Gunzip /Applications/Minecraft.app/Contents/MacOS/JavaApplicationStub.gz If everything goes wrong, here's how to roll back from here to your original configuration: rm /Applications/Minecraft.app/Contents/MacOS/JavaApplicationStub Then, add 64-bit architecture to Minecraft's possibilities: /usr/libexec/PlistBuddy -c 'Add :Java:JVMArchs:0 string 'x86_64'' /Applications/Minecraft.app/Contents/ist Swap out Minecraft's JavaApplicationStub for the current OS' version: gzip /Applications/Minecraft.app/Contents/MacOS/JavaApplicationStub # save a backupĬp /System/Library/Frameworks/amework/Versions/Current/Resources/MacOS/JavaApplicationStub /Applications/Minecraft.app/Contents/MacOS/ I had a few tabs open, while I was sussing this out, including an excellent forum post, a post on JavaApplicationStub bits, and the official reference for CF keys. These instructions assume the default Minecraft.app location, in the main /Applications folder. These instructions were crafted on MacOS Lion, which should prefer 64-bit Java when possible (Applications/Utilities/Java Preferences). So you're a slave to warning messages and you want Minecraft to use 64-bit Java.

Java 64 bit minecraft