Step-by-step – Oracle JDK 8 Installation in Ubuntu 20.04 Guide

Installing

2. 2. Downloading Oracle JDK

   Download Oracle Java SE JDK8 for Linux.

   Oracle JDK8 i586/x8664 tar.gz

   Oracle Jdk8

3. 3. Extracting Oracle JDK

   Double-Click on the tar.gz Archive and Extract into
   /tmp
   Or from Shell:

   tar xvzf ~/Downloads/jdk-8*.tar.gz -C /tmp/

   

4. 4. Setting Up Oracle JDK

   Then to Setup Oracle JDK 8.

   First, make a jvm Directory if Not already there with:

   sudo su -c 'if [ ! -d "/usr/lib/jvm" ]; then mkdir /usr/lib/jvm; fi'

   Set the root superUser as owner:

   sudo chown -R root:root /tmp/jdk1.8*

   Reiterate the Execution Permission over the Java binaries:

   sud chmod -R +x /tmp/jdk1.8*/bin

   Finally, Shift the Java contents with:

   sudo mv /tmp/jdk1.8* /usr/lib/jvm/

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

5. 5. Installing Oracle JDK

   Then to Install Oracle Java JDK 8
   You can directly Copy & Paste the Commands into Terminal…
   Execute this Sequence of Commands:

   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8*/bin/java 1065
   

   update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.8*/bin/javac 1065
   

   update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.8*/bin/jar 1065
   

   update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.8*/bin/javaws 1065
   

   Checking or Setting the System Java Version in Use with

   update-alternatives --config java
   

   Finally, to Switch of Java Version Just Enter the Selection Number on First, Column. :)

6. 6. Setting Up Environment

   (Optional) Setting JAVA_HOME User Environment Variable
   Edit the Bash environment Configuration file:

   nano $HOME/.bashrc

   And Append:

   export JAVA_HOME=/usr/lib/jvm/jdk1.8[uX]

   Replace the [uX] Looking for the Installed Java 8 Version with:

   ls /usr/lib/jvm/

   Ctr+x to Save & Exit from nano Editor :)
   Load New Bash Config:

   bash

7. 7. Testing Oracle JDK

   Finally, Test Java JDK 8 Installation
   By:

   java -version

Java 8 IDEs Installation on Ubuntu

How to Install Eclipse for Java 8 Development on Ubuntu: Installing Eclipse IDE for Java 8 on Ubuntu.

How to Install Netbeans 8 IDE for Java on Ubuntu: Installing NetBeans IDE for Java Development on Ubuntu.

How to Install IntelliJ IDEA 2024 for Java Dev on Ubuntu: Installing IntelliJ IDEA for Java on Ubuntu.

Now Thanks to Oracle-Sun Corporation you are able to Successfully Start Up with Java 8 Development.

Welcome to Java 8 Challenge! ;)