Install Oracle Java jdk

Install Oracle Java 

## Change the number 8 to 6 (or 7) in the code to install Java 6 (or 7)

    sudo add-apt-repository ppa:webupd8team/java

    sudo apt-get update

    sudo apt-get install oracle-java8-installer

    sudo apt-get install oracle-java8-set-default

    java -version

## Set JAVA HOME path: sudo vim /etc/profile.d/oraclejdk.sh, and add the following config

    export J2SDKDIR=/usr/lib/jvm/java-8-oracle

    export J2REDIR=/usr/lib/jvm/java-8-oracle/jre

    export PATH=$PATH:/usr/lib/jvm/java-8-oracle/bin:/usr/lib/jvm/java-8-

        oracle/db/bin:/usr/lib/jvm/java-8-oracle/jre/bin

    export JAVA_HOME=/usr/lib/jvm/java-8-oracle

    export DERBY_HOME=/usr/lib/jvm/java-8-oracle/db