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Fwiw, I do put the version of the Java toolchain (and versions of tools used by plugins, e.g. google-java-format and ktlint, used throughspotless) in my version catalog.

I have this kind of code in my convention plugin:
```java {
    toolchain {
        languageVersion.set(JavaLanguageVersion.of(project.the&lt;VersionCatalogsExtension&gt;().named("libs").findVersion("javaToolchain").orElseThrow().requiredVersion))
    }
}```


Ok, what actually bother me is the `.toInt()` but :shrug:

Well, `JavaLanguageVersion.of()` is not much different from `.toInt()` as some parsing is involved anyway, and I need a string, not any "rich version" (see `.requiredVersion`, it would ignore any other property of rich versions here).
(I do believe I've used `.toInt()` in the past, or maybe just in another project, to set `.release`, rather than using a toolchain)