code: public static String getSEIClassNameFromAnnotation(ClassInfo classInfo) {
          AnnotationInfo annotationInfo = getAnnotationInfoFromClass(classInfo, "SEI Name");
          if (annotationInfo == null) {
              return null;
          }
  
          boolean webServiceProviderAnnotation = isProvider(classInfo);
  
          return webServiceProviderAnnotation ? null : annotationInfo.getValue(JaxWsConstants.ENDPOINTINTERFACE_ATTRIBUTE).getStringValue();
      }
docs: Only get the Service Endpoint Interface class name from @WebService annotation
  
  @param classInfo
  @return