Let’s see how to install java in Linux in just 3 steps. For java Development, you need a JDK and not JRE. There’s a huge difference between JRE and JDK. So when I say installing java in this tutorial, I mean installing JDK.

Installing java in Linux is quite simple. Follow the below steps:

Installing Java on Ubuntu, Mint, or other Debian based Distros

Usually, all distro comes with one default JDK set into their PPA hence all you need to do is just fire a single command and you will be good to go. But, before installing java first ensure whether you have on already.

which java

If it doesn’t return anything then you are good to go otherwise you already have java.

But in case it doesn’t return anything then open the terminal and fire the below command

sudo apt-get install default-jdk 

Sudo is required since the installation process requires the root’s permission.

To ensure whether java is installed or not, you fire below command

which java

It should return back path to your java file like below

/usr/bin/java

Or you can also ensure by running the below command

java -version

It should return the version of java installed.

Installing Java on Red Hat or Fedora

Like the above steps first, ensure whether you already have java. Run below command, if command doesn’t return anything then you don’t have java on your machine otherwise proceed from the next step

which java

If it doesn’t return anything then fire below command

sudo yum install java-1.8.0-openjdk

This should install java 8. In order to install java 11 on RedHat or fedora use below command

sudo yum install java-11-openjdk-devel

After installation is done, ensure installation by checking version of java using below command

java -version

Manually Installing java in any Linux distro

There could be an instance when the above-written way doesn’t work for some distros or may be just because you wanna have more command over your machine and you want to install java in your own way, then you’ll prefer the manual way.

Since many vendors provide JDK, first you’ll have to decide which one to use. I personally prefer Adoptopen JDK. Download the JDK,l whichever version you want and proceed to next step.

In Linux, we are supposed to install custom applications in /opt path. So we will also install java to this path.

use the below command to extract the tar file you just downloaded. you may also use the GUI

tar -xvf <path to java.tar.gz> -C /opt

The above command will create a directory in /opt directory which contains your JDK.

The next step is we need to set the JAVA_HOME variable.

We will do it via the .profile file. In case you don’t know what is .profile file in Linux, this file contains a shell script, which runs every time start a session in Linux (eg: when you open a terminal session, or simply login into your Linux machine)

So let’s say the installation directory of java is /opt/java-11, then at the very bottom of “.profile” add below line

export JAVA_HOME=/opt/java-11

JAVA_HOME variable is used by the various application which usage java.

The next step is adding java into the PATH vaariable

In linux there’s A common practice to create a soft link of all application file in /usr/bin, so we will also do it.

To create softlink to java fire below command

ln -s /opt/java-11 /usr/bin/java

If the above command fails with permission issue the use sudo before the command

Now let’s add this path to the PATH variable.

open .profile again and add below line at very bottom

export PATH=$PATH;/usr/bin/java

Java is talled. To verify, start a new terminal and fire below command

java -version

It should return the version which you had chosen to install.

In case you face any problem please leave a comment or mail on kumargauravgupta3@gmail.com

If you are already very comfortable in java and wanna proceed to an advanced level, Here’s my course on REST API using Spring boot

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