Java JDK 1.8 Installation/Migration Process in Linux/Unix System

Installation / Migration JAVA JDK 1.8 In Unix / Linux System..

Step 1: Java Installation process
             Download Java JDK 1.8 Version (http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html)
             Copy JDK Software (jdk1.8.0_77.zip) to this path ..[root@RAMA jdk1.8.0_77]#cd  /usr/java/
             Go to this path ..[root@RAMA jdk1.8.0_77]#cd /usr/java
             And unzip Java software  [root@RAMA jdk1.8.0_77]#unzip jdk1.8.0_77.zip
             Open following file and set the java home directory for all users
             [root@RAMA jdk1.8.0_77]#cat /etc/profile
             [root@RAMA jdk1.8.0_77]#export JAVA_HOME=/usr/java/jdk1.8.0_77
             [root@RAMA jdk1.8.0_77]#export PATH=$JAVA_HOME/bin:$PATH
             [root@RAMA jdk1.8.0_77]#source /etc/profile
             [root@RAMA jdk1.8.0_77]#java -version
             If Java version showing older version then we need to update java version

Step 2: Java version updation from JDK 1.7 to JDK 1.8
             update java, javac, jar alternatives as:
             [root@RAMA jdk1.8.0_77]#cd /usr/java/jdk1.8.0_77
             check available java alternatives
             [root@RAMA jdk1.8.0_77]# update-alternatives --config java
             Install java jdk 1.8 alternative
             [root@RAMA jdk1.8.0_77]# update-alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_80/bin/java 100
             Similarly Update alternatives for both Javac and Jar
             [root@RAMA jdk1.8.0_77]# update-alternatives --install /usr/bin/javac javac /usr/java/jdk1.7.0_80/bin/javac 100
             [root@RAMA jdk1.8.0_77]# update-alternatives --config javac
             [root@RAMA jdk1.8.0_77]# update-alternatives --install /usr/bin/jar jar /usr/java/jdk1.7.0_80/bin/jar 100
            [root@RAMA jdk1.8.0_77]# update-alternatives --config jar

Step 3: Setting up Java Environment Variables
            [root@RAMA jdk1.8.0_77]#export JAVA_HOME=/usr/java/jdk1.8.0_77
            [root@RAMA jdk1.8.0_77]#export JRE_HOME=/usr/java/jdk1.8.0_77/jre
            [root@RAMA jdk1.8.0_77]#export PATH=$JAVA_HOME/bin:$PATH
            update above entries into this file (/etc/profile) for permanent to all users

Step 4: Give permissions and check java version
            [root@RAMA jdk1.8.0_77]# chmod -R 755 /usr/bin/java
            [root@RAMA jdk1.8.0_77]# chmod -R 755 /usr/bin/javac
            [root@RAMA jdk1.8.0_77]# chmod -R 755 /usr/bin/jar
            [root@RAMA jdk1.8.0_77]# java -version 

all the Best..