Question

尝试运行以下代码时，我收到Java Null指针异常。在Web页面甚至完全加载之前，测试就失败了。

我增加了页面加载超时和隐式等待时间，但是仍然无法正常工作。通过浏览器直接启动时，同一网页将在4秒内加载。请找到以下代码：

// Loginpagetest.java

Loginpage loginpage = new Loginpage();
public LoginPageTest() throws IOException {
    super();
}

@BeforeMethod
public void setup(){
    initialize();
}

@Test(priority=1)
public void loginPageTitleTest(){
    String actualTitle = loginpage.validateLoginPageTitle();
    String expectedTitle = "#1 Free CRM software in the cloud for sales and service";
    Assert.assertEquals(actualTitle,expectedTitle);
}

// TestBase.java

   public void initialize(){
    String browsername = prop.getProperty("browser");
    if(browsername.equals("chrome")){
        System.setProperty("webdriver.chrome.driver","C:\\Users\\Pranaykumar\\Downloads\\"chromedriver_win32\\chromedriver.exe");
        driver = new ChromeDriver(options);
    }else if(browsername.equals("mozilla")){
        System.setProperty("webdriver.gecko.driver","E:\\geckodriver.exe");
        driver = new FirefoxDriver();
    }

    driver.manage().window().maximize();
    //driver.manage().deleteAllCookies();
    driver.manage().timeouts().pageLoadTimeout(40, TimeUnit.SECONDS);
    driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);

    driver.get(prop.getProperty("url"));
}

// Loginpage.java

    public String validateLoginPageTitle(){
    return driver.getTitle();
        }

//控制台

    [RemoteTestNG] detected TestNG version 6.14.3
    Starting ChromeDriver 2.45.615291 (ec3682e3c9061c10f26ea9e5cdcf3c53f3f74387) on port 42802
    Only local connections are allowed.
    [1548934220.587][WARNING]: Timed out connecting to Chrome, retrying...
    Jan 31, 2019 5:00:25 PM org.openqa.selenium.remote.ProtocolHandshake createSession
    INFO: Detected dialect: OSS
    FAILED: loginPageTitleTest
    java.lang.NullPointerException
at com.crm.qa.pages.Loginpage.validateLoginPageTitle(Loginpage.java:37)
at com.crm.qa.testcases.LoginPageTest.loginPageTitleTest(LoginPageTest.java:30)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)

Answer 1

看起来这不是超时问题，它显示NullPointerException。驱动程序可能为空。检查您的Chrome驱动程序路径是否正确。

‘FAILED：loginPageTitleTest java.lang.NullPointerException com.crm.qa.pages.Loginpage.validateLoginPageTitle（Loginpage.java:37）”

如果出现超时问题，则应该获取TimeoutExcepton。

Answer 2

能否请您尝试在initialize（）函数中以及driver.get(prop.getProperty("url"))行之后显式等待特定对象，如下所示：

WebDriverWait wait = new WebDriverWait(driver, 10);
wait.until(ExpectedConditions.visibilityOfElementLocated(By.id(objectShouldPresent)));

Answer 3

请在chromedriver_win32之前删除双引号（“）

System.setProperty("webdriver.chrome.driver","C:\\Users\\Pranaykumar\\Downloads\\"chromedriver_win32\\chromedriver.exe");

Answer 4

可能的情况是，您正在Loginpage页面对象内创建驱动程序的新实例，而不是传递现有实例，因此该实例不会被初始化...因此是NPE。

页面加载超时在Selenium WebDriver中不起作用

4 个答案: