July 11, 2017

  

How to Install JAVA 8 (JDK/JRE 8u131) on CentOS/RHEL 7/6 and Fedora

After a long wait, finally Java SE Development Kit 8 is available to download. JDK 8 has been released on Mar,18 2014 for general availability with the many featured enhancements. You can find all the enhancements in JDK 8 here.
This article will help you to Install JAVA 8 (JDK/JRE 8u131) or update on your system. Read the instruction carefully before downloading Java from Linux command line. To Install Java 8 in Ubuntu and LinuxMint read This Article.


Downloading Latest Java Archive

Download latest Java SE Development Kit 8 release from its official download page or use following commands to download from shell.

For 64Bit

# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz"

# tar xzf jdk-8u131-linux-x64.tar.gz

For 32Bit

# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-i586.tar.gz"

# tar xzf jdk-8u131-linux-i586.tar.gz 

Install Java with Alternatives

After extracting archive file use alternatives command to install it. alternatives command is available in chkconfig package.
# cd /opt/jdk1.8.0_131/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_131/bin/java 2
# alternatives --config java


There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /opt/jdk1.7.0_71/bin/java
 + 2           /opt/jdk1.8.0_45/bin/java
   3           /opt/jdk1.8.0_91/bin/java
   4           /opt/jdk1.8.0_131/bin/java

Enter to keep the current selection[+], or type selection number: 4
At this point JAVA 8 has been successfully installed on your system. We also recommend to setup javac and jar commands path using alternatives
# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_131/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_131/bin/javac 2
# alternatives --set jar /opt/jdk1.8.0_131/bin/jar
# alternatives --set javac /opt/jdk1.8.0_131/bin/javac 

Check Installed Java Version

Check the installed Java version on your system using following command.
root@tecadmin ~# java -version

java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode) 

Configuring Environment Variables

    Most of Java based application’s uses environment variables to work. Set the Java environment variables using following commands

  • Setup JAVA_HOME Variable
    • # export JAVA_HOME=/opt/jdk1.8.0_131
  • Setup JRE_HOME Variable
    • # export JRE_HOME=/opt/jdk1.8.0_131/jre
  • Setup PATH Variable
    • # export PATH=$PATH:/opt/jdk1.8.0_131/bin:/opt/jdk1.8.0_131/jre/bin
Also put all above environment variables in /etc/environment file for auto loading on system boot.

Article Source & Credit:
Original article posted at the following URL: 
https://tecadmin.net/install-java-8-on-centos-rhel-and-fedora/
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