出现问题=有很多，下面的是一种。有些人不小心造成的。
 错误所在,上下的这两个方法,有没有发现请求路径都是一样的,虽然你跟的参数不一样,但是还是会报错,** 
    	报出问题: 方法初始化失败,也就是springboot找不到应该请求哪个路径。
        解决办法,  可以将其中的一个@GetMapping修改为  @RequestMapping即可解决异常.  亲测    


@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);
    }

   

    //查询组里面的参数信息
    **@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   记.