Jackson JsonTypeInfo.As.EXTERNAL_PROPERTY doesn’t work as expected

by

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.

More Related Contents:

  1. Convert a Map to a POJO
  2. JSON Invalid UTF-8 middle byte
  3. Deserialize JSON with Jackson into Polymorphic Types – A Complete Example is giving me a compile error
  4. Representing null in JSON
  5. How do I exclude fields with Jackson not using annotations?
  6. Java: Jackson polymorphic JSON deserialization of an object with an interface property?
  7. REST with Spring and Jackson full data binding
  8. JSON parse error: Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value
  9. How to use jackson to deserialize to Kotlin collections
  10. Small Example of Jackson Scala Module?
  11. Unable to find a MessageBodyReader of content-type application/json and type class java.lang.String
  12. Spring @ResponseBody Jackson JsonSerializer with JodaTime
  13. include class name in all objects serialized by jackson
  14. Is there a streaming API for JSON? [closed]
  15. Convert JSON format to CSV format for MS Excel [closed]
  16. Could not load file or assembly ‘Newtonsoft.Json’ or one of its dependencies. Manifest definition does not match the assembly reference
  17. Disable Hypertext Application Language (HAL) in JSON?
  18. Jackson Change JsonIgnore Dynamically
  19. Query a JSONObject in java
  20. JPA Transient Annotation and JSON
  21. Post a json body with swagger
  22. Removing JSON elements with jackson
  23. Convert a JSON array to a bash array of strings
  24. How to parse json and read in vb.net
  25. Spring REST service: retrieving JSON from Request
  26. Jackson @JsonProperty(required=true) doesn’t throw an exception
  27. Only allow properties that are declared in JSON schema
  28. Can Server Sent Events (SSE) with EventSource pass parameter by POST
  29. Typescript `enum` from JSON string
  30. Convert JsonNode into POJO

Leave a Comment