我使用 Jackson ObjectMapper 将对象层次结构序列化为 json String。之后我想反序列化对象。我有如下异常。
重要的是APINewDealArrangementImpl类层次结构超出了我的更改范围——它是外部库的一部分。在这种情况下，我无法实现默认构造函数，也无法使用@JsonCreatorannotion。
如何避免“找不到合适的构造函数”异常？是否可以使用TypeResolverBuilderJackson API 中的一些自定义实现或其他功能来解决这个问题？感谢帮助。
org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.tzero.api.transactions.TransactionState]: can not instantiate from JSON object (need to add/enable type information?)
at [Source: java.io.StringReader@57ac3379; line: 4, column: 5] (through reference chain: com.tzero.api.java.transactions.APINewDealArrangementImpl["state"])
at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObjectUsingNonDefault(BeanDeserializer.java:746)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:683)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580)
at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:299)
at org.codehaus.jackson.map.deser.SettableBeanProperty$MethodProperty.deserializeAndSet(SettableBeanProperty.java:414)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:697)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2732)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1863)