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JAVA_HOME can be located using the tool command "/usr/libexec/java_home":
Targeting JAVA:
/usr/libexec/java_home -V Matching Java Virtual Machines (1): 1.8.0_25, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home
Alternatively use the -V option to list all versions of 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/Home 1.6.0_65-b14-462, x86_64: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home 1.6.0_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
Placement JAVA_HOME:
$ cat ~/.profile
JAVA_HOME=`/usr/libexec/java_home`
export JAVA_HOME
$ echo $JAVA_HOME /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home
$ source ~/.profile $java
JAVA_HOME=$(/usr/libexec/java_home-v1.7)
export JAVA_HOME
Find and set $JAVA_HOME on MAC
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