The code below crashes on Unix:

import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.Robot;

public class CrashRobot {

     public static void main(final String[] args) throws Exception {
         final GraphicsDevice gd = new GraphicsDevice() {
             @Override
             public int getType() {
                 return TYPE_RASTER_SCREEN;
             }

             @Override
             public String getIDstring() {
                 return "Custom screen device";
             }

             @Override
             public GraphicsConfiguration[] getConfigurations() {
                 return new GraphicsConfiguration[0];
             }

             @Override
             public GraphicsConfiguration getDefaultConfiguration() {
                 return null;
             }
         };

         final Robot r = new Robot(gd);
         r.getPixelColor(0, 0);
     }
}

On macOS the java.lang.ClassCastException is occured.