WritableRaster.setPixel throw NullPointerException when the SampleModel has data
type SHORT, FLOAT and DOUBLE.

import java.awt.Point;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.awt.image.DataBuffer;
import java.awt.image.PixelInterleavedSampleModel;

class Bug_RasterSetPixel {
  public static void main(String args[]) {
    int dt[] =
    {
      DataBuffer.TYPE_BYTE,
      DataBuffer.TYPE_USHORT,
      DataBuffer.TYPE_INT,
      DataBuffer.TYPE_SHORT,
      DataBuffer.TYPE_FLOAT,
      DataBuffer.TYPE_DOUBLE,
    };
    String dtStr[] =
    {
      "BYTE : ",
      "USHORT : ",
      "INT : ",
      "SHORT : ",
      "FLOAT : ",
      "DOUBLE : ",
    };
    for(int i = 0; i < dt.length; i++) {
      PixelInterleavedSampleModel sm =
        new PixelInterleavedSampleModel(dt[i], 100, 100,
        3, 3*100, new int[] {2,1,0});
      WritableRaster ras =
        Raster.createWritableRaster(sm, new Point(0, 0));
      try {
        ras.setPixel(0, 0, new int[] {45,45,45});
        System.out.println(dtStr[i] + "OK");
      } catch(Exception e) {
        System.out.println(dtStr[i] + e);
      }
    }
  }
}