Install java from source

install_java_from_source.txt

Download java from this link: 
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
Alternatively , wget as below:
wget --no-check-certificate --no-cookies - --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/7u51-b13/jdk-7u51-linux-x64.tar.gz


sudo mv jdk-7u51-linux-x64.tar.gz /usr/lib/jvm [create if /usr/lib/jvm not present, can be put in /usr/local also.]
sudo tar zxvf jdk-7u51-linux-x64.tar.gz

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_51/bin/javac 1
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_51/bin/java 1
sudo update-alternatives --set javac /usr/lib/jvm/jdk1.7.0_51/bin/javac
sudo update-alternatives --set java /usr/lib/jvm/jdk1.7.0_51/bin/java

sudo vim /etc/profile
JAVA_HOME=/usr/lib/jvm/jdk1.7.0_51
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME
export PATH

source /etc/profile

Done.