Hm, ok, this is unlucky and might be worth an issue report. The

compileJava

task has to execute before the

sourcesJar

task to trigger the error (of course without having an ordering constraint or the error would not happen). If you run

gw :gradle-plugin:compileJava :gradle-plugin:sourcesJar

with the

compileKotlin

task up-to-date, the

compileJava

should be done before

sourcesJar

and then the error also locally reproduces properly. But if the

compileKotlin

task is run, it probably uses the worker API and thus the

sourcesJar

task can run in parallel and finish before the

compileJava

task is executed which hides the error. This is actually a bit pointless, because if the

compileJava

task runs second it would exactly be the main problem caused by the overlapping outputs that should be prevented with this check.

But your fix should be fine. Before you had the whole

build/generated/

as output directory of

createVersionsKtFile

which causes overlapping output with

compileJava

which has a subdirectory of that for annotation processor generated sources. By giving the

createVersionsKtFile

a dedicated output directory that does not overlap with other tasks, you did exactly the right thing to fix the problem.

Please also post the link here after posting for followup

With configuration cache enabled it is even worse, as there all tasks can run in parallel. With that I was not yet able to reproduce the error at all