Question

I’m running the following code on Ubuntu 10.10, using OpenJDK 1.6.0_18:

 package mypkg;
 public class MyTest {
   public static void main(final String[] args) {
     System.out.println(args.length + " argument(s)");
     for (final String arg : args) {
       System.out.println(arg);
     }
   }
 }

After compiling it into a Jar, I’m completely puzzled why executing the following command from the terminal returns 0 argument(s):

java -jar mytest.jar this is a test

This is my interpretation of the Java docs, stating:

java [ options ] -jar file.jar [ argument … ]

I almost have the feeling that I’m entering a wrong command in the terminal. What gives?

Edit: the MANIFEST.MF contains:

Manifest-Version 1.0
Created-By: 1.6.0_18 (Sun Microsystems Inc.)
Main-Class: mypkg.Starter
Class-Path: .

Answer 1

Have a look at the contents of your META-INF/MANIFEST.MF file; make sure your Main-Class is using the correct class.