The CAS server doesn't allow any client to connect to it. Each client has to be registered with the desired CAS server. There are multiple mechanisms by which we can register a client to the server. We will use the JSON/YML configuration to register our client to the server. Go ahead and add the following dependency to your pom.xml file within the server project that you just cloned:

<dependency>
   <groupId>org.apereo.cas</groupId>
   <artifactId>cas-server-support-json-service-registry</artifactId>
   <version>${cas.version}</version>
</dependency>
<dependency>
   <groupId>org.apereo.cas</groupId>
   <artifactId>cas-server-support-yaml-service-registry</artifactId>
   <version>${cas.version}</version>
</dependency>

Most of the versions in the pom.xml file are managed by the parent POM.