976145 - Impossible to tell which element is Stale when chaining find_element.

Status: RESOLVED INCOMPLETE

(Remote Protocol :: Marionette, defect)

Description

[Zac C (:zac)]

If find_element('id', 'foo').find_element('id', 'bar') raises a StaleElementReferenceException 

The failure message is:
StaleElementException: StaleElementException: Stale element reference

which is the same thing 3 times over.

It's impossible to tell which element was stale.

Comment 1

[Zac C (:zac)]

Entire trace, for your curiosity:

test_clock_create_new_alarm (test_clock_create_new_alarm.TestClockCreateNewAlarm)

Add an alarm and set label of the new alarm ... ERROR

======================================================================

ERROR: None

----------------------------------------------------------------------

Traceback (most recent call last):

File "/home/travis/build/mozilla-b2g/gaia/travis_venv/local/lib/python2.7/site-packages/marionette_client-0.7.3-py2.7.egg/marionette/marionette_test.py", line 143, in run

testMethod()

File "/home/travis/build/mozilla-b2g/gaia/tests/python/gaia-ui-tests/gaiatest/tests/functional/clock/test_clock_create_new_alarm.py", line 69, in test_clock_create_new_alarm

self.clock.alarms[0].wait_for_checkbox_to_change_state(False)

File "/home/travis/build/mozilla-b2g/gaia/tests/python/gaia-ui-tests/gaiatest/apps/clock/app.py", line 101, in wait_for_checkbox_to_change_state

self.wait_for_condition(lambda m: self.is_alarm_active == value)

File "/home/travis/build/mozilla-b2g/gaia/tests/python/gaia-ui-tests/gaiatest/apps/base.py", line 50, in wait_for_condition

Wait(self.marionette, timeout).until(method, message=message)

File "/home/travis/build/mozilla-b2g/gaia/travis_venv/local/lib/python2.7/site-packages/marionette_client-0.7.3-py2.7.egg/marionette/wait.py", line 122, in until

rv = condition(self.marionette)

File "/home/travis/build/mozilla-b2g/gaia/tests/python/gaia-ui-tests/gaiatest/apps/clock/app.py", line 101, in <lambda>

self.wait_for_condition(lambda m: self.is_alarm_active == value)

File "/home/travis/build/mozilla-b2g/gaia/tests/python/gaia-ui-tests/gaiatest/apps/clock/app.py", line 95, in is_alarm_active

return self.root_element.find_element(*self._check_box_locator).is_selected()

File "/home/travis/build/mozilla-b2g/gaia/travis_venv/local/lib/python2.7/site-packages/marionette_client-0.7.3-py2.7.egg/marionette/marionette.py", line 121, in is_selected

return self.marionette._send_message('isElementSelected', 'value', id=self.id)

File "/home/travis/build/mozilla-b2g/gaia/travis_venv/local/lib/python2.7/site-packages/marionette_client-0.7.3-py2.7.egg/marionette/marionette.py", line 605, in _send_message

self._handle_error(response)

File "/home/travis/build/mozilla-b2g/gaia/travis_venv/local/lib/python2.7/site-packages/marionette_client-0.7.3-py2.7.egg/marionette/marionette.py", line 630, in _handle_error

raise StaleElementException(message=message, status=status, stacktrace=stacktrace)

StaleElementException: StaleElementException: Stale element reference

TEST-UNEXPECTED-FAIL | test_clock_create_new_alarm.py test_clock_create_new_alarm.TestClockCreateNewAlarm.test_clock_create_new_alarm |

----------------------------------------------------------------------

Ran 1 test in 26.970s

Comment 2

[David Burns :automatedtester]

Currently WebDriver doesnt do this either. 

see 

(selenium)☁  javascript [master] python
Python 2.7.2 (default, Oct 11 2012, 20:14:37)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from selenium import webdriver
f>>> f=webdriver.Firefox()
>>> f.get('http://google.com')
>>> q = f.find_element('name', 'q')
>>> f.refresh()
>>> q.send_keys('foo')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/dburns/.virtualenvs/selenium/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py", line 292, in send_keys
    self._execute(Command.SEND_KEYS_TO_ELEMENT, {'value': typing})
  File "/Users/dburns/.virtualenvs/selenium/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py", line 369, in _execute
    return self._parent.execute(command, params)
  File "/Users/dburns/.virtualenvs/selenium/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 164, in execute
    self.error_handler.check_response(response)
  File "/Users/dburns/.virtualenvs/selenium/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 164, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: u'Element not found in the cache - perhaps the page has changed since it was looked up' ; Stacktrace:
    at fxdriver.cache.getElementAt (resource://fxdriver/modules/web_element_cache.js:7584)
    at Utils.getElementAt (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:7197)
    at fxdriver.preconditions.visible (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:8177)
    at DelayedCommand.prototype.checkPreconditions_ (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10814)
    at DelayedCommand.prototype.executeInternal_/h (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10831)
    at DelayedCommand.prototype.executeInternal_ (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10836)
    at DelayedCommand.prototype.execute/< (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10778)
>>>

Comment 3

[David Burns :automatedtester]

raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: u'Element not found in the cache - perhaps the page has changed since it was looked up' ; Stacktrace:
    at fxdriver.cache.getElementAt (resource://fxdriver/modules/web_element_cache.js:7584)
    at Utils.getElementAt (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:7197)
    at fxdriver.preconditions.visible (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:8177)
    at DelayedCommand.prototype.checkPreconditions_ (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10814)
    at DelayedCommand.prototype.executeInternal_/h (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10831)
    at DelayedCommand.prototype.executeInternal_ (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10836)
    at DelayedCommand.prototype.execute/< (file:///var/folders/8m/mhq2tccd2g3c850hwmbbbkt00000gn/T/tmpnrGkfM/extensions/[e-mail]/components/command_processor.js:10778)


Is the interesting part

Comment 4

[David Burns :automatedtester]

https://code.google.com/p/selenium/issues/detail?id=7144 raised

Comment 5

[David Burns :automatedtester]

[Mass closure] Closing as these features are no longer needed or wanted