===== Install Java =====

Oracle Java 11 has introduced a new, commercial license. It can be downloaded and used without cost only for development and testing. It requires paying a fee if it is used in production. As a result, you should only use Oracle JDK if you intend to pay for it. Oracle JDK builds and OpenJDK builds are essentially identical with a few differences that you can read about [[https://blogs.oracle.com/java-platform-group/oracle-jdk-releases-for-java-11-and-later|here]]. The JRE is no longer a product and only the JDK will be offered going forward.

So instead of having a single JDK build from Oracle, which can be used either commercially (paid support) or for free (which many of us were doing), they now have two different JDK builds:

[[#oracle_jdk|Oracle's JDK (commercial)]] — you can use this in development and testing for free, but if you use it in production, you have to pay for it
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[[#openjdk|Oracle's OpenJDK (open source)]] — you can use this for free in any environment, like any open source library.

==== OpenJDK ====

Ubunutu 18.10 has the OpenJDK 11 package in the Ubuntu repositories. Earlier versions of Ubuntu and Linux Mint actually have OpenJDK 10 packaged as the "OpenJDK 11" package. To install the OpenJDK 11 version of Java into all versions of Ubuntu and Linux Mint, use the official Ubuntu PPA:<code bash>
sudo add-apt-repository ppa:openjdk-r/ppa -y

sudo apt update

sudo apt install openjdk-11-jdk -y
</code>

If you only need the Java JRE, you can install the ''openjdk-11-jre'' package:<code bash>
sudo apt install openjdk-11-jre -y
</code>

==== Oracle JDK ====

If you decide to install the commercial version of Java, you will need to first remove any installed Open JDK packages:<code bash>
sudo apt purge openjdk*
</code>


On Ubuntu or Linux Mint, add the following PPA that hold the scripts to download and install the commercial licensed version:<code bash>
sudo add-apt-repository ppa:linuxuprising/java -y

sudo apt update
</code>

On Debian, which prevents "non-free" software, you can manually add the repository with:<code bash>
echo "deb http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic main" | tee /tmp/linuxuprising-java.list

sudo cp /tmp/linuxuprising-java.list /etc/apt/sources.list.d/

sudo apt install  dirmngr -y

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 73C3DB2A

apt update
</code>

Finally, Install Java with the following commands:<code bash>
echo oracle-java11-installer shared/accepted-oracle-license-v1-2 select true | sudo /usr/bin/debconf-set-selections

sudo apt install oracle-java11-installer -y

sudo apt install oracle-java11-set-default
</code>


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Once one of the versions of Java is installed, you can verify that Java is installed with:<code bash>
java -version
</code>


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Last Updated: January 10, 2019