With the current implementation, it's not possible to define an EndpointInterceptor on a particular endpoint. You can only add interceptors on EndpointMapping so in a group of endpoint.
When you use annotations (@Endpoint), you have only one EndpointMapping (AnnotationMethodEndpointMapping) for all endpoints and you can not define an interceptor for one method.
Personally, I would like secured some methods but not all with the XwsSecurityInterceptor. But with the AnnotationMethodEndpointMapping, I can't do that.
A thread in the forum about this problem.