java_home environment variable


Windows

N/A

OS X

installations

$ ls -l /Library/Java/JavaVirtualMachines/
....
$

/usr/libexec/java_home

$ /usr/libexec/java_home
/Library/Java/JavaVirtualMachines/jdkx.y.z_mm.jdk/Contents/Home

$ /usr/libexec/java_home -v 1.8
/Library/Java/JavaVirtualMachines/jdk1.8.0_mm.jdk/Contents/Home

$ /usr/libexec/java_home -v 1.7
/Library/Java/JavaVirtualMachines/jdk1.7.0_mm.jdk/Contents/Home

~/.profile

$ cat ~/.profile
...
export JAVA7_HOME=$(/usr/libexec/java_home -v 1.7)
export JAVA8_HOME=$(/usr/libexec/java_home -v 1.8)
export JAVA_HOME=$JAVA8_HOME
...

$ echo $JAVA7_HOME
/Library/Java/JavaVirtualMachines/jdk1.7.0_75.jdk/Contents/Home

$ echo $JAVA8_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home

$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home

$

Ubuntu

See installing latest oracle jdk in old ubuntu.

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