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Yes. Checkstyle depends on Guava, but also transitively on plexus-container-default which depends on the ancient Google Collections. Use a capability resolution rule to select Guava (and report the issue to Checkstyle; unless they already have an exclusion in their POM that Gradle does not respect, in that case file a bug against Gradle)

should I select the latest? or you don't know

you should prefer Google Guava over the Very Ancient Google Collections - and, as noted above, vanquish that legacy library from the dependency graph.

I'm guessing I can't use static accessors

Just because I stumbled upon it, you should change

dependsOn(subprojects.map { it.tasks.dependencies })

to

dependsOn(subprojects.map { "${it.path}:dependencies" })

to not reach into those other projects model.

configurations.checkstyle {
  resolutionStrategy.capabilitiesResolution.withCapability("com.google.guava:guava") {
    selectHighestVersion()
  }
}

dependencies {
  checkstyle(libs.checkstyle)
}

didn't work 😕

it isn’t the highest version - you want to match on the capability

com.google.collections:google-collections

(from the build scan) and select the Guava module.

configurations.checkstyle {
  resolutionStrategy.capabilitiesResolution.withCapability("com.google.collections:google-collections") {
    select("com.google.guava:guava")
  }
}

> Could not resolve all dependencies for configuration ':app:checkstyle'.
   > Capability resolution rule failed with an error
      > Invalid module component notation: com.google.guava:guava : must be a valid 3 part identifier, eg.: org.gradle:gradle:1.0

so I have to provide the version? I can't say use the version that's being asked for?

See the sample code for log4j-over-slf4j in the docs (link above) and adapt it for Guava and Google Collections.

Were the versions increasing across the rename? Then just

selectHighestVersion()

should be fine. It means select the higher version of the two conflicting ones.

ok, I decided to test it, this exists purely because gradle decided to ignore the version of checkstyle I put in my libs.versions.toml and upgrade me to version 10

Where do you tell it to use 8?

dependencies {
  checkstyle(libs.checkstyle)
}

checkstyle = "com.puppycrawl.tools:checkstyle:[8,)"

oh, that's 8 or later 😕

Yes

sigh got it

Besides that, from a quick look you only configure the checkstyle version on the root project, but where it complains is on

app

seems to work on sub projects...

Well, you can always just use the respective

dependencies

task for the

checkstyle

configuration or a build

--scan

to see which will be used.