Is anyone seeing constant Undertow server errors i...

# http4k

[Andrew O'Hara]

Is anyone seeing constant Undertow server errors in the latest http4k 4.33.1.0 version? It doesn't seem to actually break anything, but the volume of error logs are a problem.

UT005013: An IOException occurred
java.io.IOException: UT000034: Stream is closed
        at io.undertow.channels.DetachableStreamSourceChannel.getOption(DetachableStreamSourceChannel.java:200)
        at io.undertow.io.UndertowInputStream.<init>(UndertowInputStream.java:71)
        at io.undertow.server.HttpServerExchange$DefaultBlockingHttpExchange.getInputStream(HttpServerExchange.java:2001)
        at io.undertow.server.HttpServerExchange.getInputStream(HttpServerExchange.java:1615)
        at org.http4k.server.Http4kUndertowHttpHandler.asRequest(Http4kUndertowHttpHandler.kt:34)
        at org.http4k.server.Http4kUndertowHttpHandler.handleRequest(Http4kUndertowHttpHandler.kt:37)
        at io.undertow.server.Connectors.executeRootHandler(Connectors.java:391)
        at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:859)
        at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
        at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2513)
        at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1538)
        at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1282)
        at java.base/java.lang.Thread.run(Thread.java:833)

[dave]

hmmm - not seeing anything (but haven't been looking particularly). can you try to force the undertow version back to 2.2.20.Final and see if it goes away (and then raise in their Github)?

[Andrew O'Hara]

So this is also an issue in http4k 4.33.0.0, and it's not always reproducible; maybe windows versus linux, or amd64 versus arm64, who knows.

And forcing undertow back did fix the issue. I think for now I'll just switch to the Jetty backend, but I'll be on the lookout for more reproducible scenarios in the future.