出現問題=有很多，下面的是一種。有些人不小心造成的。
 錯誤所在,上下的這兩個方法,有沒有發現請求路徑都是一樣的,雖然你跟的引數不一樣,但是還是會報錯,** 
    	報出問題: 方法初始化失敗,也就是springboot找不到應該請求哪個路徑。
        解決辦法,  可以將其中的一個@GetMapping修改為  @RequestMapping即可解決異常.  親測    


@Autowired
    private SpecifacationService specifacationService;
@GetMapping("/params")
    public ResponseEntity<List<SpecParam>> queryParamByCategoryId(
            @RequestParam(value = "gid", required = false) Long gid,
            @RequestParam(value = "cid", required = false) Long cid,
            @RequestParam(value = "searching", required = false) Boolean searching,
            @RequestParam(value = "generic", required = false) Boolean generic) {

        List<SpecParam> list = this.specifacationService.querySpecParams(gid, cid, searching, generic);
        if (list == null || list.size() == 0) {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
        return ResponseEntity.ok(list);
    }

   

    //查詢組裡面的引數資訊
    **@GetMapping("/params")**
    public ResponseEntity<List<SpecParam>> queryParamBygid(@RequestParam(value = "gid", defaultValue = "1") Long gid) {
        List<SpecParam> listParam = specifacationService.queryParamBygid(gid);
        if (CollectionUtils.isEmpty(listParam)) {

            return ResponseEntity.notFound().build();
        }

        return ResponseEntity.ok(listParam);

    }



	

         
       2018-8-13   記.