Cannot construct instance of `java.time.LocalDateTime`

柔光的暖阳◎ 2023-06-09 14:26 12阅读 0赞

异常信息：（很很明显是反序列化错误）

> Cannot construct instance of \`java.time.LocalDateTime\` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('2019-10-21 13:57:38')  
>  at \[Source: UNKNOWN; line: -1, column: -1\] (through reference chain: java.util.ArrayList\[0\]->com.construn.vehicle.tmrp.entity.IncomeSummaryRepInfo\["createTime"\])   
> java.lang.IllegalArgumentException: Cannot construct instance of \`java.time.LocalDateTime\` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('2019-10-21 13:57:38')  
>  at \[Source: UNKNOWN; line: -1, column: -1\] (through reference chain: java.util.ArrayList\[0\]->com.construn.vehicle.tmrp.entity.IncomeSummaryRepInfo\["createTime"\])

错误场景：数据库createTime字段为datetime类型；实体类中为LocalDateTime类型；返回给前端，修改的时候，前端再返回来，就报了这个错误。（说明：我这里，前端穿的是一个实体类list；在controller中用map接收的）

解决：我用的 ObjectMapper转的list

>     List<xxxx> list1 = (List<xxxx>) map.get("list");
>     ObjectMapper mapper = new ObjectMapper();
>     //序列化的时候序列对象的所有属性
>     mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
>     mapper.registerModule(new JavaTimeModule());
>     List<xxxx> list = mapper.convertValue(list1, new TypeReference<List<xxxx>>() { });

主要是红色两行，其它的都是把前端传的值转换成list

说明：该场景只是本人遇到的，在对应的方法类转换，这有可能不适用您，我是偷懒，直接在方法中写，如果不实用，我想您可能要写一个配置文件类了；