JRE 7 u40 - Self Sifned jarfiles

I have downloaded and tries JRE 7 u40 which on Forms 11.1.1.7. We have self-signed jarfiles and I noticed that I no longer have the option to "Remember this decision" when I click on RUN. Also there is a message that self-signed cerificates will be blocked in the future.

1) Is there any documentation on how to sign these files with a trusted certificate? We do have a .cer file from a certificate authority that we use in our Web Site on the same server. However the jarfiles used in forms are simply signed with sign_webutil. Can we use this .cer file we already have or it has to be a different file?