Upgrading from 1 4 3 to 1 5 2 causes trouble with Netty Hell

Question

Upgrading from 1 4 3 to 1 5 2 causes trouble with Netty Hello all this is my first post to this Slack I use Ktor to build the backend of a platform where podcasts can get sponsorships through host read ads While trying to upgrade Ktor from 1 4 3 to 1 5 2 I ran in some trouble with Netty As I am still quite a newbie to the whole Kotlin Ktor ecosystem I have no clue what s going wrong I use a HOCON File for configuration I am lost Any hint where I can start to look for a reason is welcome Can someone please have a look at the stracktrace below ```Responding at <http 0 0 0 0 9090> Failed to initialize a channel Closing id 0xce532d4b L 0 0 0 0 0 0 0 1 9090 R 0 0 0 0 0 0 0 1 62473 java lang NoSuchMethodError kotlinx coroutines channels Channel kotlinx coroutines channels ChannelKt Channel$default int kotlinx coroutines channels BufferOverflow kotlin jvm functions Function1 int java lang Object at io ktor server netty cio NettyRequestQueue lt init gt NettyRequestQueue kt 19 at io ktor server netty NettyChannelInitializer configurePipeline NettyChannelInitializer kt 104 at io ktor server netty NettyChannelInitializer initChannel NettyChannelInitializer kt 89 at io ktor server netty NettyChannelInitializer initChannel NettyChannelInitializer kt 28 at io netty channel ChannelInitializer initChannel ChannelInitializer java 129 at io netty channel ChannelInitializer handlerAdded ChannelInitializer java 112 at io netty channel AbstractChannelHandlerContext callHandlerAdded AbstractChannelHandlerContext java 938 at io netty channel DefaultChannelPipeline callHandlerAdded0 DefaultChannelPipeline java 609 at io netty channel DefaultChannelPipeline access$100 DefaultChannelPipeline java 46 at io netty channel DefaultChannelPipeline$PendingHandlerAddedTask execute DefaultChannelPipeline java 1463 at io netty channel DefaultChannelPipeline callHandlerAddedForAllHandlers DefaultChannelPipeline java 1115 at io netty channel DefaultChannelPipeline invokeHandlerAddedIfNeeded DefaultChannelPipeline java 650 at io netty channel AbstractChannel$AbstractUnsafe register0 AbstractChannel java 502 at io netty channel AbstractChannel$AbstractUnsafe access$200 AbstractChannel java 417 at io netty channel AbstractChannel$AbstractUnsafe$1 run AbstractChannel java 474 at io netty util concurrent AbstractEventExecutor safeExecute AbstractEventExecutor java 164 at io netty util concurrent SingleThreadEventExecutor runAllTasks SingleThreadEventExecutor java 472 at io netty channel nio NioEventLoop run NioEventLoop java 500 at io netty util concurrent SingleThreadEventExecutor$4 run SingleThreadEventExecutor java 989 at io netty util internal ThreadExecutorMap$2 run ThreadExecutorMap java 74 at io ktor server netty EventLoopGroupProxy$Companion$create$factory$1$1 run NettyApplicationEngine kt 227 at io netty util concurrent FastThreadLocalRunnable run FastThreadLocalRunnable java 30 at java base java lang Thread run Thread java 832 ```

Rustam Siniukov · Answer

what version of coroutines do you use

Rustam Siniukov · Answer

and can you try `1 4 2 native mt`

Bertram Kirsch · Answer

Snap Problem solved Thank s a lot Here ist what happened I didn t set coroutines as an explicit dependency Instead I use whatever gets pulled in by io ktor ktor server netty as transitive dependency I missed an update to my new parent POM in one of my own dependencies That s why 1 3 9 native mt 2 was used instead of 1 4 2 native mt