Hi Gary,

On 5.05.2026 13:14, Gary Gregory wrote:
> Thank you for the update Piotr. So don't you need to enable the
> "docker" profile? I don't see "-P docker" above.

You can enable the profile explicitly, but it is activated by default
when `CI=true`. Admittedly, picking a less implicit trigger would have
been a better choice.

On 5.05.2026 13:26, Gary Gregory wrote:
>   Caused by: [CIRCULAR REFERENCE: foo.TestFriendlyException: r_c
> [localized]]

You've hit a JDK 8 bug:

https://bugs.openjdk.org/browse/JDK-8252489

The format that `Throwable#printStackTrace()` produces for circular
references changed in *8u272*: both the `Caused by:` / `Suppressed:`
caption and the space after `[CIRCULAR REFERENCE:` were added by that fix.

Our test compares Log4j's output to the live JVM's `printStackTrace()`
output, so it only passes on 8u272 or newer. My local JDK is 1.8.0_482,
which is why it passes for me; you must be running an older 8u build.

Piotr

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