Where is JAVA_HOME?

findJavaHome.sh

#!/bin/bash

function whereIsFile() {
    pushd . > /dev/null
    FILE_PATH=$1;
    while([ -h "${FILE_PATH}" ]) do cd -P $(dirname "${FILE_PATH}"); FILE_PATH=$(readlink "${FILE_PATH}"); done
    cd -P $(dirname "${FILE_PATH}") > /dev/null
    echo $(pwd)
    popd >/dev/null
}

JAVA_HOME=$(dirname $(dirname $(whereIsFile $(which java))))
echo $JAVA_HOME