UnrecognizedPropertyException when using jackson inheritance

When I am using jackson inheritance thru @JsonTypeInfo the common field for whole inheritance model, which is defined inside annotation leads to UnrecognizedPropertyException during serialization. To avoid this, I have to explicitly create setProperty() method in POJO what I do not want to do, due to I then just have 2 copies of the field: one from annotation and second in my POJO class, sure I can ignore one of them but then this inheritance model looks weird. As a workaround I can annotate my POJO with @JsonIgnoreProperties(ignoreUnknown = true), but in some cases I need to have ignoreUnknown = false and this workaround will not work.

@JsonIgnoreProperties(ignoreUnknown = true)
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
@JsonSubTypes({
        @JsonSubTypes.Type(value = TypeOne.class,
            name = "ONE"),
        @JsonSubTypes.Type(value = TypeTwo.class,
            name = "TWO")
    })
public class AbstractType{}

public class TypeOne
    extends AbstractType{}

public class TypeTwo
    extends AbstractType{}  

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "type" (class TypeOne), not marked as ignorable (0 known properties: ])

[cowtowncoder]

This is because for some reason you added visible="true" in there – that exposes “type” property to deserializer. Perhaps you just copy-pasted @JsonTypeInfo from an existing POJO?

Anyway, since visible defaults to false, you can just remove it from the declaration (or set to false if you prefer explicitness).

[cowtowncoder]

Ok no problem. Glad it works. I understand that property name itself is ambiguous and could lead to assumption that visibility would refer to inclusion (or not) in JSON serialization.