...
In your CAS_HOME, you can type "mvn package install". This will create all of the jar and war files for the CAS modules. Alternatively, you can enter any of the CAS_HOME/{module} sub directories and execute "mvn package install" to generate just that particular JAR or WAR.
As compilation require requires a network connection, if you are behind a http proxy, you have to indicate some extra option to mvn command: "mvn -Dhttp.proxyHost=xxx -Dhttp.proxyPort=xxx package install"
...