JtsShapeFactory MultipolygonBuilder fails to validate shape

Start by running the provided reproduction, then inspect JtsShapeFactory.MultipolygonBuilder and the ShapeDeserializer and GeometryDeserializer paths that use it. Done means invalid multipolygons are rejected consistently rather than being constructed successfully.

It is possible to create invalid shapes through the JtsShapeFactory.MultipolygonBuilder.

You can reproduce by running the following class:

import org.locationtech.spatial4j.context.jts.JtsSpatialContext;
import org.locationtech.spatial4j.context.jts.JtsSpatialContextFactory;
import org.locationtech.spatial4j.exception.InvalidShapeException;
import org.locationtech.spatial4j.shape.jts.JtsShapeFactory;

public class Main {

    public static void main(String[] args) throws Exception {
        JtsSpatialContextFactory ctxFactory = new JtsSpatialContextFactory();
        ctxFactory.geo = false;
        ctxFactory.useJtsLineString = true;
        ctxFactory.useJtsMulti = true;
        ctxFactory.useJtsPoint = true;
        JtsSpatialContext ctx = new JtsSpatialContext(ctxFactory);
        JtsShapeFactory shapeFactory = new JtsShapeFactory(ctx, ctxFactory);

        JtsShapeFactory.PolygonBuilder polygonBuilder = shapeFactory.polygon()
                .pointLatLon(1, 1)
                .pointLatLon(-1, -1)
                .pointLatLon(1, -1)
                .pointLatLon(-1, 1)
                .pointLatLon(1, 1);

        try {
            polygonBuilder.build();
            System.out.println("OK");
        } catch (InvalidShapeException e) {
            System.out.println("KO: " + e.getMessage());
        }
        try {
            shapeFactory.multiPolygon().add(polygonBuilder).build();
            System.out.println("OK");
        } catch (InvalidShapeException e) {
            System.out.println("KO: " + e.getMessage());
        }
    }

}

Output:

KO: Self-intersection at or near point (0.0, 0.0, NaN)
OK

The JtsShapeFactory.MultipolygonBuilder is used in the ShapeDeserializer and GeometryDeserializer classes and can lead jackson to create invalid shapes.