Because we are using the JSSE providers that are shipped with the Sun JDK, JIRA's encoding & decoding of the license does not work on IBM JDK.

You will see the following exceptions in your logs:

Exception looking up public key: no such provider: SUN
java.security.NoSuchProviderException: no such provider: SUN

The line that needs to be changed is:

KeyFactory keyFactory = KeyFactory.getInstance("DSA", "SUN");

Perhaps we can remove the explicit call to "SUN".