Can't use nullable types in Entities with Kotlin KSP

[CorayThan]

I was hoping you could help me determine if this is the correct repository to report this error in. Given the stacktrace, I'm not sure if this is a problem with the Kotlin functionality you've recently added, or with kotlinpoet, or KSP itself.

Describe the bug
Using nullable values with Kotlin KSP causes an error. when trying to perform a build.

To Reproduce
I created a miniature repository that recreates the issue fully. Just run a gradle build in this project to fully recreate the problem.

kspnullerror repo

But all it takes is using KSP along with this code:

@Entity
class TestEntity(

    // Nullable Int causes failure
    val amount: Int?,

// Rest of the Entity

Expected behavior
I expect a gradle build to work.

Additional context
Full stacktrace:

[ksp] java.lang.IllegalStateException: KSType 'Comparable<Int>' has type arguments, which are not supported for ClassName conversion. Use KSType.toTypeName().
	at com.squareup.kotlinpoet.ksp.KsTypesKt.toClassName(KsTypes.kt:44)
	at com.querydsl.ksp.codegen.TypeExtractor.collectionType(TypeExtractor.kt:64)
	at com.querydsl.ksp.codegen.TypeExtractor.extract(TypeExtractor.kt:25)
	at com.querydsl.ksp.codegen.QueryModelExtractor.extractProperties$lambda$7(QueryModelExtractor.kt:79)
	at kotlin.sequences.TransformingSequence$iterator$1.next(Sequences.kt:210)
	at kotlin.sequences.SequencesKt___SequencesKt.toList(_Sequences.kt:820)
	at com.querydsl.ksp.codegen.QueryModelExtractor.extractProperties(QueryModelExtractor.kt:82)
	at com.querydsl.ksp.codegen.QueryModelExtractor.processProperties(QueryModelExtractor.kt:65)
	at com.querydsl.ksp.codegen.QueryModelExtractor.process(QueryModelExtractor.kt:34)
	at com.querydsl.ksp.codegen.QueryDslProcessor.finish(QueryDslProcessor.kt:29)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$12$1.invoke(KotlinSymbolProcessingExtension.kt:359)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$12$1.invoke(KotlinSymbolProcessingExtension.kt:358)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.handleException(KotlinSymbolProcessingExtension.kt:430)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.doAnalysis(KotlinSymbolProcessingExtension.kt:358)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:112)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:75)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze$lambda$9(KotlinToJVMBytecodeCompiler.kt:356)
	at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:112)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:347)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.runFrontendAndGenerateIrUsingClassicFrontend(KotlinToJVMBytecodeCompiler.kt:177)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:102)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:169)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:102)
	at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.kt:316)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1554)

[github-actions]

This issue has been automatically closed because the author did not indicate they are willing to put in the effort needed to resolve it.