Installing Oracle java6 on Ubuntu

If you have already installed Ubuntu 12.04 you probably have realized that Sun java(oracle java) does not come prepacked with Ubuntu like it used to be , instead OpenJDK comes with it. Here is how you can install Oracle java on Ubuntu 12.04 manually.

1. Download jdk-6u32-linux-x64.bin from this link. If you have used 32-bit Ubuntu installation, download jdk-6u32-linux-x32.bin instead.
2. To make the downloaded bin file executable use the following command

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

3. To extract the bin file use the following command

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

4. Using the following command create a folder called "jvm" inside /usr/lib if it is not already existing

   sudo mkdir /usr/lib/jvm
   

5. Move the extracted folder into the newly created jvm folder

   sudo mv jdk1.6.0_32 /usr/lib/jvm/
   

6. To install the Java source use following commands

   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
   

7. To make this default java

   sudo update-alternatives --config javac
   sudo update-alternatives --config java
   sudo update-alternatives --config javaws
   

8. To make symlinks point to the new Java location use the following command

   ls -la /etc/alternatives/java*
   

9. To verify Java has installed correctly use this command

   java -version
   

10. To set JAVA_HOME variable and add to your PATH open up /etc/bash.bashrc file using following command

    sudo gedit /etc/bash.bashrc 
    

11. Now add the following lines to it.

    JAVA_HOME=/usr/lib/jvm/jdk1.6.0_32
    export JAVA_HOME
    PATH=$PATH:$JAVA_HOME/bin
    export PATH 
    

12. After doing that open up a new terminal and run following commands to verify JAVA_HOME has set correctly.

    $echo $JAVA_HOME
    Should output this ---> /usr/lib/jvm/jdk1.6.0_32
    $echo $PATH
    Should output this ---> [Other paths]:/usr/lib/jvm/jdk1.6.0_32/bin