I am very sure most of you might face a question like “what are the various exceptions you have faced using selenium
and how to resolve this”?
so in this article, we will look into
various exceptions that we will face while working with selenium and also
discuss the possible solution to overcome this.
But Before that,
What is Exception?
Exceptions are an abnormal event that
occurs during the execution of program/automation scripts due to which the normal flow of program/scripts will get disrupted.
Technically It is an object which is thrown
at runtime and could be handled by using Try/catch block.
Now let's look into some of the most common
selenium exceptions that probably you might have faced while working with
selenium
WebDriverException
WebDriver Exception comes when we try to
perform any action on the non-existing driver.
WebDriver driver = new
InternetExplorerDriver();
driver.get("http://google.com");
driver.close();
driver.quit();
NoAlertPresentException
When we try to perform an action i.e.,
either accept() or dismiss() which is not required at a required place it gives
us this exception.
try{
driver.switchTo().alert().accept();
}
catch (NoAlertPresentException E)
{
E.printStackTrace();
}
NoSuchWindowException
When we try to switch to an window which is
not present it will throws us this exception:
WebDriver driver = new
InternetExplorerDriver();
driver.get("http://google.com");
driver.switchTo().window("Yup_Fail");
driver.close();
In the above snippet, line 3 throws us an
exception, as we are trying to switch to a window that is not present.
NoSuchFrameException
Similar to NoSuchWindowException exception,
Frame exception mainly comes during switching between the frames.
WebDriver driver = new
InternetExplorerDriver();
driver.get("http://google.com");
driver.switchTo().frame("F_fail");
driver.close();
In the above snippet, line 3 throws us an
exception, as we are trying to switch to a frame that is not present.
NoSuchElementException
This exception is thrown when we WebDriver
doesn’t find the web-element in the DOM.
WebDriver driver = new
InternetExplorerDriver();
driver.get("http://google.com");
driver.findElement(By.name("fake")).click();
TimeoutException
Thrown when a command does not complete in
enough time.
NoSuchElementException
This exception is thrown when an element
could not be found.
If you encounter this exception, you may
want to check the following:
* Check
your selector used in your find by...
* Element may
not yet be on the screen at the time of the find operation, (webpage is still
loading).
ElementNotVisibleException
This exception is thrown when an element is
present in the DOM, but it is not visible, and so is not able to be interacted
with.
To handle this exception, we can use
explicit wait or try to find out the element by JavaScript.
StaleElementReferenceException
This exception is thrown when the element
no longer appears on the DOM of the page.
Possible causes of
StaleElementReferenceException include, but not limited to:
* You are no longer on the same page, or the page may have
refreshed since the element was located.
* The element
may have been removed and re-added to the screen since it was located. Such as
an element being relocated.
This can
happen typically with a javascript framework when values are updated, and the
node is rebuilt.
* Element may
have been inside an iframe or another context which was refreshed.
SessionNotCreatedException
This exception is thrown when a new session
could not be created.
