...
NOTE: This walkthrough involves the use of precompiled Sun Java 6 and Apache Tomcat 5.5.x binaries rather than keeping RHEL 5 in sync with yum repositories.
Step 1: Remove pre-installed version of Apache Tomcat 5.5.x
Step 2: Download and install Sun JRE / JDK
Step 3: Set up necessary environment variables
Step 4: Download and install Apache Tomcat 5.5.x
Step 5: Download and install Ant 1.7.x
Step 6: Download and deploy CAS server 3.0.x