【发布时间】：2020-02-24 08:39:25
【问题描述】：
我正在使用 htmlunit 2.35.0 版本以无头模式运行 html。它适用于包含 SVG 的 html。现在，我正在使用一个名为 geotoolkit 的自定义 JavaScript 框架来呈现画布图像。当我尝试使用 htmlunit 以无头模式运行带有画布的 html 时，我遇到了问题。请找到以下代码和错误日志。谁能告诉我如何解决这个问题？
代码
import java.io.File;
import java.nio.file.Paths;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlPage;
String path = Paths.get("Input/Editor").toAbsolutePath()+File.separator+"canvas.html";
WebClient webClient = new WebClient();
File file = new File(path);
HtmlPage page = webClient.getPage(file.toURI().toURL().toString());
webClient.getOptions().setJavaScriptEnabled(true);
webClient.waitForBackgroundJavaScript(10000);
System.out.println(page.asXml());
webClient.close();
错误日志
Feb 24, 2020 11:22:29 AM com.gargoylesoftware.htmlunit.javascript.host.canvas.CanvasRenderingContext2D createImageData
INFO: CanvasRenderingContext2D.createImageData() not yet implemented
Feb 24, 2020 11:22:29 AM com.gargoylesoftware.htmlunit.javascript.DefaultJavaScriptErrorListener scriptException
SEVERE: Error during JavaScript execution
======= EXCEPTION START ========
EcmaError: lineNumber=[1426] column=[0] lineSource=[null] name=[TypeError] sourceName=[file:/D:/Playground/HeadlessTest/Input/BHAEditor/geotoolkit/geotoolkit.adv.js] message=[TypeError: Cannot read property "width" from undefined (file:/D:/Playground/HeadlessTest/Input/BHAEditor/geotoolkit/geotoolkit.adv.js#1426)]
com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot read property "width" from undefined (file:/D:/Playground/HeadlessTest/Input/BHAEditor/geotoolkit/geotoolkit.adv.js#1426)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:885)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:617)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:534)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:336)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:814)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:786)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2534)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2527)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeEventListeners(EventListenersContainer.java:342)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeAtTargetListeners(EventListenersContainer.java:379)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventTarget.executeEventLocally(EventTarget.java:100)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeEvent(HtmlScript.java:414)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:380)
at com.gargoylesoftware.htmlunit.html.HtmlScript$2.execute(HtmlScript.java:247)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:936)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.access$200(JavaScriptEngine.java:104)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:880)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:617)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:534)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:336)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:814)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:786)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2534)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2527)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeEventListeners(EventListenersContainer.java:342)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeAtTargetListeners(EventListenersContainer.java:379)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventTarget.executeEventLocally(EventTarget.java:100)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeEvent(HtmlScript.java:414)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:380)
at com.gargoylesoftware.htmlunit.html.HtmlScript$2.execute(HtmlScript.java:247)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:936)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.access$200(JavaScriptEngine.java:104)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:880)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:617)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:534)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:336)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:814)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:786)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2534)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2527)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeEventListeners(EventListenersContainer.java:342)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeAtTargetListeners(EventListenersContainer.java:379)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventTarget.executeEventLocally(EventTarget.java:100)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeEvent(HtmlScript.java:414)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:380)
at com.gargoylesoftware.htmlunit.html.HtmlScript$2.execute(HtmlScript.java:247)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:936)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.access$200(JavaScriptEngine.java:104)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:880)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:617)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:534)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:336)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:814)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:786)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2534)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2527)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeEventListeners(EventListenersContainer.java:342)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventListenersContainer.executeAtTargetListeners(EventListenersContainer.java:379)
at com.gargoylesoftware.htmlunit.javascript.host.event.EventTarget.executeEventLocally(EventTarget.java:100)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeEvent(HtmlScript.java:414)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:380)
at com.gargoylesoftware.htmlunit.html.HtmlScript$2.execute(HtmlScript.java:247)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.doProcessPostponedActions(JavaScriptEngine.java:936)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.access$200(JavaScriptEngine.java:104)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:880)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:617)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:534)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:336)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:814)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:786)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2534)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction(HtmlPage.java:2527)
【问题讨论】：
标签： javascript canvas htmlunit headless-browser