杰克逊异常的序列化和反序列化 [英] Serialization and Deserialization with Jackson Exception
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问题描述
JSON嵌套类数据绑定
作为答案,当我序列化和反序列化容器我得到了这个异常:
JSON nest class data binding as the answer did, When I Serialization and Deserialization the Container I got this exception:
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not find a Value deserializer for abstract type [simple type, class com.xiaonei.wap.ps.model.Container]
at org.codehaus.jackson.map.deser.StdDeserializerProvider._handleUnknownValueDeserializer(StdDeserializerProvider.java:321)
at org.codehaus.jackson.map.deser.StdDeserializerProvider.findValueDeserializer(StdDeserializerProvider.java:116)
at org.codehaus.jackson.map.deser.StdDeserializer.findDeserializer(StdDeserializer.java:260)
at
推荐答案
只需删除或重命名setter / getter for type
field
Simply remove or rename setter/getter for type
field
public class Container
{
private AAnimal animal;
public AAnimal getAnimal()
{
return animal;
}
@JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include=JsonTypeInfo.As.EXTERNAL_PROPERTY, property="type")
@JsonSubTypes({ @Type(value = Cat.class, name = "cat"), @Type(value = Dog.class, name = "dog") })
public void setAnimal(AAnimal animal)
{
this.animal = animal;
}
}
public abstract class AAnimal
{
public String name;
}
test
String json = "{\"type\":\"cat\", \"animal\" : {\"name\":\"cat-mew\" }}";
Container val = o.readValue(json, Container.class);
System.out.println(o.writeValueAsString(val));
输出
{"animal":{"name":"cat-mew"},"type":"cat"}
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