java.lang.NoClassDefFoundError：org / dom4j / Document

Question

我有一个名为XMLtoXML.java的类，这是它的方法之一…

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public Object[] process(Object data) {

    String templateXML = null;
    Object result[] = null;
    String inputxml = null;
    String templateNumber = null;
    Iterator iterator = null;
    String scenarioConfigUrl = null;
    Node inputNode;
    Node outputNode;
    String subTemplateXML = null;
    String outputXml = null;

    if (delay != null) {

        long time = Long.parseLong(delay);
        try {
            Thread.sleep(time);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    inputxml = (String) metadata.get(Constants.REQUEST);
    if (inputxml == null) {
        throw new NullRecordException("input data to XMLtoXML class  in   
      metadata map is null");
    }
    Document inputXMLDocument = Dom4jUtils.getDocument(inputxml);

代码块的最后一行使用dom4j Document.i在我的类路径中有dom4j-full.jar。
如果我以独立形式运行此类（在eclipse中以Java应用程序运行），那么它将正常工作。当我将该类作为Web应用程序的一部分和dom4j-full.jar添加到我的类路径中时。
我得到以下例外。

java.lang.NoClassDefFoundError: org/dom4j/Document
   at org.jaxen.dom4j.DocumentNavigator.getDocumentNode(DocumentNavigator.java:346)
   at org.jaxen.expr.DefaultAbsoluteLocationPath.evaluate
    (DefaultAbsoluteLocationPath.java:102)

   at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:102)
   at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:674)
   at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:213)
   at org.jaxen.BaseXPath.selectSingleNode(BaseXPath.java:234)
   at org.dom4j.xpath.DefaultXPath.selectSingleNode(DefaultXPath.java:156)
   at org.dom4j.tree.AbstractNode.selectSingleNode(AbstractNode.java:188)
   at org.amdocs.convert.XMLtoXML.process(XMLtoXML.java:134)
   at org.openadaptor.core.node.Node.processSingleRecord(Node.java:148)
   at org.openadaptor.core.node.Node.process(Node.java:170)
   at org.openadaptor.core.node.ProcessorNode.process(ProcessorNode.java:96)
   at org.openadaptor.core.router.AbstractRouter.process(AbstractRouter.java:239)
   at org.openadaptor.core.router.AbstractRouter.process(AbstractRouter.java:223)
   at org.openadaptor.core.router.AbstractRouter.processResponse(AbstractRouter.java:249)
   at org.openadaptor.core.router.AbstractRouter.process(AbstractRouter.java:239)
   at org.openadaptor.core.router.AbstractRouter.process(AbstractRouter.java:223)
   at org.openadaptor.core.router.AbstractRouter.process(AbstractRouter.java:180)
   at org.openadaptor.core.adaptor.Adaptor.process(Adaptor.java:285)
   at org.openadaptor.core.node.Node.callChainedMessageProcessor(Node.java:213)
   at org.openadaptor.core.node.Node.process(Node.java:199)
   at org.openadaptor.core.node.ReadNode.process(ReadNode.java:241)
   at org.openadaptor.core.node.ReadNode.run(ReadNode.java:196)
   at java.lang.Thread.run(Thread.java:619)

我也确信dom4j jar存在于classpath中。有人对问题有任何想法吗？

Answer 1

看起来dom4j-full.jar包含dom4j和jaxen。从您的stacktrace可以理解dom4j，它位于类路径中，并且可以找到jaxen，但是在jaxen查找时dom4j找不到。我认为从dom4j某个原因加载的jaxen
并不是出于某种原因，dom4j-full.jar而是由于您在应用程序服务器类路径中（当然不在eclipse中）存在的另一个原因，也许是从其他类加载器加载的。也许您jaxen.jar在共享库中有一个或类似的东西。