lombok使用Builder构建器，jackson不能反序列化

 

问题：

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `cn.demo.IdCardRequest` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

 at [Source: (PushbackInputStream); line: 1, column: 2]

at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)

at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1452)

at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1028)

at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1297)

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:4013)

at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3084)

at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:239)

解决：

添加默认构造器

@Data

@Builder

@NoArgsConstructor(access = AccessLevel.PRIVATE)

@AllArgsConstructor(access = AccessLevel.PRIVATE)

public class IdCardRequest {

    private String name;

    private String idCardNbr;

    private String phoneNbr;

}

 

参考：

https://www.jianshu.com/p/b43535068b52  SpringBoot+redis 使用jackson2JsonRedisSerializer序列化时报错

https://www.jianshu.com/p/0d8fc3df3647?from=timeline&isappinstalled=0  通过lombok带你读透Builder构建器