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Gradle itself provides SLF4J, so you shouldn't have your own dependency on it as it won't be used anyway. And yes, that means SLF4J 1.x for now.

ok I see. The problem is that I am relying on a dependency myself which uses SLF4J 2.x methods already 😞 I am getting

java.lang.NoSuchMethodError

at runtime

Depending on what you need to do, try to externalize it in a worker so you can have classloader isolation (and resolve those dependencies by creating a configuration in the project and declaring those dependencies there at runtime, rather than having them as dependencies of your plugin; like how Gradle's own Checkstyle, PMD, etc. work for instance)

thanks @Thomas Broyer! That is very interesting, I will think about using this approach

Just to be cristal clear, by "a worker" I mean the Worker API: https://docs.gradle.org/current/userguide/custom_tasks.html#worker_api