Jackson JsonTypeInfo.As.EXTERNAL_PROPERTY doesn't work as expected
From Javadoc:
Inclusion mechanism similar to PROPERTY, except that property is included one-level higher in hierarchy, i.e. as sibling property at same level as JSON Object to type. Note that this choice can only be used for properties, not for types (classes). Trying to use it for classes will result in inclusion strategy of basic PROPERTY instead.
Noticed that can only be used for properties
is bolded. Source: JsonTypeInfo.As.EXTERNAL_PROPERTY.
So, you have to move all annotation from Info
class to property info
or setInfo
method in Response
class.
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXTERNAL_PROPERTY, property = "type")@JsonSubTypes(value = { @JsonSubTypes.Type(value = Type1Info.class, name = "type1"), @JsonSubTypes.Type(value = Type2Info.class, name = "type2") })public void setInfo(Info info) { this.info = info;}
For me, you should also remove type
property from Response
class. It will be generated dynamically during serialization process. In deserialization you do not need it because Jackson cares about types. Your class could look like this:
class Response { private String status; private Info info; //getters, setters}
See also this question: JSON nest class data binding.