Removing the "system" JVM installed and maintained by Software Update

• Uninstalling Java 6 to replace with newer version of Java

    $ sudo rm -rf /System/Library/Java/JavaVirtualMachines/1.6.0.jdk

• Remove any Java Developer Previews

    $ sudo rm -rf /System/Library/Java/JavaVirtualMachines/1.6.0.jdk

Installing Legacy Java 6 runtime

• If you need to use Java for OS X 2017-001, install the Legacy Java

Installing Java and adding JAVA_HOME

• Download Java from https://www.java.com/en/download/
• NOTE: To run Java 8 from the Terminal when using java -version, you need to install the JDK not JRE

Install latest version of Java

Once you have installed Java, you should be able to type Java on the Terminal to get an output like -

    $ Java
    Usage: java [-options] class [args...]
            (to execute a class)
    or  java [-options] -jar jarfile [args...]
            (to execute a jar file)
    where options include:
        -d32	  use a 32-bit data model if available
        -d64	  use a 64-bit data model if available
        -server	  to select the "server" VM
                    The default VM is server,
                    because you are running on a server-class machine. a server-class machine.
    ......

Simple approach --> Entries in .bash_profile

    # JAVA
    export JAVA_HOME=$(/usr/libexec/java_home)
    export PATH=${PATH}:${JAVA_HOME}/bin

• In Mac OSX 10.5 or later, Apple recommends to set the $JAVA_HOME variable to /usr/libexec/java_home
• Just export '$JAVA_HOME' in file '/. bash_profile' or '/.profile'
• Additional reading references
  • See http://www.mkyong.com/java/how-to-set-java_home-environment-variable-on-mac-os-x/
• You can also use explicit setting like export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)

Other options

• Java will be installed in folder mentioned below. Find the right director / Java version to be used.

    $ ls /Library/Java/JavaVirtualMachines/

• Adding JAVA_HOME in bash

    $open -e .bash_profile 

• Add following two options. First uses symbolic link, other is absolute path

    # Option 1
    export JAVA_HOME=$(/usr/libexec/java_home)

    # Option 2
    export JAVA_HOME=”/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home”

Reload the .bash_profile

    $ source .bash_profile

Check the JAVA_HOME setting

     $ echo $JAVA_HOME
    /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home

• Check is synlink to Java is working

    $ /usr/libexec/java_home -V 
    Matching Java Virtual Machines (1):
    1.8.0_31, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home

    /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home

Check if Java is working by issuing two commands mentioned below:

    $ java -version
    java version "1.8.0_60"
    Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
    Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

    $ echo $JAVA_HOME 
    /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home

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Note: If you like the instructions here, please refer it on your posts/documentation. Contact me if there are corrections needed.