code: @RequestMapping(method = RequestMethod.GET, value = "/humanTask/search",
              produces = {MediaType.APPLICATION_JSON_VALUE, MediaType.TEXT_XML_VALUE})
      public ResponseEntity<List<HumanTaskModel>> findActiveHumanTasks( @RequestParam(required = false) String role,
                                                                        @RequestParam(required = false) String user ){
          if( StringUtils.isBlank( role ) && StringUtils.isBlank( user ) ){
              return new ResponseEntity<>( HttpStatus.BAD_REQUEST );
          }
          List<WorkItemState> woits = facade.findActiveHumanTasksByRoleAndUser( role, user );
          return new ResponseEntity<>( createHumanTasksModel( woits ), HttpStatus.OK );
      }
docs: Searches active human tasks by role and/or user.
  
  <pre>
  Request:  GET /humanTask/search?role=auditor&user=hans
  Response: OK, [{refNum:3, woinRefNum:1, tokenId:2, status:EXECUTED, role:"auditor", user:"hans", arguments:{task:"audit customer 500"}}]
  </pre>