I am trying to integrate some java code into my Processing application.  I am running into a problem when attempting to Run the code. I have imported all of my .java files into my Processing project and I get the following error when trying to run: "Cannot find anything named RGB". I am pretty sure it's because I haven't imported the correct Processing library into my .java code. Could someone help me with this? Thank you in advance. Here is the .java class I am having trouble with:

import processing.core.*;
import processing.xml.*;

//HordeAlien is a subclass of Alien
//HordeAlien is used to create aliens of the horde type.
public class HordeAlien extends Alien
{
 protected PImage alienImage;
 
 //CONSTRUCTORS
 HordeAlien( int x, int y )
 {
   super( x, y );
   setBoundary();
   createAlienImage();
 }
 
 protected void createAlienImage()
 {
   alienImage = createImage( 20, 20, RGB );
   
   alienImage.loadPixels();
   for( int i = 0; i < pixels.length; i++ )
   {
     alienImage.pixels[i] = color( 255, 0, 0 );
   }
   alienImage.upDatePixels();
 }
 
 public void display()
 {
   image( alienImage, getX(), getY() );
 }
 
 protected void setBoundary()
 {
   boundary = new CollisionBoundary(
                   getX() - 20,
                   getY() - 20,
                   getX() + 20,
                   getY() + 20 );
 }
 
 public CollisionBoundary getBoundary()
 {
   return boundary;
 }
}