V7R1 to V7R3 upgrade, V7R2 contingecy plan - Java version differences , SSL, SSH

We've changed our V7 OS upgrade plans.
Plan is to upgrade from V7R1 to V7R3, with a V7R2 constancy plan.

My primary concerns are default Java version differences between the releases, SSL, and SSH.
What are the default Java versions for:
V7R1 - 1.6.0 32 bit.
V7R2 -
V7R3 -

We have several Java apps, some the Java version is hardcoded, others are based on the OS release level.

https://www.ibm.com/developerworks/community/wikis/home?lang=en#/wiki/IBM%20i%20Technology%20Updates/page/Java%20on%20IBM%20i
DSPJVMJOB
WRKJVMJOB

SSL and SSH will be another thread.

I'm still thinking how to come up with the V7R2 constancy plan, if apps start failing at V7R3, and 3rd party vendor cannot produce a timely fix.
Did anyone ever downgrade from V7R3 to V7R2?
Is it even an option?

Any thoughts from the group?

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx
http://www.pencor.com/