@ancient-stone-50795: I’ve been working on this patch: https://github.com/pantsbuild/pants/issues/2049, and looking into moving the check from JvmBinary to JvmBinaryTask, or actually into BinaryCreate in the execute method, as you suggested. Unfortunately the error occurs long before JvmBinaryTask and BinaryCreate get looked at. Anything asking the target for its finger print after the target has been created will trigger the validation. This can happen in any task that happens to fingerprint the entire graph.