If you want to try that, go ahead. However, since its components are scattered about the volume, tracking down any missing thing is, IMO, an exercise in futility. Reinstalling ensures that all the components are put back and the update ensure that you have the latest ones. For a normal installation, the whole process takes less than thirty minutes. Less time than we've spent on a fix.
So, here's my situation. I've installed a network backup client (Connected for Macintosh) and I get a Java error when I try to run it. Their tech support said first that it didn't work because I only had the 32-bit component of J2SE 6. So I went to another Snow Leopard machine, fresh out of the box, that had both 32-bit and 64-bit components of J2SE 6. Still didn't work. Now they're saying it's because version 6 is not supported by their client, and I need J2SE 5.
I tried installing various of the downloads available on the Apple servers, and all except the J2SE 6 versions said they couldn't install on Snow Leopard.
So my question has now become: is there a way to install J2SE 5 in Snow Leopard?
The problem app is Iron Mountain's Connected Backup.
So, after all the BS you got from the Iron Mountain's tech support, they finally admit that their app needs to run the now obsolete J2SE 5 version. Amazing! See http://wiki.oneswarm.org/index.php/OSX_10.6_SnowLeopard for details on reinstalling the earlier version.
Tried oneswarm's directions on two systems. The results, according to what shows in Java Preferences, looked promising, in that all the versions of J2SE 5 and 6 appear.
This is not something I would want to have to tell paying customers to do, even if it worked, which, in the end, it didn't.
So, are you saying that you can select the various 5 & 6, 32- and 64-bit versions, but that the backup app still doesn't work? If so, then putting this ball back into the vender's court is appropriate. Alternatively, you or management might want to revisit your backup strategy. Iron Mountain can't be the only one out there.
This is a solution we've used for years with Windows boxes. They only recently announced Mac support. We're predominantly Windows, with a few Macs interspersed here and there. Long story short, new IT management is stirring things up. A lot. This is one of the items getting stirred: backup for the few Macs in upper management of the university.