Installing Oracle JDK on Debian or Ubuntu systems

Steps for installing the Oracle JDK on Debian-based systems.

Configure your operating system to use the latest version of Oracle Java Platform, Standard Edition 8.

The Oracle Java Platform, Standard Edition (JDK) has been removed from the official software repositories of Ubuntu and only provides a binary (.bin) version. You can get the JDK from the Java SE Downloads.

Procedure

Check which version of the JDK your system is using:

java -version

If Oracle Java is used, the results should look like:

java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)

If necessary, go to Oracle Java SE Downloads, accept the license agreement, and download the installer for your distribution.

Note: If installing the Oracle JDK in a cloud environment, accept the license agreement, download the installer to your local client, and then use scp (secure copy) to transfer the file to your cloud machines.
Make a directory for the JDK:
```
sudo mkdir -p /usr/lib/jvm
```
Unpack the tarball and install the JDK:
```
sudo tar zxvf jdk-8u65-linux-x64.tar.gz -C /usr/lib/jvm
```
The JDK files are installed into a directory called /usr/lib/jvm/jdk-8u_version.
Tell the system that there's a new Java version available:
```
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_version/bin/java" 1
```
If updating from a previous version that was removed manually, you many need to execute the above command twice, because you'll get an error message the first time.
Set the new JDK as the default using the following command:
```
sudo update-alternatives --config java
```

Make sure your system is using the correct JDK:

java -version

java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)