I\'m making a basic game in Java using the LWJGL Library via Netbeans.
I\'ve created a library with the lwjgl, lwjgl_util, and jinput .jar\'s, and I added -Djava.lib
I had this problem and fixed it using jarSplice (http://ninjacave.com/jarsplice)
make sure you delete all of the preplaced natives in your jar before you create the fat jar, otherwise it will create a duplicate error