How to Download and Install Oracle JAVA 8 on CentOS 7

In this article, We are going to perform How to Download and Install Oracle JAVA 8 on CentOS 7 Manually or any cloud VM instance like Amazon EC2, Azure VM, Google Compute Engine with preinstalled CentOS 7.

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

  • CentOS 7 with Minimal Installation
  • SSH access with sudo privileges

To check CentOS version:

$ uname -a

OR

$ cat /etc/os-release

Output:

$ cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

Follow the below steps to Install Oracle Java 8 on CentOS 7 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 8u231” section, click on “Accept License Agreement” Radio button and download “jdk-8u231-linux-x64.tar.gz” setup for CentOS 7

download oracle java 8 for ubuntu and centos 7

After downloading into local machine,using SCP/SFTP/FTP transfer the file from local machine to CentOS 7 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/sivasai/jdk-8u231-linux-x64.tar.gz /opt/jdk/
$ cd /opt/jdk/
$ sudo tar -zxf jdk-8u231-linux-x64.tar.gz

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

# ls

Output:

$ ls

jdk1.8.0_231 jdk-8u231-linux-x64.tar.gz

Step 3: Install Oracle Java 8 on CentOS 7 with Alternatives

Use update-alternatives command to configure java on your system
$ sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_231/bin/java 100
After executing above command it shows below output:
Output:
update-alternatives: using /opt/jdk/jdk1.8.0_231/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 - auto mode
  link best version is /opt/jdk/jdk1.8.0_231/bin/java
  link currently points to /opt/jdk/jdk1.8.0_231/bin/java
  link java is /usr/bin/java
/opt/jdk/jdk1.8.0_231/bin/java - priority 100
/opt/jdk/jdk1.8.0_231/bin/javac - priority 100
To change for alternative mode:
$ sudo update-alternatives --config java
It prompts for selecting by 0,1,2..so choose accordingly:
Output
$ sudo update-alternatives --config java

There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64/jre/bin/java)
   2           java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.191-2.6.15.4.el7_5.x86_64/jre/bin/java)
   3           /opt/jdk/jdk1.8.0_231/bin/java

Enter to keep the current selection[+], or type selection number: 3

Step 5: Setting the JAVA_HOME and JRE_HOME Environment Variables

To define the enviroment variable:
$ sudo  nano /etc/environment
Paste the below varible on the file:
JAVA_HOME=/opt/jdk/jdk1.8.0_231
JRE_HOME=/opt/jdk/jdk1.8.0_231/jre
To check variables defined:
$ source /etc/environment
$ echo $JAVA_HOME
Output:
/opt/jdk/jdk1.8.0_231
$ sudo yum update

Step 6: Verify Java Version

To check the java version:
$ java -version
Output:
$ java -version

java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
If you seeing output like above then we have  successfully set up the Oracle Java 8 on CentOS 7.

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 Download and Install Oracle Java 8 on Ubuntu 18.04/16.04 Manually

How to Download and Install Oracle JAVA 11 on Ubuntu 18.04/16.04 LTS

Sivasai Sagar

I am working as DevOps Engineer and having 5 years of Experience. Likes to share knowledge.

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