Adding modules from a child layer

[Alan Bateman]

On 14/03/2025 12:10, Simone Bordet wrote:
> :
> With some archeology, I found:
> https://urldefense.com/v3/__https://bugs.eclipse.org/bugs/show_bug.cgi?id=347110__;!!ACWV5N9M2RV99hQ!IW-lZcO8m0GajZDPc4BK-QlJTTyR0a8NZNZT4IFVuTZWTd4j0sJZ0MThsyXFb3W1ez6iScbbkrxHxFmx3lbHGnyQ$   :)
>
> TLDR: Spring had (has?) a mechanism to instrument loaded class, I
> assume for dependency injection.
> The Spring agent requires custom class loaders to have an
> `addTransformer(ClassFileTransformer)` method, hence the dependency of
> Jetty's WebAppClassLoader to java.instrument.
>
Okay, so I think this more about ClassFileTransformer being a generally 
useful interface and WebAppClassLoader uses it for users that wants to 
instrument at ClassLoader load class time. So Java agents aren't in the 
picture, it's just one of the interfaces from j.l.instrument is being 
used and so this module needs to be the boot layer.

-Alan
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