Java APIs

Alright, I am truthfully stumped on this one. The only thing I can thing of that would cause this to happen, is the fact that this game I made 2 years ago, which took 2 weeks; I have got to get it back working, was made before the newest update to java was released. I get this error everytime I try to load the applet in the browser, even if i use a .jar file, same error occurs. It works great in the SDK executer, but not web browser. All my updates to java are up to date, yet I get this error for appearingly no reason. I changed no code, just updated it. And of course, when I loaded the .jcp file, it said it needed to convert the file to the new version of Java. Now I get noninited.
What I am looking for, is more or less, why?
I cannot even pinpoint the error. The Java Console is empty, so being the newb that I am at Java, I need to understand what the main causes for that error to be displayed are, therefore allowing me to pinpoint the error, and solve my problem.
Can anyone lend me a few ideas?