Jackson deserialize GeoJson Point in Spring Boot

Question

I have a @Entity model that has a property of type com.vividsolutions.jts.geom.Point. When I try to render this model in a @RestController

Answer 1

As of 2020 most of the JTS libraries are outdated and no longer work. I found one fork on Maven Central that was updated recently and it worked flawlessly with jackson-core:2.10.0 and jts-core:1.16.1:

implementation 'org.n52.jackson:jackson-datatype-jts:1.2.4'

Sample usage:

    @Test
    void testJson() throws IOException {

        var objectMapper = new ObjectMapper();
        objectMapper.registerModule(new JtsModule());

        GeometryFactory gf = new GeometryFactory();
        Point point = gf.createPoint(new Coordinate(1.2345678, 2.3456789));

        String geojson = objectMapper.writeValueAsString(point);

        InputStream targetStream = new ByteArrayInputStream(geojson.getBytes());
        Point point2 = objectMapper.readValue(targetStream, Point.class);

        assertEquals(point, point2);
    }

You don't need to use any annotations on class fields or register new Spring Beans, just register the JTS module with Jackson.