I'm not sure I fully understand your question.
If you are saying that there is an MSI in that jre that you want to find the commandline it was run with, try this:
go to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer
Add a string called logging, set its value to microwaveup
Add a dword called debug, set its value to 7
run the jre install on your test box and when its done, go to your %temp% folder, find the newest file called MSIxxx.log and one of the 1st lines will tell you its commandline
looeee