Can not deserialize instance of java.lang.Boolean out of START_OBJECT token

最新推荐文章于 2025-03-07 13:51:26 发布

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在使用MQ发送包含实体类的消息时，接收方反序列化遇到问题，报'Can not deserialize instance of java.lang.Boolean out of START_OBJECT token'错误。通过在实体类的Long字段上添加@JsonSerialize和@JsonDeserialize注解，分别指定LongJsonSerializer和LongJsonDeserializer，成功解决了反序列化问题。

使用mq发消息时，消息体使用一个实体类接收，消息接收方反序列化时总是报错：

2019-10-10 13:29:34.609 [mro: e0ff3fbce8cfa095][http-nio-8002-exec-7] ERROR com.runlion.sat.tools.handler.ExceptionHandler - >>>>>>>>> 全局异常 JSON parse error: Can not deserialize instance of java.lang.Boolean out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.Boolean out of START_OBJECT token
 at [Source: java.io.PushbackInputStream@27ba128; line: 1, column: 1] >>>>>>>>>>>>>>

1. 发送消息

//发送占用库存消息
        OccupyTypeDTO occupyTypeDTO = new OccupyTypeDTO();
        occupyTypeDTO.setId(sendOrderMainId);
        occupyTypeDTO.setType(1);
        occupyTypeDTO.setUserId(LoginUserUtil.getLoginUserId());
        MqDTO mqDTO = new MqDTO();
        mqDTO.setMqTypeEnum(OCCUPYSTRATEGY);
        mqDTO.setData(JSONObject.toJSONString(occupyTypeDTO));

        if (!mqProducerApi.producer(mqDTO)){
            distributedLocker.unlock(String.valueOf(LockTypeEnum.SEND_ORDER_MAIN.getCode()) + sendOrderMainId);
            throw new BaseException("发送占用库存消息失败");
        }

2. 实体类OccupyTypeDTO

@Data
public class OccupyTypeDTO implements Serializable {
    private Integer type;
    private Long id;
    private Long userId;
}

3. 消息接收方：

增加注解@RequestBody

public boolean occupyLocation(@RequestBody String data) {

        OccupyTypeDTO occupyTypeDTO = JSON.parseObject(data, OccupyTypeDTO.class);
        boolean boo = false;
        //业务处理
        return boo;
    }

这样就会报错。

修改实体类OccupyTypeDTO，增加注解

@JsonSerialize(using = LongJsonSerializer.class)
@JsonDeserialize(using = LongJsonDeserializer.class)

@Data
public class OccupyTypeDTO implements Serializable {
    private Integer type;

    /**id**/
    @JsonSerialize(using = LongJsonSerializer.class)
    @JsonDeserialize(using = LongJsonDeserializer.class)
    private Long id;

    @JsonSerialize(using = LongJsonSerializer.class)
    @JsonDeserialize(using = LongJsonDeserializer.class)
    private Long userId;
}

成功。