JAVA, JDK or JRE Installation on Linux

For many purpose we need to install the java on our System, It will help to give all snapshots together for installation. For more visit to official site click here

3 min readJun 16, 2018

There may be many ways and each individuals their own directory and path style to install the java on your Linux System but, I am going through common point of view.

Step 0: Update your System (Package Index)

$ sudo apt-get update
$ sudo apt-get dist-upgrade

Step 1: Download the JDK (Java Development Kit) Click here

From this site you may download the JDK of your own choice suitable to your system configurations.

For me it’s jdk-7u3-linux-i586.tar.gz downloaded in Downloads folder.

Step 2: Extract the .gz file by following command

$ tar -xvf ~/Downloads/jdk-7u3-linux-i586.tar.gz

Above command will make a directory named ~/Downloads/jdk1.8.0_161/

Step 3: Made a directory named java in /usr/share/ folder

You may install your java to any directory as you wish but, for me it’s /usr/share/ folder and as I told you it’s common structure followed by Developers, use following command to make directory in usr/share/.

$ sudo mkdir /usr/share/java

Step 4: Move the jdk1.8.0_161 folder to /usr/share/java folder.

$ sudo mv ~/Downloads/jdk1.8.0_161/ /usr/share/java/

Step 5: Create the Symbolic link of each jdk package by command update-alternatives as follows

$ sudo update-alternatives --install /usr/bin/java java /usr/share/java/jdk1.8.0_161/bin/java 1$ sudo update-alternatives --install /usr/bin/javac javac /usr/share/java/jdk1.8.0_161/bin/javac$ sudo update-alternatives --install /usr/bin/jar jar /usr/share/java/jdk1.8.0_161/bin/jar 1$ sudo update-alternatives --install /usr/bin/javaws javaws /usr/share/java/jdk1.8.0_161/bin/javaws 1$ sudo update-alternatives --install /usr/bin/javadoc javadoc /usr/share/java/jdk1.8.0_161/bin/javadoc 1

Step 6: JAVA Environment variable Setup

Java environment variable can be set by two way

1 Local or user level privileges by Bash Shell ( .bashrc file of home directory) .
2 Global or root level privileges in profile script

Step 6.1: Local Environment Variable Setup

$ nano ~/.bashrcAdd the following line to the bottom of script.#JAVA Environment Variable Setup.
export JAVA_HOME=/usr/share/java/jdk1.8.0_161/
export JDK_HOME=/usr/share/java/jdk1.8.0_161/bin:$PATH(OR)#JAVA HOME directory setup
export JAVA_HOME=/usr/share/java/jdk1.8.0_161
export PATH=$PATH:$JAVA_HOME/bin

Step 6.2: Global Environment variable Setup

Global environment variable can be set to profile by following command.

$ sudo su
[sudo] password for user: ***$ nano /etc/profile Add the following line to the bottom of script.#JAVA Environment Variable Setup.
export JAVA_HOME=/usr/share/java/jdk1.8.0_161
export PATH=$PATH:$JAVA_HOME/bin

Step 7: Test Your Installation

7.1 Open new terminal by Ctrl+Alt+T

7.2 java -version

Java version “1.8.0_171”
Java Runtime Environment (build 1.8.0_171–8u171-b11–0ubuntu0.17.10.1-b11)
Java 64-Bit Server VM (build 25.171-b11, mixed mode)

So, above steps will install the java on your system.

Note:- Sometimes when run java -version show error no such directory found /usr/share/…, This is because of some dependency of the 32 bit are missing.
then, hit following command..

$ sudo apt-get install libc6-i386

Open JDK Installation: Note Only for Linux

# Install Open Jdk.
$ sudo apt install openjdk-8-jre-headless

# Remove installed open jdk.
$ sudo apt-get remove openjdk-*

Thank You