-tsa or -tsacert timestamp for applet jar self-signed

Question

When I was trying to self-sign in the jar like below.

jarsigner -keystore my keystore myjar.jar myalias

It gives warning like:

Answer 1

This warning tells you that your jar's certificate will expire in may. Hence, users will not be able to execute your program after this date.

To improve the situation, the timestamp feature was added. This way, you can tell users: "I used the certificate at this point of time (which is provided and verified by the time stamp agency - tsa), when it was still valid!" As long as you do not change and resign your jar, it will still run, even after the certificate expires, because users see that at the point of creation the certificate was indeed valid.

For reference: http://docs.oracle.com/javase/7/docs/technotes/guides/security/time-of-signing.html

tl;dr: if you ignore the warning, your jar won't run after 14-05-08. Add a timestamp, and it will still run as long as you don't modify anything.

Regards