2.2.0.M3 -> 2.2.0.M4 NoSuchMethodError: ...transaction.reactive.TransactionSynchronizationManager.currentTransaction()Lreactor/core/publisher/Mono;

[daggerok]

Hello spring team!

On 2.2.0.M3 -> 2.2.0.M4 upgrade I got an error:

NoSuchMethodError: org.springframework.transaction.reactive.TransactionSynchronizationManager.currentTransaction()Lreactor/core/publisher/Mono;

I have prepared repository where issue can be reproduced here (see spring-boot-M3-to-M4-migration branch and appropriate Travis CI with errors and full stack trace:

2019-06-19 22:30:45.274 WARN  tp-epoll-2 [ i.n.u.ReferenceCountUtil  safeRelease               ] - Failed to release a message: DefaultLastHttpContent(data: PooledSlicedByteBuf(freed), decoderResult: success)
io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1
	at io.netty.util.internal.ReferenceCountUpdater.toLiveRealRefCnt(ReferenceCountUpdater.java:74)
	at io.netty.util.internal.ReferenceCountUpdater.release(ReferenceCountUpdater.java:138)
	at io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:100)
	at io.netty.handler.codec.http.DefaultHttpContent.release(DefaultHttpContent.java:94)
	at io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:88)
	at io.netty.util.ReferenceCountUtil.safeRelease(ReferenceCountUtil.java:113)
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:120)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:190)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297)
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1408)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)
	at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:796)
	at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:432)
	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:333)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:906)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)
2019-06-19 22:30:45.281 WARN  tp-epoll-2 [ r.n.channel.FluxReceive   warn                      ] - [id: 0xe2a31189, L:/127.0.0.1:8080 - R:/127.0.0.1:39696] An exception has been observed post termination, use DEBUG level to see the full stack: java.lang.NoSuchMethodError: org.springframework.transaction.reactive.TransactionSynchronizationManager.currentTransaction()Lreactor/core/publisher/Mono;

Please let me know if you know which reactor-core version I should use with looking method signature. Thanks!

---

Regards,
Maksim

[wilkinsona]

The experimental R2DBC integration that you are using is not compatible with the latest Spring Framework milestone due to this change. We can’t do anything about this in Spring Boot. I believe you will either have to stick on Boot 2.2 M3 or wait for a new release of the experimental R2DBC integration.

[daggerok]

Thanks @wilkinsona for your feedback