Install Oracle Java 8 in Debian via Repo

To add the WebUpd8 Oracle Java PPA repository and install Oracle Java 8 in Debian, use the following commands:
echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee /etc/apt/sources.list.d/webupd8team-java.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
apt-get update
apt-get install oracle-java8-installer

And that's it, Oracle Java 8 should now be installed and you should get automatic updates for future Oracle Java 8 versions, under Debian.

You can check out the Java version on your system by using these commands:
java -version

There is a package in repository that automatically sets the Java 8 environment variables and sets JDK8 as the default JDK. To install it, use the following command:
apt-get install oracle-java8-set-default
source /etc/profile.d/jdk.sh