[HtmlUnit] [htmlunit:bugs] #2021 ClassCastException when calling webClient.getPage()

[RBRi <rb...@us...>]

- **status**: open --> closed
- **assigned_to**: RBRi



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** [bugs:#2021] ClassCastException when calling webClient.getPage()**

**Status:** closed
**Group:** 2.21
**Created:** Fri Aug 16, 2019 07:01 AM UTC by Summer Guo
**Last Updated:** Fri Nov 01, 2019 01:46 PM UTC
**Owner:** RBRi


Im using 2.20 
ClassCastException when calling webClient.getPage()
this bug only happens when JS is enabled
FYI: the url im trying to test is: https://steamcommunity.com/openid/login

Thanks in advance!

Caused by: com.gargoylesoftware.htmlunit.ScriptException: Exception invoking observe
        at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:883)
        at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:613)
        at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:539)
        at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:815)
        at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:787)
        at com.gargoylesoftware.htmlunit.InteractivePage.executeJavaScriptFunctionIfPossible(InteractivePage.java:216)
        at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeEventListeners(EventListenersContainer.java:258)
        at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:322)
        at com.gargoylesoftware.htmlunit.javascript.host.event.EventTarget.fireEvent(EventTarget.java:192)
        at com.gargoylesoftware.htmlunit.html.DomElement$2.run(DomElement.java:1167)
        at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:613)
        at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:539)
        at com.gargoylesoftware.htmlunit.html.DomElement.fireEvent(DomElement.java:1172)
        at com.gargoylesoftware.htmlunit.html.HtmlPage.executeEventHandlersIfNeeded(HtmlPage.java:1223)
        at com.gargoylesoftware.htmlunit.html.HtmlPage.initialize(HtmlPage.java:254)
        at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:484)
        at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:351)
        at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:416)
        at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:401)
        at com.amazon.agssocial.internal.identity.service.helpers.SteamOpenIdHelper.sendAuthRequest(AuthHelper.java:58)
        at com.amazon.agssocial.internal.identity.service.BaseTest.testGetCredentialsForOauthAccount(BaseTest.java:324)
        ... 15 more
Caused by: java.lang.RuntimeException: Exception invoking observe
        at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:193)
        at net.sourceforge.htmlunit.corejs.javascript.FunctionObject.call(FunctionObject.java:453)
        at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1479)
        at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:815)
        at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:111)
        at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:429)
        at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:252)
        at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3345)
        at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:808)
        at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:868)
        ... 35 more
Caused by: java.lang.ClassCastException: com.gargoylesoftware.htmlunit.html.HtmlPage cannot be cast to com.gargoylesoftware.htmlunit.html.HtmlElement
        at com.gargoylesoftware.htmlunit.javascript.host.dom.MutationObserver.observe(MutationObserver.java:85)
        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:498)
        at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:167)
        ... 44 more


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