获取java。尝试访问列表中的元素时出现lang.ClassCastException

Question

示例代码：

public class A
{
    List<WebElement> itemList = new ArrayList<WebElement>();
    public List<WebElement> getItemsList()
    {
        itemList = (driver.findElements(By.xpath("<some valid xpath>")));
        return(itemList);
    }
}

public class B
{
    A hp = new A();
    public void subscribe()
    {   
        hp.getItemsList().get(0).click();
    }
}

我正在类A中的页面上创建WebElement列表，在类B中，我试图单击第一个元素。

在执行时，我得到以下例外：

> java.lang.ClassCastException: java.lang.StackOverflowError cannot be cast to java.lang.Exception

问题与findElement有关，因为当我在代码中手动使用findElement方法将元素添加到列表中时，代码运行良好。

在下面的示例中，我对findElements行进行了注释，并手动添加了元素，这段代码运行良好。

public class A
{
    List<WebElement> itemList = new ArrayList<WebElement>();

    public List<WebElement> getItemsList()
    {
        //itemList = (driver.findElements(By.xpath(".//*[@id='hc6|stocks|item1']/span[2]"")));
        itemList.add(driver.findElement(By.xpath(".//*[@id='hc6|stocks|item1']/span[2]")));
        itemList.add(driver.findElement(By.xpath(".//*[@id='hc6|stocks|item2']/span[2]")));
        itemList.add(driver.findElement(By.xpath(".//*[@id='hc6|stocks|item3']/span[2]")));
        return(itemList);
    }
}

有人能告诉我出了什么问题吗？

Answer 1

问题不在代码中。问题在框架中。

在框架工作中，我们有一个驱动程序类，其中findElements方法没有正确实现，而findElement方法被正确实现。因此，问题只出现在driver.findElements方法和driver.findElement方法工作正常。

谢谢大家的帮助！！！！

Answer 2

我尝试了XPATH如下：

List<WebElement> itemList = driver.findElements(By.xpath(".//*[@class='itemrow button']/span[2]"));  // .//*[@class='itemrow button']/span[2]
    System.out.println("list " + itemList);

返回以下元素：

list [[[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]], [[ChromeDriver: chrome on XP (a92615f2a2338af92c3dc57ff2366bf8)] -> xpath: .//*[@class='itemrow button']/span[2]]]

我希望XPATH或findElements方法没有问题。您是否使用任何框架来编写测试？

在该行中：

 //itemList = (driver.findElements(By.xpath(".//*[@id='hc6|stocks|item1']/span[2]"")));

观察到xpathwide[2]"末尾存在额外的双引号。检查它是否是错误的原因。

Java语言如果进行递归调用，则会发生lang.StackOverflowerError。请检查您的代码是否正在发生递归。

java.lang.ClassCastException：java.lang.StackOverflow Error不能强制转换为java.lang.异常

在catch块中，您使用了Exception，但代码抛出了StackOverflow Error，这是一个错误（但不是异常）

彻底检查代码，找出递归发生的位置。