Base on post from digitalocean.com
wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-x64.tar.gz
sudo su
mkdir /opt/jdk
tar -zxf jdk-8u5-linux-x64.tar.gz -C /opt/jdk
Setting Oracle JDK as the default JVM
update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_05/bin/java 100 update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.8.0_05/bin/javac 100
update-alternatives --display java update-alternatives --display javac
java -version