Mac Java FAQ: I'm currently using Mac OS/X 10.4 with Java 1.5.x. But, for a certain application I need to use a previous version of Java, which I can see is actually installed on the hard drive. Can I use this older Java JVM on Mac OS X 10.4?
Answer: Yes, I was able to do this. The hardest part about this is finding where the previous Java version is installed. There are probably easier ways to do it, but I ended up using the Mac
mdfind command, which is the command-line version of Spotlight.