Well, I made it a little easier to use an alternate Java. If you define an environment variable called SPINE_JAVA, it will use that when Spine.app is run. To use the system Java, you'd set it to "java" (without quotes). Eg, from the command line...
export SPINE_JAVA=java
open Spine.app
There are various ways to set environment variables in OS X:
http://stackoverflow.com/questions/1356 ... es-in-os-x
You can use the RCEnvironment tool if you want a GUI for doing it:
http://www.rubicode.com/Software/Bundle ... nvironment