RFR: 8360160: ubuntu-22-04 machine is failing client tests [v2]

[Alexander Zvegintsev]

On Wed, 3 Dec 2025 21:45:56 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> There was a prior PR that attempted to fix this issue, but it was found that [JDK-8280987](https://bugs.openjdk.org/browse/JDK-8280987) was the more reasonable cause. The issue was caused by Ubuntu instances having a large amount of graphics configurations, hence a large amount of concurrent frames being open and tested on at a time. As such, the newly suggested fix was to instead break apart the test into batches.
>> 
>> This change creates and disposes of the test frames in batches of 20, up to the number of GC's identified. The original problem was recreated when testing on Ubuntu 24.04, and I have re-tested this with the updated test on the same device, and it passes. When debugging, 140 GC's were identified and all 140 frames were created and disposed of. Also tested this on macOS 15 and the test also passes. CI looks good as well.
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix curly brace issue when moving code

test/jdk/java/awt/Frame/FrameVisualTest.java line 95:

> 93:                     });
> 94:                     Rectangle rect = new Rectangle(p, d);
> 95:                     BufferedImage img = robot.createScreenCapture(rect);

https://github.com/openjdk/jdk/pull/26871#discussion_r2298835087 is still valid for the updated test.

On Ubuntu, a batch of windows opens in one place, so only the top window in the stack is checked.

<img width="157" height="144" alt="Image" src="https://github.com/user-attachments/assets/769e72e3-70f5-4cd3-970d-1385724b6b92" />

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PR Review Comment: https://git.openjdk.org/jdk/pull/28646#discussion_r2598129828