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Any hint how `val jar by tasks.getting(Jar::class)` behaves if there are multiple Jar tasks in the project? I could not find any docs on that.

Ok, <https://docs.gradle.org/current/kotlin-dsl/gradle/org.gradle.kotlin.dsl/getting.html?query=fun%20%3CT%20:%20Any,%20U%20:%20T%3E%20NamedDomainObjectContainer%3CT%3E.getting(type:%20KClass%3CU%3E):%20PolymorphicDomainObjectContainerGettingDelegateProvider%3CT,%20U%3E|https://docs.gradle.org/current/kotlin-dsl/gradle/org.gradle.kotlin.dsl/getting.html[…]rphicDomainObjectContainerGettingDelegateProvider%3CT,%20U%3E> sounds as if all matching tasks are returned. I was assuming the function to only return one task (provider).

Ah, so the name "jar" is inferred from the variable name due to `by`?

But you should use the named variant to not create the task, named is lazy. 

Like `val jar by tasks.named&lt;Jar&gt;("jar")`?

`val jar = tasks.named&lt;Jar&gt;("jar")`

That requires passing the name, I mean by existing