The JDK is a development environment for building applications, applets, and components using the Java programming language from Oracle Technology Network.
In order  to install JDK on your Linux Plain or cPanel sever you may follow these instructions.

Download the intended version of JDK from oracle if your server fullfils all the prerequisites of the selected version of JDK from the below link

http://www.oracle.com/technetwork/java/javase/downloads/index.html

Create a directory /usr/java and download JDK tar in it.

Like in our case  we have downloaded jdk-7u11-linux-x64.gz and uploaded it to /usr/java directory

Extract the contents in jdk-7u11-linux-x64.gz

root@centos [/usr/java]# tar -xzvf jdk-7u11-linux-x64.gz

You will get a directory such as “jdk1.7.0_11”

Now lets set JAVA_HOME path. To do this add lines like below to the .bash_profile.

root@centos [/usr/java]# vi ~/.bash_profile

export JAVA_HOME=/usr/java/jdk1.7.0_11
export PATH=$JAVA_HOME/bin:$PATH
export PATH=$PATH:$JAVA_HOME/bin

The path /usr/java/jdk1.7.0_11 may get changed depending upon the version of JDK you choose to download and the directory where you extract the installation.

Once the .bash_profile is configured, now to set the environment variables which you have just configured use the below command

root@centos [/usr/java]# source ~/.bash_profile

To Verify new settings use following commands:

root@centos [/usr/java]# echo $JAVA_HOME
/usr/java/jdk1.7.0_11

root@centos [/usr/java]# echo $PATH
/usr/java/jdk1.7.0_11/bin:/usr/java/jdk1.7.0_11/bin:/usr/local/jdk/bin:/usr/kerberos/sbin:
/usr/kerberos/bin:/usr/lib/courier-imap/sbin:/usr/lib/courier-imap/bin:/usr/local/sbin:
/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:=/usr/java/jdk1.7.0_11/bin:/usr/local/bin:
/usr/X11R6/bin:/root/bin:/usr/java/jdk1.7.0_11/bin:/usr/java/jdk1.7.0_11/bin

 

To Set JAVA_HOME / PATH for all the users edit /etc/profile this will setup global config

root@centos [/usr/java]# vi /etc/profile

export JAVA_HOME=/usr/java/jdk1.7.0_11
export PATH=$JAVA_HOME/bin:$PATH
export PATH=$PATH:$JAVA_HOME/bin

Save and close the file. Once again you need to type the following command to activate the path settings immediately:

root@centos [/usr/java]# source /etc/profile

Now check the java version as follows

root@centos [/usr/java]# java -version
java version “1.7.0_11”
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)