decode json to entity failure by @Serializer

[xiazunyang]

Describe the bug
A class generated by Sqldelight:

public data class Department(
  public val id: String,
  public val name: String,
  public val code: String,
  public val parentId: String?,
)

To interface with the WEB API, I created the DepartmentSerializer class and marked it with the @Serializer annotation:

@Serializer(forClass = Department::class)
object DepartmentSerializer

An error occurred while deserializing:

java.lang.ArrayIndexOutOfBoundsException: 0
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor.getElementDescriptor(PluginGeneratedSerialDescriptor.kt:135)
	at kotlinx.serialization.descriptors.SerialDescriptorKt$elementDescriptors$1$1.next(SerialDescriptor.kt:298)
	at kotlinx.serialization.descriptors.SerialDescriptorKt$elementDescriptors$1$1.next(SerialDescriptor.kt:293)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptorKt.hashCodeImpl(PluginGeneratedSerialDescriptor.kt:137)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor$_hashCode$2.invoke(PluginGeneratedSerialDescriptor.kt:44)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor$_hashCode$2.invoke(PluginGeneratedSerialDescriptor.kt:44)
	at kotlin.SafePublicationLazyImpl.getValue(LazyJVM.kt:107)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor.get_hashCode(PluginGeneratedSerialDescriptor.kt:44)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor.hashCode(PluginGeneratedSerialDescriptor.kt:97)
	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
	at kotlinx.serialization.json.internal.DescriptorSchemaCache.get(SchemaCache.kt:37)
	at kotlinx.serialization.json.internal.DescriptorSchemaCache.getOrPut(SchemaCache.kt:29)
	at kotlinx.serialization.json.internal.JsonNamesMapKt.deserializationNamesMap(JsonNamesMap.kt:54)
	at kotlinx.serialization.json.internal.JsonNamesMapKt.getJsonNameIndexSlowPath(JsonNamesMap.kt:73)
	at kotlinx.serialization.json.internal.JsonNamesMapKt.getJsonNameIndex(JsonNamesMap.kt:97)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeObjectIndex(StreamingJsonDecoder.kt:226)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeElementIndex(StreamingJsonDecoder.kt:175)
	at com.staringsoft.mobileapp.abp.department.data.DepartmentSerializer.deserialize(DepartmentSerializer.kt:13)
	at com.staringsoft.mobileapp.abp.department.data.DepartmentSerializer.deserialize(DepartmentSerializer.kt:13)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:70)
	at kotlinx.serialization.json.Json.decodeFromString(Json.kt:107)
	at com.staringsoft.mobileapp.common_abp.CommonGreetingTest.testExample(commonTest.kt:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:108)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:40)
	at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:60)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:52)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
	at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

To Reproduce

    val json = Json {
      ignoreUnknownKeys = true
      serializersModule = SerializersModule {
        contextual(DepartmentSerializer)
      }
    }

    val jsonStr = """{"parentId":"1","code":"00001","displayName":"Jetbrains","id":"3"}"""
    val department = json.decodeFromString<Department>(jsonStr)
    println(department)

Expected behavior
print department info.

Environment

• Kotlin version: 1.9.0
• Library version: 1.6.0
• Kotlin platforms: jvm/native
• Gradle version: 8.2.1
• IDE version (if bug is related to the IDE) Android Studio Giraffe | 2022.3.1 Patch `
• Other relevant context [e.g. OS version, JRE version, ... ] Windows 11, JDK17

[xiazunyang]

It worked fine when I did not use the @serializer annotation and manually wrote the deserialization code.

object DepartmentSerializer: KSerializer<Department> {

  override val descriptor: SerialDescriptor = buildClassSerialDescriptor("com.staringsoft.mobileapp.abp.department.data.Department") {
    element<String>("id")
    element<String>("displayName")
    element<String>("code")
    element<String?>("parentId")
  }

  override fun deserialize(decoder: Decoder): Department {
    lateinit var id: String
    lateinit var name: String
    lateinit var code: String
    var parentId: String? = null

    decoder.decodeStructure(descriptor) {
      do {
        val index = decodeElementIndex(descriptor)
        when (index) {
          0 -> id = decodeStringElement(descriptor, index)
          1 -> name = decodeStringElement(descriptor, index)
          2 -> code = decodeStringElement(descriptor, index)
          3 -> parentId = decodeNullableSerializableElement(descriptor, index, String.serializer())
        }
      } while (index > -1)
    }

    return Department(id = id, name = name, code = code, parentId = parentId)
  }

  override fun serialize(encoder: Encoder, value: Department) {
    TODO("Not yet implemented")
  }
}

[sandwwraith]

Yes, this looks like a bug in an externally generated descriptor. Likely duplicate of #840