java.lang.NoClassDefFoundError: org/dom4j/Document

问题

I have a class called XMLtoXML.java and this is one of it's methods...

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);

last line of code block uses a dom4j Document.i have dom4j-full.jar in my classpath. if i run this class as standalone(Run as Java application in eclipse) then it works fine. when i add this class as part of web appllication and dom4j-full.jar in my classpath.
i got following exception.

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)

I am also sure that the dom4j jar present on classpath. Anybody have any ideas about issue?

回答1:

Looks like dom4j-full.jar contains both dom4j and jaxen. From you stacktrace I understand dom4j is in the classpath, and it can find jaxen, but when jaxen looks for dom4j it can't find it. I think the jaxen that has been loaded from dom4j isn't for some reason that one inside the dom4j-full.jar but another one that you have within your application server classpath (and not in your eclipse of course), perhaps loaded from a different classloader. Maybe you have a jaxen.jar in your shared libraries or something like this.