Upgrading of JRE for Netbackup servers

Hi guys, we are running NBU 4.5_FP6 on Solaris 9. The server is running Java Runtime Environment 1.4.2 which is only on paid subscription for patches only.

We are required to upgrade the JRE for all servers to latest 1.6.13. Would like to know if anyone faced issues with NBU GUI after a JRE upgrade?

Thanks!