java.lang.NullPointerException when running testcase via Selenium

Question

I am facing an issue with NullPointerException. I tried as much as possible but I'm unable to resolve this. I am implementing a POM model(Selenium) for my project.

The page:

public class VendorsHomePageApp 
{
    WebDriver driver;

    public VendorsHomePageApp(WebDriver driver)
    {
        this.driver=driver;
    }

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[1]/a")
    WebElement dashboardTab;

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[2]/a")
    WebElement tendersTab;

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[3]/a")
    WebElement notificationsTab;

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[1]/li[4]/a")
    WebElement profileTab;

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[2]/li/a")
    WebElement vendorName;

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[2]/li/ul/li[1]/a")
    WebElement vendorHelp;

    @FindBy(how=How.XPATH,using=".//*[@id='navbarCollapse']/ul[2]/li/ul/li[3]/a")
    WebElement vendorSignOut;

    @FindBy(how=How.XPATH,using="html/body/section/div/div/div/div[2]/div/table/tbody/tr[1]/td[1]/a")
    WebElement firstTender;

    @FindBy(how=How.XPATH,using="html/body/section/div/div/div/div[2]/div/table/tbody/tr[2]/td[1]/a")
    WebElement secondTender;

    @FindBy(how=How.XPATH,using="html/body/section/div/div/div/div[2]/div/table/tbody/tr[3]/td[1]/a")
    WebElement thirdTender;

    public void clickOnDashboardTab()
    {
        dashboardTab.click();
    }

    public void clickOnTendersTab()
    {
        tendersTab.click();
    }

    public void clickOnNotificationsTab()
    {
        notificationsTab.click();
    }

    public void clickOnProfileTab()
    {
        profileTab.click();
    }

    public void clickOnFirstTender()
    {
        firstTender.click();
    }
}

TestClass:

public class VendorsHomePageTest 
{
    public WebDriver driver;
    @Test
    public void verifyVendorsHomePageTest() throws Exception
    {
        LoginIntoVendors login=PageFactory.initElements(driver, LoginIntoVendors.class);
        login.verifyLoginVendors();

        VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);
        //driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

        Thread.sleep(3000);

        vhpapp.clickOnNotificationsTab();
        vhpapp.clickOnProfileTab();
        vhpapp.clickOnTendersTab();
        vhpapp.clickOnDashboardTab();
        vhpapp.clickOnFirstTender();
    }
}

Error log:

FAILED: verifyVendorsHomePageTest
java.lang.NullPointerException
    at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)
    at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)
    at com.sun.proxy.$Proxy4.click(Unknown Source)
    at com.digitalmqc.automation.vendorspages.VendorsHomePageApp.clickOnNotificationsTab(VendorsHomePageApp.java:60)
    at com.digitalmqc.automation.vendorstests.VendorsHomePageTest.verifyVendorsHomePageTest(VendorsHomePageTest.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:643)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:820)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1128)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
    at org.testng.TestRunner.privateRun(TestRunner.java:782)
    at org.testng.TestRunner.run(TestRunner.java:632)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:366)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319)
    at org.testng.SuiteRunner.run(SuiteRunner.java:268)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1169)
    at org.testng.TestNG.run(TestNG.java:1064)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:113)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:206)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:177)

Class:

public class LoginIntoVendors 
{
    @Test
    public void verifyLoginVendors() throws Exception
    {
        WebDriver driver= new FirefoxDriver();
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        driver.get("******");

        IntiationPage vendorInit=PageFactory.initElements(driver, IntiationPage.class);

        vendorInit.clickOnLoginButton();

        VendorsLoginAction Loginven=PageFactory.initElements(driver, VendorsLoginAction.class);

        Loginven.vendorlogin("***","***@gmail.com", "****");

        String title = driver.getTitle();
        System.out.println("Title is  :" + title  );
   }
}

Any help?

Please attach your stacktrace..else try to exception debugger in eclipse and that should tell u where NPE is — Mrunal Gosar
– Mrunal Gosar, Commented Jul 21, 2016 at 7:08
your driver seems to be null, instantiate your driver first. — Paras
– Paras, Commented Jul 21, 2016 at 7:16

Saurabh Gaur · Accepted Answer · 2016-07-21 07:59:55Z

1

You need to initialize your WebDriver first. As I seeing you are creating the reference of WebDriver but not initialized, try as below :-

WebDriver driver = new ChromeDriver(); //or other driver which you want

Note :- If you want to initialize ChromeDriver you need to download chromedriver and set system property before initialize driver as :-

System.setProperty("webdriver.chrome.driver", "path/to/chromedriver");

So details answer like as below :-

public class VendorsHomePageTest 

{
    public WebDriver driver;
    @Test
    public void verifyVendorsHomePageTest() throws Exception
    {
        System.setProperty("webdriver.chrome.driver", "path/to/chromedriver");
        driver = new ChromeDriver(); //or other driver which you want

        LoginIntoVendors login=PageFactory.initElements(driver, LoginIntoVendors.class);

        login.verifyLoginVendors();

        VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);

        //driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

        Thread.sleep(3000);

        vhpapp.clickOnNotificationsTab();

        vhpapp.clickOnProfileTab();

        vhpapp.clickOnTendersTab();

        vhpapp.clickOnDashboardTab();

        vhpapp.clickOnFirstTender();

    }

}

Edited :- You need to create separate class which gives you WebDriver instance as below :-

public class DriverInit {

    public WebDriver driver;
    private static DriverInit driverInit = null;

    public static DriverInit getInstance() {
        if (driverInit == null) {
            driverInit = new DriverInit();
        }
        return driverInit;
    }

    private DriverInit() {
        this.driver = new FirefoxDriver();
        this.driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        this.driver.get("******");
    }

    public WebDriver getDriver() {
        return this.driver;
    }

now you can call it into LoginIntoVendors as below :-

public class LoginIntoVendors 
{
    @Test
       public void verifyLoginVendors() throws Exception
       {
           WebDriver driver = DriverInit.getInstance().getDriver();

           IntiationPage vendorInit=PageFactory.initElements(driver, IntiationPage.class);

           vendorInit.clickOnLoginButton();

           VendorsLoginAction Loginven=PageFactory.initElements(driver, VendorsLoginAction.class);

           Loginven.vendorlogin("***","***@gmail.com", "****");

           String title = driver.getTitle();
           System.out.println("Title is  :" + title  );


       }
}

and in the VendorsHomePageTest as below :-

public class VendorsHomePageTest 

{
    public WebDriver driver;
    @Test
    public void verifyVendorsHomePageTest() throws Exception
    {

        driver = DriverInit.getInstance().getDriver();

        LoginIntoVendors login=PageFactory.initElements(driver, LoginIntoVendors.class);

        login.verifyLoginVendors();

        VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);

        //driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

        Thread.sleep(3000);

        vhpapp.clickOnNotificationsTab();

        vhpapp.clickOnProfileTab();

        vhpapp.clickOnTendersTab();

        vhpapp.clickOnDashboardTab();

        vhpapp.clickOnFirstTender();

    }

}

Hope it helps..:)

edited Jul 21, 2016 at 7:59

answered Jul 21, 2016 at 7:20

Saurabh Gaur

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9 Comments

sandeep kumar Over a year ago

Hi saurabh, I instantiate webdriver in the login class. login functionality is working fine but unable to proceed further.

Saurabh Gaur Over a year ago

@sandeepkumar then you need to pass that driver object from login class to VendorsHomePageApp class

Saurabh Gaur Over a year ago

@sandeepkumar could you share LoginIntoVendors class as well??

sandeep kumar Over a year ago

Please check the class

Saurabh Gaur Over a year ago

@sandeepkumar Yeah I cheked.. Problem with dirver as I saying you are creating dirver at LoginIntoVendors which does not return any refrence of the driver

|

Paras · Accepted Answer · 2016-07-21 07:23:18Z

0

Your driver seems to be null what you can do to avoid this situation is to instantiate your driver reference.

In your test class you can instantiate your driver.

public class VendorsHomePageTest {
    public WebDriver driver;
    @Test
    public void verifyVendorsHomePageTest() throws Exception {
        driver = new FirefoxDriver(); // or whatever browser you want.
        // Here you can initialise the elements in `PageObject` class.
        VendorsHomePageApp vhpapp= PageFactory.initElements(driver, VendorsHomePageApp.class);
        // Rest of your code
    }
}

answered Jul 21, 2016 at 7:23

Paras

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