尝试访问列表中的元素时获取java.lang.ClassCastException

Question

样例代码：

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A类页面上创建Webelements列表，而在BI类中试图单击第一个元素。

在执行时，我得到以下异常：

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

问题与findElements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，代码可以正常工作。

在下面的示例中，我注释了findElements行，而手动添加了元素，此代码运行良好。

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);
    }
}

谁能建议出什么问题了？

Answer 1

我尝试了如下的XPATH：

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编写测试？

在该行中：

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

观察到xpath span[2]""的末尾出现了额外的双引号。 检查是否是错误原因。

如果进行递归调用，则会发生java.lang.StackOverflowError。 请检查您的代码是否正在进行递归。

java.lang.ClassCastException：无法将java.lang.StackOverflowError强制转换为java.lang.Exception

在catch块中，您使用了Exception ，但是代码抛出了StackOverflowError ，这是一个Error（但不是Exception）

仔细检查代码，以了解递归发生的位置。

Answer 2

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，其中未正确实现findElements方法，而未正确实现findElement方法。 因此，仅对于driver.findElements方法出现了问题，而driver.findElement方法运行正常。

谢谢大家的帮助！！！