The NBU Java Admin Console always installs it's own copy of the Java JRE (Java Runtime Environment), and this is true for all O/S flavours to the NBU Java Admin Console. The NBU Java Console is very specific to it's bundled "jre". Normally most systems will have a copy of "jre" for other apps etc, and then NetBackup has it's own. The two should never meet, and certainly the "jre" in the NetBackup "java" folder should not be messed with or modified.
Also, if you upgrade a master, media or client, then by the same token, you should also update all the other add-ons, e.g. Lotus Domin, MS SQL, MS Exchange "database options" etc etc and also, if you use it, the NetBackup Java Admin Console. You can't expect a base "GA" (General Availability) NetBackup Java Admin Console to work with a NetBackup server that has been updated to a "MPn" level. How is the older Java Console supposed to know what to do with any new features/protocols in something that is a higher version...