"Only subclasses of RealmObject and EmbeddedRealmObject are allowed in the schema" with Kotlin 1.8.0

[neige-i]

Hello, I have a similar problem with the one indicated in this StackOverflow post when minifyEnabled is set to true.

Basically, I can run my app without any problem with Kotlin 1.7.21 and Realm-Kotlin 1.5.2 (and AGP 7.3.1). The problem is when I upgrade to Kotlin version 1.8.0, I get the same error as in the above linked post:

Caused by: java.lang.IllegalArgumentException: Only subclasses of RealmObject and EmbeddedRealmObject are allowed in the schema. Found: my.package.MyRealmDataModel

The problem occurs when building a RealmConfiguration because it calls the io.realm.kotlin.Configuration.SharedBuilder constructor, in which the exception is thrown. The reason the error happens is because clazz.realmObjectCompanionOrNull() returns null, which calls clazz.companionObjectInstance which loops through the class’ nestClasses and finds out the first for which their description.isCompanionObject property returns true. By using the debugger, I managed to reached that code and discovered that the descriptor was a LazyJavaClassDescriptor instance. But, in this ClassDescriptor implementation, the isCompanionObject is always false. I suspect this is due to code generation. Looking at the generated code in my build folder, my realm model is fully converted in java as well as the companion object, but I could be wrong.

I also tried all the rules mentioned in the linked StackOverflow post, to no avail.

[cmelchior]

This can also happen if you didn't apply the Realm Kotlin plugin? If you are doing that, is it something you can reproduce in a sample project we can look at?

[neige-i]

Thank you for your reply. Indeed, the error also happens even if the plugin is not applied. In my case, it is applied at the app module level.

It is reproductible in the little attached sample project:

• 1st commit: simple initialization
• 2nd commit: Realm implementation (the app runs without crashes)
• 3rd commit: Kotlin version upgrade (the app crashes) RealmKotlinTest.zip

Thanks in advance

[rorbech]

Hi @neige-i. This is somehow tied to minifying the app. If I disable minification with minifyEnabled = false then it works. We will have to investigate what has changed around that with Kotlin 1.8.0. Thanks for the report.

[rorbech]

Hi @neige-i. It also somehow seems to be tied to Android Gradle Plugin, since it goes away if bump to Android Gradle Plugin 7.4.0. I haven't identified a specific issue but could be some incompatibility between Android Gradle Plugin and Kotlin 1.8.0 when minifying.

Could you verify in your end that it works by bumping to AGP 7.4.0?

[msa1422]

I am new to the Kotlin Multiplatform and I might be on the wrong issue but I am facing an issue with similar suspects which are Kotlin-1.8.0, AGP-7.4.0, and R8. I will leave it to the experts to decide where the issue lies.

Project compiles with Kotlin-1.8.0, AGP-7.3.1. But when I bump AGP to 7.4.0 a compilation fails while dexing. Here is the error

* What went wrong:
Execution failed for task ':android:app:mergeExtDexDebug'.
> Could not resolve all files for configuration ':android:app:debugRuntimeClasspath'.
   > Failed to transform library-base-release.aar (io.realm.kotlin:library-base-android:1.5.2) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=true, dexing-is-debuggable=true, dexing-min-sdk=24, org.gradle.category=library, org.gradle.status=release, org.gradle.usage=java-runtime, org.jetbrains.kotlin.platform.type=androidJvm}.
      > Execution failed for DexingNoClasspathTransform: /Users/mymac/.gradle/caches/transforms-3/fb6c11c2a3f663e3a6cd4e5e549eca10/transformed/instrumented_library-base-release-runtime.jar.
         > Error while dexing.

If you guys need the full stack trace, please let me know.

[TylerMcCraw]

I'm also seeing this issue with AGP 7.4

[rorbech]

Hi @msa1422. I don't think this is the same issue, so please open a new one with some more details on your project setup, version in play and the full stacktrace. And maybe start by retrying with a clean build.

I am new to the Kotlin Multiplatform and I might be on the wrong issue but I am facing an issue with similar suspects which are Kotlin-1.8.0, AGP-7.4.0, and R8. I will leave it to the experts to decide where the issue lies.

Project compiles with Kotlin-1.8.0, AGP-7.3.1. But when I bump AGP to 7.4.0 a compilation fails while dexing. Here is the error

* What went wrong:
Execution failed for task ':android:app:mergeExtDexDebug'.
> Could not resolve all files for configuration ':android:app:debugRuntimeClasspath'.
   > Failed to transform library-base-release.aar (io.realm.kotlin:library-base-android:1.5.2) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=true, dexing-is-debuggable=true, dexing-min-sdk=24, org.gradle.category=library, org.gradle.status=release, org.gradle.usage=java-runtime, org.jetbrains.kotlin.platform.type=androidJvm}.
      > Execution failed for DexingNoClasspathTransform: /Users/mymac/.gradle/caches/transforms-3/fb6c11c2a3f663e3a6cd4e5e549eca10/transformed/instrumented_library-base-release-runtime.jar.
         > Error while dexing.

If you guys need the full stack trace, please let me know.

[rorbech]

@TylerMcCraw Are you seeing the original issue or the one posted by msa1422? I any case could you provide some more details on your project setup, versions in play, etc.?

[TylerMcCraw]

Both, actually, depending on the versions I use.

With AGP 7.3.0, Realm-Kotlin 1.5.2, and Kotlin 1.8.0, if minifyEnabled is set to true, I receive the

Caused by: java.lang.IllegalArgumentException: Only subclasses of RealmObject and EmbeddedRealmObject are allowed in the schema

error in my log when opening the application.

With AGP 7.4.0, Realm-Kotlin 1.5.2, and Kotlin 1.8.0, I receive the

Failed to transform library-base-release.aar (io.realm.kotlin:library-base-android:1.5.2)

error in my log when building the project.

[rorbech]

@TylerMcCraw Can your create a new issue to track this new error with appropriate information. Ideally a reproduction project, because I cannot replicate your observations with AGP 7.4.0, Realm Kotlin 1.5.2 and Kotlin 1.8.0.

[TylerMcCraw]

Sure thing! I'll add details as soon as I can. Maybe there's something going on with configuration caching or some other gradle property. I'll investigate.

In regards to the original issue around Kotlin 1.8.0 and minify, do you have any ideas yet? I've been trying to define explicit keep rules for all sorts of things, but haven't been able to get past this exception.

[rorbech]

No, unfortunately not. You could try to include the full proguard configuration from our project from https://github.com/realm/realm-kotlin/blob/releases/packages/library-base/proguard-rules-consumer-common.pro, but it could be that the combination of Kotlin 1.8.0/AGP 7.3.1 just somehow not takes it into account. There is probably a bigger chance to workaround it if we can find out what is going wrong when bumping to 7.4.0.

[clementetb]

We have not found yet what is causing this incompatibility with minify, AGP<7.4.0, and Kotlin 1.8.0. Meanwhile, the best solution would be to bump to 7.4.0.

@TylerMcCraw I haven't been able to reproduce the issue you are posting so it might have something to do with your project setup. Would you be able to create a sample project that reproduces the issue?

[TylerMcCraw]

I've just now been able to find a workaround to my issues.

Realm 1.6.0, AGP 7.4.0, Kotlin 1.8.0, targeting Java 11 And the one kicker: I had testCoverageEnabled = true set for all my debug variants on all modules. Removing this got rid of the Failed to transform library-base-release.aar error. And then by using AGP 7.4.0 + Kotlin 1.8.0, I was able to get around the original issue here when minification is enabled (via R8)

I'll try to write up more information tomorrow, if possible. And if I'm certain it's based on this config, I'll create another issue with a sample project. But, I just wanted to quickly post an update so people can check their testCoverageEnabled config

[msa1422]

@TylerMcCraw, your work around works for me too. For Realm 1.5.2, Kotlin 1.8.0 and AGP 7.4.0, I was getting Failed to transform library-base-release.aar I had enableUnitTestCoverage = true and enableAndroidTestCoverage = true set in ApplicationBuildType for debug builds.

After changing enableAndroidTestCoverage = false, the project is now compiling.

I tried bumping Realm to latest 1.6.0, Getting the same Failed to transform library-base-release.aar with enableUnitTestCoverage = true and enableAndroidTestCoverage = true Error goes away with enableAndroidTestCoverage = false

[cmelchior]

Great find @TylerMcCraw. Thank you 🥳

Regarding the original exception I noticed a few things using the project from here https://github.com/realm/realm-kotlin/issues/1212#issuecomment-1384229709

1. It fails with Caused by: java.lang.IllegalArgumentException: Only subclasses of RealmObject and EmbeddedRealmObject are allowed in the schema. Found: fr.neige_i.realmkotlintest.FooRealm. This is due to debug.isMinifyEnabled = true:

        debug {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }

If this is set to false, it compiles correctly. We did fix a few things in this area in 1.5.2, so not 100% sure how this managed to slip through the cracks.

2. If you then bump only the Realm Kotlin plugin to 1.6.0 (and not the library dependency). It will crash with

e: org.jetbrains.kotlin.backend.common.CompilationException: Back-end: Please report this problem https://kotl.in/issue
/Users/cm/Downloads/RealmKotlinTest/app/src/main/java/fr/neige_i/realmkotlintest/FooRealm.kt:-1:-1
Details: Internal error in file lowering: java.lang.IllegalStateException: Cannot find io.realm.kotlin.types.RealmAny on platform JVM (1.8).
        at io.realm.kotlin.compiler.IrUtilsKt.fatalError(IrUtils.kt:575)
 ...
Caused by: java.lang.IllegalStateException: Cannot find io.realm.kotlin.types.RealmAny on platform JVM (1.8).
        ... 63 more

If you set both the plugin and library dependency to 1.6.0 it compiles on my machine at least.

Bottom line, it looks like there are still some issues around obfuscation we need to look at.

[clementetb]

We have created a new issue to track this enablAndroidTestCoverage issue.

[cmelchior]

Closing this issue. The fix for this is to move to AGP 7.4 and we are tracking Realm Kotlin working with testCoverage enabled in #1243.