Friday, April 25, 2014

Install Java 8 (JDK 8u5) on CentOS/RHEL 6/5 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 8u5) or update on your system. Read instruction carefully for downloading java from Linux command line.
Step 1: Download JAVA Archive
Download latest Java SE Development Kit 8 release from its official download page.
# 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/8u5-b13/jdk-8u5-linux-i586.tar.gz"
Note: If Above wget command doesn’t not worked for you watch this screencast to download JDK from terminal.
Now extract downloaded archive file
# tar xzf jdk-8u5-linux-i586.tar.gz
Step 2: Install JAVA using Alternatives
After extracting archive file use alternatives command to install it. alternatives command is available in chkconfig package.
# cd /opt/jdk1.8.0_05/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_05/bin/java 2
# alternatives --config java
 
 
There are 3 programs which provide 'java'.
 
  Selection    Command
-----------------------------------------------
*  1           /opt/jdk1.8.0/bin/java
 + 2           /opt/jdk1.7.0_55/bin/java
   3           /opt/jdk1.8.0_05/bin/java
 
Enter to keep the current selection[+], or type selection number: 3
 
At this point JAVA 8 has been successfully installed on your system.
Step 3: Check Version of JAVA .
Check the installed version of java using following command.
# java -version 
 
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Client VM (build 25.5-b02, mixed mode)
 
Step 4: Setup 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_05
  • Setup JRE_HOME Variable
# export JRE_HOME=/opt/jdk1.8.0_05/jre
  • Setup PATH Variable
# export PATH=$PATH:/opt/jdk1.8.0_05/bin:/opt/jdk1.8.0_05/jre/bin

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