For the sake of convenience, Java versions of each API are included under <install path>\CAS\version\lib :

Each API also includes utility (helper) classes in its JAR file.

If desired, you can use the Java version of the API rather than generate client stubs from the WSDL files. The Java versions were generated using Apache CXF. For other languages (such as .NET), you must generate the client stubs in your programming language.