kotlinx.serialization
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Kotlin
ClassCastException during serialization
java.lang.reflect.InvocationTargetException
at kotlinx.serialization.internal.PlatformKt.invokeSerializerOnCompanion(Platform.kt:106)
at kotlinx.serialization.internal.PlatformKt.constructSerializerForGivenTypeArgs(Platform.kt:41)
at kotlinx.serialization.internal.PlatformKt.compiledSerializerImpl(Platform.kt:23)
at kotlinx.serialization.SerializersKt__SerializersKt.serializerOrNull(Serializers.kt:178)
at kotlinx.serialization.SerializersKt.serializerOrNull(Unknown Source)
at kotlinx.serialization.SerializersKt__SerializersKt.serializerByKTypeImpl$SerializersKt__SerializersKt(Serializers.kt:83)
at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:59)
at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
at com.epam.ClassCastExceptionTest.test(ClassCastExceptionTest.kt:18)
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:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ExceptionInInitializerError
at com.epam.POJO$Companion.serializer(Model.kt:13)
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 kotlinx.serialization.internal.PlatformKt.invokeSerializerOnCompanion(Platform.kt:101)
... 55 more
Caused by: java.lang.ClassCastException: com.epam.SerializationType cannot be cast to com.epam.CompressType
at com.epam.POJO$$serializer.<clinit>(Model.kt:13)
... 61 more
To Reproduce Mark some field of data class with this annotation and serialize this class
@SerialInfo
@Target(AnnotationTarget.PROPERTY)
annotation class StreamSerializationNew(
val serializationType: SerializationType,
val compressType: CompressType,
val poolRegistration: Array<String> = [],
)
enum class SerializationType {
FST, KRYO
}
enum class CompressType {
NONE, ZSTD
}
I made a project-example which reproduces the given bug just run ClassCastExceptionTest test
https://github.com/Mazel-Tovr/Kotlin-serialization-bugs-sample
Expected behavior Class will be serialized Environment
- Kotlin version: 1.5.30
- Library version: 1.2.2
- Kotlin platforms: JVM
- Gradle version: 6.5.1 or 7.1
The compiler plugin does not respect the annotation field order, and always constructs the generated annotation implementation class with the arguments casted to the field types in alphabetic order.
A workaround is to ensure the annotation fields are listed in alphabetic order, e.g.
@SerialInfo
@Target(AnnotationTarget.PROPERTY)
annotation class StreamSerializationNew(
val compressType: CompressType,
val poolRegistration: Array<String> = [],
val serializationType: SerializationType,
)
