JSON parse error: Cannot deserialize value of type `java.util.ArrayList＜XXX＞……的解决方案

0. 报错信息

“JSON parse error: Cannot deserialize value of type java.util.ArrayList from String value (token jsonToken.VALUE_STRING); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type java.util.ArrayList from String value (token JsonToken.VALUE_STRING)\n at [Source: (org.springframework.util.StreamUtils$NonClosingInputStream); line: 6, column: 13] (through reference chain: com.ruoyi.wx.vo.WxHdVo[“yhzp”])”

1. 报错原因分析

WxHdVo.java

public class WxHdVo implements Serializable {        private String sbr;        private String yhdd;        private String yhbw;        private String yhms;        private List<ScHdImg> yhzp;}

WxHdController.java

@Controller@RequestMapping("/wx/hd")public class WxHdController {    @Autowired    private IScHdService scHdService;    @Autowired    private IScHdImgService scHdImgService;    @PostMapping("/add")    @ResponseBody    public String addHdFromWx(@RequestBody WxHdVo wxHdVo) {        ScHd scHd = new ScHd(wxHdVo.getSbr(), wxHdVo.getYhdd(), wxHdVo.getYhbw(), wxHdVo.getYhms());        scHdService.insertScHd(scHd);        Long scHdId = scHd.getId();        for (ScHdImg hdImg : wxHdVo.getYhzp()) {            scHdImgService.insertScHdImg(new ScHdImg(scHdId, hdImg.getUrl(), new Date(), "1"));        }        return "success";    }}

发送请求的Body

{    "sbr": "xinglibao",    "yhdd": "绿地世纪城",    "yhbw": "一号消防通道",    "yhms": "消防通道被堵塞",    "yhzp": "[{'url': 'haha'}, {'url': 'heihei'}]"}

在百度搜索后发现是自己的 json 写错了，应将"yhzp": "[{'url': 'haha'}, {'url': 'heihei'}]"修改为"yhzp": [{"url": "haha"}, {"url": "heihei"}]
在百度搜索后发现是自己的 json 写错了，应将"yhzp": "[{'url': 'haha'}, {'url': 'heihei'}]"修改为"yhzp": [{"url": "haha"}, {"url": "heihei"}]
在百度搜索后发现是自己的 json 写错了，应将"yhzp": "[{'url': 'haha'}, {'url': 'heihei'}]"修改为"yhzp": [{"url": "haha"}, {"url": "heihei"}]

2. 发送请求

来源地址：https://blog.csdn.net/weixin_45953673/article/details/128855078