Serializing different objects in one class that implements IsSerializable

[coffeMan]

I created a class that implements IsSerializable.  I am using Polygon and LatLng within this class called BoundingBox.  I am getting issues with no being able to instantiate Polygon without a constructor.  Do you create a separate Polygon class?

[ERROR] com.google.gwt.maps.client.overlay.Polygon has no available instantiable subtypes.

                                                                                   &

  [ERROR] subtype com.google.gwt.maps.client.overlay.Polygon is not default instantiable (it must have a zero-argument constructor or no constructors at all) and has no custom serializer. 

Can anyone point me in the right direction???

Thanks!

public class BoundingBox implements IsSerializable {

    private LatLng Coordinate_One;

    private LatLng Coordinate_Two;

    private LatLng Coordinate_Three;

    private LatLng Coordinate_Four;

    private Polygon poly;

    public BoundingBox() {        

    }        

    

    public Polygon getPoly() {

        return poly;

    }

    public void setPoly(Polygon poly) {

        this.poly = poly;

    }   

    public Polygon CreatePolygon(BoundingBox bbox) // param = file type object

    {

        LatLng[] polyOverlay = new LatLng[5];

        polyOverlay[0] = LatLng.newInstance(bbox.getCoordinate_One()

                .getLatitude(), bbox.getCoordinate_One().getLongitude());

        polyOverlay[1] = LatLng.newInstance(bbox.getCoordinate_Two()

                .getLatitude(), bbox.getCoordinate_Two().getLongitude());

        polyOverlay[2] = LatLng.newInstance(bbox.getCoordinate_Three()

                .getLatitude(), bbox.getCoordinate_Three().getLongitude());

        polyOverlay[3] = LatLng.newInstance(bbox.getCoordinate_Four()

                .getLatitude(), bbox.getCoordinate_Four().getLongitude());

        polyOverlay[4] = LatLng.newInstance(bbox.getCoordinate_One()

                .getLatitude(), bbox.getCoordinate_One().getLongitude());

        this.poly = new Polygon(polyOverlay);

        return poly;

    }

 public LatLng getCoordinate_One() {

        return Coordinate_One;

    }

    public void setCoordinate_One(LatLng coordinate_One) {

        Coordinate_One = coordinate_One;

    }...etc for the rest of the sets/gets

[Paul Robinson]

You don't show the Polygon class, but from the error it looks like you haven't provided a zero-argument constructor. It must have one, even if it's private and you never call it. GWT-RPC needs it for anything that it serializes.

Paul

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[Nick Matviko]

ok so for my createpolygon method i just make that private? You cant make a private constructor of an object in another class, or can you?  And for the polygon class being shown, i am just importing import com.google.gwt.maps.client.overlay.Polygon this. 

[Jens]

The Polygon class is a JavaScriptOverlay type provided by Google and it does not have a no-arg constructor, so you can't use it with GWT-RPC. Other than that I assume you can't use JSO's on server side either (How should JSNI work on server side?) so it does not make sense to use them in a serializable class. 

-- J.

[Nick Matviko]

Ok, so with that being said, ill need to create my own LatLng and Polygon objects? or?

On Fri, Sep 21, 2012 at 8:19 AM, Jens <jens.ne...@gmail.com> wrote:

The Polygon class is a JavaScriptOverlay type provided by Google and it does not have a no-arg constructor, so you can't use it with GWT-RPC. Other than that I assume you can't use JSO's on server side either (How should JSNI work on server side?) so it does not make sense to use them in a serializable class. 

-- J.

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