为什么我得到NoClassDefFoundError？

Question

有谁能告诉我为什么我会收到这个错误,以及如何解决这个问题？

org.codehaus.staxmate.dom.DOMConverter中org.codehaus.staxmate.dom.DOMConverter._build(DOMConverter.java:188)中的线程"main"java.lang.NoClassDefFoundError:org/codehaus/stax2/ri/Stax2ReaderAdapter中的异常.buildDocument(DOMConverter.java:171)位于org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:152)的org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:131)xmlprocessing. api.STAXModifyCV.main(STAXModifyCV.java:68)由java.security上的java.net.URLClassLoader $ 1.run(URLClassLoader.java:202)中的java.lang.ClassNotFoundException:org.codehaus.stax2.ri.Stax2ReaderAdapter引起的java.lang上的java.net.URLClassLoader.findClass(URLClassLoader.java:190)中的.AccessController.doPrivileged(Native Method).class.Loader.loadClass(ClassLoader.java:307)at sun.misc.Launcher $ AppClassLoader.loadClass(Launcher.java:301)at java.lang.ClassLoader.loadClass(ClassLoader.java:248)... 5更多Java结果: 1

我写了下面的代码:

    //-*-*-
    FileInputStream input = new FileInputStream("cv.xml");
    XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(input);
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

    //-*-*- get new entries from input stream
    System.out.println("<< Sahar CV >>\n -> Modify the first reference\n    ** Modify The Name **");
    System.out.print("    Enter degree : ");
    String degree = in.readLine();
    System.out.print("    Enter first name : ");
    String fName = in.readLine();
    System.out.print("    Enter last name : ");
    String lName = in.readLine();
    System.out.println("    ** Modify The Address ** ");
    System.out.print("    Enter new city : ");
    String newCity = in.readLine();
    System.out.print("    Enter new country : ");
    String newCountry = in.readLine();

    //-*-*- let the reader point at the first "reference" element
    int eventType;
    boolean ref = false, fname = false;
    while (!ref && reader.hasNext()) {
        eventType = reader.next();
        switch (eventType) {
            case XMLEvent.START_ELEMENT:
                if (reader.getLocalName().equalsIgnoreCase("references")) {
                    ref = true;
                    break;
                }
        }
    }
    System.out.println("I am here");

    //-*-*- start modification
    Document doc = new DOMConverter().buildDocument(reader);
    Element firstRef = (Element)doc.getElementsByTagName("reference").item(0);
    NodeList name = (NodeList)firstRef.getElementsByTagName("name");
    //-*-*- modify the degree (Dr. , Eng. , Dev. ,etc)
    Attr att = (Attr)name.item(0).getAttributes().item(0);
    ((Node)att).setNodeValue(degree);
    //-*-*- modify first name
    NodeList firstName = (NodeList)firstRef.getElementsByTagName("fname");
    NodeList firstNameChilds = (NodeList)firstName.item(0).getChildNodes();
    ((Node)firstNameChilds.item(0)).setNodeValue(fName);
    //-*-*- modify last name
    NodeList lastName = (NodeList)firstRef.getElementsByTagName("lname");
    NodeList lastNameChilds = (NodeList)lastName.item(0).getChildNodes();
    ((Node)lastNameChilds.item(0)).setNodeValue(lName);
    //-*-*- modify city
    NodeList city = (NodeList)firstRef.getElementsByTagName("city");
    NodeList cityChilds = (NodeList)city.item(0).getChildNodes();
    ((Node)cityChilds.item(0)).setNodeValue(newCity);
    //-*-*- modify country
    NodeList country = (NodeList)firstRef.getElementsByTagName("country");
    NodeList countryChilds = (NodeList)country.item(0).getChildNodes();
    ((Node)countryChilds.item(0)).setNodeValue(newCountry);

    reader.close();
    input.close();
    //-*-*- write DOM document
    FileOutputStream out = new FileOutputStream("cv.xml");
    XMLStreamWriter sw = XMLOutputFactory.newInstance().createXMLStreamWriter(out);

    new DOMConverter().writeDocument(doc, sw);
    sw.close();
    out.close();

Answer 1

你需要确保正确的Woodstox在你的道路上.基本上,您正在使用在该jar中实现的类,但由于jar不在路径中,因此Java不知道您引用了哪个类.