RemoteWebDriver.findElement() returns null

[kool79]

Selenium Version: v 3.8.1 (java bindings)

I use RemoteWebDriver (connected to chomedriver) which is wrapped by EventFiringWebDriver.

My stacktrace shows NPE with stacktrace

Caused by: java.lang.NullPointerException:
	at org.openqa.selenium.support.events.EventFiringWebDriver.extractInterfaces(EventFiringWebDriver.java:124)
	at org.openqa.selenium.support.events.EventFiringWebDriver.access$500(EventFiringWebDriver.java:69)
	at org.openqa.selenium.support.events.EventFiringWebDriver$EventFiringWebElement.<init>(EventFiringWebDriver.java:368)
	at org.openqa.selenium.support.events.EventFiringWebDriver$EventFiringWebElement.<init>(EventFiringWebDriver.java:360)
	at org.openqa.selenium.support.events.EventFiringWebDriver.createWebElement(EventFiringWebDriver.java:311)
	at org.openqa.selenium.support.events.EventFiringWebDriver.findElement(EventFiringWebDriver.java:194)
.....

NPE was caused by line

extractInterfaces(allInterfaces, object.getClass());

in EventFiringWebDriver.extractInterfaces(). When I analyzed chain of calls I found that object should be the WebElement which is returned by

 WebElement temp = driver.findElement(by);

by EventFiringWebDriver.findElement(). Here driver is instance of RemoteWebDriver.

I know that actually it is chromedriver issue. But there are very similar issues here (for findElements() ) which were fixed at client side, see #4555 and #4375.

Extra info:
In my case I tried to wait until element in another window will dissapear (by scenario window should be closed after click 'pay' button) So I expected that findElement will throw StaleElementException, ElementNotFoundException or NoSuchWindowException but I got NPE instead.
Subsequent call to webdriver returned:
org.openqa.selenium.NoSuchWindowException: no such window: target window already closed from unknown error: web view not found (Session info: chrome=63.0.3239.108) (Driver info: chromedriver=2.34.522940 (1a76f96f66e3ca7b8e57d503b4dd3bccfba87af1),platform=Windows NT 6.1.7601 SP1 x86_64) ....

[barancev]

For issues please provide a concise reproducible test case and describe what results you are seeing and what results you expect.

See CONTRIBUTING.md

[barancev]

Also retest in the latest version (that is 3.11 at the moment)

[kool79]

Retested on 3.11 - have the same issue

I cannot give you reproducible testcase which works well because issue occurred rarely (I have 2 fails in the same place in code for > 200 executions of data-driven test)

Can we have some workaround for this? Like you did for findElements in 4a3ec2d when fixing #4555. For example, throw NotFoundException or some other exception when remote driver returns null for findElement ?

[Karengrigoryan060]

Hi all.
Can someone help to find workaround for this?