FULL PRODUCT VERSION :
java version "1.5.0_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Client VM (build 1.5.0_03-b07, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
An attempt to create a WritableRaster via Raster.createWritableRaster(SampleModel sm, DataBuffer db, Point location) using a custom DataBuffer causes an erroneous RasterFormatException.
Apparently the reason for this bug is that IntegerComponentRaster insists on beeing passed an instance of DataBufferInt rather than just a DataBuffer with a DataType of TYPE_INT.
This is quite annoying since DataBufferInt is declared final and thus cannot be extended.

Also note that none of the specified reasons for a RasterFormatException apply: width and height are within bounds and my DataBuffer has only one bank.



ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.awt.image.RasterFormatException: IntegerComponentRasters must haveinteger DataBuffers

at sun.awt.image.IntegerComponentRaster.<init>(IntegerComponentRaster.java:155)

at sun.awt.image.IntegerInterleavedRaster.<init>(IntegerInterleavedRaster.java:111)

at sun.awt.image.IntegerInterleavedRaster.<init>(IntegerInterleavedRaster.java:78)

at java.awt.image.Raster.createWritableRaster(Raster.java:994)

at RasterBug.<init>(RasterBug.java:17)

at RasterBug.main(RasterBug.java:69)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.image.*;
import java.awt.*;

public class RasterBug
{
public RasterBug()
{
int w = 100, h = 100;
ColorModel cm = new DirectColorModel(24, 0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
SampleModel sm = cm.createCompatibleSampleModel(w,h);
System.out.println(sm+", WIDTH="+sm.getWidth()+", HEIGHT="+sm.getHeight());
DataBuffer db = new MyDataBufferInt(w * h);
System.out.println(db+", BANKS="+db.getNumBanks());

try {
WritableRaster wr = Raster.createWritableRaster(sm, db, new Point(0,0));
BufferedImage bim = new BufferedImage(cm, wr, true, null);
System.out.println(bim);
} catch(Exception ex) {
ex.printStackTrace();
}

try {
//workaround
WritableRaster wr = new MyWritableRaster(sm, db, new Point(0,0));
BufferedImage bim = new BufferedImage(cm, wr, true, null);
System.out.println(bim);
} catch(Exception ex) {
ex.printStackTrace();
}
}

// copied from DataBufferInt
private final class MyDataBufferInt extends DataBuffer
{
int data[];
int bankdata[][];
public MyDataBufferInt(int size)
{
super(TYPE_INT,size);
data = new int[size];
bankdata = new int[1][];
bankdata[0] = data;
}
public int getElem(int i) {
return data[i+offset];
}
public int getElem(int bank, int i) {
return bankdata[bank][i+offsets[bank]];
}
public void setElem(int i, int val) {
data[i+offset] = val;
}
public void setElem(int bank, int i, int val) {
bankdata[bank][i+offsets[bank]] = (int)val;
}
}

private final class MyWritableRaster extends WritableRaster
{
public MyWritableRaster(SampleModel sampleModel, DataBuffer dataBuffer, Point origin)
{
super(sampleModel, dataBuffer, origin);
}
}

public static void main(String[] args)
{
RasterBug bimbug = new RasterBug();
}

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Using WritableRaster does work, requires extending the WritableRaster class though because the constuctor methods are protected.