com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field

开发过程中经常会出现接口返回的字符串要转化为实体类对象，但是实体类中的字段有可能不完整 ，解析json串为实体对象的时候就会报错 com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field

异常反复出现

Exception in thread "Thread-62" java.lang.IllegalArgumentException: Unrecognized field "y_value" (class org.jeecg.modules.system.entity.KafkaGasDensity), not marked as ignorable (12 known properties: "productKey", "createdTime", "devNo", "yvalue", "deviceKey", "type", "id", "evalue", "time", "areaNo", "lvalue", "timestamp"])
 at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: org.jeecg.modules.system.entity.KafkaGasDensity["y_value"])
	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4236)
	at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4167)
	at org.jeecg.kafka.KafkaConsumerClient.run(KafkaConsumerClient.java:95)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "y_value" (class org.jeecg.modules.system.entity.KafkaGasDensity), not marked as ignorable (12 known properties: "productKey", "createdTime", "devNo", "yvalue", "deviceKey", "type", "id", "evalue", "time", "areaNo", "lvalue", "timestamp"])
 at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: org.jeecg.modules.system.entity.KafkaGasDensity["y_value"])
	at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:855)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1212)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1604)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1582)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:299)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:156)
	at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4231)
	... 3 more

使用转译的代码

  JSONObject jsonObject = JSONObject.parseObject(record.value());
                        Object data = jsonObject.get("data");
                        String deviceKey = String.valueOf(jsonObject.get("deviceKey"));
                        String productKey = String.valueOf(jsonObject.get("productKey"));
                        Long timestamp = Long.parseLong(String.valueOf(jsonObject.get("timestamp")));
                        String type = String.valueOf(jsonObject.get("type"));

                        ObjectMapper objectMapper = new ObjectMapper();
                        if ("power222".equals(record.topic())) {
                            KafkaSmartElectricity kafkaSmartElectricity = objectMapper.convertValue(data, KafkaSmartElectricity.class);
                            long nowSecond = DateUtil.nowSecond();
                            long startSecond = DateUtil.todaySecondInClock000();
                            kafkaSmartElectricity.setId(startSecond);
                            kafkaSmartElectricity.setCreatedTime(nowSecond);
                            kafkaSmartElectricity.setDeviceKey(deviceKey);
                            kafkaSmartElectricity.setProductKey(productKey);
                            kafkaSmartElectricity.setTimestamp(timestamp);
                            kafkaSmartElectricity.setType(type);
                            playData(getElectricitySqls(kafkaSmartElectricity));
                        }

解决方案

加在实体类上忽略解析字段注解 @JsonIgnoreProperties(ignoreUnknown = true)

目的：防止json字符串转成实体对象时因未识别字段报错

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@TableName(value = "kafka_smart_weather")
@JsonIgnoreProperties(ignoreUnknown = true)
public class KafkaSmartWeather {
    @TableId(value = "id", type = IdType.INPUT)
    private Long id;
。。。