1. 使用rest template发送请求,反序列返回的object时报错.
代码如下:
@Data
@AllArgsConstructor
public class UsageRecordId {
private UUID id;
}
请求如下:
UsageRecordId responseEntity = restTemplate.postForObject(HTTP_LOCALHOST + port + urmPath, requestBody,UsageRecordId.class);
报错如下:
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.sap.ngom.urm.dto.UsageRecordId` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (PushbackInputStream); line: 2, column: 3]
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1592)
at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1058)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1302)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:326)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4218)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3267)
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:273)
... 69 more
原因:jackson在反序列化是需要对象提供默认的构造方法才能实例化
解决办法,假如lombok默认构造方法注解或者加入默认构造方法即可:
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UsageRecordId {
private UUID id;
}