find-java-home

UNIXTYPE=$(uname -s | tr "[A-Z]" "[a-z]")
if [ $UNIXTYPE = "freebsd" ]; then
    if [ -d /usr/local/openjdk8 ]; then
        JAVA_HOME="/usr/local/openjdk8"
    elif [ -d /usr/local/openjdk7 ]; then
        JAVA_HOME="/usr/local/openjdk7"
    elif [ -d /usr/local/openjdk6 ]; then
        JAVA_HOME="/usr/local/openjdk6"
    fi
elif [ $UNIXTYPE = "sunos" ]; then
    UNIXTYPE="solaris"
    if [ -d /usr/jdk/latest/ ]; then
        JAVA_HOME="/usr/jdk/latest"
    elif [ -d /usr/jdk/instances/jdk1.8.0/ ]; then
        JAVA_HOME="/usr/jdk/instances/jdk1.8.0"
    elif [ -d /usr/jdk/instances/jdk1.7.0/ ]; then
        JAVA_HOME="/usr/jdk/instances/jdk1.7.0"
    elif [ -d /usr/jdk/instances/jdk1.6.0 ]; then
        JAVA_HOME="/usr/jdk/instances/jdk1.6.0"
    fi
elif [ $UNIXTYPE = "openbsd" ]; then
    if [ -d /usr/local/jdk-1.8.0 ]; then
        JAVA_HOME="/usr/local/jdk-1.8.0"
    elif [ -d /usr/local/jdk-1.7.0 ]; then
        JAVA_HOME="/usr/local/jdk-1.7.0"
    elif [ -d /usr/local/jdk-1.6.0 ]; then
        JAVA_HOME="/usr/local/jdk-1.6.0"
    fi
elif [ $UNIXTYPE = "netbsd" ]; then
    if [ -d /usr/pkg/java/openjdk8 ]; then
        JAVA_HOME="/usr/pkg/java/openjdk8"
    elif [ -d /usr/pkg/java/openjdk7 ]; then
        JAVA_HOME="/usr/pkg/java/openjdk7"
    fi
elif [ $UNIXTYPE = "linux" ] && [ -e /etc/debian_version ]; then
    if [ -d /usr/lib/jvm/default-java ]; then
       JAVA_HOME="/usr/lib/jvm/default-java"
    fi
elif [ $UNIXTYPE = "linux" ] && [ -e /etc/arch-release ]; then
    if [ -d /usr/lib/jvm/java-8-openjdk ]; then
        JAVA_HOME="/usr/lib/jvm/java-8-openjdk"
    elif [ -d /usr/lib/jvm/java-7-openjdk ]; then
        JAVA_HOME="/usr/lib/jvm/java-7-openjdk"
    elif [ -d /usr/lib/jvm/java-6-openjdk ]; then
        JAVA_HOME="/usr/lib/jvm/java-6-openjdk"
    fi
elif [ $UNIXTYPE = "darwin" ]; then
    JAVA_HOME=$(/usr/libexec/java_home)
elif [ $UNIXTYPE = "gnu/kfreebsd" ]; then
    # Even though the kernel is FreeBSD's, the userland is GNU.
    # kFreeBSD has $JAVA_HOME/include/linux instead of $JAVA_HOME/include/*bsd
    UNIXTYPE="linux"
    # OpenJDK 7 is supported as of Debian Jessie
    if [ -d /usr/lib/jvm/java-8-openjdk-kfreebsd-amd64/ ]; then
        JAVA_HOME="/usr/lib/jvm/java-8-openjdk-kfreebsd-amd64"
    elif [ -d /usr/lib/jvm/java-8-openjdk-kfreebsd-i386/ ]; then
        JAVA_HOME="/usr/lib/jvm/java-8-openjdk-kfreebsd-i386"
    elif [ -d /usr/lib/jvm/java-7-openjdk-kfreebsd-amd64/ ]; then
        JAVA_HOME="/usr/lib/jvm/java-7-openjdk-kfreebsd-amd64"
    elif [ -d /usr/lib/jvm/java-7-openjdk-kfreebsd-i386/ ]; then
        JAVA_HOME="/usr/lib/jvm/java-7-openjdk-kfreebsd-i386"
    elif [ -d /usr/lib/jvm/java-gcj ]; then
        JAVA_HOME="/usr/lib/jvm/java-gcj"
    fi
fi

export JAVA_HOME UNIXTYPE