The usual way to construct a web service client is to include the Java interface for the service (the SEI) and any classes that are used for inputs and output in the client application. This is not always desirable or practical.
CXF supports several alternatives to allow an application to communicate with a service without the SEI and data classes. JAX-WS specified the Dispatch API, as well as the Provider interface for reading and writing XML. This page, however, describes the dynamic client facility of CXF. With dynamic clients, CXF generates SEI and bean classes at runtime, and allows you to invoke operations via APIs that take Objects, or by using reflection to call into full proxies.
Note that, in general, CXF only supports WSI-BP services. If you attempt to create a dynamic client for a WSDL that uses features outside of WSI-BP, CXF may throw an exception.