报错：Cannot invoke “springfox.documentation.service.ParameterType.getIn()“

前言

  遇到报错：Cannot invoke "springfox.documentation.service.ParameterType.getIn()" because the return value of "springfox.documentation.service.RequestParameter.getIn()" is null怎么解决？

一、报错分析

经过跋山涉水最后定位到报错代码片段：

@PostMapping("/queryOneTimeRewardPunishDeatail")
    @ApiOperation(value = "查询一次性奖惩详情")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "rewardPunishmentId", value = "一次性奖惩编号", required = true),
            @ApiImplicitParam(name = "pageNum", value = "当前页码", required = true),
            @ApiImplicitParam(name = "pageSize", value = "每页数量", required = true)
    })
    public ResponseUtil<OneTimeRewardPunishDto> queryOneTimeRewardPunishDeatail(@RequestBody OneTimeRewardPunishParam oneTimeRewardPunishParam) {
        省略.....
    }

其实报错的原因很简单，那就是使用swagger的@ApiImplicitParams注解描述了不存在的参数，导致报"springfox.documentation.service.RequestParameter.getIn()" is null
的错，只需要修改正确的参数描述就好

二、解决办法

  一般可以去看看近期代码修改，哪些修改了controller层的代码，看看是不是参数改了，没修改swagger注解的参数描述，如果发现都正常那就看看别的修改地方哪些使用swagger注解不规范。

修改代码

@PostMapping("/queryOneTimeRewardPunishDeatail")
    @ApiOperation(value = "查询一次性奖惩详情")
    @ApiImplicitParam(name = "oneTimeRewardPunishParam", value = "一次性奖惩参数", dataTypeClass = OneTimeRewardPunishParam.class, required = true)
    public ResponseUtil<OneTimeRewardPunishDto> queryOneTimeRewardPunishDeatail(@RequestBody OneTimeRewardPunishParam oneTimeRewardPunishParam) {
        省略.....
    }

总结

• 本文简单讲述了报错：Cannot invoke "springfox.documentation.service.ParameterType.getIn()" because the return value of "springfox.documentation.service.RequestParameter.getIn()" is null的原因以及解决办法。
• 欢迎大家提出建议以及批评，有任何问题可以私信。