How to upgrade Java 1.4 to Java 1.6 on Red Hat Enterprise Linux system?

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Issue

We would like to upgrade the JDK to 1.6 without hampering the running environment and fulfilling all the required dependency.
We are unable to upgrade Java1.4 to Java 1.6 on RHEL 5.

Environment

Red Hat Enterprise Linux (RHEL)
- 5.x
- 6.x
- 7.x

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