Selenium (XercesImpl) 和 Google App Engine 出现问题

Question

我从 Selenium 下载页面 下载了 selenium-java-2.0b3.zip。我将其解压并将所有 .jar 添加到一个简单 Eclipse 项目的构建路径中：

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;


public class Main {
    public static void main(String[] args) {
        WebDriver driver = new HtmlUnitDriver();
        driver.get("http://www.google.com");
        System.out.println(driver.getPageSource());
    }
}

这工作正常。然后，我尝试将所有库添加到 GWT/GAE 项目的构建路径中。如果不添加任何引用库的代码，当我尝试运行该项目时，我会看到这些错误：

Initializing AppEngine server
Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Successfully processed foo\war\WEB-INF/appengine-web.xml
Successfully processed foo\war\WEB-INF/web.xml
[WARN] failed com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@495e160e{/,foo\war}: javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found
[WARN] failed JettyContainerService$ApiProxyHandler@3ffa16c3: javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found
[WARN] Error starting handlers
javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found
    at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
    at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:91)
    at org.mortbay.xml.XmlParser.<init>(XmlParser.java:83)
    at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp(TagLibConfiguration.java:210)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1247)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:186)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:157)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:169)
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:119)
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:500)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1055)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804)
    at com.google.gwt.dev.DevMode.main(DevMode.java:309)
[WARN] Nested in javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found:
java.lang.ClassNotFoundException: org.apache.xerces.jaxp.SAXParserFactoryImpl
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at javax.xml.parsers.FactoryFinder.getProviderClass(Unknown Source)
    at javax.xml.parsers.FactoryFinder.newInstance(Unknown Source)
    at javax.xml.parsers.FactoryFinder.findJarServiceProvider(Unknown Source)
    at javax.xml.parsers.FactoryFinder.find(Unknown Source)
    at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
    at org.mortbay.xml.XmlParser.setValidating(XmlParser.java:91)
    at org.mortbay.xml.XmlParser.<init>(XmlParser.java:83)
    at org.mortbay.jetty.webapp.TagLibConfiguration.configureWebApp(TagLibConfiguration.java:210)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1247)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:186)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:157)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:169)
    at com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:119)
    at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:500)
    at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1055)
    at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804)
    at com.google.gwt.dev.DevMode.main(DevMode.java:309)
The server is running at http://localhost:8888/

我做错了什么？

更新：这个问题可能会有一些启示。

更新 2：这个问题。

Answer 1

将 Selenium 下载中的所有 jar 复制到 war/WEB-INF/lib 并将它们添加到构建路径中。