NoClassDefoundError Htmlunit

Question

import java.util.List;

import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlElement;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

public class Test {

public static void main(String s[]) throws Exception 
{
    WebClient client = new WebClient();
    HtmlPage page = client.getPage("http://jpu1.pv.sv.nextag.com/serv/iinedan/buyer/outPdir.jsp?search=camera");

    List<?> items = page.getByXPath("//div[contains(@class,'search-result-cards')]//div[contains(@class,'listContainer')]");

    for(HtmlElement item : (List<HtmlElement>)items)
    {
        List<?> imageContainer;

        imageContainer = item.getByXPath("//div[contains(@class,'imageContainer')]/a");

        System.out.println("Image container data length : "+imageContainer.size());

        System.out.println("Image "+imageContainer.toString());

    }

  }

}

但当我执行这段代码时，我面临以下异常。

Exception in thread "main" java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at Test.main(Test.java:11)
Caused by: java.lang.ClassNotFoundException: 
org.w3c.dom.ElementTraversal
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 37 more

它似乎喜欢它的一个配置，伊索。我从站点下载了jar并将其添加到我的refrenced库中。我使用的IDE是Eclipse。HtmlUnit版本为htmlunit-2.13.jar

Answer 1

htmlunit所依赖的库xml-apis-1.4.01.jar中存在的org/w3c/dom/elementtraversal。因此，作为一种解决方案，您需要将这个jar放在项目的类路径中。

但是，htmlunit取决于库的数量。在您解决了当前错误之后，您可能会得到某个其他类的NoClassDefoundError。

为了轻松地解决它，可以开始使用Maven。

<dependencies>
<dependency>
    <groupId>net.sourceforge.htmlunit</groupId>
    <artifactId>htmlunit</artifactId>
    <version>2.13</version>
</dependency>
</dependencies>