My question is if TimeServerImpl implements multiple interfaces, but @WebService cannot take more than one endpointInterface, what should I do?
Then don't use the endpointInterface attribute in the @WebService annotation, because by default all the public methods will be exposed as WebService operations.
From the Web Services Metadata-2.0 (JSR-181)
If the implementation bean does not implement a service endpoint interface and there are no @WebMethod annotations in the implementation bean (excluding @WebMethod annotations used to exclude inherited @WebMethods), all public methods other than those inherited from java.lang.Object will be exposed as Web Service operations.
1. Implicit SEI : When you do provide value to endpointInterface attribute in @WebService annotation, JAX-WS runtime creates a interface which has all the methods of SIB.
2. Explicit SEI : You have to provide value to endpointInterface. The value must be fully qualified name of SEI interface.
In the situation you described, implement as many interfaces you want and use Implicit SEI technique. Then, JAX-WS creates a interface dynamically whose methods are exposed web service operations.
Hope this helps .