Question

我试图在Netbeans平台项目中使用webdrive，但我一直收到以下错误：

java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "com.gargoylesoftware.htmlunit.html.DomNode.getAttributes()Lorg/w3c/dom/NamedNodeMap;" the class loader (instance of org/netbeans/StandardModule$OneModuleClassLoader) of the current class, com/gargoylesoftware/htmlunit/html/DomNode, and the class loader (instance of <bootloader>) for interface org/w3c/dom/Node have different Class objects for the type 3c/dom/NamedNodeMap; used in the signature
at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:187)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:268)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:156)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:437)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:311)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:376)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.get(HtmlUnitDriver.java:476)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.get(HtmlUnitDriver.java:454)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.<init>(HtmlUnitDriver.java:180)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.<init>(HtmlUnitDriver.java:190)
at geo.parser.GeocacheParser.getNextPage(GeocacheParser.java:102)
at geo.DetailsTopComponent.btnLoadPlus20ActionPerformed(DetailsTopComponent.java:250)
at geo.DetailsTopComponent.access$200(DetailsTopComponent.java:61)
at geo.DetailsTopComponent$3.actionPerformed(DetailsTopComponent.java:125)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)

[catch]

    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
WARNING [org.netbeans.TopSecurityManager]: use of system property netbeans.home has been obsoleted in favor of InstalledFileLocator/Places at org.netbeans.Clusters.relativeDirsWithHome(Clusters.java:137)

有人可以帮忙吗？

Answer 1

您的类路径中有不同版本的org / w3c / dom / NamedNodeMap。

您应该检查项目构建首选项，因为对于一个项目，您可能具有相同的xml-apis-X.YZ.jar两次（具有不同的版本）。（但我检查了我的项目依赖项.... selenium-server-standalone-2.41.0.jar也包含这个类。）

解决方案是从类路径中删除此类文件的错误版本。一种解决方法是手动删除未使用的jar文件。（或将jar范围设置为提供）

<强>更新

使用此方法显示项目类路径：

void displayClassPath() {  

    ClassLoader classloader = Thread.currentThread().getContextClassLoader();  

    do {  
        URL[] urls = ((URLClassLoader)classloader).getURLs();  

        for(URL url: urls){  
            System.out.println(url.getFile());  
        }  
        classloader = (URLClassLoader)classloader.getParent();  

    } while(classloader != null);  
}

您可以在文件系统中找到NamedNodeMap类文件的所有实例（在列出的jar文件中）。尝试排除无效/已弃用/旧版本。

...或者......另一种方法是使用JVM选项-verbose。它显示所有已加载的JAR文件和类（和接口）。

[Loaded org.openqa.selenium.io.FileHandler$NoFilter from file:/C:/Program%20Files/Java/jre7/lib/ext/selenium-java-2.41.0.jar]
[Loaded java.nio.channels.ReadableByteChannel from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.nio.channels.ByteChannel from C:\Program Files\Java\jre7\lib\rt.jar]

例如：我在Eclipse中有一个Selenium项目，我使用了displayClassPath（）方法。在类路径中创建了三个NamedNodeMap实例，在这些jar文件中具有相同的签名：

硒 - 服务器 - 独立-2.41.0.jar
XML的API-1.4.01.jar
jre7 \ lib中\ rt.jar中

（要检查签名，您可以反编译.class文件：http://jd.benow.ca/）

有关它的一些链接：

Answer 2

对于其他收到此错误的人，因为我认为到目前为止还没有充分解释：

如前所述，rt.jar包含此类，它是Java运行时本身。因此，如果您将xml-apis jar作为依赖项或任何其他依赖项将其作为依赖项，您将收到该错误。

Gradle的修复（但可以很容易地插入到任何其他java构建工具中），htmlunit用作示例，但它可以是任何其他依赖项：

compile('net.sourceforge.htmlunit:htmlunit:2.27' ){
    exclude group: 'xml-apis', module: 'xml-apis'
}

查找依赖项运行

gradle dependencies

问题是因为gradle确实无法将xml-apis与rt.jar进行比较，所以它不会进行版本检查，通常你可以在这里看到：

   \--- xerces:xercesImpl:2.9.1 -> 2.11.0

->表示xerces已被更新版本取代以避免冲突，因为另一个依赖项已经在使用更新的版本。

在Netbeans平台项目中使用webdriver的链接错误

2 个答案: