Install Oracle Java 8 on CentOS 7

installJava.txt

java -version


# visit http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

# determine latest jdk version 

# accept license and select i586/x64 rpm version and click download .ex jdk-8uXXX-linux-x64.rpm where XXX is revision


rpm -ivh jdk-8u131-linux-x64.rpm

which java 

cd /usr/java 


# to verify java 
ll -lsah

# set which java to use when more than one JDK/JRE is installed

alternatives --config java

alternatives --config javac

alternatives --config javaws

alternatives --config jar

# check alternatives 

ls -lA /etc/alternatives/

# Set environment variables to set java home and jre home and path 
# create a file called setJavaEnv.sh under /etc/profile.d/ directory.

vi /etc/profile.d/setJavaEnv.sh
#press insert and type following lines into script file

#!/bin/sh
# Sets Java home and add java to path

export JAVA_HOME=/usr/java/latest

export JDK_HOME=/usr/java/latest

export JRE_HOME=/usr/java/latest/jre

export PATH=/usr/java/latest/jre:/usr/java/latest:$PATH

#press escape and type :wqa to save all and exit

# make script exectable
chmod +x /etc/profile.d/setJavaEnv.sh

# apply changes without restart
source /etc/profile.d/setJavaEnv.sh

# to test env variables and path is set

echo $JAVA_HOME

echo $JRE_HOME

java -version

Correct version