In this article, We are going to perform How to Download and Install Oracle JAVA 12 on Ubuntu 18.04/16.04 LTS Manually or any other cloud platform like Amazon Ec2, Azure VM, Google Cloud Compute,etc. with preinstalled Ubuntu OS.

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.

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:

NAME="Ubuntu"

VERSION="18.04.3 LTS (Bionic Beaver)"

ID=ubuntu

ID_LIKE=debian

PRETTY_NAME="Ubuntu 18.04.3 LTS"

VERSION_ID="18.04"

HOME_URL="https://www.ubuntu.com/"

SUPPORT_URL="https://help.ubuntu.com/"

BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"

PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"

VERSION_CODENAME=bionic

UBUNTU_CODENAME=bionic 

Follow the below steps to Install Oracle Java 12 on Ubuntu Manually using command line.

Step 1: Download Oracle Java 12

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 12.0.2” section, click on download “jdk-12.0.2_linux-x64.bin.tar.gz”  and “Accept License Agreement” and setup for ubuntu.

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

Create a directory /opt/jdk

$ sudo mkdir -p /opt/jdk

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

$ sudo cp -rf /home/fosstechnix/jdk-12.0.2_linux-x64_bin.tar.gz /opt/jdk

Navigate to /opt/jdk directory

$ cd /opt/jdk/

Extract the Oracle Java 12 setup

$ sudo tar -zxf jdk-12.0.2_linux-x64_bin.tar.gz

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

# ls

Step 3: Install Oracle Java 12 on ubuntu with Alternatives

Use update-alternatives command to configure java on your system

$ sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk-12.0.2/bin/java 2

After executing above command it shows below output:

Output:

 update-alternatives: using /opt/jdk/jdk-12.0.2/bin/java to provide /usr/bin/java (java) in auto mode

Now set default java 12

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

Step 4: Verify Update Alternatives

Enter below command shows output:

$ sudo update-alternatives --display java

Output:

java - auto mode  link best version is /opt/jdk/jdk-12.0.2/bin/java  link currently points to /opt/jdk/jdk-12.0.2/bin/java  link java is /usr/bin/java/opt/jdk/jdk-12.0.2/bin/java - priority 2

Set the default Oracle Java 12 using below command

$ sudo update-alternatives --config java

It prompts for selecting by 0,1,2..so choose accordingly, if you have already installed any oracle java.

Here I have not installed any other oracle java version, so I am getting output like below.

Output

 sudo update-alternatives --config javaThere is only one alternative in link group java (providing /usr/bin/java): /opt/jdk/jdk-12.0.2/bin/javaNothing to configure.

Step 5: Setting the JAVA Environment Variables

To set JAVA environment variables, create a new file under /etc/profile.d directory.

$ sudo nano /etc/profile.d/javajdk.sh

Paste the below lines

export PATH=$PATH:/opt/jdk/jdk-12.0.2/bin

export JAVA_HOME=/opt/jdk/jvm/jdk-12.0.2/

export J2SDKDIR=/opt/jdk/jvm/jdk-12.0.2/

To Load environment variables, Enter below command,

$ source /etc/profile.d/javajdk.sh

Step 6: Verify Java Version

To check the java version:

$ java -version

Output:

java version "12.0.2" 2019-07-16

Java(TM) SE Runtime Environment (build 12.0.2+10)

Java HotSpot(TM) 64-Bit Server VM (build 12.0.2+10, mixed mode, sharing) you seeing output like above then we have  successfully set up the Java 12 on Ubuntu.

Conclusion

In this article, We have have covered install oracle java 12 on Ubuntu, downloaded Oracle Java 12 from official site, installed using command line, configured JAVA_HOME and JRE_HOME, verified installed version.

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