In this article, We are going to perform How to Download and Install Oracle JAVA 11 on CentOS 8 Manually or any other cloud platform like Amazon EC2, Azure VM, Google Cloud Compute,etc. with preinstalled CentOS 8.

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.

Oracle Java 8 has ended support in January 2019, You should upgrade to latest version.

Prerequisites

• CentOS 8 with Minimal Installation
• SSH access with sudo privileges

To check CentOS version:

$ uname -a

OR

$ cat /etc/os-release

Output:

NAME="CentOS Linux"

VERSION="8 (Core)"

ID="centos"

ID_LIKE="rhel fedora"

VERSION_ID="8"

PLATFORM_ID="platform:el8"

PRETTY_NAME="CentOS Linux 8 (Core)"

ANSI_COLOR="0;31"

CPE_NAME="cpe:/o:centos:centos:8"

HOME_URL="https://www.centos.org/"

BUG_REPORT_URL="https://bugs.centos.org/"

 CENTOS_MANTISBT_PROJECT="CentOS-8"

CENTOS_MANTISBT_PROJECT_VERSION="8"

REDHAT_SUPPORT_PRODUCT="centos"

REDHAT_SUPPORT_PRODUCT_VERSION="8"

Follow the below steps to Install Oracle Java 11 on CentOS 8 Manually using command line.

Step 1: Download Oracle Java 11

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 11.0.6” section, click on “Accept License Agreement” Radio button and download “jdk-11.0.6_linux-x64_bin.tar.gz” setup for Linux.

After downloading into local machine, using SCP/SFTP/FTP transfer the file from local machine to CentOS 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-11.0.6_linux-x64_bin.tar.gz /opt/jdk/$ cd /opt/jdk/$ sudo sudo tar -zxf jdk-11.0.6_linux-x64_bin.tar.gz

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

# ls

Output:

$ ls 

jdk-11.0.6  jdk-11.0.6_linux-x64_bin.tar.gz

Step 3: Install Oracle Java 11 on CentOS 8 with Alternatives

Use update-alternatives command to configure java on your system

$ sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk-11.0.6/bin/java 100

After executing above command it shows below output:

Output:

update-alternatives: using /opt/jdk/jdk-11.0.6/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:

$ sudo update-alternatives --display java

Output:

java - status is auto.

 link currently points to /opt/jdk/jdk-11.0.6/bin/java

/opt/jdk/jdk-11.0.6/bin/java - priority 100

Current `best' version is /opt/jdk/jdk-11.0.6/bin/java.

To change for alternative mode:

$ sudo update-alternatives --config java

Here In my system, I am configuring Java 11 first time, if you had installed any previous version of java it shows options like 0,1,2 to set default version of Java.

Output

There is 1 program that provides 'java'.   

Selection    Command

-----------------------------------------------

*+ 1           /opt/jdk/jdk-11.0.6/bin/java 

Enter to keep the current selection[+], or type selection number: 1

Step 5: Setting the JAVA_HOME Environment Variables

To define the environment variable:

$ sudo  nano /etc/environment

Paste the below variable on the file:

JAVA_HOME=/opt/jdk/jdk-11.0.6

To check variables defined:

$ source /etc/environment

$ echo $JAVA_HOME

Output:

/opt/jdk/jdk-11.0.6

Update the System packages

$ sudo yum update

Step 6: Verify Java Version

To check the java version:

$ java -version

Output:

java version "11.0.6" 2020-01-14 LTS

Java(TM) SE Runtime Environment 18.9 (build 11.0.6+8-LTS)

Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.6+8-LTS, mixed mode)

If you seeing output like above then we have  successfully downloaded and installed oracle Java 11 on CentOS 8 Manually.

Conclusion

In this article, We have covered install oracle java 11 on CentOS 8,downloaded Oracle Java 8 from official site, installed using command line, configured JAVA_HOME ,checked to switch java version and checked installed java version using command line.

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