具体表现为出现 "Cannot deserialize instance ofjava.lang.Stringout of START_OBJECT token" 错误。经过仔细研究和调试,发现问题的根源在于之前使用的 fastjson 转换库被替换为 jackson 后无法正确读取数据。 针对这个问题,我们需要做一些调整和更改。首先,让我们来看一下相关的代码内容:
前端请求进入后端控制器报错【Cannot deserialize instance of `java.lang.String` out of START_OBJECT token】,从错误信息上看是json解析错误,对比下前端请求发送内容和后端控制器接收参数即可发现问题。 前端发送内容: api_save(JSON.stringify({ po:this.form })).then(response=>{if(response.code === 200)...
org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList` out of...
这段代码将正确地将JSON对象反序列化为FileInfo对象,而不会抛出“cannot deserialize instance of java.io.File out of start_object token”错误。
JsonMappingException: Can not deserial ize instance of java.lang.String out of START_OBJECT token ...
At this time, the returned is < long > XXX < / long >, and "cannot deserialize instance of" appears when other services are acceptedjava.lang.Long out of START_ If the object token is 2.10.1, it will return XXX. At this time, other services will accept it, and this problem will ...
TypeError: Object of type 'int32' is not JSON serializable 2019-12-06 14:41 − 将模型用flask封装,返回json时报错:TypeError: Object of type 'int32' is not JSON serializable 网上搜索出的解决方案:重写json.JSONEncoder class MyEncoder(json.JSONEncoder): d... 悦悦的小屋 0 2799 < 1 >...
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of java.util.ArrayList out of START_OBJECT token at [Source: (String)"{“productName”:“蜜汁鸡翅”,“productPrice”:0.02,“productStock”:957,“productDescription”:“好吃”,“productIcon”:"//fuss10.elemecdn...
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.lang.Long` out of START_OBJECT token at [Source: de.undercouch.bson4jackson.io.LittleEndianInputStream@52ff6b69; pos: 55] (through reference chain: org.graylog2.system.traffic.AutoValue_Tr...
1.POST请求中content的值必须为json格式(存储形式可以是字符串,也可以是byte数组); 2.@RequestBody注解的参数类型必须是完全可以接收参数值的类型,比如:Map,JSONObject,或者对应的JavaBean; 所以Integer类型不能作为@RequestBody注解的参数类型,将上述代码修改如下(前端改成get请求)即可: ...