is this the minimal code to render a shapefile with geotools?

App.java

import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.net.URL;
import javax.imageio.ImageIO;
import org.geotools.data.FeatureSource;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.map.DefaultMapContext;
import org.geotools.map.DefaultMapLayer;
import org.geotools.map.MapContext;
import org.geotools.map.MapLayer;
import org.geotools.renderer.lite.StreamingRenderer;
import org.geotools.styling.SLDParser;
import org.geotools.styling.Style;
import org.geotools.styling.StyleFactory;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

/**
 * Hello world!
 *
 */
public class App {
    public static void main(String[] args) throws Exception {
        StyleFactory styleFactory = CommonFactoryFinder.getStyleFactory(null);
        SLDParser parser = new SLDParser(styleFactory, new URL("file:///home/dwins/Projects/geoserver/data/release/styles/popshade.sld"));
        Style style = parser.readXML()[0];

        ShapefileDataStore shapefile =
            new ShapefileDataStore(new URL("file:///home/dwins/Projects/geoserver/data/release/data/shapefiles/states.shp"));
        FeatureSource<SimpleFeatureType, SimpleFeature> features =
            shapefile.getFeatureSource(shapefile.getTypeNames()[0]);

        MapContext context = new DefaultMapContext(new MapLayer[]{
            new DefaultMapLayer(features, style)
        });

        BufferedImage image = new BufferedImage(300, 300, BufferedImage.TYPE_INT_ARGB);
        Graphics2D graphics = image.createGraphics();
        Rectangle screenArea = new Rectangle(0, 0, 300, 300);
        ReferencedEnvelope mapArea = features.getBounds();

        StreamingRenderer renderer = new StreamingRenderer();
        renderer.setContext(context);
        renderer.paint(graphics, screenArea, mapArea);

        ImageIO.write(image, "png", new File("/home/dwins/states.png"));
    }
}