Java Error: Java virtual Machine Launcher:" A Java exception has occurred"

I recently decided to get back into playing private servers but I was noticing that a ton of things have changed.
I have a 64 bit computer running windows 8.1 with the latest version of java installed. However every time I run a JAR file a window pops up saying "A java exception has occurred". I have no idea what to do or how to fix it. Thanks in advance for any help anyone may offer.

This is the Error: