Problem with getting LWJGL to work outside of Eclipse

Newbie & Debugging Questions
#1

I have the problem that when I work in Eclipse I can get a window to open as it should but for some reason I can’t get it to start once I’ve exported the program to a JAR-file. I made a very simple example where I only draw a single image on the center of the screen and tried that. It worked in Eclipse and it didn’t work once exported (in a way I’m glad that is so, it shows the problem is quite basic and not a huge error in my other program).
I’ve added in the code here so that you can see. It works in Eclipse, but not when exported.


import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.ARBDebugOutput.*;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;

import javax.imageio.ImageIO;
import javax.swing.JOptionPane;

import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.ARBDebugOutputCallback;
import org.lwjgl.opengl.ContextAttribs;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GLContext;
import org.lwjgl.opengl.PixelFormat;


public class OpenGL_Example {

	public static void main(String[] args) {
		try {
			//Display.setDisplayMode(new DisplayMode(600, 400));
			Display.setDisplayModeAndFullscreen(Display.getDesktopDisplayMode());
			Display.create(new PixelFormat(), new ContextAttribs().withDebug(true)); 
			//Display.setVSyncEnabled(true);
			if(GLContext.getCapabilities().GL_ARB_debug_output){
				glDebugMessageCallbackARB(new ARBDebugOutputCallback());
			}
		} catch (LWJGLException e) {
			e.printStackTrace();
		}
		
		BufferedImage image = null;
		
		try {
			image = ImageIO.read(new File("BucketKitties.jpg"));	//Just your average cat image
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		int width = image.getWidth(), height = image.getHeight();
		int[] pixels = image.getRGB(0, 0, width, height, new int[width*height], 0, width);
		
		ByteBuffer data = BufferUtils.createByteBuffer(3*width*height);
		//System.out.println(data);
		for(int i = 0; i < pixels.length; i++){
			int pixel = pixels[i];
			data.put((byte) ((pixel >> 16) & 0xFF));     // Red component
            data.put((byte) ((pixel >> 8) & 0xFF));      // Green component
            data.put((byte) (pixel & 0xFF));			 // Blue component
		}
		//System.out.println(data);
		data.flip();		//Sets the Reading Marker to the start of the buffer
		//System.out.println(data);
		
		int texture = glGenTextures();
		glBindTexture(GL_TEXTURE_2D, texture);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
		
		//We don't need different sized images for this
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);	
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		
		glEnable(GL_TEXTURE_2D);
		
		
		while(!Display.isCloseRequested()){
			
			glClearColor(0, 0, 0, 0);
 			glClear(GL_COLOR_BUFFER_BIT);
 			
 			glMatrixMode(GL_PROJECTION);	//Loads the Projection-matrix
 			glLoadIdentity();	//Resets the projection-matrix
 			//Sets a coordinate system where one pixel on the screen equals one coordinate
 			glOrtho(0, Display.getWidth(), Display.getHeight(), 0, -1, 1);	
 			
 			glMatrixMode(GL_MODELVIEW);	//The "Camera Position Matrix"
 			glLoadIdentity();	
 			glTranslatef(Display.getWidth()/2, Display.getHeight()/2, 0);	//We want to draw with the center of the screen as (0, 0)
 			
 			glBegin(GL_QUADS);
 			{
	 			glColor3f(1, 1, 1);
	 			glTexCoord2f(0, 0);
	 			glVertex2f(-250, -250);
	 			
	 			//glColor3f(0, 1, 0);
	 			glTexCoord2f(1, 0);
	 			glVertex2f(250, -250);
	 			
	 			//glColor3f(0.5f, 0.5f, 0.5f);
	 			glTexCoord2f(1, 1);
	 			glVertex2f(250, 250);
	 			
	 			//glColor3f(0, 0, 1);
	 			glTexCoord2f(0, 1);
	 			glVertex2f(-250, 250);
 			}
 			glEnd();
			
			Display.sync(100);
			Display.update();
		}
		Display.destroy();
		JOptionPane.showMessageDialog(null, "Complete!");
	}

}