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How to Set $JAVA_HOME environment variable on Mac OS X

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1. Mac OSX 10.5 or later

In Mac OSX 10.5 or later, Apple recommends to set the $JAVA_HOME variable to /usr/libexec/java_home, just export$JAVA_HOME in file ~/. bash_profile or ~/.profile.

Bash

$ vim .bash_profile 

export JAVA_HOME=$(/usr/libexec/java_home)

$ source .bash_profile

$ echo $JAVA_HOME

/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home

Why /usr/libexec/java_home?

This java_home can return the Java version specified in Java Preferences for the current user. For examples,

Bash

/usr/libexec/java_home -V

Matching Java Virtual Machines (3):

    1.7.0_05, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home

    1.6.0_41-b02-445, x86_64: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

    1.6.0_41-b02-445, i386: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

This Mac OSX has three JDK installed.

Bash

##return top Java version

$ /usr/libexec/java_home

/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home

## I want Java version 1.6

$ /usr/libexec/java_home -v 1.6

/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

2. Older Mac OSX
For older Mac OSX, the /usr/libexec/java_home doesn’t exists, so, you should set JAVA_HOME to the fixed path :

Bash
$ vim .bash_profile

export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

$ source .bash_profile

$ echo $JAVA_HOME
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home


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