Issue with AOT and Kotlin data class: The following must be non-sealed interfaces

[fab918]

When I add the gradle AOT plugin id("org.graalvm.buildtools.native") I have an error on a simple data class document from org.springframework.data.mongodb.aot.LazyLoadingProxyAotProcessor:

Exception in thread "main" java.lang.IllegalArgumentException: The following must be non-sealed interfaces: [...persistence.entity.Tags]
	at org.springframework.aot.hint.JdkProxyHint$Builder.toTypeReferences(JdkProxyHint.java:159)
	at org.springframework.aot.hint.JdkProxyHint$Builder.proxiedInterfaces(JdkProxyHint.java:129)
	at org.springframework.aot.hint.ProxyHints.lambda$registerJdkProxy$1(ProxyHints.java:78)
	at org.springframework.aot.hint.ProxyHints.registerJdkProxy(ProxyHints.java:50)
	at org.springframework.aot.hint.ProxyHints.registerJdkProxy(ProxyHints.java:77)
	at org.springframework.data.mongodb.aot.LazyLoadingProxyAotProcessor.lambda$registerLazyLoadingProxyIfNeeded$2(LazyLoadingProxyAotProcessor.java:76)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
	at org.springframework.data.mongodb.aot.LazyLoadingProxyAotProcessor.registerLazyLoadingProxyIfNeeded(LazyLoadingProxyAotProcessor.java:55)
	at org.springframework.data.mongodb.aot.MongoManagedTypesBeanRegistrationAotProcessor.contributeType(MongoManagedTypesBeanRegistrationAotProcessor.java:54)
	at org.springframework.data.aot.ManagedTypesRegistrationAotContribution.lambda$applyTo$0(ManagedTypesRegistrationAotContribution.java:97)
	at org.springframework.data.util.TypeCollector.processType(TypeCollector.java:103)
	at org.springframework.data.util.TypeCollector.process(TypeCollector.java:90)
	at org.springframework.data.util.TypeCollector$ReachableTypes.lambda$forEach$0(TypeCollector.java:229)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at org.springframework.data.util.TypeCollector$ReachableTypes.forEach(TypeCollector.java:229)
	at org.springframework.data.aot.ManagedTypesRegistrationAotContribution.applyTo(ManagedTypesRegistrationAotContribution.java:97)
	at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.lambda$generateBeanDefinitionMethod$2(BeanDefinitionMethodGenerator.java:186)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.generateBeanDefinitionMethod(BeanDefinitionMethodGenerator.java:186)
	at org.springframework.beans.factory.aot.BeanDefinitionMethodGenerator.generateBeanDefinitionMethod(BeanDefinitionMethodGenerator.java:109)
	at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.lambda$generateRegisterBeanDefinitionsMethod$2(BeanRegistrationsAotContribution.java:85)
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:721)
	at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.generateRegisterBeanDefinitionsMethod(BeanRegistrationsAotContribution.java:83)
	at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.lambda$applyTo$1(BeanRegistrationsAotContribution.java:67)
	at org.springframework.aot.generate.GeneratedMethod.<init>(GeneratedMethod.java:54)
	at org.springframework.aot.generate.GeneratedMethods.add(GeneratedMethods.java:112)
	at org.springframework.aot.generate.GeneratedMethods.add(GeneratedMethods.java:89)
	at org.springframework.beans.factory.aot.BeanRegistrationsAotContribution.applyTo(BeanRegistrationsAotContribution.java:66)
	at org.springframework.context.aot.BeanFactoryInitializationAotContributions.applyTo(BeanFactoryInitializationAotContributions.java:78)
	at org.springframework.context.aot.ApplicationContextAotGenerator.lambda$processAheadOfTime$0(ApplicationContextAotGenerator.java:58)
	at org.springframework.context.aot.ApplicationContextAotGenerator.withCglibClassHandler(ApplicationContextAotGenerator.java:67)
	at org.springframework.context.aot.ApplicationContextAotGenerator.processAheadOfTime(ApplicationContextAotGenerator.java:53)
	at org.springframework.context.aot.ContextAotProcessor.performAotProcessing(ContextAotProcessor.java:106)
	at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:84)
	at org.springframework.context.aot.ContextAotProcessor.doProcess(ContextAotProcessor.java:49)
	at org.springframework.context.aot.AbstractAotProcessor.process(AbstractAotProcessor.java:82)
	at org.springframework.boot.SpringApplicationAotProcessor.main(SpringApplicationAotProcessor.java:80)

FAILURE: Build failed with an exception.

The Tags class is a simple data class:

@Document
data class Tags(
    @Id var key: String = "",
    var url: String = "",
    var langs: Map<LangEnum, String> = emptyMap()
)

Here is the gradle.kts plugin file, note that to use dataclass with spring data mongodb, you already have to open these classes with allOpen, I guess it is probably related.

plugins {
    id("org.springframework.boot") version "3.0.5"
    id("io.spring.dependency-management") version "1.1.0"
    id("org.jetbrains.kotlin.plugin.allopen") version "1.8.20-RC2"
    id("org.graalvm.buildtools.native") version "0.9.20"
    kotlin("jvm") version "1.7.22"
    kotlin("plugin.spring") version "1.7.22"
}

allOpen {
    annotation("org.springframework.data.mongodb.core.mapping.Document")
}

[christophstrobl]

@fab918 thank you for reporting !
Seems the LazyLoadingProxyAotProcessor has detected a lazy reference pointing to the Tags type that is causing the error.
Could you please take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem and includes also the referencing side of the relationship that is pointing to Tags.

[fab918]

@christophstrobl thanks for your quick answer!
I was able to reproduce the problem in an almost empty project, just the Tags class and the referencing class. (I tried with GraalVm 17.0.4 and 17.0.5 for info).

I noticed a strange thing, if the lazy is an object of type Tags, there is no problem, however if it is a list it is a problem.

@Document
data class Article(
    @Id var id: String = ObjectId.get().toString(),
    // @DBRef(lazy = true) var topic: Tags // This works
    @DBRef(lazy = true) var tags: List<Tags> = emptyList(), // This produce the AOT error
)

aotKotlinBugSealed.zip

[christophstrobl]

Thanks for the reproducer. I need to have a deeper look at this.
Looking at the byte code everything is referring to java.util.List for the tags property. Also constructors, getters/setters and kotlin copy methods show no indication why it should not work.

[fab918]

I am surprised to be the first to encounter the issue, if you need anything don't hesitate to ask!

FYI, I tried to convert both entities and the Application class to Java, and the problem still occurs. However, if the project is a full Java project (I'm attaching it), in this case there is no problem. I hope this will give you a clue about the cause.

demo-java.zip

[christophstrobl]

Thanks for the reproducer! It looks like the type resolution needs a little filtering when collecting the types for the proxy signature.

[christophstrobl]

ok, so there's even more hidden once the AOT compilation step is fixed.
The generated proxy-config is slightly off.

required

[0]: interface java.util.Collection, 
[1]: interface org.springframework.data.mongodb.core.convert.LazyLoadingProxy, 
[2]: interface java.util.List, 
[3]: interface org.springframework.aop.SpringProxy, 
[4]: interface org.springframework.aop.framework.Advised, 
[5]: interface org.springframework.core.DecoratingProxy

generated

[0]: interface org.springframework.data.mongodb.core.convert.LazyLoadingProxy
[1]: interface java.util.List
[2]: interface java.util.Collection 
[3]: interface java.util.Iterable
[4]: interface org.springframework.aop.SpringProxy
[5]: interface org.springframework.aop.framework.Advised
[6]: interface org.springframework.core.DecoratingProxy

[fab918]

Great! Thank you for your work!