Step to reproduce:
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1) Run the attached program
  java -splash:animdog.gif GetSetImageUrlTest

You can see a dog animation on the screen, after a while you can see java cup is animating. Observer on the console that null is printed for "SplashScreen.getSplashScreen().getImageURL()" ,once the new image is set. i,e
This works fine for the first image ,once the image is change it fails.. If you see the same output on the console , then the bug is reproduced.

This problem is reproduce from Mustang b40 onward.