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The issue is right there in the message, don’t use that reserved name:

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The configuration integrationTestImplementation was created explicitly. This configuration name is reserved for creation by Gradle.

are the set of reserved names documented anywhere? initially it was

integrationImplementation

and then i changed it

The link indeed seems unhelpful. Actually the next section after the linked one seems to apply bether given the title. But even there the text is not too meaningful in that context. You should report that as bug. But besides that, it is simply an order problem. You first have the

configurations *{* integrationTestImplementation.extendsFrom(testImplementation) *}

which also already creates the `integrationTestImplementation`* configuration. Then when you do

sourceSets *{* integrationTest *}

Gradle wants to create the

integrationTestImplementation

configuration, but finds it is already there and complains about exactly that.*

We could definitely improve the documentation here to make the link more helpful. Please open an issue and we will improve the messaging here

will do, yeah, the messaging about it being a reserved name was quite confusing. i kept changing the name of the configuration trying to get it to be something that wasn’t “reserved” 😄 but the ordering makes sense

Thank you for reporting the issue. We are very close to branching for the 8.4 release, so we will likely not be able to get the deprecation revision in by then. However, I’ve targeted this fix for 8.5

sounds good, thanks! end of the day, it’s just a warning, so although rather confusing, it’s not a major issue