Java Environment Setup in Linux Ubuntu with apt-get

This article explains about how to setup Java in Linux Ubutu operating system. To setup Java in Windows environment follow instruction given in following link Java Environment Setup in Windows

Install Java

First of all, you need to add webupd8team Java PPA repository in your system. After that install, Oracle Java 8 using following a set of commands.

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer

Verify Installed Java Version

After successfully installing Oracle Java using above step verify installed version using the following command.

$ java -version

java version "1.8.0_144"

Java(TM) SE Runtime Environment (build 1.8.0_144-b01)

Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

Java Environment Variable

Also, install Java configuration package. It seems like below package is already installed with latest operating systems during installation of JAVA packages. But you can still make sure by running below command.

$ sudo apt-get install oracle-java8-set-default

Now add the JAVA_HOME and JRE_HOME environment variable in /etc/environment configuration file using following command.

$ cat >> /etc/environment <<EOL
JAVA_HOME=/usr/lib/jvm/java-8-oracle
JRE_HOME=/usr/lib/jvm/java-8-oracle/jre
EOL

Test it by executing:

echo $JAVA_HOME

If it returns the just set path, the environment variable has been set successfully. If it doesn't, please make sure you followed all steps correctly.