How to Download and Install Oracle JAVA 8 on Ubuntu 18.04/16.04 LTS

In this article, We are going to perform How to Download and Install Oracle JAVA 8 on Ubuntu 18.04/16.04 LTS Manually.

Introduction

Java is a set of software and specifications developed at Sun Microsystems. There are two tyes of Java Platforms are JDK (Java Development Kit) and JRE (Java Runtime Environment). Both are helpful for deploying applications on servers and debugging, JVM monitoring,developing.

Java 8 Features:

Java 8 provides following features,

  • ForEach() method
  • Functional interfaces
  • Base64 Encode Decode
  • Parallel array sorting
  • Nashorn JavaScript Engine,
  • Parallel Array Sorting
  • Type and Repating Annotations
  • java.lang and java.util Packages

To know more detailed features go through this link.

Prerequisites

  • Ubuntu Server 16.04/18.04 LTS
  • SSH access with sudo privileges

To check Ubuntu version:

$ uname -a

OR

$ cat /etc/os-release

Output:

$ cat /etc/os-release

NAME="Ubuntu"
VERSION="16.04.5 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.5 LTS"
VERSION_ID="16.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

Follow the below steps to Install Oracle Java 8 on Ubuntu Manually using command line.

Step 1: Download Oracle Java 8

Generally Oracle will not allow to download directly without accepting their licences. We have to create one account in Oracle java website by your personal or official mail. After accepting licence download the application from browser to local machine.

This link takes you to the Oracle home website Oracel Java SRE.

Once you opened above link goto “JAVA SE Development Kit 8u221” section, click on “Accept License Agreement” Radio button and download “jdk-8u211-linux-x64.tar.gz” setup for ubuntu.

download-jdk-8

After downloading into local machine,using scp/SFTP/FTP transfer the file from local machine to Ubuntu server.

Step 2: Copy downloaded Setup and Extract

Run below command to run as sudo user:

# sudo su

Create a directory:

# mkdir /opt/jdk

Copy the tar  file from the directory copied from local machine to server to /opt/jdk folder and execute below command:

# cp -rf /home/sivasai/jdk-8u211-linux-x64.tar.gz /opt/jdk/
# cd /opt/jdk/
# tar -zxf jdk-8u211-linux-x64.tar.gz

Now unarchived the file and check the content by long-list:

# ls

Step 3: Install Oracle Java 8 on ubuntu with Alternatives

Use update-alternatives command to configure java on your system
# update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_211/bin/java 100
After executing above command it shows below output:
 
Output:
 
update-alternatives: using /opt/jdk/jdk1.8.0_211/bin/java to provide /usr/bin/java (java) in auto mode

Note : Its not particularly o/p if you have installed open jdk before

Step 4: Verify Update Alternatives

Enter below command shows output:
# update-alternatives --display java
Output:
 
java - auto mode
  link best version is /opt/jdk/jdk1.8.0_211/bin/java
  link currently points to /opt/jdk/jdk1.8.0_211/bin/java
  link java is /usr/bin/java
/opt/jdk/jdk1.8.0_211/bin/java - priority 100
/opt/jdk/jdk1.8.0_211/bin/javac - priority 100
To change for alternative mode:
# update-alternatives --config java
It prompts for selecting by 0,1,2..so choose accordingly:
Output
 
 There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                             Priority   Status
------------------------------------------------------------
* 0            /opt/jdk/jdk1.8.0_211/bin/java    100       auto mode
  1            /opt/jdk/jdk1.8.0_211/bin/java    100       manual mode
  2            /opt/jdk/jdk1.8.0_211/bin/javac   100       manual mode

Press <enter> to keep the current choice[*], or type selection number:

Step 5: Setting the JAVA_HOME and JRE_HOME Environment Variables

To define the enviroment variable:
# vi /etc/environment
Paste the below varible on the file:
JAVA_HOME=/opt/jdk/jdk1.8.0_211
JRE_HOME=/opt/jdk/jdk1.8.0_211/jre
To check variables defined:
# source /etc/environment
# echo $JAVA_HOME
Output:
 
/opt/jdk/jdk1.8.0_211
# apt-get update

Step 6: Verify Java Version

To check the java version:
# java -version
Output:
 
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
If you seeing output like above then we have  successfully set up the Java 8 on Ubuntu.
 

Conclusion

In this article, We have downloaded Oracle Java 8 from official site, installed using command line, configured JAVA_HOME and JRE_HOME, verified installed version.

Related Articles:

How to Install MySQL 5.7 on Ubuntu 16.04

 

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