[英]Why am I getting a NoClassDefFoundError?
有誰能告訴我為什么我會收到這個錯誤,以及如何解決這個問題?
org.codehaus.staxmate.dom.DOMConverter中org.codehaus.staxmate.dom.DOMConverter._build(DOMConverter.java:188)中的線程“main”java.lang.NoClassDefFoundError:org / codehaus / stax2 / ri / Stax2ReaderAdapter中的異常.buildDocument(DOMConverter.java:171)org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:152)位於xmlprocessing的org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:131)。 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引起的位於java..L.Liscuncal的java.lang.ClassLoader.loadClass(ClassLoader.java:307)java.net.URLClassLoader.findClass(URLClassLoader.java:190)的.AccessController.doPrivileged(Native Method)$ AppClassLoader.loadClass(Launcher) .java:301)在java.lang.ClassLoader.loadClass(ClassLoader.java:248)... 5更多Java結果:1
我寫了下面的代碼:
//-*-*-
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();
你需要確保正確的Woodstox在你的道路上。 基本上,您正在使用在該jar中實現的類,但由於jar不在路徑中,因此Java不知道您引用了哪個類。
這意味着找到了一個不包含預期類的.class文件,因為該包與目錄結構不對應,或者因為文件在編譯后被重命名。 還有其他原因,但這是最常見的。
對不起,我對3個答案投了反對,但突然有了疑問,需要仔細檢查我的想法...而且最終比我想象的更復雜。 但是我在這里找到了一個非常完整的答案: http : //mindprod.com/jgloss/runerrormessages.html#NOCLASSDEFFOUNDERROR
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