Derived classes without @ApiModel annotation are not added to Swagger definition

[tomtit]

Swagger version is 1.5.2 (the same issue in 1.5.4-SNAPSHOT).
Derived classes (UrlProperty and ValueProperty) from the listing below are not added to Swagger definition:

@ApiModel("MyProperty")
@JsonSubTypes({@JsonSubTypes.Type(value = UrlProperty.class), @JsonSubTypes.Type(value = ValueProperty.class)})
public static abstract class AbstractProperty {
    final String type;

    protected AbstractApiProperty(String type) {
        this.type = type;
    }

    public String getType() {
        return type;
    }
}

public static class UrlProperty extends AbstractProperty {
    final URL url;

    public UrlProperty(String type, String url) {
        super(type);
        try {
            this.url = new URL(url);
        } catch (MalformedURLException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public URL getUrl() {
        return url;
    }
}

public static class ValueProperty extends AbstractProperty {
    final String value;

    public ValueProperty(String type, String value) {
        super(type);
        this.value = value;
    }

    public String getValue() {
        return value;
    }
}

To get UrlProperty and ValueProperty in Swagger definition I have to remove the @ApiModel annotation from the declaration of the base class (AbstractProperty) or add @ApiModel without arguments to all derived classes.