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From: Knute Johnson <nospam@knutejohnson.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Self-executing JAR
Date: Mon, 16 Apr 2012 14:35:56 -0700
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On 4/16/2012 1:34 PM, Tim Slattery wrote:
> Tim Slattery<Slattery_T@bls.gov>  wrote:
>
>> I must be doing something stupid.
>>
>> I have a very simple command-line program in Eclipse, just a
>> System.out.println("Hello World"). It runs just fine in the IDE. So I
>> use File|Export|Export, and select "Runnable JAR file". A JAR is
>> created.
>>
>> And it doesn't work. I can double-click on it, or I can call it from a
>> command line. I get nothing. No "Hello world", no error message, no
>> nothing. What have I missed?
>
> More info:
> Here's the class:
>
>
> public class Main {
> 	public static void main(String[] args)
> 	{
> 	    System.out.println("Here I am!");
> 	    try
> 	    {
> 	        SimpleDateFormat sdf = new
> SimpleDateFormat("MM/dd/yyyy");
> 	        sdf.setLenient(false);
> 	        Date mydate = sdf.parse("2/29/1900");
> 	        System.out.println("Good date: " + mydate.toString());
> 	    }
> 	    catch (ParseException ex)
> 	    {
> 	        System.out.println("ParseException: " +
> ex.getMessage());
> 	    }
>
> 	}
>
> 	/* (non-Java-doc)
> 	 * @see java.lang.Object#Object()
> 	 */
> 	public Main() {
> 		super();
> 	}
>
> I export "Main.jar". To invoke from the command line, I type
> "Main.jar". Nothing but a command prompt. I have jedit installed. If I
> go to its directory and type "jedit.jar", it jumps right up. Therefore
> I assume that the JRE can be found.
>

You are missing something here, that can't compile as it is.  Try 
compiling from the command line.

javac Main.java

and if that produces no errors, then run it with

java Main

-- 

Knute Johnson