Why can't this code produce a points layer in GeoTools - gis

Question

I am testing adding a collection of points to a map utilizing the Geotools API. I've been following this example as best I could Problem creating a point and adding it to FeatureCollection, as the example code is old, and things like FeatureCollections is deprecated. I tried using DefaultFeatureCollection instance instead, and I am not sure if I am using it correctly, and that is why the points do not appear on the map. What am I doing wrong? Here is some of my code:
private void plotMarkers() {
final SimpleFeatureType TYPE = this.createFeatureType();
final SimpleFeatureBuilder BLDR = new SimpleFeatureBuilder(TYPE);
DefaultFeatureCollection features = new DefaultFeatureCollection();
// arbitrary start position
Coordinate pos = new Coordinate(0, 0);
final double pointSpacing = 1.0;
String title = "Test";
features.add(creatureFeature(BLDR, pos, title));
// display points on screen
Style style = SLD.createPointStyle("circle", Color.RED, Color.RED, 1.0f, 5.0f);
Layer layer = new FeatureLayer(features, style);
this.getMapContent().addLayer(layer);
}

Answer 1

Maybe this can help you to make it work
private MapContent map;
private static Style pointStyle = SLD.createPointStyle("Circle", Color.RED, Color.RED, 0.5f, POINT_SIZE);
public static void CreatePoints(double X, double Y){
createPointLayer();
createFeatures(X,Y);
}
static void createFeatures(double X, double Y) {
Point point = geometryFactory.createPoint(new Coordinate(X, Y));
pointCollection.add(SimpleFeatureBuilder.build(pointType, new Object[]{point}, null));
//create map layer event
MapLayerEvent mple = new MapLayerEvent(pointLayer, MapLayerEvent.DATA_CHANGED);
//create maplayer list event
MapLayerListEvent mplle = new MapLayerListEvent(map, pointLayer, map.layers().indexOf(pointLayer), mple);
okvir.mapPane.layerChanged(mplle);
System.out.println(MessageFormat.format("Created Point: {0}", point));
}
private static void createPointLayer() {
if (pointType == null) {
pointFeatureTypeBuilder.setName("PointCreated");
pointFeatureTypeBuilder.setCRS(map.getCoordinateReferenceSystem());
pointFeatureTypeBuilder.add("the_geom", Point.class);
pointType = pointFeatureTypeBuilder.buildFeatureType();
pointCollection = new DefaultFeatureCollection(null, pointType);
}
pointLayer = new FeatureLayer(pointCollection, pointStyle);
map.addLayer(pointLayer);
}