最近升級了MAC OS，裝了JDK7 for mac，在這里下載JDK7 for mac，裝完之后發現在默認的路徑下找不到JDK7的HOME，如下所示：

$ which java /usr/bin/java$ ls -l /usr/bin/java lrwxr-xr-x 1 root wheel 74 Jan 4 20:24 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java$ ls -l /System/Library/Frameworks/JavaVM.framework/Versions total 64 lrwxr-xr-x 1 root wheel 10 Jan 4 20:24 1.4 -> CurrentJDK lrwxr-xr-x 1 root wheel 10 Jan 4 20:24 1.4.2 -> CurrentJDK lrwxr-xr-x 1 root wheel 10 Jan 4 20:24 1.5 -> CurrentJDK lrwxr-xr-x 1 root wheel 10 Jan 4 20:24 1.5.0 -> CurrentJDK lrwxr-xr-x 1 root wheel 10 Jan 4 20:24 1.6 -> CurrentJDK lrwxr-xr-x 1 root wheel 10 Jan 4 20:24 1.6.0 -> CurrentJDK drwxr-xr-x 7 root wheel 238 Jan 4 20:25 A lrwxr-xr-x 1 root wheel 1 Jan 4 20:24 Current -> A lrwxr-xr-x 1 root wheel 59 Jan 4 20:24 CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents

可是查看java的版本確實是1.7，如下：

$ java -version java version "1.7.0_45" Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

google了一下，發現了這篇文章Important Java Directories on Mac OS X，可以使用工具命令“/usr/libexec/java_home”來定位JAVA_HOME，這下爽了：

$ cat ~/.profileJAVA_HOME=`/usr/libexec/java_home` export JAVA_HOME$ echo $JAVA_HOME /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home

另外可以使用-V選項列出所有版本的JAVA_HOME：

$ /usr/libexec/java_home -V Matching Java Virtual Machines (3):1.7.0_45, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home1.6.0_65-b14-462, x86_64: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home1.6.0_65-b14-462, i386: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home

原文地址：http://guibin.iteye.com/blog/1999238

新人創作打卡挑戰賽發博客就能抽獎！定制產品紅包拿不停！

總結

以上是生活随笔為你收集整理的(转)在MAC上查找和设置$JAVA_HOME的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。