code: private void processExistingWSDL(String wsdlLocation, Member newMember) throws InjectionException {
          // if the wsdlLocation for this service reference is specified in the DD, log a debug statement and continue
          if (wsrInfo.getWsdlLocation() != null && !"".equals(wsrInfo.getWsdlLocation())) {
              if (tc.isDebugEnabled()) {
                  Tr.debug(tc, "For the " + wsrInfo.getJndiName() + " service reference, " + "the " + wsrInfo.getWsdlLocation()
                               + " WSDL file is specified in the " + "deployment descriptor. Annotation metadata referencing a WSDL file for "
                               + "this service reference will be ignored.");
              }
          } else { // else we want to set the value to whatever is in the annotation
              if (tc.isDebugEnabled()) {
                  Tr.debug(tc, "For the " + wsrInfo.getJndiName() + " service reference, " + "setting the wsdlLocation: " + wsdlLocation);
              }
              wsrInfo.setWsdlLocation(wsdlLocation);
          }
      }
docs: This will compare the wsdlLocation attribute of the various annotations that have refer to the same service
  reference. If they differ we will throw an exception as the runtime will not be able to determine which WSDL to
  use. We will only do this checking if there was not a WSDL location specified in the deployment descriptor. If
  the DD specifies a deployment descriptor that value will be used, and other values will be ignored.