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Comment: Added information about the version of Java on Tiger.

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The following assumes you have Java already installed - it should be installed by default on every MacOS X installation. Note that MacOS X 10.2 (Jaguar) comes with Java 1.3; MacOS X 10.3 (Panther) comes with Java 1.4. Presumably, MacOS X 10.4 (Tiger) uses comes with Java 1.4.2 installed, but Java 1.5 can be downloaded. It is possible to run Java 1.4 on MacOS X Jaguar but it may interfere with operation of the standard environment.

Verify the following paragraph! This explanation, however, should be right, or nearly so.
JAVA_HOME is at /Library/Java/Home, but this is a link into a directory /System/Frameworks/JavaJVMFrameworkJavaJVM.Framework/Versions which is used to switch between versions easily. There is a link Current and CurrentVersion which matches up the current Java environment with the appropriate version.

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