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That is not the same issue, or are you developing that annotation processor?
As you can read in my answer in that topic, there the problem is hen-and-egg.
If you use an annotation processor that is already built and available as artifact, your problem is completely different.

Can you maybe provide an <https://stackoverflow.com/help/mcve|MCVE>?
Normally classes generated by annotation processors properly should also right away be compiled along.
Besdies that this is not a Gradle question at all most probably.
Because if the annotation processor runs, Gradle does the right thing. The rest is up to the compiler and annotation processor.