Java HTMLUnit WebClient ScriptException 错误

Question

我正在使用 HTMLUnit 来抓取网站。我正在使用 htmlunit-2.19 版本。我知道这是重复的问题，但相信我，我尝试了在谷歌中找到的所有解决方案，但我仍然遇到了这个异常(exception)。请参阅下面的异常

com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "jQuery" is not defined. (URL/lib/dropdown/core.js#3)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:954) [htmlunit-2.19.jar:2.19]
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628) [htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513) [htmlunit-core-js-2.17.jar:na]
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:836) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:812) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HtmlPage.loadExternalJavaScriptFile(HtmlPage.java:997) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:399) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:277) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:293) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:799) [htmlunit-2.19.jar:2.19]
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) [xercesImpl-2.11.0.jar:na]
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:756) [htmlunit-2.19.jar:2.19]
    at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170) [nekohtml-1.9.22.jar:1.9.22]
    at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072) [nekohtml-1.9.22.jar:1.9.22]
    at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206) [nekohtml-1.9.22.jar:na]
    at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330) [nekohtml-1.9.22.jar:na]
    at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3126) [nekohtml-1.9.22.jar:1.9.22]
    at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2093) [nekohtml-1.9.22.jar:1.9.22]
    at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:920) [nekohtml-1.9.22.jar:1.9.22]
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499) [nekohtml-1.9.22.jar:1.9.22]
    at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452) [nekohtml-1.9.22.jar:1.9.22]
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) [xercesImpl-2.11.0.jar:na]
    at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:1039) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:252) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:198) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:271) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:159) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:478) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:352) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:417) [htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:402) [htmlunit-2.19.jar:2.19]
    at com.company.dashboard.service.impl.ReverseServiceImpl.loginToAds(ReverseServiceImpl.java:447) [classes/:na]
    at com.company.dashboard.service.impl.ReverseServiceImpl.loginToAds(ReverseServiceImpl.java:462) [classes/:na]
    at com.company.dashboard.service.impl.ReverseServiceImpl.getKeyword(ReverseServiceImpl.java:502) [classes/:na]
    at com.company.dashboard.service.impl.ReverseServiceImpl.handleReverseBySetting(ReverseServiceImpl.java:879) [classes/:na]
    at com.company.dashboard.thread.ConCurrentRunnable.run(ConCurrentRunnable.java:44) [classes/:na]
    at com.company.dashboard.thread.CustomThreadPool$WorkerThread.run(CustomThreadPool.java:53) [classes/:na]
Caused by: net.sourceforge.htmlunit.corejs.javascript.EcmaError: ReferenceError: "jQuery" is not defined. (URL/lib/dropdown/core.js#3)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3935) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3919) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3996) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.name(ScriptRuntime.java:1846) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1627) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:411) [htmlunit-core-js-2.17.jar:na]
    at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309) ~[htmlunit-2.19.jar:2.19]
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3286) ~[htmlunit-core-js-2.17.jar:na]
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115) ~[htmlunit-core-js-2.17.jar:na]
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:827) ~[htmlunit-2.19.jar:2.19]
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:939) [htmlunit-2.19.jar:2.19]
    ... 36 common frames omitted

2019-07-13 11:06:01.078  INFO 5686 --- [       Thread-4] c.g.h.javascript.JavaScriptEngine        : Caught script exception

我在谷歌上进行了研究，找到了许多关于此异常的解决方案，并且我尝试了所有解决方案，但没有一个解决方案有效。

请参阅以下我已应用的解决方案

解决方案1

WebClient webClient= new WebClient(BrowserVersion.FIREFOX_38);

        webClient.setIncorrectnessListener(new IncorrectnessListener() {

            @Override
            public void notify(String message, Object origin) {
                // TODO Auto-generated method stub

            }

        });
        webClient.setCssErrorHandler(new SilentCssErrorHandler() {

        });
        webClient.setJavaScriptErrorListener(new JavaScriptErrorListener() {

            @Override
            public void scriptException(InteractivePage page,
                    ScriptException scriptException) {
                // TODO Auto-generated method stub

            }

            @Override
            public void timeoutError(InteractivePage page, long allowedTime,
                    long executionTime) {
                // TODO Auto-generated method stub

            }

            @Override
            public void malformedScriptURL(InteractivePage page, String url,
                    MalformedURLException malformedURLException) {
                // TODO Auto-generated method stub

            }

            @Override
            public void loadScriptError(InteractivePage page, URL scriptUrl,
                    Exception exception) {
                // TODO Auto-generated method stub

            }

        });
        webClient.setHTMLParserListener(new HTMLParserListener() {

            @Override
            public void error(String message, URL url, String html, int line,
                    int column, String key) {
                // TODO Auto-generated method stub

            }

            @Override
            public void warning(String message, URL url, String html, int line,
                    int column, String key) {
                // TODO Auto-generated method stub

            }

        });

解决方案2:

   webClient.getOptions().setCssEnabled(false);
   webClient.getOptions().setJavaScriptEnabled(true);
   webClient.getOptions().setThrowExceptionOnScriptError(false);            
   webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);      
   webClient.getOptions().setPrintContentOnFailingStatusCode(false);

我找到了其他setJavaScriptEnabled(false)的解决方案，但我需要启用JS。如果没有启用 JS 我无法抓取网站。所以我必须设置启用JS。

请告诉我我的代码中是否缺少内容？

Answer 1

在不知道页面和有关您的代码的更多详细信息的情况下，我只能尝试提供一些建议

• 您的 HtmlUnit 版本确实已经过时(2.19 是从 2015 年 11 月 12 日开始)，我们现在是 2.35.0。请使用最新的......
• 检查真实浏览器的浏览器日志，看看是否也存在错误
• webClient.getOptions().setThrowExceptionOnScriptError(false);更改 HtmlUnit 的行为，以便在检测到未处理的 js 异常时不抛出异常。这或多或少与真实浏览器处理js异常的方式相同。但是(与真实浏览器相比)HtmlUnit 仍然记录此异常。如果您不想了解此问题，则必须配置记录器。