why my driver is not invoking when called by a constructor?

Question

I created a POM structure where driver is initialized in the main class and called in page classes using constructor. The problem is that the url is also passed from one of a page class called s1 landing page but its not invoking, only chrome is getting opened. URL is not getting passed.

Main class

public class Sample1 {
    public static void main(String[] args) {
        String item = "ADIDAS ORIGINAL";
        WebDriverManager.chromedriver().setup();
        ChromeOptions options = new ChromeOptions();
        options.addArguments("--remote-allow-origins=*");
        WebDriver driver = new ChromeDriver(options);
        driver.manage().window().maximize();
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(5));

        S1LandingPage S1landingPage = new S1LandingPage(driver);
        S1landingPage.Goto();
        S1landingPage.login("sanasameer.k@gmail.com","Sana@1234");
    }
}

S1LandingPage

public class S1LandingPage extends Sample1 {
    WebDriver driver;

    public S1LandingPage(WebDriver driver) {
        driver = this.driver;
        PageFactory.initElements(driver, this); //to get driver for local variables made by find by 
    }

    @FindBy(id="userEmail")
    WebElement Uname;

    @FindBy(id="userPassword")
    WebElement pw;

    @FindBy(id="login")
    WebElement submit;

    public void login(String email, String passwrd) {
        Uname.sendKeys(email);
        pw.sendKeys(passwrd);
        submit.click();
    }

    public void Goto()  {
        driver.get("https://rahulshettyacademy.com/client/"); 
        driver.manage().window().maximize();
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(5));
    }
}

Error

Exception in thread "main" java.lang.NullPointerException
    at pageObjects.S1LandingPage.Goto(S1LandingPage.java:45)
    at rahulshety.EndtoEnd.Sample1.main(Sample1.java:33)

score 0 · Answer 1 · answered Apr 18 '23 at 19:39

Your assignment in the constructor is backwards.

public S1LandingPage(WebDriver driver) {
    driver = this.driver;
}

should be

public S1LandingPage(WebDriver driver) {
    this.driver = driver;
}

this references the current object, S1LandingPage. So, this.driver is the property driver on the S1LandingPage class and driver is the parameter driver.

See the docs on this usage.

why my driver is not invoking when called by a constructor?

1 Answers1