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Installing Oracle Java 6 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
    1.     chmod +x jdk-6u32-linux-x64.bin  
  3. To extract the bin file use the following command
    1.     ./jdk-6u32-linux-x64.bin  
  4. Using the following command create a folder called "jvm" inside /usr/lib if it is not already existing
    1.     sudo mkdir /usr/lib/jvm  
  5. Move the extracted folder into the newly created jvm folder
    1.     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
    1.     ls -la /etc/alternatives/java*  
  9. To verify Java has installed correctly use this command
    1. java -version  

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