RFR: 8159055: ImageIcon.setImage can't handle null parameter

[Abhishek Kumar]

On Thu, 12 Jun 2025 03:23:30 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> When trying to call 'icon.setImage(null);' where 'icon' is an instance of ImageIcon, a null pointer exception is thrown at runtime.
> The code tried to get the `id` for that image and instantiates `MediaTracker` to associate the null image to that `id` and checks the status of loading this null image, removes the null image from the tracker and then tries to get the image width where it throws NPE as image is null.
> 
> It's better to not go through all MediaTracker usage and bail out initially itself for null image..

Does it require to update the doc as well to explicitly mention about NULL parameter ?
Otherwise fix looks ok to me.

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PR Comment: https://git.openjdk.org/jdk/pull/25767#issuecomment-2965225362