Fix random failure on ITIntWidgetTest

21:01:32,229 INFO  [AbstractTest] Starting test 'org.nuxeo.ftest.formsLayoutDemo.ITIntWidgetTest#testWidget'
21:01:36,199 ERROR [AbstractTest] Test 'org.nuxeo.ftest.formsLayoutDemo.ITIntWidgetTest#testWidget' failed
org.openqa.selenium.StaleElementReferenceException: Element is no longer attached to the DOM
Command duration or timeout: 48 milliseconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.39.0', revision: 'ff23eac', time: '2013-12-16 16:11:15'
System info: host: 'ip-172-30-2-246', ip: '172.30.2.246', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-68-generic', java.version: '1.8.0_60'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=26.0, platform=LINUX, browserConnectionEnabled=true, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: fd741631-413d-49b9-bdf0-6af20a4d1ede
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
	at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
	at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
	at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:268)
	at org.openqa.selenium.remote.RemoteWebElement.click(RemoteWebElement.java:79)
	at org.nuxeo.ftest.formsLayoutDemo.AbstractWidgetPageTest.doSubmitDemo(AbstractWidgetPageTest.java:102)
	at org.nuxeo.ftest.formsLayoutDemo.AbstractWidgetPageTest.submitDemo(AbstractWidgetPageTest.java:97)
	at org.nuxeo.ftest.formsLayoutDemo.ITIntWidgetTest.testWidget(ITIntWidgetTest.java:45)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.nuxeo.functionaltests.LogTestWatchman$1.evaluate(LogTestWatchman.java:94)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runners.Suite.runChild(Suite.java:127)
	at org.junit.runners.Suite.runChild(Suite.java:26)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:138)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.createRequestAndRun(JUnitCoreWrapper.java:113)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.executeEager(JUnitCoreWrapper.java:85)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:54)
	at org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:134)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
Caused by: org.openqa.selenium.remote.ErrorHandler$UnknownServerException: Element is no longer attached to the DOM
Build info: version: '2.39.0', revision: 'ff23eac', time: '2013-12-16 16:11:15'
System info: host: 'ip-172-30-2-246', ip: '172.30.2.246', os.name: 'Linux', os.arch: 'amd64', os.version: '3.13.0-68-generic', java.version: '1.8.0_60'
Driver info: driver.version: unknown
	at <anonymous class&gt;.fxdriver.cache.getElementAt(resource://fxdriver/modules/web_element_cache.js:7587)
	at <anonymous class&gt;.Utils.getElementAt(file:///tmp/anonymous7607277947386168084webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:7197)
	at <anonymous class&gt;.fxdriver.preconditions.visible(file:///tmp/anonymous7607277947386168084webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:8177)
	at <anonymous class&gt;.DelayedCommand.prototype.checkPreconditions_(file:///tmp/anonymous7607277947386168084webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10814)
	at <anonymous class&gt;.DelayedCommand.prototype.executeInternal_/h(file:///tmp/anonymous7607277947386168084webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10831)
	at <anonymous class&gt;.DelayedCommand.prototype.executeInternal_(file:///tmp/anonymous7607277947386168084webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10836)
	at <anonymous class&gt;.DelayedCommand.prototype.execute/<(file:///tmp/anonymous7607277947386168084webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10778)
21:01:36,204 INFO  [AbstractTest] Created screenshot file named '/opt/jenkins/workspace/addons_FT_nuxeo-platform-forms-layout-demo-7.10-webdriver/ftest/webdriver/target/screenshot-lastpage-org.nuxeo.ftest.formsLayoutDemo.ITIntWidgetTest-testWidget6786272476003853094.png'
21:01:36,204 INFO  [AbstractTest] Created page source file named '/opt/jenkins/workspace/addons_FT_nuxeo-platform-forms-layout-demo-7.10-webdriver/ftest/webdriver/target/screenshot-lastpage-org.nuxeo.ftest.formsLayoutDemo.ITIntWidgetTest-testWidget4938813374409124442.html'
21:01:36,204 INFO  [AbstractTest] Finished test 'org.nuxeo.ftest.formsLayoutDemo.ITIntWidgetTest#testWidget'