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Image.getProperty() and JPEG files

Can anyone tell me how one creates or modifies a JPEG so that Image.getProperty() will actually find properties which can be gotten?

I've tried adding a comment to a JPEG via GraphicConverter. I can see the comment in a hex dump of the file, but Java seems blissfully unaware of the comment being there. Just in case "comment" wasn't the right property name to use, I looked at my Image object in a debugger and I can see a member variable named "properties" -- it's nothing but an empty Hashtable.

I've used a MediaTracker to make sure my image is fully loaded -- and since at the same point in the code I can paint the image into a BufferedImage, I have confirmation the image is fully loaded and rendered. The image byte data clearly contains my comment text, so I know I'm loading the correct commented image.

The Java API docs talk about using a property named "comment" "to store an optional comment which can be presented to the application as a description of the image, its source, or its author". The Swing ImageIcon class tries to use the "comment" property to get a description of an ImageIcon. The idea of using one of these "comment" properties seems to be out there -- but a lot of Googling has failed to turn up any mention of how the #$&*@!!! (yeah, I'm getting a bit frustrated at this point) you're supposed to put a comment into an image in the first place.
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