Could not initialize class aws.smithy.kotlin.runtime.time.Instant

[madisp]

Describe the bug

Started hitting this at runtime when upgrading aws.sdk.kotlin:sqs-jvm from 1.5.63 to 1.5.64.

Trace:

java.lang.NoClassDefFoundError: Could not initialize class aws.smithy.kotlin.runtime.time.Instant
	at aws.smithy.kotlin.runtime.awsprotocol.ClockSkewInterceptor.modifyBeforeSigning(ClockSkewInterceptor.kt:77)
	at aws.smithy.kotlin.runtime.http.interceptors.InterceptorExecutor.modifyBeforeSigning(InterceptorExecutor.kt:209)
	at aws.smithy.kotlin.runtime.http.operation.AuthHandler.call(SdkOperationExecution.kt:314)
	at aws.smithy.kotlin.runtime.http.operation.AuthHandler.call(SdkOperationExecution.kt:268)
	at aws.sdk.kotlin.runtime.http.middleware.AwsRetryHeaderMiddleware.handle(AwsRetryHeaderMiddleware.kt:39)
	at aws.sdk.kotlin.runtime.http.middleware.AwsRetryHeaderMiddleware.handle(AwsRetryHeaderMiddleware.kt:26)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.io.middleware.Phase.handle(Phase.kt:68)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware.tryAttempt-BWLJW6A(RetryMiddleware.kt:88)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware.access$tryAttempt-BWLJW6A(RetryMiddleware.kt:34)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware$handle$result$outcome$1$invokeSuspend$$inlined$withSpan$default$1.invokeSuspend(CoroutineContextTraceExt.kt:142)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware$handle$result$outcome$1$invokeSuspend$$inlined$withSpan$default$1.invoke(CoroutineContextTraceExt.kt)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware$handle$result$outcome$1$invokeSuspend$$inlined$withSpan$default$1.invoke(CoroutineContextTraceExt.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndspatched(Undispatched.kt:66)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:43)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
	at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware$handle$result$outcome$1.invokeSuspend(RetryMiddleware.kt:146)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware$handle$result$outcome$1.invoke(RetryMiddleware.kt)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware$handle$result$outcome$1.invoke(RetryMiddleware.kt)
	at aws.smithy.kotlin.runtime.retries.StandardRetryStrategy.doTryLoop(StandardRetryStrategy.kt:64)
	at aws.smithy.kotlin.runtime.retries.StandardRetryStrategy.retry$suspendImpl(StandardRetryStrategy.kt:44)
	at aws.smithy.kotlin.runtime.retries.StandardRetryStrategy.retry(StandardRetryStrategy.kt)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware.handle(RetryMiddleware.kt:49)
	at aws.smithy.kotlin.runtime.http.middleware.RetryMiddleware.handle(RetryMiddleware.kt:34)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.http.operation.MutateHandler.call(SdkOperationExecution.kt:265)
	at aws.smithy.kotlin.runtime.http.operation.MutateHandler.call(SdkOperationExecution.kt:262)
	at aws.smithy.kotlin.runtime.io.middleware.ModifyRequestMiddleware.handle(ModifyRequest.kt:26)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.io.middleware.ModifyRequestMiddleware.handle(ModifyRequest.kt:26)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.io.middleware.ModifyRequestMiddleware.handle(ModifyRequest.kt:26)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.io.middleware.ModifyRequestMiddleware.handle(ModifyRequest.kt:26)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.io.middleware.Phase.handle(Phase.kt:68)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.http.operation.SerializeHandler.call(SdkOperationExecution.kt:258)
	at aws.smithy.kotlin.runtime.http.operation.SerializeHandler.call(SdkOperationExecution.kt:237)
	at aws.smithy.kotlin.runtime.http.operation.InitializeHandler.call(SdkOperationExecution.kt:234)
	at aws.smithy.kotlin.runtime.io.middleware.Phase.handle(Phase.kt:64)
	at aws.smithy.kotlin.runtime.io.middleware.DecoratedHandler.call(Middleware.kt:47)
	at aws.smithy.kotlin.runtime.http.operation.OperationHandler.call(SdkOperationExecution.kt:213)
	at aws.smithy.kotlin.runtime.http.operation.OperationHandler.call(SdkOperationExecution.kt:203)
	at aws.smithy.kotlin.runtime.http.operation.SdkHttpOperationKt$execute$$inlined$withSpan$1.invokeSuspend(CoroutineContextTraceExt.kt:126)
	at aws.smithy.kotlin.runtime.http.operation.SdkHttpOperationKt$execute$$inlined$withSpan$1.invoke(CoroutineContextTraceExt.kt)
	at aws.smithy.kotlin.runtime.http.operation.SdkHttpOperationKt$execute$$inlined$withSpan$1.invoke(CoroutineContextTraceExt.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndspatched(Undispatched.kt:66)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:43)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
	at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
	at aws.smithy.kotlin.runtime.http.operation.SdkHttpOperationKt.execute(SdkHttpOperation.kt:189)
	at aws.smithy.kotlin.runtime.http.operation.SdkHttpOperationKt.roundTrip(SdkHttpOperation.kt:96)
	at aws.sdk.kotlin.services.sqs.DefaultSqsClient.receiveMessage(DefaultSqsClient.kt:822)
	at warp.tasks.SqsTaskListener$init$2$messages$1.invokeSuspend(SqsTaskListener.kt:49)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)
Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.NoClassDefFoundError: kotlinx/datetime/Instant [in thread "DefaultDispatcher-worker-2"]
	at aws.smithy.kotlin.runtime.time.Instant.<clinit>(InstantJVM.kt:140)
	... 65 common frames omitted

Regression Issue

• Select this option if this issue appears to be a regression.

Expected behavior

I can invoke SqsClient.receiveMessage without runtime class init errors.

Current behavior

I cannot invoke SqsClient.receiveMessage without runtime class init errors.

Steps to Reproduce

Looks like shading gone wrong and might be related to Instant moving from kotlinx-datetime to kotlin-stdlib?

Library versions used:

• Kotlin 2.3.0-Beta1
• org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2
• org.jetbrains.kotlinx:kotlinx-datetime:0.7.1
• aws.sdk.kotlin:sqs-jvm:1.5.64

Possible Solution

No response

Context

No response

Smithy-Kotlin version

v1.5.15

Platform (JVM/JS/Native)

JVM

Operating system and version

MacOS Tahoe 26.0.1 / Ubuntu 24.04 LTS

[madisp]

Actually not shading, but just using the removed kotlinx.datetime.Instant:

smithy-kotlin/runtime/runtime-core/jvm/src/aws/smithy/kotlin/runtime/time/InstantJVM.kt

Line 28 in 6ca2837

import kotlinx.datetime.Instant as KtInstant

[lauzadis]

Thanks for reporting, I opened a PR which should address this #1446

[lauzadis]

I realized kotlin.time.Instant requires an opt-in on kotlin.time.ExperimentalTime, so we won't be able to ship this fix until Kotlin 2.3.0 where it's stable. In the meantime, consider using kotlinx-datetime version 0.7.1-0.6.x-compat which would fix your NoClassDefFoundError