Java 为什么我会遇到NoClassDefFoundError?
有人能告诉我为什么会出现这个错误,以及如何解决这个问题吗 线程“main”java.lang.NoClassDefFoundError中出现异常:org/codehaus/stax2/ri/Stax2ReaderAdapter 位于org.codehaus.staxmate.dom.DOMConverter.\u build(DOMConverter.java:188) 位于org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:171) 位于org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:152) 位于org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConverter.java:131) 位于xmlprocessing.api.STAXModifyCV.main(STAXModifyCV.java:68) 原因:java.lang.ClassNotFoundException:org.codehaus.stax2.ri.Stax2ReaderAdapter 位于java.net.URLClassLoader$1.run(URLClassLoader.java:202) 位于java.security.AccessController.doPrivileged(本机方法) 位于java.net.URLClassLoader.findClass(URLClassLoader.java:190) 位于java.lang.ClassLoader.loadClass(ClassLoader.java:307) 位于sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) 位于java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 还有5个 Java结果:1 我写了下面的代码:Java 为什么我会遇到NoClassDefFoundError?,java,Java,有人能告诉我为什么会出现这个错误,以及如何解决这个问题吗 线程“main”java.lang.NoClassDefFoundError中出现异常:org/codehaus/stax2/ri/Stax2ReaderAdapter 位于org.codehaus.staxmate.dom.DOMConverter.\u build(DOMConverter.java:188) 位于org.codehaus.staxmate.dom.DOMConverter.buildDocument(DOMConve
//-*-*-
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();
//-*-*-
FileInputStream输入=新的FileInputStream(“cv.xml”);
XMLStreamReader reader=XMLInputFactory.newInstance().createXMLStreamReader(输入);
BufferedReader in=新的BufferedReader(新的InputStreamReader(System.in));
//-*-*-从输入流中获取新条目
System.out.println(“>\n->修改第一个引用\n**修改名称**”);
系统输出打印(“输入学位:”);
字符串度数=in.readLine();
System.out.print(“输入名字:”);
字符串fName=in.readLine();
System.out.print(“输入姓氏:”);
字符串lName=in.readLine();
System.out.println(“**修改地址**”);
系统输出打印(“进入新城市:”;
字符串newCity=in.readLine();
系统输出打印(“输入新国家:”;
字符串newCountry=in.readLine();
//-*-*-让读者指向第一个“reference”元素
int事件类型;
布尔值ref=false,fname=false;
而(!ref&&reader.hasNext()){
eventType=reader.next();
开关(事件类型){
案例XMLEvent.START_元素:
if(reader.getLocalName().equalsIgnoreCase(“引用”)){
ref=真;
打破
}
}
}
System.out.println(“我在这里”);
//-*-*-启动修改
Document doc=new DOMConverter().buildDocument(读卡器);
元素firstRef=(元素)doc.getElementsByTagName(“参考”)。项(0);
NodeList name=(NodeList)firstRef.getElementsByTagName(“名称”);
//-*-*-修改学位(博士、工程师、开发人员等)
Attr att=(Attr)name.item(0.getAttributes().item(0);
((节点)att.setNodeValue(度);
//-*-*-修改名字
NodeList firstName=(NodeList)firstRef.getElementsByTagName(“fname”);
NodeList firstNameChilds=(NodeList)firstName.item(0.getChildNodes();
((节点)firstNameChilds.item(0)).setNodeValue(fName);
//-*-*-修改姓氏
NodeList lastName=(NodeList)firstRef.getElementsByTagName(“lname”);
NodeList lastNameChilds=(NodeList)lastName.item(0.getChildNodes();
((节点)lastNameChilds.item(0)).setNodeValue(lName);
//-*-*-修改城市
NodeList city=(NodeList)firstRef.getElementsByTagName(“城市”);
NodeList cityChilds=(NodeList)city.item(0.getChildNodes();
((节点)cityChilds.item(0)).setNodeValue(newCity);
//-*-*-修改国家
NodeList country=(NodeList)firstRef.getElementsByTagName(“国家”);
NodeList countryChilds=(NodeList)country.item(0.getChildNodes();
((节点)countryChilds.item(0)).setNodeValue(新国家);
reader.close();
input.close();
//-*-*-编写DOM文档
FileOutputStream out=新的FileOutputStream(“cv.xml”);
XMLStreamWriter sw=XMLOutputFactory.newInstance().createXMLStreamWriter(输出);
新的DOMConverter().写文件(doc,sw);
sw.close();
out.close();
您需要确保正确的Woodstox在您的路径上。基本上,您使用的是在该jar中实现的类,但是由于jar不在路径中,Java不知道您引用的是什么类 这意味着发现一个.class文件不包含所需的类,这可能是因为包与目录结构不一致,也可能是因为编译后重命名了该文件。还有其他原因,但这是最常见的 很抱歉,我否决了3个答案,但突然产生了疑问,需要再次检查我的想法。。。结果比我想象的要复杂。然而,我在这里为您找到了一个非常完整的答案:
为什么对这些答案都投了反对票?我已经编辑了剩下的两个答案,现在您可以删除反对票了。