JAVA package 问题记录

最新推荐文章于 2018-05-08 00:19:04 发布

所有昵称都被用了呢

最新推荐文章于 2018-05-08 00:19:04 发布

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遇到的问题：在/..../list/DList.java

compile已过。DList.java 属于 package list

报错： javaDList

Exception in thread "main" java.lang.NoClassDefFoundError: DList(wrong name: list/DList)

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:800)

atjava.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

at java.net.URLClassLoader.access$100(URLClassLoader.java:71)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

atsun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

atsun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

解决方案：退出list文件夹，然后 java list.DList，成功

参考：from stack Overflow

My file directory:

project/src/m2mcom/entities/AutomatedTelnetClient.java
           /web/Simple.java           
           /org/apache/commons/net/telnet/TelnetClient.java

The source code of the Simple.java:

package m2mcom.web;
import m2mcom.entities.AutomatedTelnetClient;
import java.util.*;
import java.io.*;

public class Simple {
    public static void main(String [] args) {
        try {
            AutomatedTelnetClient telnet = new AutomatedTelnetClient();
            String answer = telnet.request();
            System.out.println(answer);
        } catch (Exception e) {
            System.err.println("Error");
        }
    }
}

And when I execute Simple.class, without any errors of compilation,I get this error message:

C:\Users\Victor\Desktop\project2\src\m2mcom\web>java Simple
Exception in thread "main" java.lang.NoClassDefFoundError: Simple (wrong name: m
2mcom/web/Simple)

Does anyone know how to solve this?

java noclassdeffounderror

share | improvethis question

edited Dec29 '13 at 22:12

Eric Leschinski
10.9k 7 54 73

asked Jan25 '13 at 11:23

vicesbur
35 1 1 6

Have a look at this link you will understand why you get that errorand how to avoid it in the futurejavarevisited.blogspot.co.uk/2011/06/… – Razh Jan25 '13 at 11:33

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3 Answers

active oldest votes

up vote 16 downvote

You're executing the command in the wrong folder, with the wrongclassname. You need to use the fully qualified name (FQN) whenrunning a Java class. And of course, you have to be in the rightdirectory. In your example, the FQN of your class ism2mcom.web.Simple (combination ofthe package m2mcom.webandthe simple name Simple).

As far as deducing the right directory, your classes are stored ina hierarchical folder structure, which basically startsin C:\Users\Victor\Desktop\project2\src.

So to correctly execute your program,from C:\Users\Victor\Desktop\project2\src,do;

java m2mcom.web.Simple

所有昵称都被用了呢

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JAVA package 问题记录

遇到的问题：在/..../list/DList.javacompile已过。DList.java 属于 package list报错：javaDListException in thread "main" java.lang.NoClassDefFoundError: DList(wrong name: list/DList)at java.lang.ClassLoader.def
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