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Java Versioning

Radar #4030615

The current JDK and JRE after installing J2SE 5.0 Release 1

Description:

Java 1.4.2 remains the current JDK and JRE after installing J2SE 5.0 Release 1.

Resolution:

This allows applications built for Java 1.4.2 to continue running in Java 1.4.2.

To use the J2SE 5.0 version of any command-line Java utility, such as java or javac, specify the full path to the J2SE 5.0 version of the command. This usually means prepending the command with the path /System/Library/Frameworks/JavaVM.framework/Versions/1.5/.

The JVMVersion Info.plist key allows you to specify which JVM your application uses. Using either the 1.3+, 1.4+, or 1.5+ keys results in the VM being used according to a precedence list set in the Java Application Settings portion of the Java Preferences application, found in /Applications/Utilities/Java/J2SE 5.0. By default in J2SE 5.0 Release 1, the precedence list follows this order:

J2SE 1.4.2

J2SE 5.0

Though not listed, Java 1.3.1 is considered to be the last entry on the list.

This works by trying to match the given key versus VM versions in the list:

• Having 1.4+ specified first matches the “J2SE 1.4.2” value, so that is the VM used. Specifying 1.5+ means that 1.4.2 is skipped and the next choice, “J2SE 5.0,” is used.

• If a user switches these values so that “J2SE 5.0” is first, an application that specifies 1.4+ runs in J2SE 5.0, since it’s the first entry and numerically superior to J2SE 1.4.2.

Table 1-1 lists the possible combinations of values when working with JVMVersion values and the Java Version Precedence List found in Java Preferences.

You can specify a specific version of Java as your JVMVersion key (such as 1.4.2 or 1.5.0), but if that precise version is not installed on the system, your application will fail to launch. This is not recommended.

To use an applet in Safari using J2SE 5.0, use the Applet portion of the Java Preferences application, found in /Applications/Utilities/Java/J2SE 5.0, to select J2SE 5.0 as the virtual machine for applets.

For information on configuring Xcode projects for use with J2SE 5.0, read “Radar #4090917.”

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