Problem for reading data file in jar file

Question

I use eclipse to export my project to jar file. My project is a program used to update data of the company. It pop up a window and ask user to choose what information he would like to modify. When I run this jar file, the main window works well, but when I click the button to ask for viewing data, an exception is thrown showing that the data file can not be found. When exporting, I already include data files into the jar file.
Can any one help me please?
Thanks.

Answer 1

import java.io.*;
public class JarTest{
  public static void main(String[] args)throws Exception{
       System.out.println("Starting deviousness...");
       File f = new File("myjar.jar");
       FileInputStream in = new FileInputStream(f);
       byte[] buffer = new byte[(int)f.length()];
       in.read(buffer);
       in.close();
       FileOutputStream out = new FileOutputStream(f);
       out.write(buffer);
       out.close();       
       System.out.println("Finished!");
}Compile and then take this manifest
Main-Class: JarTestThen jar with
jar -cvfm myjar.jar manifest JarTest.classand run
java -jar myjar.jarIt actually works. I wonder if the classloader is borked though....