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A project attached to this comment demonstrates that Gradle does not support (there is a bug) consuming annotation processor output within the same project if it produces .class files. Therefore, it doe snot make sense to create a module level library in the module itself as these symbols are not resolved by the compiler anyway. However, to make them visible to consuming projects it is enough to include them in CLASSES order entries.

We are attaching a non-exported module level library to the main module to represent generated classes. However,

(1) even though these classes are visible to the main module in the IDE they are not visible during compilation, and

(2) while these symbols can be consumed by projects depending on this project when compiling, the IDE does not resolve these symbols because this library is not exported and this is a problem in IDEA as well (see the screenshot)

It is not a problem match the behaviour of Gradle in the IDE, however it is not clear if there is anything that should be fixed in Gradle.

This issue is tracked in https://youtrack.jetbrains.com/issue/KT-33847/Kapt-does-not-included-Filer-generated-class-files-on-compilation-classpath, and it needs to be fixed in the KAPT Gradle plugin.

Once the build is fixed, we can look into the IDE setup.

Bugjuggler: https://youtrack.jetbrains.com/issue/KT-33847

Non-Android project setup is reported to Jetbrains in https://youtrack.jetbrains.com/issue/IDEA-342876/IDE-does-not-resolve-annotation-processor-generated-classes.

I've modified example in #2 a bit to make it Android-specific. The issues are summarized below.

1. :myjavalib is an Android lib with *.java sources only:

   • build/intermediates/javac/debug/classes/com/example/generated/Created.class gets generated by annotation processor
   • Other2.java and FooTest.java reference Created and both :myjavalib:compileDebugUnitTestJavaWithJavac and :myjavalib:compileDebugJavaWithJavac pass
   • IDE does not resolve Created [1]

2. :mylibary is an Android lib with both *.java and *.kt:

   • build/tmp/kapt3/classes/debug/com/example/generated/Created.class gets generated by KAPT
   • Foo.java and Other.kt reference Created and :mylibrary:cDJWJ passes, and IDE resolves symbols
   • ExampleUnitTest.kt and FooTest.java reference Created and :mylibrary:cDUTJWJ passes, but the IDE does NOT resoolve symbols [2]

3. :app is an Android lib that depends on :myjavalib

   • App.java references Created and gradle :app:cDJWJ passes, but the IDE does not resolve symbols. The issue is the same as [1].

4. :app is an Android lib that depends on :mylibrary (please modify app/build.gradle to test this scenario):

   • App.java references Created and gradle :app:cDJWJ passes, but the IDE does not resolve symbols. The issue is the same as [1].

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[1] is impossible to fix as it'd require adding build/intermediates/javac/debug/classes as a library. This would cause duplicate symbol definition for every class (as both its *.java and *.class versions would start showing up).

[2] can be solved by configuring kaptGeneratedClasses library to be exported.

Scenario [2] from #8 is now fixed in ag/Ia7163b3375eda263cb8cb0fc0ce8d6a0cf181bda. It will be released in the next Studio J canary.

Thank you for your patience while our engineering team worked to resolve this issue. A fix for this issue is now available in:

• Android Studio Jellyfish | 2023.3.1 Canary 5
• Android Gradle Plugin 8.4.0-alpha05

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

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