NullpointerException while invoking SendKeys through Selenium using PageFactory with Page Object

Question

I have three classes. One for getting all elements from the Webpage, one for performing actions with those elements and one for the test scripts. I get a null pointer exception when I call a function from the test script. I figured out this is because I use @FindBy annotation, but I don't know how to fix this.

Elements Class:

public class LoginPageElements {

    @FindBy(id="loginId")
    private static WebElement userNameTextBox;

    @FindBy(id="password")
    private static WebElement userPasswordTextBox;

    @FindBy(id="QTP_LoginButton")
    private static WebElement loginButton;

    public static WebElement getUserNameTextBox(WebDriver driver){
        WebElement a=driver.findElement(By.id("loginId"));
        return a;
    }

    public static WebElement getUserPasswordTextBox(){
        return userPasswordTextBox;
    }

    public static WebElement getLoginButton(){
        return loginButton;
    }
}

Actions Class:

public class LoginPageActions {

        public static void login(WebDriver driver,String username,String password){
            WebElement a=LoginPageElements.getUserNameTextBox(driver);
            a.sendKeys(username);
            LoginPageElements.getUserPasswordTextBox().sendKeys(password);
            LoginPageElements.getLoginButton().click();
        }

    }

Test script:

public class Sample {
     public static String driverPath = "D:/Selenium/Chrome Driver latest/chromedriver.exe";
     public static WebDriver driver;
public static void main(String[] args) {
System.setProperty("webdriver.chrome.driver", driverPath);

    ChromeOptions options = new ChromeOptions();
    options.addArguments("test-type");
    options.addArguments("start-maximized");
    options.addArguments("--js-flags=--expose-gc");
    options.addArguments("--enable-precise-memory-info");
    options.addArguments("--disable-popup-blocking");
    options.addArguments("--disable-default-apps");
    options.addArguments("--enable-automation");
    options.addArguments("test-type=browser");
    options.addArguments("disable-infobars");
    options.addArguments("--disable-extensions");
    options.setExperimentalOption("useAutomationExtension", false);

    driver = new ChromeDriver(options);

    driver.get("http://10.235.80.106:8080");

    LoginPageActions.login(driver,"acb", "adasd");
}

There is no exception when I pass the WebDriver object from the test script to the element class. The problem occurs when I use the elements initialized with FindBy annotations because of no WebDriver instantiation. How do I fix this? Thanks

Why are you using @FindBy and WebElement a=driver.findElement(By.id("loginId"));? — Plog
– Plog, Commented Jul 7, 2017 at 10:21
Copy in the stack trace for the null point exception to your question.. — StefanE
– StefanE, Commented Jul 7, 2017 at 10:23
I do not mean to offend you @kaushik3993 but you are missing knowledge about Object Oriented Programming. Try to understand what a constructor is and how does static keyword affects your code. — Fenio
– Fenio, Commented Jul 7, 2017 at 10:28
@Plog I was just testing to see if @FindBy is the problem. I haven't learnt PODM completely yet. — kaushik3993
– kaushik3993, Commented Jul 7, 2017 at 11:31
@RafałLaskowski Thanks for your suggestion. But can you tell me why I shouldn't use static methods there? I could have passed driver through a constructor to achieve that but since those were static methods, I was looking for a better solution. — kaushik3993
– kaushik3993, Commented Jul 7, 2017 at 11:37

Plog · Accepted Answer · 2017-07-07 13:54:03Z

3

You can continue to use the @FindBy annotations you just need to make sure you initialise the WebElements. To do this you should initialise your LoginPageElements using PageFactory:

LoginPageElements loginPageElements = PageFactory.initElements(webDriver, LoginPageElements.class);

where webDriver is an instance of the WebDriver you are using to run the selenium tests.

edited Jul 7, 2017 at 13:54

answered Jul 7, 2017 at 10:25

Plog

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undetected Selenium · Accepted Answer · 2017-07-07 10:41:12Z

2

You need to declare the WebDriver instance and add the constructor in LoginPageElements & LoginPageActions class as:

LoginPageElements class:

WebDriver driver;

//constructor
public LoginPageElements(WebDriver loginDriver)
{
    this.driver=loginDriver;
}

LoginPageActions class:

WebDriver driver;

//constructor
public LoginPageActions(WebDriver loginDriver)
{
    this.driver=loginDriver;
}

Let me know if this Answers your Question.

edited Jul 7, 2017 at 10:41

answered Jul 7, 2017 at 10:22

undetected Selenium

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