[当我使用pojo时，我遇到异常了吗？

Question

大家好，请检查我的代码

public class Sample1 extends Sample {
        public static void main(String[] args) {
        System.setProperty("webdriver.chrome.driver",
                "C:\\Users\\Balaji-PC\\cucumber\\SamplePro\\driver\\chromedriver.exe");
        WebDriver driver = new ChromeDriver();
        driver.get("https://www.facebook.com/");
        driver.manage().window().maximize();

        Sample s= new Sample1();
        WebElement d = s.getUsername();

        d.sendKeys("lsmanikandan");
        s.getPassword().sendKeys("manikandan");
    }
}

请在我的pojo课下面检查

public class Sample {
    WebDriver driver;
    public Sample() {
        PageFactory.initElements(driver, this);
    }

    @FindBy(id = "email")
    private WebElement username;

    @FindBy(id = "pass")
    private WebElement password;

    public WebElement getUsername() {
        return username;
    }

    public WebElement getPassword() {
        return password;
    }

}

请在下面找到例外

线程“主”中的异常java.lang.NullPointerExceptionorg.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement（DefaultElementLocator.java:69）在org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke（LocatingElementHandler.java:38）在com.sun.proxy。$ Proxy4.sendKeys（未知来源）处org.test.Sample1.main（Sample1.java:18）

Answer 1

代码中的问题是您没有将驱动程序状态从子类Sample 1传递到基类Sample。

魔术在于这三点

1. 在Child类中添加参数化的构造函数-Sample1

   public Sample1（WebDriver driver）{super（driver）; }

2. 在父类中添加参数化的构造函数-示例

   公共样本（WebDriver驱动程序）{PageFactory.initElements（driver，this）;System.out.println（“页面工厂已启动”）;}

3. 通过传递驱动程序在Parent类中创建到被调用页面工厂的对象。

   Sample s = new Sample1（driver）;

   public class Sample {
   WebDriver driver;
   public Sample(WebDriver driver) {
       PageFactory.initElements(driver, this);
       System.out.println("Page Factory started");
   }
   
   @FindBy(id = "email")
   private WebElement username;
   
   @FindBy(id = "pass")
   private WebElement password;
   
   public WebElement getUsername() {
       System.out.println(username.getAttribute("data-testid"));
       return username;
   }
   
   public WebElement getPassword() {
       System.out.println(username.getAttribute("data-testid"));
       return password;
   }  }
   
   public class Sample {
       WebDriver driver;
   public Sample(WebDriver driver) {
       PageFactory.initElements(driver, this);
       System.out.println("Page Factory started");
   }
   
   @FindBy(id = "email")
   private WebElement username;
   
   @FindBy(id = "pass")
   private WebElement password;
   
   public WebElement getUsername() {
       System.out.println(username.getAttribute("data-testid"));
       return username;
   }
   
   public WebElement getPassword() {
       System.out.println(username.getAttribute("data-testid"));
       return password;
   }    }