CS Knowledge Base

pjfanning · 2026-01-15T10:58:24Z

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 · 2026-01-15T22:26:07Z

@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

mkurz · 2026-04-22T11:19:30Z

@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]    |

mkurz · 2026-04-22T11:22:07Z

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]                  ^

mkurz · 2026-04-22T11:24:21Z

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

pjfanning · 2026-04-22T11:31:36Z

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.

pjfanning · 2026-04-22T21:15:05Z

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

pjfanning · 2026-04-25T11:17:07Z

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.

He-Pin · 2026-05-25T03:25:24Z

This can be updated to 2.0.0-M2 now

He-Pin · 2026-05-25T03:25:55Z

Is there any performance difference with wrk?

pjfanning · 2026-05-25T10:10:13Z

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)

He-Pin · 2026-06-10T18:11:42Z

Should be M3 now.

He-Pin · 2026-06-14T16:04:33Z

Maybe we can replace Agrona with jctools

pjfanning · 2026-06-17T17:39:33Z

I'm inclined to close this at this stage. It shows the code compiles but the tests run into at least 2 issues.

any tests that use pekko-remote need to have javaOptions that include --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
the sbt-plugin scripted tests run into issues with sbt evictionLevelWarnings. could set ThisBuild / evictionLevelWarnings := Level.Info while playing with milestone builds and remove them later but there are a lot of sbt files affected.

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

pjfanning force-pushed the pekko-2.0 branch from 1e4b349 to eb4f080 Compare January 15, 2026 13:46

mkurz force-pushed the pekko-2.0 branch from eb4f080 to 9a67e8f Compare January 15, 2026 22:20

mkurz force-pushed the pekko-2.0 branch from 944b1d2 to 65abb90 Compare April 22, 2026 10:44

Copilot AI mentioned this pull request Apr 22, 2026

Upgrade to Pekko 2.0.0-M1 and fix compile issues pjfanning/playframework#3

Draft

This was referenced Apr 22, 2026

use Source.completionStage instead of using a Scala Future #13897

Merged

avoid deprecated Pekko HttpRequest.copy() #13898

Merged

Fix websocket setting to use random factory #13899

Merged

mkurz force-pushed the pekko-2.0 branch from 46f0399 to 63f2b0c Compare April 22, 2026 20:58

pjfanning mentioned this pull request Apr 23, 2026

replace deprecated Source.actorRef with dropNew with Source.queue #13900

Merged

7 tasks

mkurz force-pushed the pekko-2.0 branch from 63f2b0c to c77fb43 Compare April 24, 2026 07:55

pjfanning force-pushed the pekko-2.0 branch from 9e37ff4 to 1da4b36 Compare May 25, 2026 09:24

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

pjfanning added 5 commits June 17, 2026 14:32

test with pekko 2.0.0-M1

ac802b9

Update BodyParsers.scala

9d54b56

Update NoMaterializer.scala

ea539fc

Update build.sbt

5453eef

gzipDecompress

970679f

mkurz and others added 4 commits June 17, 2026 14:33

MiMa filters

c2dd5e5

Remove Apache Maven Staging Repo resolver

96c021b

2.0.0-M2

c4fe8e0

remove deprecated classes that use UpgradeToWebSocket

b0b8009

mkurz force-pushed the pekko-2.0 branch from 9094d44 to b0b8009 Compare June 17, 2026 12:33

pjfanning added 2 commits June 17, 2026 18:16

Update pekkoVersion to 2.0.0-M3

77e7ab0

set Test / javaOptions

311aa5c

pjfanning changed the title ~~[EXPERIMENT] test with pekko 2.0.0-M2~~ [EXPERIMENT] test with pekko 2.0.0-Mx Jun 17, 2026

pjfanning added 2 commits June 17, 2026 18:54

Update BuildSettings.scala

184e69d

Update build.sbt

fec6ce9

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