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设置Mac系统JAVA_HOME

· One min read
Alan

原文

设置Mac系统的JAVA_HOME环境变量:

  1. 打开终端
  2. 编辑 ~/.bash_profile
  3. 新增一行内容 export JAVA_HOME=$(/usr/libexec/java_home)
  4. 执行 source .bash_profile
  5. 测试: echo $JAVA_HOME

以下是原文​

In this tutorial, we show you how to set $JAVA_HOME environment variable on latest or older Mac OSX.

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.

$ 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,

/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.

    ##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

Ref: https://www.mkyong.com/java/how-to-set-java_home-environment-variable-on-mac-os-x/