JAX-WS specifies a detailed mapping from a service defined in WSDL to the Java
classes that will implement that service. The logical interface, defined by the
wsdl:portType element, is mapped to a service endpoint interface (SEI). Any
complex types defined in the WSDL are mapped into Java classes following the mapping
defined by the Java Architecture for XML Binding (JAXB) specification. The endpoint
defined by the wsdl:service element is also generated into a Java class that
is used by consumers to access endpoints implementing the service.
The wsdl2java command automates the generation of this code. It also provides options for generating starting point code for your implementation and an ant based makefile to build the application. wsdl2java provides a number of arguments for controlling the generated code.