> 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..

Prasanta Sadhukhan has updated the pull request incrementally with three 
additional commits since the last revision:

 - Test update
 - Test update
 - Test update

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25767/files
  - new: https://git.openjdk.org/jdk/pull/25767/files/765e0dfc..0b8b0425

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25767&range=16
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25767&range=15-16

  Stats: 354 lines in 2 files changed: 132 ins; 222 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25767.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25767/head:pull/25767

PR: https://git.openjdk.org/jdk/pull/25767

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