
    2017-07-20 23:57:17.573:INFO:osjs.session:main: Scavenging every 600000ms    
    2017-07-20 23:57:17.592:INFO:osjsh.ContextHandler:main: Started o.s.j.s.ServletContextHandler@1a1d6a08{/,null,AVAILABLE}    
    2017-07-20 23:57:17.804:INFO:osjs.AbstractConnector:main: Started ServerConnector@77f99a05{HTTP/1.1,[http/1.1]}{0.0.0.0:4444}    
    2017-07-20 23:57:17.804:INFO:osjs.Server:main: Started @3245ms    
    Hub Configured Successfully    
    Jul 20, 2017 11:57:19 PM org.openqa.grid.internal.utils.SelfRegisteringRemote$1 run    
    INFO: Starting auto registration thread. Will try to register every 5000 ms.    
    Jul 20, 2017 11:57:19 PM org.openqa.grid.internal.utils.SelfRegisteringRemote registerToHub    
    INFO: Registering the node to the hub: http: //localhost:4444/grid/register    
    Node Configured to Hub Successfully    
    Jul 20, 2017 11:57:19 PM org.openqa.grid.internal.Registry add    
    INFO: Registered a node http: //192.xxx.xx.xx:5566    
    Jul 20, 2017 11:57:19 PM org.openqa.grid.internal.utils.SelfRegisteringRemote registerToHub   
    INFO: The node is registered to the hub and ready to use    

    Exception in thread "main" 
    org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.    
    Build info: version: '3.4.0', revision: 'unknown', time: 'unknown'
    System info: host: 'KRISH', ip: '192.xxx.xx.xx', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_131'    
    Driver info: driver.version: RemoteWebDriver
        at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:658)
        at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:250)
        at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:236)
        at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:137)
        at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:174)
        at config.HubNode.HubNodeConfig.InvokeBrowser(HubNodeConfig.java:71)
        at config.HubNode.HubNodeConfig.main(HubNodeConfig.java:29)
     Caused by: org.apache.http.conn.HttpHostConnectException: Connect to 192.xxx.xx.xx:5566 [/192.xxx.xx.xx] failed: Connection refused: connect 
        at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:159)
        at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:359)
        at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
        at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
        at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
        at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
        at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
        at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72)
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
        at org.openqa.selenium.remote.internal.ApacheHttpClient.fallBackExecute(ApacheHttpClient.java:139)
        at org.openqa.selenium.remote.internal.ApacheHttpClient.execute(ApacheHttpClient.java:87)
        at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:343)
        at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:159)
        at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:142)
        at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:637)
        ... 6 more
    Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
        at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
        ... 21 more

    >Jul 21, 2017 12:15:30 AM org.openqa.grid.selenium.proxy.DefaultRemoteProxy onEvent     
    INFO: Marking the node http: //192.xx.xx.xx:5566 as down: cannot reach the node for 2 tries    
    Jul 21, 2017 12:16:30 AM org.openqa.grid.selenium.proxy.DefaultRemoteProxy onEvent    
    INFO: Unregistering the node http: //192.xx.xx.xx:5566 because it's been down for 60077 milliseconds    
    Jul 21, 2017 12:16:30 AM org.openqa.grid.internal.Registry removeIfPresent    
    WARNING: Cleaning up stale test sessions on the unregistered node http: //192.xx.xx.xx:5566    
    Jul 21, 2017 12:16:34 AM org.openqa.grid.internal.utils.SelfRegisteringRemote registerToHub    
    INFO: Registering the node to the hub: http: //localhost:4444/grid/register    
    Jul 21, 2017 12:16:34 AM org.openqa.grid.internal.Registry add    
    INFO: Registered a node http: //192.xx.xx.xx:5566    
    Jul 21, 2017 12:16:34 AM org.openqa.grid.internal.utils.SelfRegisteringRemote registerToHub    
    INFO: The node is registered to the hub and ready to use    
    Jul 21, 2017 12:16:46 AM org.openqa.grid.selenium.proxy.DefaultRemoteProxy onEvent    
    INFO: Marking the node http: //192.xx.xx.xx:5566 as down: cannot reach the node for 2 tries

Screenshot of Grid Console

Krishnan Mahadevan · Accepted Answer · 2017-07-21 09:57:50Z

5

Your code that starts the node has issues. Please fix it as below.

The method nodeConfig() doesn't inject in a server into the SelfRegisteringRemote.

Here's how it should look like:

RegistrationRequest req = RegistrationRequest.build(gridNodeConfig);
SelfRegisteringRemote remote = new SelfRegisteringRemote(req);
remote.setRemoteServer(new SeleniumServer(gridNodeConfig));
remote.startRemoteServer();
remote.startRegistrationProcess();

Also please change your RemoteWebDriver instantiation code to as below

WebDriver driver = new RemoteWebDriver(new URL("http://" + gridHubConfig.host + ":" + gridHubConfig.port + "/wd/hub"), capability);

Notice that we are connecting to the gridHubConfig host and its port and not that of the node (which is what your code was doing).

Once you fix these issues, your code should work fine and you should see an embedded Grid spun off via your code.

answered Jul 21, 2017 at 9:57

Krishnan Mahadevan

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11 Comments

krishnakumar Over a year ago

Thanks. I was able to launch browser if i setup same machine as host and node. But if hub and node machines are different, i am getting the error message "Error forwarding the new session Error forwarding the request Connect to 169.xxx.xxx.xxx:5556 [/169.xxx.xxx.xxx] failed: Connection refused: connect"

Krishnan Mahadevan Over a year ago

What exactly are you trying to do ? Are you trying to register a node with an already running hub ?

krishnakumar Over a year ago

one machine will be hub and other machines will be nodes(may be five nodes), i will have my code being executed from one machine(hub), the execution should take place in other machines(nodes)

Krishnan Mahadevan Over a year ago

What execution are you talking about? You cannot spin off a node on a different machine. For you to be able to do what you are trying, you would need to start the hub and the nodes manually on each of the nodes and then finally run your tests against it. You cannot create a Grid dynamically on remote machines before starting to run your tests.

Krishnan Mahadevan Over a year ago

@xtechkid - Why do you have your CI system start the hub ? Why can't it be something to which your tests just connect to ? If you are looking for a self healing grid, you can take a look at SeLion grid that we built which has this capability. I have explained Self Healing as a concept in this blog post of mine.

|

alokkr016 · Accepted Answer · 2024-02-18 19:32:41Z

0

Here is my solution

import java.net.MalformedURLException;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.grid.Main;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.BeforeSuite;
import org.testng.annotations.Optional;
import org.testng.annotations.Parameters;

import io.github.bonigarcia.wdm.WebDriverManager;

public class BaseTest {

    protected WebDriver driver;
    private String gridUrl = "http://localhost:4444/wd/hub";
    
    
    @BeforeSuite
    public void initializeWebDriverManagerAndGrid() {
        WebDriverManager.chromedriver().setup();
        Main.main(new String[] { "standalone", "--port", "4444" });
    }

    @Parameters("browser")
    @BeforeClass
    public void setUpWebDriver(@Optional("edge") String browser) throws MalformedURLException {

        
        switch (browser.toLowerCase()) {
        case "chrome":
            driver = WebDriverManager.chromedriver().remoteAddress(gridUrl).create();
            break;
        case "firefox":
            driver = WebDriverManager.firefoxdriver().remoteAddress(gridUrl).create();
            break;
        case "edge":
            driver = WebDriverManager.edgedriver().remoteAddress(gridUrl).create();
            break;
        default:
            throw new IllegalArgumentException("Unsupported browser: " + browser);
        }
        
        driver.manage().window().maximize();
    }

    @AfterClass
    public void quitWebDriver() {
        if (driver != null) {
            driver.quit();
        }
    }
}

answered Feb 18, 2024 at 19:32

alokkr016

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