我正在使用Jackson的@JsonIdentityInfo
註釋來生成漂亮的對象圖。null當使用@JsonIdentityInfo時的ID在反序列化期間失敗
我有以下對象(這是一個Hibernate實體也):
@Entity
@JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class,
property="id")
public class MemberFieldDef implements Def
{
@Id @GeneratedValue(generator="myGen")
private String id;
....
}
該類序列化過程中正常工作,對象圖的時候一部分,但是當我想提出一個新的,臨時實體通過傑克遜,其不具有ID還與具有
{
"id":null,
...
}
反序列化失敗:
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of VALUE_NULL token
at [Source: [email protected]; line: 1, column: 2] (through reference chain: net._95point2.sarbase.cohort.entity.MemberFieldDef["id"])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:762)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:59)
at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:12)
at com.fasterxml.jackson.databind.deser.impl.ObjectIdValueProperty.deserializeSetAndReturn(ObjectIdValueProperty.java:90)
at com.fasterxml.jackson.databind.deser.impl.ObjectIdValueProperty.deserializeAndSet(ObjectIdValueProperty.java:82)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:306)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeWithObjectId(BeanDeserializerBase.java:1036)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:122)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3066)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2221)
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:205)
Stacktrace顯示Jackson沒有使用常規的StringDeserializer--它對null的返回值爲空 - 但使用的是ObjectIdValueProperty
,它似乎不允許空值。
是否有解決瞬態物體的問題?
嗨!你(有沒有)找到任何解決方案? – LeoLozes
只有發送一個已知的佔位符,如「NO_ID」或-1,才能在持續存在之前被刪除的電線....不是最好的:/ –