Creating Runnable Jar with external files included

Here's what you should do instead:

Put that file back in your jar file. Use class.getResourceAsStream() to read it instead of File and FileReader. Here is an explanation of how to do that: How to really read text file from classpath in Java

Problem Solved!

here is how:

1) right click your project folder and create a new folder.

2) move all of your files that you want packed into the jar into that folder.

3) click project -> properties -> Build Path -> Source -> Add Folder and select that folder you just created.

4) create your JAR!

Since you already have created your folder with abc.txt insideit, you can skip steps 1 and 2

EDIT: one way you can make sure your JAR contains these files is to use 7zip.