Easy guide on how to install Java on Ubuntu systems

Java is a high level programming language that is being used for a large number of applications & is installed on large number of servers/systems. We have already covered how we can install java on CentOS/RHEL systems . In this tutorial , we are going to discuss how to install Java on Ubuntu systems.

With Ubuntu, we have option to either use the default Ubuntu’s java , which is recommended if you are not sure which java to use or we can also use Oracle’s java. We will check how to install java on Ubuntu for both the java types. So let’s start……

(Recommended Read: Installing JAVA 7 & 8 on Centos/RHEL 7)

(Also Read: Step by Step guide for Wildfly 10 (10.1.0) installation)

Installing Default Ubuntu Java

For installing the default version of Ubuntu’s java, we need not add any repositories as the package has been provided with the default Ubuntu’s repo. To install it, simply open terminal & execute the following command,

$ sudo apt-get update

For installing JRE only,

$ sudo apt-get install default-jre

To install Java JDK (it includes JRE also), run the following command,

$ sudo apt-get install default-jdk

This is the easiest way to install java on Ubuntu systems. Now let’s discuss the installation for Oracle java.

Installing Oracle JDK

For installing Oracle JDK, we firstly need to add a repository for the same,

$ sudo add-apt-repository ppa:webupd8team/java

Than update the repo on the system,

$ sudo apt-get update

We can now install the latest version of Java using the following command,

$ sudo apt-get install oracle-java8-installer

Similarly, if need to install java 7 run the following command,

$ sudo apt-get install oracle-java7-installer

Or for installing java 9, execute the following command from terminal,

$ sudo apt-get install oracle-java9-installer

After installation you can check the installed java version by running the following command,

$ java --version

Setting Java’s Environment Variable

Next step is to set the java environment variables. To do this, open the file ‘.bashrc’ from your home folder,

$ sudo nano ~/.bashrc

& add the following content,

JAVA_HOME=/usr/java/jdk1.8.0_151        # change the path as per the installed java version

PATH=$JAVA_HOME/bin:$PATH

Save the file & exit. That’s it on our tutorial on how to install java on the Ubuntu systems.

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