When bandMasks of createPackedRaster is null, a NullPointerException is thrown.
But when bandMasks does exist with zero element, there is no exception thrown. I think there should be some sort of exception thrown since either case has essentially the same effect.

The following program can be used to illustrate this behaviour.

import java.awt.Point;
import java.awt.image.DataBuffer;
import javax.media.jai.RasterFactory;
class Bug_createPackedRaster_i3__12 {
  public static void main(String args[]) {
    System.out.println("\nWhen bandMasks is null :");
    try {
      RasterFactory.createPackedRaster(DataBuffer.TYPE_BYTE, 12, 34,
        null, new Point(7,8));
      System.out.println("No exception thrown.");
    } catch(Exception e) {
      System.out.println(e);
    }
    System.out.println("\nWhen bandMasks has zero element :");
    try {
      RasterFactory.createPackedRaster(DataBuffer.TYPE_BYTE, 12, 34,
        new int[]{}, new Point(7,8));
      System.out.println("No exception thrown.");
    } catch(Exception e) {
      System.out.println(e);
    }
  }
}

--------------------------
daniel.rice@Eng 1999-01-04

The JAI methods simply call Raster.createPackedRaster with identical
arguments. So Java2D should check for a zero-length bandMasks
parameter.

The test program, modified to use only JDK1.2 classes, is as follows:

import java.awt.Point;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
class Bug_createPackedRaster_i3__12 {
  public static void main(String args[]) {
    System.out.println("\nWhen bandMasks is null :");
    try {
      Raster.createPackedRaster(DataBuffer.TYPE_BYTE, 12, 34,
        null, new Point(7,8));
      System.out.println("No exception thrown.");
    } catch(Exception e) {
      System.out.println(e);
    }
    System.out.println("\nWhen bandMasks has zero element :");
    try {
      Raster.createPackedRaster(DataBuffer.TYPE_BYTE, 12, 34,
        new int[]{}, new Point(7,8));
      System.out.println("No exception thrown.");
    } catch(Exception e) {
      System.out.println(e);
    }
  }
}