经典问题,NoClassDefFoundError我需要什么?创建新课程?
import java.net.*;
import java.io.*;
import org.xsocket.*;
import org.xsocket.connection.*;
import java.io.IOException;
public class SocketClient {
public static void main(String[] args) {
try {
IBlockingConnection bc = new BlockingConnection("127.0.0.1", 8090);
String req = "Hello server";
bc.write(req + "\r\n");
} catch (IOException e){}
System.out.println("missing");
}
}
我得到以下异常:
C:\Users\Wildfire\Desktop>java -cp xSocket-2.8.14.jar SocketClient Exception in thread "main" java.lang.NoClassDefFoundError: SocketClient Caused by: java.lang.ClassNotFoundException: SocketClient at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) Could not find the main class: SocketClient. Program will exit.
答案 0 :(得分:6)
这应该有效:
java -cp xSocket-2.8.14.jar SocketClient
(“cp”是“classpath”的缩写)
答案 1 :(得分:4)
java -cp xSocket-2.8.14.jar;. SocketClient
您缺少类路径中的当前目录。
为了完整性(感谢Mark):
在Unix / Linux / etc上......:java -cp xSocket-2.8.14.jar:. SocketClient
答案 2 :(得分:1)
您的类路径可能有误。尝试:
java -classpath dir_missing_from_class_path your_java_file