Make it possible to compile with apollo-gradle-plugin and Kotlin 1.5

[martinbonnin]

Bumping KotlinPoet pulled kotlin-stdlib:1.7 as a dependency and the Kotlin 1.5 compiler fails with these warnings:

> Task :compileKotlin FAILED
'compileJava' task (current target is 17) and 'compileKotlin' task (current target is 1.8) jvm target compatibility should be set to the same Java version.
e: Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors
e: /Users/mbonnin/.gradle/caches/modules-2/files-2.1/com.apollographql.apollo3/apollo-gradle-plugin/3.3.2/fcf5eff2ad1c8e0cd36be9e5457cf0257b4c3b01/apollo-gradle-plugin-3.3.2.jar!/META-INF/kotlinpoet.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.7.1, expected version is 1.5.1.
e: /Users/mbonnin/git/test-gradle-7-4/src/main/kotlin/Main.kt: (2, 5): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.7.1, expected version is 1.5.1.
The class is loaded from /Users/mbonnin/.gradle/caches/modules-2/files-2.1/com.apollographql.apollo3/apollo-gradle-plugin/3.3.2/fcf5eff2ad1c8e0cd36be9e5457cf0257b4c3b01/apollo-gradle-plugin-3.3.2.jar!/kotlin/Unit.class

KotlinPoet is not part of the apollo-gradle-plugin public API. It should be safe to remove its .module file (this is where the compiler is looking for things like top-level declarations).

kotlin.Unit is provided by Gradle in the first place so there should be no need to include it in the relocated jar.

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[BoD]

Wow! 👏

[JavierStuart]

Is it planned to include this in the next version? I am having it when trying to upgrade to Kotlin 1.7.0

[BoD]

@JavierStuart Yes this will be included in the next release, which is currently planned to be released early next week.

[martinbonnin]

Is it planned to include this in the next version? I am having it when trying to upgrade to Kotlin 1.7.0

@JavierStuart Double checking we're talking about the same thing: this patch is to make it possible to use Kotlin 1.5 (current Gradle embedded version) with the latest Apollo version. Using Kotlin 1.7.0 shouldn't cause any issue. Can you share your stacktrace?