PREREQUISITES
update yum
$ sudo yum update
first make sure you have wget
$ sudo yum install wget
INSTALL JAVA 8
go to opt directory
$ cd /opt/
download latest version of java
see official page for latest version: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
$ sudo 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/8u101-b13/jdk-8u101-linux-x64.tar.gz”
extract it, it will create the directory jdk1.8.0_101
$ sudo tar zxf jdk-8u101-linux-x64.tar.gz
let’s see if any alternative old java used
$ cd /etc/alternatives
$ ls -l java
java -> /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64/jre/bin/java
if your java points to an old version i.e 1.7.x then follow this steps
$ sudo alternatives –install /usr/bin/java java /opt/jdk1.8.0_101/bin/java 2
$ sudo alternatives –config java
You will see a list of jdks, select the latest java number (I selected number 2 which is the /opt/jdk1.8.0_101/bin/java
Now JAVA 8 has been successfully installed on the system. It’s also recommend to setup javac and jar commands path using alternatives
$ sudo alternatives –install /usr/bin/jar jar /opt/jdk1.8.0_101/bin/jar 2
$ sudo alternatives –install /usr/bin/javac javac /opt/jdk1.8.0_101/bin/javac 2
$ sudo alternatives –set jar /opt/jdk1.8.0_101/bin/jar
$ sudo alternatives –set javac /opt/jdk1.8.0_101/bin/javac
check java verion
$ java -version
java version “1.8.0_101”
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode
configure java environmental variables
SETUP ENVIRONMENTAL VARIABLES
setup JAVA_HOME variable
$ export JAVA_HOME=/opt/jdk1.8.0_101/
setup JRE_HOME
$ export JRE_HOME=/opt/jdk1.8.0_101/jre/
setup PATH variable
$ export PATH=$PATH:/opt/jdk1.8.0_101/bin:/opt/jdk1.8.0_101/jre/bin
However, to make it persistent use the below method instead of above
become root
$ sudo su
go to bashrc
$ vi /etc/bashrc
export JAVA_HOME=/opt/jdk1.8.0_101/
export JRE_HOME=/opt/jdk1.8.0_101/jre/
export PATH=$PATH:/opt/jdk1.8.0_101/bin:/opt/jdk1.8.0_101/jre/bin
source it
$ source /etc/bashrc
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