"Unrecognized field" Jackson

I'm trying to deserialise a JSON object from this JSON code:

{ 
    "bg" : { 
        "fileName" : "data/gui/mainMenuBg.jpg"
    },
    "startGameBtn" : { 
        "text" : "Start Game",
        "innerWidth" : 100,
        "innerHeight" : 50
    }
}

The object I'm deserialising simply looks like this:

public class MainMenu extends BasicTWLGameState {
    private StateBasedGame app;

    @JsonProperty private Image bg;
    @JsonProperty private Button startGameBtn;
    // [...]
}

I created a mix-in for the base class of the Button class:

public abstract class WidgetMixIn {
    // Not sure why I have to ignore only this when there are other setters that it should complain about...
    @JsonIgnore public abstract boolean setBorderSize(Border border);

    @JsonProperty("innerWidth") public abstract int getInnerWidth();
    @JsonProperty("innerHeight") public abstract int getInnerHeight();

    public abstract void setInnerSize(
            @JsonProperty("innerWidth") int width,
            @JsonProperty("innerHeight") int height);
}

The mix-in for the Button class itself:

public class ButtonMixIn {
    @JsonProperty public String text;
}

The error I'm getting is:

ERROR:Unrecognized field "innerWidth" (Class de.matthiasmann.twl.Button), not marked as ignorable
    at [Source: data\gui\mainMenu.json; line: 7, column: 27] (through reference chain: state.MainMenu["startGameBtn"]->de.matthiasmann.twl.Button["innerWidth"])

Why can it not find the innerWidth开发者_StackOverflow社区 property defined in the Widget mix-in?

Cheers.

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ButtonMixIn class does not have a innerHeight and innerWidth JsonProperty annotation.

If ButtonMixIn class was meant to extend from your defined abstract button class, then you are missing the ButtonMixIn extends WidgetMixIn line.

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The problem is your "setInnerSize()" -- Java bean property setters only allow setting one property at a time; multiple properties can only be used with annotated constructors. So you need to split this into two separate setters.

For what it is worth, there is a feature enhacement request to let Jackson use multi-argument setters, but current versions do not support that yet.