Cannot call Kotlin suspend function in `@Around` advice after Spring Framework 6.1

[T45K]

Affects: <Spring Framework version>

• org.springframework.boot: 3.2.0
• org.springframework: 6.1.1

---

We used this workaround to execute suspend function in advice.
But, after updating Spring Boot to 3.2.0, ClassCastException occurs.

stack trace

Details

java.lang.ClassCastException: class reactor.core.publisher.MonoOnErrorResume cannot be cast to class java.lang.CharSequence (reactor.core.publisher.MonoOnErrorResume is in unnamed module of loader 'app'; java.lang.CharSequence is in module java.base of loader 'bootstrap')
	at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:106) ~[reactor-core-3.6.0.jar:3.6.0]
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
	*__checkpoint ⇢ Handler io.github.t45k.r2dbc_aop_trial.R2dbcAopTrialApplication#aop(Continuation) [DispatcherHandler]
	*__checkpoint ⇢ org.springframework.security.web.server.authorization.AuthorizationWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.authorization.ExceptionTranslationWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.authentication.logout.LogoutWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.savedrequest.ServerRequestCacheWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.context.SecurityContextServerWebExchangeWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.context.ReactorContextWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.csrf.CsrfWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.header.HttpHeaderWriterWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.config.web.server.ServerHttpSecurity$ServerWebExchangeReactorContextWebFilter [DefaultWebFilterChain]
	*__checkpoint ⇢ org.springframework.security.web.server.WebFilterChainProxy [DefaultWebFilterChain]
	*__checkpoint ⇢ HTTP GET "/blocking/aop" [ExceptionHandlingWebHandler]
Original Stack Trace:
		at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:106) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxFilter$FilterSubscriber.onNext(FluxFilter.java:113) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoCreate$DefaultMonoSink.success(MonoCreate.java:176) ~[reactor-core-3.6.0.jar:3.6.0]
		at kotlinx.coroutines.reactor.MonoCoroutine.onCompleted(Mono.kt:103) ~[kotlinx-coroutines-reactor-1.7.3.jar:na]
		at kotlinx.coroutines.AbstractCoroutine.onCompletionInternal(AbstractCoroutine.kt:93) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.JobSupport.finalizeFinishingState(JobSupport.kt:237) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath(JobSupport.kt:910) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:867) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:832) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.debug.internal.DebugProbesImpl$CoroutineOwner.resumeWith(DebugProbesImpl.kt:549) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46) ~[kotlin-stdlib-1.9.0.jar:1.9.0-release-358]
		at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:108) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.EventLoop.processUnconfinedEvent(EventLoop.common.kt:68) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.DispatchedTaskKt.resumeUnconfined(DispatchedTask.kt:245) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:163) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:474) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:508) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:497) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.CancellableContinuationImpl.resumeWith(CancellableContinuationImpl.kt:368) ~[kotlinx-coroutines-core-jvm-1.7.3.jar:na]
		at kotlinx.coroutines.reactive.AwaitKt$awaitOne$2$1.onComplete(Await.kt:272) ~[kotlinx-coroutines-reactive-1.7.3.jar:na]
		at org.jooq.impl.R2DBC$AbstractSubscription.lambda$new$0(R2DBC.java:179) ~[jooq-3.18.7.jar:na]
		at org.jooq.impl.Internal$1.onComplete(Internal.java:497) ~[jooq-3.18.7.jar:na]
		at org.jooq.impl.R2DBC$AbstractResultSubscriber.lambda$onComplete$1(R2DBC.java:293) ~[jooq-3.18.7.jar:na]
		at org.jooq.impl.Internal$1.onComplete(Internal.java:497) ~[jooq-3.18.7.jar:na]
		at reactor.core.publisher.StrictSubscriber.onComplete(StrictSubscriber.java:123) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2231) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onComplete(MonoIgnoreThen.java:210) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onComplete(MonoIgnoreThen.java:210) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.pool.SimpleDequePool.maybeRecycleAndDrain(SimpleDequePool.java:537) ~[reactor-pool-1.0.3.jar:1.0.3]
		at reactor.pool.SimpleDequePool$QueuePoolRecyclerInner.onComplete(SimpleDequePool.java:767) ~[reactor-pool-1.0.3.jar:1.0.3]
		at reactor.core.publisher.Operators.complete(Operators.java:137) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoEmpty.subscribe(MonoEmpty.java:46) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.Mono.subscribe(Mono.java:4512) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.pool.SimpleDequePool$QueuePoolRecyclerMono.subscribe(SimpleDequePool.java:879) ~[reactor-pool-1.0.3.jar:1.0.3]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:241) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onComplete(MonoIgnoreThen.java:204) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.Operators.complete(Operators.java:137) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoEmpty.subscribe(MonoEmpty.java:46) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:264) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:241) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onComplete(MonoIgnoreThen.java:204) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreElements$IgnoreElementsSubscriber.onComplete(MonoIgnoreElements.java:89) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onComplete(FluxHandleFuseable.java:239) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoSupplier$MonoSupplierSubscription.request(MonoSupplier.java:148) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.request(FluxHandleFuseable.java:260) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreElements$IgnoreElementsSubscriber.onSubscribe(MonoIgnoreElements.java:72) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onSubscribe(FluxHandleFuseable.java:164) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoSupplier.subscribe(MonoSupplier.java:48) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:264) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.Mono.subscribe(Mono.java:4512) ~[reactor-core-3.6.0.jar:3.6.0]
		at org.jooq.impl.R2DBC$AbstractNonBlockingSubscription.lambda$cancel0$4(R2DBC.java:663) ~[jooq-3.18.7.jar:na]
		at java.base/java.util.concurrent.atomic.AtomicReference.updateAndGet(AtomicReference.java:210) ~[na:na]
		at org.jooq.impl.R2DBC$AbstractNonBlockingSubscription.cancel0(R2DBC.java:647) ~[jooq-3.18.7.jar:na]
		at org.jooq.impl.R2DBC$AbstractSubscription.complete(R2DBC.java:213) ~[jooq-3.18.7.jar:na]
		at org.jooq.impl.R2DBC$AbstractResultSubscriber.complete(R2DBC.java:303) ~[jooq-3.18.7.jar:na]
		at org.jooq.impl.R2DBC$AbstractResultSubscriber.onComplete(R2DBC.java:293) ~[jooq-3.18.7.jar:na]
		at reactor.core.publisher.StrictSubscriber.onComplete(StrictSubscriber.java:123) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxWindowPredicate$WindowPredicateMain.checkTerminated(FluxWindowPredicate.java:540) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxWindowPredicate$WindowPredicateMain.drainLoop(FluxWindowPredicate.java:488) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxWindowPredicate$WindowPredicateMain.drain(FluxWindowPredicate.java:432) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxWindowPredicate$WindowPredicateMain.onComplete(FluxWindowPredicate.java:312) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onComplete(MonoFlatMapMany.java:260) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onComplete(FluxContextWrite.java:126) ~[reactor-core-3.6.0.jar:3.6.0]
		at io.asyncer.r2dbc.mysql.internal.util.DiscardOnCancelSubscriber.onComplete(DiscardOnCancelSubscriber.java:84) ~[r2dbc-mysql-1.0.3.jar:1.0.3]
		at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onComplete(FluxPeekFuseable.java:940) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxHandle$HandleConditionalSubscriber.onNext(FluxHandle.java:359) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:854) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.SinkManyEmitterProcessor.drain(SinkManyEmitterProcessor.java:476) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.SinkManyEmitterProcessor.tryEmitNext(SinkManyEmitterProcessor.java:273) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.SinkManySerialized.tryEmitNext(SinkManySerialized.java:100) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.core.publisher.InternalManySink.emitNext(InternalManySink.java:27) ~[reactor-core-3.6.0.jar:3.6.0]
		at io.asyncer.r2dbc.mysql.client.ReactorNettyClient$ResponseSink.next(ReactorNettyClient.java:383) ~[r2dbc-mysql-1.0.3.jar:1.0.3]
		at io.asyncer.r2dbc.mysql.client.ReactorNettyClient.lambda$new$0(ReactorNettyClient.java:121) ~[r2dbc-mysql-1.0.3.jar:1.0.3]
		at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:185) ~[reactor-core-3.6.0.jar:3.6.0]
		at reactor.netty.channel.FluxReceive.drainReceiver(FluxReceive.java:294) ~[reactor-netty-core-1.1.13.jar:1.1.13]
		at reactor.netty.channel.FluxReceive.onInboundNext(FluxReceive.java:403) ~[reactor-netty-core-1.1.13.jar:1.1.13]
		at reactor.netty.channel.ChannelOperations.onInboundNext(ChannelOperations.java:426) ~[reactor-netty-core-1.1.13.jar:1.1.13]
		at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:114) ~[reactor-netty-core-1.1.13.jar:1.1.13]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.asyncer.r2dbc.mysql.client.MessageDuplexCodec.handleDecoded(MessageDuplexCodec.java:162) ~[r2dbc-mysql-1.0.3.jar:1.0.3]
		at io.asyncer.r2dbc.mysql.client.MessageDuplexCodec.channelRead(MessageDuplexCodec.java:73) ~[r2dbc-mysql-1.0.3.jar:1.0.3]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346) ~[netty-codec-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318) ~[netty-codec-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1475) ~[netty-handler-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1338) ~[netty-handler-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1387) ~[netty-handler-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:529) ~[netty-codec-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:468) ~[netty-codec-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290) ~[netty-codec-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.101.Final.jar:4.1.101.Final]
		at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.101.Final.jar:4.1.101.Final]
		at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

I guess this is due to updating AopUtils, which calls CoroutinesUtils.

I know this is really workaround way to invocate suspend function in AOP advice, so I can't help but think there are problems when updating the libraries.

Do you know another way to invocate suspend function in AOP advice?

Thank you.

[sdeleuze]

Can you please provide a reproducer as an attached archive or a link to a repsoitory?

[T45K]

@sdeleuze
thank you for checking this issue!
i prepared reproducing repo

https://github.com/T45K/spring-aop-around-repro

please take a look 🙏

[T45K]

ah, i found a solution by myself

@Component
@Aspect
class Aspect {
    @Around("xxx")
    fun execute(joinPoint: ProceedingJoinPoint): Any? = mono {
        callSuspendFunction()
    }.then(joinPoint.proceed() as Mono<*>)
}

this looks working fine

[sdeleuze]

Yeah, your solution looks fine. Before Spring Framework 6.1, there was no support for Coroutines in Spring AOP, so you had to invoke the suspending function manually like you did in your repro. As of Spring Framework 6.1, suspending functions are translated to their Reactive equivalent, as shown by your comment above.

[T45K]

thank you for answering.

i have another question.
do you (and spring team) have any plan to implement additional support for AOP Before and After, and Reactor (or coroutine) like the following style?

// return Mono directly as Before advice
@Before("...")
fun execute(joinPoint): Any? = mono {
  callSuspendFunction()
}

// or, use suspend function directly as Before advice
@Before("...")
suspend fun execute(joinPoint): Any {
  callSuspendFunction()
}