Best practices on configure resources

at the moment we have one project configure with

sourceSets {
    resources {
         srcDir generatedResourcesDir
    }
}

taskB {
    doLast {
        copy { stuff into generatedResourcesDir }
    }
}

jar {
    dependsOn taskB
    from generatedResourcesDir
}

when we execute jar task, it would display warning “Encountered Duplicate… DuplicatesStrategy.WARN”

is it the right way to do it? I did try to remove the “from generatedResourcesDir”, but it from times to times it missing generatedResources from taskB, what’s the recommend approach for this?

Cheers,
Tony