install jdk in ubuntu 12.04

 

1. Installing Sun JDK 6 on Ubuntu

Download the sun jdk 6 bin from here .

 

sudo mkdir /usr/lib/jvm

sudo cp Downloads/jdk-6u32-linux-x64.bin /usr/lib/jvm/

 

cd /usr/lib/jvm/

 

chmod +x jdk-6u32-linux-x64.bin

 

sudo ./jdk-6u32-linux-x64.bin

 

sudo rm jdk-6u32-linux-x64.bin

 

Install new java source in system

 

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.0_32/bin/javac 1

 

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.6.0_32/bin/java 1

 

sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.6.0_32/bin/javaws 1

 

choose default java

 

sudo update-alternatives --config javac

sudo update-alternatives --config java

sudo update-alternatives --config javaws

 

java version test:

java -version

 

Verify the symlinks all point to the new java location:

ls -la /etc/alternatives/java*