This is obsolete functionality. It is no longer supported or maintained.
IDM Model Web Service Interface was deprecated in midPoint 4.0. Therefore the sample client does not bring any substantial value. The client may even encourage the users to use deprecated SOAP functionality. Therefore all the SOAP clients were removed from midPoint 4.0.
This is a short description how to use
model-client-sample which demonstrates the use of Java client based on JAX-WS. This approach is beneficial because it provides good maintainability of the code on the compiler level. I.e. if the midPoint API changes in an incompatible manner (in future midPoint releases) than the client code will break and indicate the exact place that needs to be fixed. This is saving a lot of testing effort. If the midPoint API changes in a compatible manner then the client code should work without any major change.