Exception when starting LocalEvaluationClient when there is a Flag segment that uses User ID or Device ID

[mpomorski]

Amplitude UI allows you to configure different segments of targeted users.

In a segment you can filter by either User ID or Device ID.

When there is a locally evaluated flag in a project that uses segmentation filter like the above it throws an unhandled exception when performing

    LocalEvaluationClient localEvaluationClient = Experiment.initializeLocal(apiKey);
    localEvaluationClient.start();

It makes the client totally unusable.

Stack trace:

Exception in thread "OkHttp Dispatcher" java.lang.NoClassDefFoundError: kotlinx/serialization/internal/EnumsKt
	at com.amplitude.experiment.evaluation.serialization.SerialOperator$Companion$$cachedSerializer$delegate$1.invoke(Serialization.kt:138)
	at com.amplitude.experiment.evaluation.serialization.SerialOperator$Companion$$cachedSerializer$delegate$1.invoke(Serialization.kt:138)
	at kotlin.SafePublicationLazyImpl.getValue(LazyJVM.kt:107)
	at com.amplitude.experiment.evaluation.serialization.SerialOperator$Companion.serializer(Serialization.kt:138)
	at com.amplitude.experiment.evaluation.serialization.SerialUserPropertyFilter$$serializer.childSerializers(Serialization.kt:163)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor$childSerializers$2.invoke(PluginGeneratedSerialDescriptor.kt:36)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor$childSerializers$2.invoke(PluginGeneratedSerialDescriptor.kt:36)
	at kotlin.SafePublicationLazyImpl.getValue(LazyJVM.kt:107)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor.getChildSerializers(PluginGeneratedSerialDescriptor.kt:36)
	at kotlinx.serialization.internal.PluginGeneratedSerialDescriptor.getElementDescriptor(PluginGeneratedSerialDescriptor.kt:76)
	at kotlinx.serialization.descriptors.SerialDescriptorKt$elementDescriptors$1$1.next(SerialDescriptor.kt:284)
	at kotlinx.serialization.descriptors.SerialDescriptorKt$elementDescriptors$1$1.next(SerialDescriptor.kt:279)
	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:35)
	at kotlinx.serialization.json.internal.DescriptorSchemaCache.getOrPut(SchemaCache.kt:27)
	at kotlinx.serialization.json.internal.JsonNamesMapKt.getJsonNameIndex(JsonNamesMap.kt:52)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeObjectIndex(StreamingJsonDecoder.kt:139)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeElementIndex(StreamingJsonDecoder.kt:92)
	at com.amplitude.experiment.evaluation.serialization.SerialUserPropertyFilter$$serializer.deserialize(Serialization.kt:163)
	at com.amplitude.experiment.evaluation.serialization.SerialUserPropertyFilter$$serializer.deserialize(Serialization.kt:163)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
	at kotlinx.serialization.encoding.CompositeDecoder$DefaultImpls.decodeSerializableElement$default(Decoding.kt:535)
	at kotlinx.serialization.internal.ListLikeSerializer.readElement(CollectionSerializers.kt:80)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.readElement$default(CollectionSerializers.kt:51)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.merge(CollectionSerializers.kt:36)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.deserialize(CollectionSerializers.kt:43)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
	at com.amplitude.experiment.evaluation.serialization.SerialSegmentTargetingConfig$$serializer.deserialize(Serialization.kt:116)
	at com.amplitude.experiment.evaluation.serialization.SerialSegmentTargetingConfig$$serializer.deserialize(Serialization.kt:116)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
	at kotlinx.serialization.encoding.CompositeDecoder$DefaultImpls.decodeSerializableElement$default(Decoding.kt:535)
	at kotlinx.serialization.internal.ListLikeSerializer.readElement(CollectionSerializers.kt:80)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.readElement$default(CollectionSerializers.kt:51)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.merge(CollectionSerializers.kt:36)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.deserialize(CollectionSerializers.kt:43)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeNullableSerializableElement(AbstractDecoder.kt:79)
	at com.amplitude.experiment.evaluation.serialization.SerialFlagConfig$$serializer.deserialize(Serialization.kt:36)
	at com.amplitude.experiment.evaluation.serialization.SerialFlagConfig$$serializer.deserialize(Serialization.kt:36)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
	at kotlinx.serialization.encoding.CompositeDecoder$DefaultImpls.decodeSerializableElement$default(Decoding.kt:535)
	at kotlinx.serialization.internal.ListLikeSerializer.readElement(CollectionSerializers.kt:80)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.readElement$default(CollectionSerializers.kt:51)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.merge(CollectionSerializers.kt:36)
	at kotlinx.serialization.internal.AbstractCollectionSerializer.deserialize(CollectionSerializers.kt:43)
	at kotlinx.serialization.json.internal.PolymorphicKt.decodeSerializableValuePolymorphic(Polymorphic.kt:59)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:36)
	at kotlinx.serialization.json.Json.decodeFromString(Json.kt:100)
	at com.amplitude.experiment.flag.FlagConfigApiImpl$getFlagConfigs$$inlined$request$1.onResponse(Request.kt:45)
	at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.ClassNotFoundException: kotlinx.serialization.internal.EnumsKt
	at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	... 73 more

[tyiuhc]

@mpomorski Many thanks for raising this issue, this has been addressed in v1.2.3. Please let us know if you continue to encounter this error.

[mpomorski]

Nice one, thanks!
I confirm I can't reproduce the issue with the latest version of the lib.
The desired segmentation works as expected.