My Code:- File1.java

public int isListAvailable(String locator) throws Exception {
        WebElement ele = getObject(locator);
        List<WebElement> ls = **(List<WebElement>) ele;**
        //List<WebElement> ls1 = driver.findElements((By) ele);
        //List<WebElement> ls2 = driver.findElements(ele);
        int rowCount = ls.size();
        System.out.println("Last1 row="   rowCount);        
        return rowCount;
    }

    public WebElement getObject(String locatorKey) throws Exception {
            WebElement ele = null;
            WebDriverWait wait = new WebDriverWait(driver, 10);
            try {
                if (locatorKey.endsWith("_xpath")) {
                    ele = driver.findElement(By.xpath(prop.getProperty(locatorKey)));        wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath(prop.getProperty(locatorKey))));
    }

.....
...
....

    }catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
    }
            return ele;
    }

File2.java (catlisting_xpath is XPATH of the elements)

    public void search_List() throws Exception {
            
            if(con.isListAvailable("catlisting_xpath") >=1)
            {
                con.infoLog("Category List is available");
            }else {
                con.infoLog("Category List is not available");
            }
        }

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ERROR:-

java.lang.ClassCastException: class org.openqa.selenium.remote.RemoteWebElement cannot be cast to class java.util.List (org.openqa.selenium.remote.RemoteWebElement is in unnamed module of loader 'app'; java.util.List is in module java.base of loader 'bootstrap')

enter image description here

the issue is, while I run or type this above the File1.java have got a warning at List ls = (List) ele; Warning is Type safety: Unchecked cast from WebElement to List

can anyone help out, how to solve this...

CodePudding user response：

This is surprisingly complicated.

The cast operator ((SomeType) someExpr)) does 3 almost entirely unrelated things. You're confusing a few of them here, I think.

If the SomeType is a primitive numeric type (int, char, double, float, long, byte, or short), then casts convert one thing to another.

But that's where the conversion aspect of casts end. In all other cases you're merely telling the compiler: I know that the expression is of the type I am telling you it is. Sometimes, a runtime check is added (which will throw a ClassCastException if the expression turns out to not be of that type). Sometimes, the compiler just takes your word for it.

The generics part (<WebElement>) - that part is where the compiler will just take your word for it, and that generates that warning.

But that warning is completely irrelevant in this scenario: The problem isn't that part at all. The non-generics part (the List), that gets a runtime check. Because it gets a runtime check, the compiler won't warn: It's fine - if your type assertion turns out to be wrong, at runtime you'll get an exception that'll inform you about this.

So, the warning is about the <WebElement> part, but the error you get at runtime is about the List part.

Your WebElement is not a list. Perhaps you are attempting to create a list containing a single element. In that case, you'd want List.of(ele);. As I said, type-assertion mode casts do not convert anything, so you can't use it to convert an element to a list of just that element.

CodePudding user response：

WebElement ele = getObject(locator);
List<WebElement> ls = (List<WebElement>) ele;

You are casting List to WebElement and that is not valid. I believe in your getObject method you are using findElement method to identify the locator. Instead of that use findElements method to get List of WebElement

Try like below,

List<WebElement> ls = driver.findElements(By.xpath(locator));