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How do I run my java program

Posted on 2012-04-07
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Last Modified: 2012-04-12
I created a java program with Eclipse.  I tried running my program from command prompt (e.g. myprogram.java)

C:\myjavaprograms> java myprogram

but it gives the below error (running javac does not throw an error)

Exception in thread "main" java.lang.NoClassDefFoundError: myprogram (wrong na
me: ceasarcipherprogram/myprogram)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
0
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Question by:CipherIS
9 Comments
 
LVL 3

Expert Comment

by:fjocke
ID: 37820253
From what i can tell , you get No definition for a requested class error, which would imply that you havn't matched the class name of your project to name of your source file.

Name the file for instance mytest.java and then also name the class to mytest.
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Author Comment

by:CipherIS
ID: 37820256
Here is an example of my code.

package ceasarcipherprogram;

import java.util.Scanner;

public class myprogram{
	
	public static void main(String[] args){
             //Code Here
         }
}

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0
 
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Expert Comment

by:fjocke
ID: 37820275
You need to export your project as jar before you can run it with java.exe.

If you run eclipse, simply just CTRL-F11 to run the code.

Add System.out.println("Hello"); in your main function and you'll see it works :)
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LVL 1

Author Comment

by:CipherIS
ID: 37820479
It runs in eclipse.  I do have more code i just gave a sample.  I was trying to figure out how to run it with command prompt.
0
 
LVL 3

Expert Comment

by:fjocke
ID: 37820725
The simplest way would be to export you code into a .jar file :)

Else you can follow this guide to achieve what you want:

http://www.javaworkspace.com/setClasspath.do
0
 
LVL 12

Expert Comment

by:Sharon Seth
ID: 37821012
You are not executing the command line fromthe correct path . Eclipse would have created the required class files in bin folder of your project .So, cd to that path and then execute the commandline .
0
 
LVL 2

Expert Comment

by:Elbassel
ID: 37821174
This link should help you:
How to execute java program in CMD in windows?
The main class(that has main method) must be public and the name of the file must be the name of the class.

Best wishes
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LVL 86

Accepted Solution

by:
CEHJ earned 500 total points
ID: 37821367
Try

C:\myjavaprograms> javac -d .  myprogram.java

C:\myjavaprograms>java ceasarcipherprogram.myprogram

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0
 
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Expert Comment

by:Geisrud
ID: 37823151
Have you installed the java Development Kit (JDK) on your computer so you can compile and run java programs?  Or are you just worked from Eclipse?

You may want to look around this page if you need the JDK
http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html#javasejdk
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