Serialize Generic Collection Issues

[Yosvany Llerena Rodríguez]

Hi

I have some issues with polymorphic collecction serialization and I'm not able to find the problem. 

I have this "type" external property defined, but I'm not able to see it on my response output

Example a DarkObjectInstance serializes like 

{"fields":[], "connections": "AB+/-E} and should be {"type":"dark", "fields":[], "connections": "AB+/-E} 

UnknownObjectInstance will be:

{"fields":[], "primitives": [{"deck":"S"}]} and should be {"type":"unknown", "fields":[], "primitives": [{"deck":"S"}]}

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXTERNAL_PROPERTY, property = "type", visible = true)

@JsonSubTypes({

        @JsonSubTypes.Type(value = DarkObjectInstance.class, name = "dark"),

        @JsonSubTypes.Type(value = UnknownObjectInstance.class, name = "unknown")})

public abstract class ObjectInstance implements Serializable {

    private static final long serialVersionUID = -8515880933242237477L;

     private List<String> fields;

}

public class DarkObjectInstance extends ObjectInstanceDto {

   private String connections;

...

}

public class UnknownObjectInstance extends ObjectInstanceDto {

   private List<Anchored> primitves;

...

}

Any help will be apreciated

BR

[Tatu Saloranta]

One problem I see is the use of `As.EXTERNAL_PROPERTY`: this is not
what you want based on expected json structure.
Instead you probably just want to use plain `As.PROPERTY` (unless you
want to also map it to a regular, existing property, in which case
`As.EXISTING_PROPERTY` may be more appropriate).

-+ Tatu +-

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[Yosvany Llerena Rodríguez]

HI

I do change as you recommend but results are the same. Nothing changes, the property continues not appearing.

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)

@JsonSubTypes({

        @JsonSubTypes.Type(value = DarkObjectInstance.class, name = "dark"),

        @JsonSubTypes.Type(value = UnknownObjectInstance.class, name = "unknown")})

public abstract class ObjectInstance implements Serializable {

    private static final long serialVersionUID = -8515880933242237477L;

     private List<String> fields;

}

Br

[Tatu Saloranta]

Ok, assuming this is with a reasonably up-to-date version (2.8.6 or 2.7.8), at this point it would make sense to file a bug report, with simple reproduction at:

https://github.com/FasterXML/jackson-databind/issues

 `type` property should be serialized given information you have given, as far as I can see.

-+ Tatu +-

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[Yosvany Llerena Rodríguez]

Thank @Tatu. Sorry abut the delay. I will be back as soon as I test moving from 2.8.0 to 2.8.6.

BR