1. Goto download the latest jdk from sun’s website

   http://java.sun.com/javase/downloads/index.jsp

2. Accept the agreement and download the JDK RPM-in-bin for linux and make the downloaded binary executable and run it:
   $ chmod u+x jdk–linux-i586-rpm.bin
   $ ./jdk–linux-i586-rpm.bin
3. The rpm is extracted from the bin and installed. The java version is now installed in /usr/java/.
4. Get the matching JPackage compatibility package for this Sun JDK:
   $ links ftp://jpackage.hmdc.harvard.edu/JPackage/1.7/generic/RPMS.non-free/
   $ rpm -ivh java-x.x.x-sun-compat-x.x.x.xx-1jpp.i586.rpm

For RHEL 5.2 or higher you can just install the latest packages from the repository:

$ yum install java-1.6.0-sun-devel

Make the Sun VM default for the system

To make the Sun JDK the default for the entire system, use the ‘alternatives’ method. This will create symlinks in /etc/alternatives/ that are used throughout the entire system (eg see “$ ll /usr/bin/java”).
[select the Sun version instead of the GNU version for each of these commands]

$ /usr/sbin/alternatives --config java
$ /usr/sbin/alternatives --config javac

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