How to install Oracle Java on Ubuntu 14.04? [duplicate]

I am using Ubuntu 14.04.1 LTS, x64 architecture, and I specifically need to install Oracle Java. Now I know there are some instructions on the website which I follow but the same website does not recognize it. Can any one please help me with some instructions? Thanks!

Using a PPA (Obsolete)

Note: WebUpd8 team's PPA has been discontinued with effective from April 16, 2019. Thus this PPA doesn't have any Java files. More information can be found on PPA's page on Launchpad. Hence this method no longer works and exists because of historical reasons.

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

Are PPA's safe to add to my system and what are some “red flags” to watch out for?

Also ensure your JAVA_HOME variable has been set to:

/usr/lib/jvm/java-8-oracle

For this you can use the following command (see step 3 of Manual Install to see how to make it permanent):

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

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-8u20-linux-x64.tar.gz);
• Extract it to somewhere;

• Move the extracted folder to /usr/lib/jvm. This is not required but it is the place where Java runtime software is installed, and where tools like IDE's may search for it:

  sudo mv /path/to/jdk1.8.0_20 /usr/lib/jvm/oracle_jdk8
  

• Before addin this jdk as an alternative, you can see that the new alternative is not listed:

  sudo update-alternatives --query java
  
  sudo update-alternatives --query javac
  

• Next, add the new jdk alternatives (2000 is the priority and feel free to pick a different number):

  sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/oracle_jdk8/jre/bin/java 2000
  
  sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/oracle_jdk8/bin/javac 2000
  

• Now you should see the new jdk listed and you can switch between the alternatives with this command:

  sudo update-alternatives --config java
  
  sudo update-alternatives --config javac
  

• 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
  

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