Installation Requirements

Depending on choice of configuration components, there may be additional requirements such as LDAP directory, database, and caching infrastructure. In most cases, however, requirements should be self evident to deployers who choose components with clear hardware and software dependencies. In any case where additional requirements are not obvious, the discussion of component configuration should mention system, software, hardware, and other requirements.


CAS at its heart is a Java-based web application. Prior to deployment, you will need to have JDK 21 installed.

:red_circle: Oracle JDK License

Oracle has updated the license terms on which Oracle JDK is offered. The new Oracle Technology Network License Agreement for Oracle Java SE is substantially different from the licenses under which previous versions of the JDK were offered. Please review the new terms carefully before downloading and using this product.

The key part of the license is as follows:

You may not: use the Programs for any data processing or any commercial, production, or internal business purposes other than developing, testing, prototyping, and demonstrating your Application.

Do NOT download or use the Oracle JDK unless you intend to pay for it. Use an OpenJDK-based build instead.

Servlet Containers

There is no officially supported servlet container for CAS, but Apache Tomcat is the most commonly used. Support for a particular servlet container depends on the expertise of community members.

See this guide for more info.

Build Tools

WAR overlays are provided to allow for a straightforward and flexible deployment solution. While it admittedly requires a high up-front cost in learning, it reaps numerous benefits in the long run.

:information_source: Do Less

You DO NOT need to have Gradle installed prior to the installation. It is provided to you automatically.

Git (Optional)

While not strictly a requirement, it’s HIGHLY recommended that you have Git installed for your CAS deployment, and manage all CAS artifacts, configuration files, build scripts and setting inside a source control repository.


No particular preference on the operating system, though Linux-based installs are typically more common than Windows.

Internet Connectivity

Internet connectivity is generally required for the build phase of any Maven/Gradle based project, including the recommended WAR overlays used to install CAS. The build process resolves dependencies by searching online repositories containing artifacts (jar files in most cases) that are downloaded and installed locally.


Anecdotal community evidence seems to suggest that CAS deployments would perform well on a dual-core 3.00Ghz processor with 8GB of memory, at a minimum. Enough disk space (preferably SSD) is also needed to house CAS-generated logs, if logs are kept on the server itself.

Remember that the above requirements are suggestions. You may get by perfectly fine with more or less, depending on your deployment and request volume. Start with the bare minimum and be prepared to adjust and strengthen capacity on demand if needed.