Here's a well-written and detailed discussion about Minecraft & Java including Java order, the Minecraft start stub, etc:
Make sure to use the latest Java: Java for OS X Lion Update 1 (Java 1.6.0_29, updated 09. Nov.) Java for Mac OS X 10.6 Update 6 (Java 1.6.0_29, updated 09. Nov.) Java for Mac OS X 10.5 Update 10 (Java 1.6.0_26 on 64bit Intel, Java 1.5.0_30 last release for PPC) Java for Mac OS X 10.4, Release 9 (only supports Java 1.5.0_19)
At this point it's a good idea to open Java Preferences and check which versions of Java are installed and what the preferred run order is. Sort it so that Java 6 64bit is on top, then Java 6 32bit, Java 5 64bit, Java 5 32bit.
Within Info.plist (see paragraph 2), find the 'JVMVersion' key and change it to '1.6+'. The next step is to replace 'JavaApplicationStub' in
with the one found in
Use 'Show package contents' and 'Go to folder' (xe2x87xa7xe2x8cx98G) to find those places.
Most people experience improved performance when switching to 64bit. Add a key to 'JVMArchs' with the value 'x86_64' on top of the existing ones to run Java in 64bit if it is available. This step is optional but recommended.