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[EXPERIMENT] test with pekko 2.0.0-M2#13741

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[EXPERIMENT] test with pekko 2.0.0-M2#13741
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@pjfanning pjfanning commented Jan 15, 2026 •
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  • pekko-http 2.0.0-M2 is released
  • it could be a number of months before 2.0.0 is released and it is not worth delaying Play releases for
  • this is just an experiment to see what Play code needs to change

@pjfanning pjfanning marked this pull request as draft January 15, 2026 10:58
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pjfanning commented Jan 15, 2026

@mkurz I raised #13744 which is a non-trivial change needed to the websocket code and there are a couple of other changes needed to

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mkurz commented Apr 22, 2026

@pjfanning failure in docs

[error] -- [E008] Not Found Error: /home/runner/work/playframework/playframework/documentation/manual/working/commonGuide/configuration/code/CustomPekkoHttpServer.scala:33:20 
[error] 33 |    defaultSettings.withWebsocketRandomFactory(() => new Random())
[error]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[error]    |value withWebsocketRandomFactory is not a member of org.apache.pekko.http.scaladsl.settings.ServerSettings, but could be made available as an extension method.
[error]    |
[error]    |The following import might make progress towards fixing the problem:
[error]    |
[error]    |  import org.apache.pekko.http.impl.util.JavaMapping.Implicits.convertToScala
[error]    |

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mkurz commented Apr 22, 2026

Two more:

[error] -- [E008] Not Found Error: /home/runner/work/playframework/playframework/transport/server/play-pekko-http-server/src/test/scala/play/core/server/pekkohttp/PekkoHeadersWrapperTest.scala:17:40 
[error] 17 |      val request        = emptyRequest.copy()
[error]    |                           ^^^^^^^^^^^^^^^^^
[error]    |value copy is not a member of org.apache.pekko.http.scaladsl.model.HttpRequest, but could be made available as an extension method.
[error]    |
[error]    |One of the following imports might fix the problem:
[error]    |
[error]    |  import org.specs2.control.Properties.aProperty
[error]    |  import org.specs2.specification.Tables.toDataRow
[error]    |  import org.specs2.matcher.DataTables.toDataRow
[error]    |
[error] one error found

[error] /home/runner/work/playframework/playframework/core/play-integration-test/src/test/java/play/it/http/websocket/WebSocketSpecJavaActions.java:34:18: cannot find symbol
[error]   symbol:   method fromFuture(scala.concurrent.Future<java.lang.Object>)
[error]   location: class org.apache.pekko.stream.javadsl.Source
[error] Source.fromFuture
[error]                  ^

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mkurz commented Apr 22, 2026

@pjfanning if you could take a look, would be nice, thank you 🙏

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pjfanning commented Apr 22, 2026 •
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I'm away from my desk for most of today but can have a look in a few days. I'm expecting that there will be more issues than this remaining. The Java DSL in Pekko now tends to only support CompletionStages. There were a few methods added to newer versions of Pekko 1.x to fill in some gaps where some some Java DSL methods only accepted Scala Futures.

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pjfanning commented Apr 22, 2026

This one is left

[error] /home/runner/work/playframework/playframework/documentation/manual/working/javaGuide/main/async/code/javaguide/async/JavaStream.java:233:60: cannot find symbol
[error]   symbol:   method dropNew()
[error]   location: class org.apache.pekko.stream.OverflowStrategy
[error] OverflowStrategy.dropNew

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pjfanning commented Apr 25, 2026

Doc build still fails because an upgraded Agrona dependency uses sun.misc.Unsafe.

[error] Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.IllegalAccessError: class org.agrona.UnsafeApi (in unnamed module @0xa88ffd8) cannot access class jdk.internal.misc.Unsafe (in module java.base) because module java.base does not export jdk.internal.misc to unnamed module @0xa88ffd8 [in thread "specs2-4"]
[error]     at org.agrona.UnsafeApi.getUnsafe(UnsafeApi.java)
[error]     at org.agrona.UnsafeApi.<clinit>(UnsafeApi.java)

In Pekko build, we add "--add-opens=java.base/jdk.internal.misc=ALL-UNNAMED" to workaround this.

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He-Pin commented May 25, 2026

This can be updated to 2.0.0-M2 now

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He-Pin commented May 25, 2026

Is there any performance difference with wrk?

@pjfanning pjfanning changed the title [EXPERIMENT] test with pekko 2.0.0-M1 [EXPERIMENT] test with pekko 2.0.0-M2 May 25, 2026
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pjfanning commented May 25, 2026

code compiles but the build now needs to set an --add-opens for the Agrona lib to use sun.misc.Unsafe.

[error] Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.IllegalAccessError: class org.agrona.UnsafeApi (in unnamed module @0x14ff0af5) cannot access class jdk.internal.misc.Unsafe (in module java.base) because module java.base does not export jdk.internal.misc to unnamed module @0x14ff0af5 [in thread "specs2-3"]
[error]     at org.agrona.UnsafeApi.getUnsafe(UnsafeApi.java)
[error]     at org.agrona.UnsafeApi.<clinit>(UnsafeApi.java)
[error]     at org.agrona.concurrent.AbstractConcurrentArrayQueue.<clinit>(AbstractConcurrentArrayQueue.java:126)
[error]     at org.apache.pekko.remote.artery.EnvelopeBufferPool.<init>(EnvelopeBufferPool.scala:37)
[error]     at org.apache.pekko.remote.artery.ArteryTransport.<init>(ArteryTransport.scala:354)
[error]     at org.apache.pekko.remote.artery.tcp.ArteryTcpTransport.<init>(ArteryTcpTransport.scala:82)
[error]     at org.apache.pekko.remote.RemoteActorRefProvider.init(RemoteActorRefProvider.scala:259)
[error]     at org.apache.pekko.cluster.ClusterActorRefProvider.init(ClusterActorRefProvider.scala:60)
[error]     at org.apache.pekko.actor.ActorSystemImpl._start$lzyINIT1(ActorSystem.scala:1085)
[error]     at org.apache.pekko.actor.ActorSystemImpl._start(ActorSystem.scala:1081)
[error]     at org.apache.pekko.actor.ActorSystemImpl.start(ActorSystem.scala:1104)
[error]     at org.apache.pekko.actor.ActorSystem$.apply(ActorSystem.scala:284)
[error]     at play.api.libs.concurrent.ActorSystemProvider$.start(Pekko.scala:243)

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@pjfanning @mkurz @He-Pin