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• An Intel Mac
• RAM: 1GB
• OS: Mac OS X 10.67.8, 0 or 10.76.08, or later
  • Java: "Java for Mac OS X 10.7" or "Java for Mac OS X 10.6 Update 5" on 10.6 only

TL;DR

1. Download an unofficial build
2. Open /Applications/Utilities/Java Preferences.app
3. Drag both "OpenJDK 7" entries to the top of the list
4. Run "java -version" in /Applications/Utilities/Terminal.app

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• Hardware: Any 64-bit capable Intel Mac
  • RAM: 4GB, 2GB min
• OS: Mac OS X 10.7
  • Xcode: 4.1 or later from the Mac App Store (free download)
  • Java: "Java for Mac OS X 10.7" ("java -version" to trigger install)
• OS: Mac OS X 10.6, run Software Update to get to at least 10.6.8
  • Xcode: 3.2.6 or later from http://connect.apple.com (Developer Tools section)
  • Java: "Java for Mac OS X 10.6 Update 5" or later from Software Update or http://connect.apple.com (Java section)
  OS: Mac OS X 10.7
  • Xcode: 4.1 or later from the Mac App Store (free download)
• Mercurial: http://mercurial.berkwood.com/
• Jtreg: http://openjdk.java.net/jtreg/

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