How to install Oracle Java on Ubuntu 14.04

Using a PPA

You can use WebUpd8 PPA (this will download the required files from Oracle and install JDK 8):

sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

Manual install

The tar.gz provided by Oracle don't have an actual installation process. You just extract those files to a location you want and add them to your path. So the process is the following:

• Download a .tar.gz from Oracle (here I will be using jdk-8u31-linux-x64.tar.gz);
• Extract it to somewhere;

     tar -xvf jdk-8u31-linux-x64.tar.gz (64-bit)

• Move the extracted folder to /usr/lib/jvm. This is not required but it is the place where Java runtime software is installed
  

  sudo mv /path/to/jdk1.8.0_31 /usr/lib/jvm/oracle_jdk8

• Create a file /etc/profile.d/oraclejdk.sh with the following content (adapt the paths to reflect the path where you stored your JDK):
  

  export J2SDKDIR=/usr/lib/jvm/oracle_jdk8
  export J2REDIR=/usr/lib/jvm/oracle_jdk8/jre
  export PATH=$PATH:/usr/lib/jvm/oracle_jdk8/bin:/usr/lib/jvm/oracle_jdk8/db/bin:/usr/lib/jvm/oracle_jdk8/jre/bin
  export JAVA_HOME=/usr/lib/jvm/oracle_jdk8
  export DERBY_HOME=/usr/lib/jvm/oracle_jdk8/db

• Make it executable:
  

  sudo chmod +x /etc/profile.d/oraclejdk.sh

Done! Those paths will only be recognized after logout or restart, so if you want to use them right away run source /etc/profile.d/oraclejdk.sh.