I am having a very similar problem to the last poster. I am creating my project as a .jar file and then using jarsplice to add all the required libraries. My fat jar will not open. If I run it with cmd I simply get the error, "Unable to access jarFile Game.jar". I believe the issue lies in how I am pointing to my main class. Just to clarify, I assume it wants the path to the class that contains my main method (which in my case happens to be named Main). If I get the path directly from Eclipse, it is "/Game/src/Game/Main.java". I have tried "Game.Main" and "Game.src.Game.Main" with the same results. Do I have the path correct? Thanks.
UPDATE: I was able to get my project to run by insuring that the "native" folder from the jlwgl file is within the same folder as the fat jar. Using jarsplice to add those directly to the fat jar did not work for me.
UPDATE2: I discovered through this (
https://www.youtube.com/watch?v=TfwcbMcT-Ig) tutorial that I needed to point the program to the native file location and I did not know how to do that.