Most people will find that installing CAS 3.0.x on RHEL 5 isn't initially as straightforward as they hoped. This is largely in part due to Redhat not officially supporting either the Sun Java Development Kit (JDK). By default, Redhat has bundled RHEL 5 with the GNU Compiler for Java (GCJ) from JPackage, which is equivalent to J2SE 1.4.2 as of July 2007. This can cause code compiled by newer versions of Sun JDK to be incompatible with GCJ. However, it is not only possible but fairly easy to get CAS 3.0.x deployed on RHEL 5.
As an alternative to the instructions below it is possible to use the Sun JVM/JDK (1.5.0) which is supplied on the RHEL5 Supplementary Disc, and the corresponding supplementary updates repository. This can be used with the stock RHEL5 version of tomcat (5.5.23). The advantage of using this combination is that you will be provided with security updates for these package by Redhat - otherwise you will have to manually keep track of any security updates and manually download reinstall as necessary. Once you have the RHEL5 supplementary repository configured, you can:
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yum install java-1.5.0-sun-devel
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NOTE: This walkthrough uses Apache HTTP server to front-end Apache Tomcat 5.5.x for SSL by forwarding requests through the Apache mod_jk module.
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