创建新对象行时出现 java.lang.NullPointerException

Question

我正在尝试使用 TestNG 和页面对象进行我的 Selenium 测试。但在我创建页面对象类的新对象的那一行，它因 java.lang.NullPointerException 错误而失败。

public class TestTitle {

    @Test
    public void scenario1() {

        System.setProperty("webdriver.chrome.driver", "chromedriver.exe");
        WebDriver driver=new ChromeDriver();
        FirstPage fp = new FirstPage(driver);
        driver.get("https://www.google.com/");
        fp.element.click();
    }
}


public class FirstPage {

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

    public WebElement element = driver.findElement(By.id("hptl"));

}




FAILED: scenario1
java.lang.NullPointerException
at Pages.FirstPage.<init>(FirstPage.java:14)
at Test.TestTitle.scenario1(TestTitle.java:15)

FirstPage.java:14 是 public WebElement element = driver.findElement(By.id("hptl")); TestTitle.java:15 是 FirstPage fp = new FirstPage(driver);

Answer 1

试试这个

public class FirstPage {

    public WebDriver driver;
    public WebElement element;

    public FirstPage (WebDriver driver) {
        this.driver = driver;
        this.element = driver.findElement(By.id("hptl"));
    }

}