Weird methanol exceptions

[cstamas]

Affected version

master

Bug description

Am testing master for unrelated reasons and I see these exceptions (maven master + resolver master):

[WARNING] [stderr] Nov 15, 2025 9:38:26 PM com.github.mizosoft.methanol.internal.flow.FlowSupport onDroppedException
[WARNING] [stderr] WARNING: Dropped exception: 
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.FlowSupport.lambda$onDroppedException$2(FlowSupport.java:169)
[WARNING] [stderr] 	at java.logging/java.util.logging.Logger.log(Logger.java:1147)
[WARNING] [stderr] 	at java.logging/sun.util.logging.internal.LoggingProviderImpl$JULWrapper.log(LoggingProviderImpl.java:268)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.FlowSupport.onDroppedException(FlowSupport.java:162)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.AbstractSubscription.consumePendingException(AbstractSubscription.java:185)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.AbstractSubscription.cancel(AbstractSubscription.java:103)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.ResponseSubscribers$HttpResponseInputStream.close(ResponseSubscribers.java:653)
[WARNING] [stderr] 	at org.eclipse.aether.transport.jdk.JdkTransporter.closeBody(JdkTransporter.java:408)
[WARNING] [stderr] 	at org.eclipse.aether.transport.jdk.JdkTransporter.implGet(JdkTransporter.java:325)
[WARNING] [stderr] 	at org.eclipse.aether.spi.connector.transport.AbstractTransporter.get(AbstractTransporter.java:64)
[WARNING] [stderr] java.io.IOException: chunked transfer encoding, state: READING_LENGTH
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.Utils.wrapWithExtraDetail(Utils.java:415)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.Http1Response$BodyReader.onReadError(Http1Response.java:676)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.checkForErrors(Http1AsyncReceiver.java:302)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.flush(Http1AsyncReceiver.java:268)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:182)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.HttpClientImpl$DelegatingExecutor.execute(HttpClientImpl.java:177)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:282)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:251)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.onReadError(Http1AsyncReceiver.java:516)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.lambda$handlePendingDelegate$3(Http1AsyncReceiver.java:380)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.Http1AsyncReceiver$Http1AsyncDelegateSubscription.cancel(Http1AsyncReceiver.java:163)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.common.HttpBodySubscriberWrapper$SubscriptionWrapper.cancel(HttpBodySubscriberWrapper.java:92)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.Upstream.cancel(Upstream.java:94)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.Upstream.cancel(Upstream.java:105)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.decoder.AsyncBodyDecoder$SubscriptionImpl.abort(AsyncBodyDecoder.java:332)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.AbstractSubscription.guardedAbort(AbstractSubscription.java:175)
[WARNING] [stderr] 	at com.github.mizosoft.methanol.internal.flow.AbstractSubscription.cancel(AbstractSubscription.java:102)
[WARNING] [stderr] 	at java.net.http/jdk.internal.net.http.ResponseSubscribers$HttpResponseInputStream.close(ResponseSubscribers.java:653)
[WARNING] [stderr] 	at org.eclipse.aether.transport.jdk.JdkTransporter.closeBody(JdkTransporter.java:408)
[WARNING] [stderr] 	at org.eclipse.aether.transport.jdk.JdkTransporter.implGet(JdkTransporter.java:325)
[WARNING] [stderr] 	at org.eclipse.aether.spi.connector.transport.AbstractTransporter.get(AbstractTransporter.java:64)
[WARNING] [stderr] 	at org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask(BasicRepositoryConnector.java:532)
[WARNING] [stderr] 	at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:463)
[WARNING] [stderr] 	at org.eclipse.aether.util.concurrency.RunnableErrorForwarder.lambda$wrap$0(RunnableErrorForwarder.java:66)
[WARNING] [stderr] 	at org.eclipse.aether.util.concurrency.SmartExecutor$Pooled.lambda$submit$0(SmartExecutor.java:91)
[WARNING] [stderr] 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
[WARNING] [stderr] 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
[WARNING] [stderr] 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
[WARNING] [stderr] 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
[WARNING] [stderr] 	at java.base/java.lang.Thread.run(Thread.java:1583)
[WARNING] [stderr] Caused by: java.io.IOException: subscription cancelled
[WARNING] [stderr] 	... 21 more

They seem non-deadly, as Maven did not fail

[cstamas]

@kwin ping

[kwin]

@cstamas Can you share links to the CI builds having those stack traces or share further details (OS, Java)?

[kwin]

I opened mizosoft/methanol#162 to allow to suppress these warnings. They seem to appear when closing the response body. Not sure under which circumstances exactly, but seems safe to ignore.

[cstamas]

This may be harmless, i just recorded the issue when I saw them.

I had these locally, while testing the master for locking issues, and used wondershaper https://github.com/magnific0/wondershaper to slow down network while doing massively parallel builds w empty local repository.

[cstamas]

We may want to wait for next methanol release? Not only due this, but also the retry interceptor...?

[kwin]

Yes, but from my perspective both issues are not blocking.