Akka NoSuchElementException in RouteConcatenation$RouteWithConcatenation

[Matzz]

Hi,
I'm getting following error when using akka + tapir integration:

[otel.javaagent 2025-01-03 16:36:51:073 +0000] [xyz-akka.actor.default-dispatcher-28] DEBUG io.opentelemetry.javaagent.bootstrap.ExceptionLogger - Failed to handle exception in instrumentation for akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation
java.util.NoSuchElementException
	at java.base/java.util.ArrayDeque.removeFirst(Unknown Source)
	at java.base/java.util.ArrayDeque.pop(Unknown Source)
	at io.opentelemetry.javaagent.instrumentation.akkahttp.server.route.AkkaRouteHolder.restore(AkkaRouteHolder.java:68)
	at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation.$anonfun$$tilde$1(RouteConcatenation.scala:44)
	at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation.$anonfun$$tilde$2(RouteConcatenation.scala:47)
	at akka.http.scaladsl.util.FastFuture$.strictTransform$1(FastFuture.scala:40)
	at akka.http.scaladsl.util.FastFuture$.$anonfun$transformWith$3(FastFuture.scala:50)
	at scala.concurrent.impl.Promise$Transformation.run(Promise.scala:484)
	at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:64)
	at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:101)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:94)
	at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:101)
	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:49)
	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:48)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

As a result traces are recorded only with http method without path.

For the same endpoint defined without tapir it works fine.
tapir version 1.11.12
akka version 2.8.5

Tapir endpoint definition looks more or less like that:

  val definition =
    baseEndpoint.get
      .in("catalog" / "api" / "v1" / "actions")
      .in(QueryParams.actionIdOpt)
      .mapInTo[ActionEnpointInput]
      .out(statusCode.and(jsonBody[Seq[ActionMessage]]))

Steps to reproduce

Create scala application with tapir + akka http server. Instrument it with otel agent. Set OTEL_JAVAAGENT_DEBUG=true.

Expected behavior

OTEL will record span with http method and path.

Actual behavior

As a span name I get only method name without path.

Javaagent or library instrumentation version

2.11.0

Environment

JDK: AdoptOpenJDK OpenJDK 64-Bit Server VM 11.0.7+10
OS: Linux 5.10.230-223.885.amzn2.x86_64

Additional context

No response

[laurit]

Could you provide a minimal application that reproduces the issue along with any necessary instructions.

[github-actions]

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