There is undefined NullPointerException in method createCompatibleVolatileImage,
when parameter transparency has illegal value.
Note: I test this only on linux machine.
See next example:
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import java.awt.*;
import java.awt.image.*;
class Test {

    public static void main(String[] args) {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice dsd = ge.getDefaultScreenDevice();
        GraphicsConfiguration gc = dsd.getDefaultConfiguration();

        int[] transparency = { Integer.MIN_VALUE, -1, 0, 4, Integer.MAX_VALUE };
        for (int t = 0; t < transparency.length; t++) {
                try {
                    System.out.println("VolatileImage will be created with transparency = "
                            + transparency[t]);
                    VolatileImage vi = gc.createCompatibleVolatileImage(
                            10, 10, transparency[t]);
                    System.out.println("VolatileImage was created with transparency = "
                            + transparency[t]);
                } catch (IllegalArgumentException e) {
                } catch (NullPointerException e) {
                    System.out.println("Unexpected NullPointer Exception ");
                }
        }
    }
}
###@###.### 10/28/04 14:17 GMT