I am maintaining a software that we need to pass an object of this type:

org.geolatte.geom.Point<org.geolatte.geom.G2D>,

I have customized deserialiser as such:

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import org.geolatte.geom.G2D;
import org.geolatte.geom.Point;
import org.geolatte.geom.builder.DSL;
import org.geolatte.geom.crs.CoordinateReferenceSystem;
import static org.geolatte.geom.crs.CoordinateReferenceSystems.WGS84;
import static org.geolatte.geom.builder.DSL.g;
import static org.geolatte.geom.builder.DSL.point;

import java.io.IOException;

// public class PointG2DDeserializer {
public class PointG2DDeserializer extends JsonDeserializer<Point<G2D>> {
   @Override
    public Point<G2D> deserialize(JsonParser p, DeserializationContext ctx) throws IOException {
        System.out.println("XXXXXX 1 PointG2DDeserializer.deserialize invoked,WGS84="+WGS84 +",p="+p.toString());

        try {
            JsonNode node = p.getCodec().readTree(p);
            JsonNode coordinates = node.get("coordinates");

            if (coordinates == null) {
                System.out.println("XXXXXX 2 coordinates node is null");
                return point(WGS84, new G2D(0.1, 0.2));
            } else {
                double x = coordinates.get(0).asDouble();
                double y = coordinates.get(1).asDouble();
                System.out.println("XXXXXX 3 coordinates node is not null");
                return point(WGS84, new G2D(x, y));
            }
        } catch (Exception e) {
            System.out.println("XXXXXX 4 Error during deserialization: " + e.getMessage());
            e.printStackTrace();
            throw e;
        }
    }
}

I know my request message definitely has “coordinates” JSON element, but above function always output:

XXXXXX 2 coordinates node is null

Anybody has any idea?