我遇到了一行代码，可能会触发一些js函数，但是我怎么能解决这个问题呢？
box.setText(link.toString());
client.waitForBackgroundJavaScriptStartingBefore(10000);
box.dblClick(); //this line cause the exception
Exception in thread "main" ======= EXCEPTION START ========
EcmaError: lineNumber=[0] column=[0] lineSource=[function () {] name=[ReferenceError] sourceName=[onclick event for HtmlDivision[<div class="_119 stat_elem focus_target mtm mbl _5bsm _6dh _51z6" id="u_0_k" data-location="maincolumn" onclick="Bootloader.loadComponents("ComposerXControllerBootload", emptyFunction);">] in https://www.facebook.com/?_fb_noscript=1] message=[ReferenceError: "Bootloader" is not defined.]
com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "Bootloader" is not defined.
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:684)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:602)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:616)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:591)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:985)
at com.gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeEventHandler(EventListenersContainer.java:210)
at com.gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:230)
at com.gargoylesoftware.htmlunit.javascript.host.Node.fireEvent(Node.java:804)
at com.gargoylesoftware.htmlunit.javascript.host.Node.fireEvent(Node.java:738)
at com.gargoylesoftware.htmlunit.html.HtmlElement$1.run(HtmlElement.java:869)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:602)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at com.gargoylesoftware.htmlunit.html.HtmlElement.fireEvent(HtmlElement.java:874)
at com.gargoylesoftware.htmlunit.html.HtmlElement.doClickFireClickEvent(HtmlElement.java:1311)
at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1253)
at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1205)
at com.gargoylesoftware.htmlunit.html.HtmlElement.dblClick(HtmlElement.java:1351)
at com.gargoylesoftware.htmlunit.html.HtmlElement.dblClick(HtmlElement.java:1326)
at prototype.Profile.postLinkOnWall(Profile.java:225)
at html.Log.findNext(Log.java:150)
at prototype.Prtp.main(Prtp.java:49)
Caused by: net.sourceforge.htmlunit.corejs.javascript.EcmaError: ReferenceError: "Bootloader" is not defined.
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3603)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3587)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3657)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.nameOrFunction(ScriptRuntime.java:1749)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.name(ScriptRuntime.java:1690)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1622)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:405)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:103)
at com.gargoylesoftware.htmlunit.javascript.host.EventHandler.call(EventHandler.java:81)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:609)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:669)
... 21 more
Enclosed exception:
net.sourceforge.htmlunit.corejs.javascript.EcmaError: ReferenceError: "Bootloader" is not defined.
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3603)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3587)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3657)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.nameOrFunction(ScriptRuntime.java:1749)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.name(ScriptRuntime.java:1690)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1622)
at script.onclick(onclick event for HtmlDivision[<div class="_119 stat_elem focus_target mtm mbl _5bsm _6dh _51z6" id="u_0_k" data-location="maincolumn" onclick="Bootloader.loadComponents("ComposerXControllerBootload", emptyFunction);">] in https://www.facebook.com/?_fb_noscript=1)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:405)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:103)
at com.gargoylesoftware.htmlunit.javascript.host.EventHandler.call(EventHandler.java:81)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:609)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:669)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:602)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:616)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:591)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:985)
at com.gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeEventHandler(EventListenersContainer.java:210)
at com.gargoylesoftware.htmlunit.javascript.host.EventListenersContainer.executeBubblingListeners(EventListenersContainer.java:230)
at com.gargoylesoftware.htmlunit.javascript.host.Node.fireEvent(Node.java:804)
at com.gargoylesoftware.htmlunit.javascript.host.Node.fireEvent(Node.java:738)
at com.gargoylesoftware.htmlunit.html.HtmlElement$1.run(HtmlElement.java:869)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:602)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
at com.gargoylesoftware.htmlunit.html.HtmlElement.fireEvent(HtmlElement.java:874)
at com.gargoylesoftware.htmlunit.html.HtmlElement.doClickFireClickEvent(HtmlElement.java:1311)
at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1253)
at com.gargoylesoftware.htmlunit.html.HtmlElement.click(HtmlElement.java:1205)
at com.gargoylesoftware.htmlunit.html.HtmlElement.dblClick(HtmlElement.java:1351)
at com.gargoylesoftware.htmlunit.html.HtmlElement.dblClick(HtmlElement.java:1326)
at prototype.Profile.postLinkOnWall(Profile.java:225)
at html.Log.findNext(Log.java:150)
at prototype.Prtp.main(Prtp.java:49)
== CALLING JAVASCRIPT ==
function () {
[native code, arity=0]
}
======= EXCEPTION END ========
我写的框在普通的浏览器上运行一个重新格式化的函数，这个函数不是用HtmlUnit执行的，所以我试着用dbclick（）来强制它。
答案 0 :(得分：33)
HtmlUnit与JavaScript不兼容。它经常会引发错误，抱怨未定义的变量或函数。
从这个意义上讲，现实生活浏览器（FireFox，Internet Explorer，Chrome等）更加灵活。这意味着它们将允许语法错误的HTML和JavaScript（例如：不定义函数或不结束HTML标记）。
HtmlUnit希望一切都（几乎）完美。虽然，它会修复一些丢失的结束HTML标记，但一般来说，它希望页面中的代码不包含任何类型的错误。此外，即使一切看起来都正确，HtmlUnit甚至可能会抱怨。
您需要考虑的一些事项是：
BrowserVersions之间切换。您可以在创建WebClient对象时设置它们。事实证明，Internet Explorer（具有讽刺意味的是）在解释JavaScript时可以给我最好的结果当然，如果您可以控制从服务器获取的源代码，那么这些注释将适用。有时，事实并非如此。在这种情况下，你的双手更加紧密。
一种选择是用以下方法来抑制异常：
webClient.getOptions().setThrowExceptionOnScriptError(false);
虽然，这会让你通过异常不会纠正任何JavaScript错误。这意味着如果抛出此异常的JS代码在您的逻辑中恰好是至关重要的，我的意思是，您绝对依赖于该代码的执行结果，那么您就不能让HtmlUnit处理您的JS。如果这恰好是AJAX请求的结果，那么您可以自己手动发出请求，而不是让HtmlUnit这样做。
另一方面，如果给你麻烦的JS代码在你的逻辑中并不重要，我的意思是，它可能只是隐藏一个元素或改变你不关心的颜色，然后抑制异常将是要走的路。
剩下的选项不多。
答案 1 :(得分：9)
尝试设置您的Web客户端不要抛出异常：
client.getOptions().setThrowExceptionOnScriptError(false);
答案 2 :(得分：0)
当我使用方法获得某个网站时，我遇到了同样的问题：
webClient.getPage("http://somepage.com");
如果您不需要使用JavaScript来处理网站，您可以写下：
webClient.getOptions().setJavaScriptEnabled(false);
在我的情况下，它运行良好，脚本立即执行（当我只使用webClient.getOptions().setThrowExceptionOnScriptError(false)时，脚本总是尝试执行错误的JavaScript代码，并在控制台中写出异常消息大约10秒钟，所以我不'建议使用它。）