The change takes effect immediately, and can be confirmed on the command line with java -version. Since Java 1.5 is still the default on Leopard, open “Java Preferences” in /Applications/Utilities and reorder the list of JVMs so that “Java SE 6” is first in the list. Leopard on 64-bit IntelĪs long as your CPU is a Core 2 Duo or later, all that’s required is a quick preference change. With some hackery, it can still be installed on Tiger or 32-bit Leopard. You may not recall that several developer previews were released, and the last to retain Tiger compatibility was Java SE 6 R1 DP6 (download), which supplied a PowerPC and 32-bit Intel JVM. If you were using Macs back then, you may recall that Apple’s Java 6 was only officially released for Leopard on 64-bit Intel, and didn’t become the default JVM until Snow Leopard (at which point a 32-bit Intel version was also made available). 1.6) on Mac OS X Tiger and Leopard, both Intel and PowerPC. For another project, I found myself needing to install Java 6 (a.k.a.
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