Can anyone explain why I get random exceptions like the one below? They are random in the sense that I can run my test, get an exception like below, run it again, and get no exception, without changing *anything*. It happens often enough to be a concern about whether or not I can continue to base an entire framework around WebTest if tests will frequently need to be rerun, and when users besides myself will run it and be confronted with spurious errors...
ANY help appreciated. Thanks Mike [webtest] INFO (com.canoo.webtest.steps.Step) - Exception thrown from this class: org.apache.xerces.xni.XNIException [webtest] ERROR (com.canoo.webtest.steps.Step) - Original cause of the XNIException: null [webtest] java.util.ConcurrentModificationException [webtest] at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782) [webtest] at java.util.HashMap$ValueIterator.next(HashMap.java:812) [webtest] at com.gargoylesoftware.htmlunit.ThreadManager.interruptAll(ThreadManager.java:170) [webtest] at com.gargoylesoftware.htmlunit.WebWindowImpl.destroyChildren(WebWindowImpl.java:133) [webtest] at com.gargoylesoftware.htmlunit.WebWindowImpl.setEnclosedPage(WebWindowImpl.java:96) [webtest] at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.startDocument(HTMLParser.java:332) [webtest] at org.apache.xerces.parsers.AbstractSAXParser.startDocument(Unknown Source) [webtest] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [webtest] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [webtest] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [webtest] at java.lang.reflect.Method.invoke(Method.java:324) [webtest] at org.cyberneko.html.filters.DefaultFilter.startDocument(DefaultFilter.java:102) [webtest] at org.cyberneko.html.filters.NamespaceBinder.startDocument(NamespaceBinder.java:247) [webtest] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [webtest] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [webtest] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [webtest] at java.lang.reflect.Method.invoke(Method.java:324) [webtest] at org.cyberneko.html.HTMLTagBalancer.startDocument(HTMLTagBalancer.java:380) [webtest] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [webtest] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [webtest] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [webtest] at java.lang.reflect.Method.invoke(Method.java:324) [webtest] at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:1915) [webtest] at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:809) [webtest] at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:478) [webtest] at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:431) [webtest] at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) [webtest] at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:311) [webtest] at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:226) [webtest] at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:116) [webtest] at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:84) [webtest] at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:426) [webtest] at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:344) [webtest] at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:371) [webtest] at com.gargoylesoftware.htmlunit.html.HtmlForm.submit(HtmlForm.java:217) [webtest] at com.gargoylesoftware.htmlunit.html.HtmlImageInput.doClickAction(HtmlImageInput.java:133) [webtest] at com.gargoylesoftware.htmlunit.html.ClickableElement.click(ClickableElement.java:120) [webtest] at com.gargoylesoftware.htmlunit.html.HtmlImageInput.click(HtmlImageInput.java:156) [webtest] at com.gargoylesoftware.htmlunit.html.HtmlImageInput.click(HtmlImageInput.java:117) [webtest] at com.canoo.webtest.steps.request.ClickButton.findTarget(ClickButton.java:139) [webtest] at com.canoo.webtest.steps.request.AbstractTargetAction$1.call(AbstractTargetAction.java:108) [webtest] at com.canoo.webtest.steps.request.TargetHelper.protectedGoto(TargetHelper.java:86) [webtest] at com.canoo.webtest.steps.request.AbstractTargetAction.gotoTarget(AbstractTargetAction.java:106) [webtest] at com.canoo.webtest.steps.request.AbstractTargetAction.doExecute(AbstractTargetAction.java:78) [webtest] at com.canoo.webtest.steps.Step.execute(Step.java:154) [webtest] at com.canoo.webtest.engine.Engine.executeSteps(Engine.java:28) [webtest] at com.canoo.webtest.ant.WebtestTask.execute(WebtestTask.java:79) [webtest] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) [webtest] at org.apache.tools.ant.Task.perform(Task.java:364) [webtest] at org.apache.tools.ant.Target.execute(Target.java:341) [webtest] at org.apache.tools.ant.Target.performTasks(Target.java:369) [webtest] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216) [webtest] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37) [webtest] at org.apache.tools.ant.Project.executeTargets(Project.java:1068) [webtest] at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382) [webtest] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) [webtest] at org.apache.tools.ant.Task.perform(Task.java:364) [webtest] at org.apache.tools.ant.Target.execute(Target.java:341) [webtest] at org.apache.tools.ant.Target.performTasks(Target.java:369) [webtest] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216) [webtest] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37) [webtest] at org.apache.tools.ant.Project.executeTargets(Project.java:1068) [webtest] at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382) [webtest] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) [webtest] at org.apache.tools.ant.Task.perform(Task.java:364) [webtest] at org.apache.tools.ant.Target.execute(Target.java:341) [webtest] at org.apache.tools.ant.Target.performTasks(Target.java:369) [webtest] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216) [webtest] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37) [webtest] at org.apache.tools.ant.Project.executeTargets(Project.java:1068) [webtest] at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382) [webtest] at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:107) [webtest] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) [webtest] at org.apache.tools.ant.Task.perform(Task.java:364) [webtest] at org.apache.tools.ant.Target.execute(Target.java:341) [webtest] at org.apache.tools.ant.Target.performTasks(Target.java:369) [webtest] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216) [webtest] at org.apache.tools.ant.Project.executeTarget(Project.java:1185) [webtest] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40) [webtest] at org.apache.tools.ant.Project.executeTargets(Project.java:1068) [webtest] at org.apache.tools.ant.Main.runBuild(Main.java:668) [webtest] at org.apache.tools.ant.Main.startAnt(Main.java:187) [webtest] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246) [webtest] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
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