8. Install the Java Development Kit

The correct JDK must be installed on all the nodes in your cluster. To manually deploy the JDK:

  1. Check the version. From a terminal window, type:

    java -version
  2. (Optional) Uninstall the Java package if the JDK version is less than v1.6 update 31.

    rpm -qa | grep java
    yum remove {java-1.x.0-jdk-1.x.0.0-}
  3. (Optional) Verify that the default Java package is uninstalled.

    which java
  4. Download the Oracle 64-bit JDK jdk-6u31-linux-x64.bin from the Oracle download site.

  5. Change directory to the location where you downloaded the JDK and run the install.

    mkdir /usr/jdk1.6.0_31
    cd /usr/jdk1.6.0_31
    chmod u+x $JDK_download_directory/jdk-6u31-linux-x64.bin
  6. Create symbolic links (symlinks) to the JDK.

    mkdir /usr/java
    ln -s /usr/jdk1.6.0_31/jdk1.6.0_31 /usr/java/default
    ln -s /usr/java/default/bin/java /usr/bin/java
  7. Set up your environment to define JAVA_HOME to put the Java Virtual Machine and the Java compiler on your path.

    export JAVA_HOME=/usr/java/default
    export PATH=$JAVA_HOME/bin:$PATH

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