Fix automatic module name of the change agent

[triceo]

class is not allowed in an automatic module name. klass will work.

Fixes: #29719
Fixes: #28919

[geoand]

LGTM, thanks!

[triceo]

@geoand Any chance we could backport to 2.16?
(Asking as this is blocking me from bumping Javadoc plugin version in OptaPlanner, and I want to do that while still being compatible with 2.x.)

[geoand]

I kinda doubt we'll do that, but up to @gsmet

[quarkus-bot]

Failing Jobs - Building fe95e5f

Status	Name	Step	Failures	Logs	Raw logs
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[gsmet]

If you create a pull request with a relocation in the relocations/ directory, I could be convinced to backport it.

[geoand]

Didn't think about that, it's a good idea

[gsmet]

Hmmm. In fact I would prefer we revert this change entirely. We should be able to just override the automatic module name instead of changing the artifact name.
See https://github.com/hibernate/hibernate-validator/blob/main/engine/pom.xml#L223-L244 for an example.

@triceo is there a reason why you haven't chosen this approach?

[triceo]

@gsmet The reason was that I do not understand the Quarkus build well enough to be able to say where is the right place to set the automatic module name.

• I looked through the codebase and it is never overriden anywhere, so I couldn't take a hint.
• I could simply configure the JAR plugin to do it, but I don't know if it could interfere with some sort of productization settings somewhere.

If configuring the JAR plugin is the recommended way to go, I can do it.