userPermission returned by getUserPermission() for the selected namespace does not have namespace set

/**
   * A utility used to get permissions for selected namespace.
   * <p>
   * It's also called by the shell, in case you want to find references.
   *
   * @param protocol the AccessControlService protocol proxy
   * @param namespace name of the namespace
   * @throws ServiceException
   */
  public static List<UserPermission> getUserPermissions(
      AccessControlService.BlockingInterface protocol,
      byte[] namespace) throws ServiceException {
    AccessControlProtos.GetUserPermissionsRequest.Builder builder =
      AccessControlProtos.GetUserPermissionsRequest.newBuilder();
    if (namespace != null) {
      builder.setNamespaceName(ByteStringer.wrap(namespace)); 
    }
    builder.setType(AccessControlProtos.Permission.Type.Namespace);  //builder is set with type = Namespace
    AccessControlProtos.GetUserPermissionsRequest request = builder.build();  //I printed the request, its type is Namespace, which is correct.
    AccessControlProtos.GetUserPermissionsResponse response =  
       protocol.getUserPermissions(null, request);
/* I printed the response, it contains Global permissions, as below, not a Namespace permission.

user_permission {
  user: "a1"
  permission {
    type: Global
    global_permission {
      action: READ
      action: WRITE
      action: ADMIN
      action: EXEC
      action: CREATE
    }
  }
}

AccessControlProtos.GetUserPermissionsRequest has a member called type_ to store the type, but AccessControlProtos.GetUserPermissionsResponse does not.
*/
     
    List<UserPermission> perms = new ArrayList<UserPermission>(response.getUserPermissionCount());
    for (AccessControlProtos.UserPermission perm: response.getUserPermissionList()) {
      perms.add(ProtobufUtil.toUserPermission(perm));  // (1)
    }
    return perms;
  }