[英]Jackson & JSONAnySetter: NullPointer Exception during Serialization/Deserialization
[英]Serialization and Deserialization with Jackson Exception
作為答案的JSON嵌套類數據綁定 ,當我序列化和反序列化容器時,我得到了這個異常:
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
只需刪除或重命名type
字段的setter / getter即可
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;
}
測試
String json = "{\"type\":\"cat\", \"animal\" : {\"name\":\"cat-mew\" }}";
Container val = o.readValue(json, Container.class);
System.out.println(o.writeValueAsString(val));
輸出是
{"animal":{"name":"cat-mew"},"type":"cat"}
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