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I believe this might be deprecated but still works
```android {
    applicationVariants.all { // or as appropriate
        registerJavaGeneratingTask(task, outputDir) // not Provider, unfortunately```

yeah, but, `applicationVariants` is only accessible from `AppExtension` and not from `BaseExtension` and, it only adds to the main source set of a variant, but I need to add my generated sources to all source sets

for the first issue, you could do a hack like
```android {
    val variants = when (this) {
        is AppExtension -&gt; applicationVariants
        is LibraryExtension -&gt; libraryVariants
        else -&gt; throw GradleException("unsupported")
    }
```
for the second, how much does it matter? if it's in the main source set, it's visible in the test source sets too

if that doesn't work for you, then maybe add the task to prebuild dependencies, which isn't great but I don't think there's another API to handle this cleanly

Could your issue be related to:
<https://issuetracker.google.com/issues/232420188#comment19>
?

<@U019L3NM4PK> yeah, that could work if the goal was to only make these sources *visible* to test/variant sources, but the problem that I’m trying to solve here is to trigger java compilation within these source sets when they don’t have any java sources