Java in centos

Posted: December 5, 2014 in Open source

Step 1: Download JAVA Archive
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/8u25-b17/jdk-8u25-linux-x64.tar.gz”
# tar xzf jdk-8u25-linux-x64.tar.gz
Step 2: Install JAVA using Alternatives
# cd /opt/jdk1.8.0_25/
# alternatives –install /usr/bin/java java /opt/jdk1.8.0_25/bin/java 2
# alternatives –config java
There is 1 program that provides ‘java’.
Selection Command
———————————————–
*+ 1 /opt/jdk1.8.0_25/bin/java
Enter to keep the current selection[+], or type selection number: 1
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_25/bin/jar 2
# alternatives –install /usr/bin/javac javac /opt/jdk1.8.0_25/bin/javac 2
# alternatives –set jar /opt/jdk1.8.0_25/bin/jar
# alternatives –set javac /opt/jdk1.8.0_25/bin/javac
Step 3: Check Version of JAVA
Check the installed version of java using following command.
[server@localhost ~]$ java -version
java version “1.8.0_25”
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-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_25
Setup JRE_HOME Variable
# export JRE_HOME=/opt/jdk1.8.0_25/jre
Setup PATH Variable
# export PATH=$PATH:/opt/jdk1.8.0_25/bin:/opt/jdk1.8.0_25/jre/bin

 

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