java.lang.IllegalAccessError: failed to access class com.linecorp.armeria.server.AbstractContextPathServicesBuilder

[chungonn]

Compiler version

Scala version 3.3.3 and 3.5.1

Minimized code

The code below runs in Java. But in Scala, it throws an IllegalAccessError exception.

package experiment

import com.linecorp.armeria.common.HttpResponse
import com.linecorp.armeria.server.Server

@main def hello(): Unit =
  val server = Server.builder()
    .contextPath("/v1")
    .service("/", (ctx, req) => HttpResponse.of("Hello, world"))
    .and()
    .build()
    .start()

  println(s"server started = ${server}")

build.sbt

val scala3Version = "3.5.1"

lazy val root = project
  .in(file("."))
  .settings(
    name := "test-armeria",
    version := "0.1.0-SNAPSHOT",

    scalaVersion := scala3Version,

    libraryDependencies ++= Seq(
      "com.linecorp.armeria" % "armeria" % "1.30.1",
    )
  )

Output

Exception in thread "main" java.lang.IllegalAccessError: failed to access class com.linecorp.armeria.server.AbstractContextPathServicesBuilder from class experiment.Main$package$ (com.linecorp.armeria.server.AbstractContextPathServicesBuilder and experiment.Main$package$ are in unnamed module of loader 'app')
    at experiment.Main$package$.hello(Main.scala:9)
    at experiment.hello.main(Main.scala:6)

Expectation

The code should run without error.

[chungonn]

The same code works in Scala 2.12.13

package experiment

import com.linecorp.armeria.common.HttpResponse
import com.linecorp.armeria.server.Server
object Test {

  def main(args: Array[String]): Unit = {
    val server = Server.builder()
      .contextPath("/v1")
      .service("/", (ctx, req) => HttpResponse.of("Hello, world"))
      .and()
      .build()
      .start()

    println(s"server started = ${server}")
  }
}

val scala3Version = "2.12.13"

lazy val root = project
  .in(file("."))
  .settings(
    name := "test-armeria",
    version := "0.1.0-SNAPSHOT",

    scalaVersion := scala3Version,

    libraryDependencies ++= Seq(
      "com.linecorp.armeria" % "armeria" % "1.30.1",
    )
  )

[Gedochao]

This seems to have been fixed in nightly (3.6.1-RC1-bin-20241016-2fc299b-NIGHTLY), but not in 3.5.2-RC2. We might need to bisect the fix and backport to the LTS. cc @prolativ

The following works:

//> using scala 3.6.1-RC1-bin-20241016-2fc299b-NIGHTLY
//> using dep com.linecorp.armeria:armeria:1.30.1
package experiment

import com.linecorp.armeria.common.HttpResponse
import com.linecorp.armeria.server.Server
object Test {

  def main(args: Array[String]): Unit = {
    val server = Server.builder()
      .contextPath("/v1")
      .service("/", (ctx, req) => HttpResponse.of("Hello, world"))
      .and()
      .build()
      .start()

    println(s"server started = ${server}")
  }
}

[chungonn]

@Gedochao I confirmed that 3.6.1-RC1-bin-20241016-2fc299b-NIGHTLY fixes the problem

[chungonn]

I would be grateful if this fixed can be backport to the next possible 3.5.x. Thanks in advance

[Gedochao]

I would be grateful if this fixed can be backport to the next possible 3.5.x. Thanks in advance

It's likely too late for it to be backported to 3.5.2, unless we'd have another RC. which I'm hoping we won't as 3.5.2 (the last in the 3.5.x line) is being released as we speak. See:

• https://github.com/scala/scala3/issues/21781

tagging @WojciechMazur just in case. Otherwise, I'm guessing the fix would be included in 3.6.0 or 3.6.1

[chungonn]

Noted with thanks!

[WojciechMazur]

3.5.2 final has already been shipped. It will be backported to 3.6.0 or 3.6.1

[prolativ]

I needed to slightly modify the snippet to close the server so that it doesn't hang the bisecting tests. /tmp/bisect/ArmeriaServer.scala:

//> using dep com.linecorp.armeria:armeria:1.30.1

import com.linecorp.armeria.common.HttpResponse
import com.linecorp.armeria.server.Server
object Test {
  def main(args: Array[String]): Unit = {
    val server = Server.builder()
      .contextPath("/v1")
      .service("/", (ctx, req) => HttpResponse.of("Hello, world"))
      .and()
      .build()
    println(s"starting server")
    val started = server.start()
    started.get()
    println(s"server started")
    server.stop()
    println(s"server stopped")
  }
}

Bisected with

scala-cli project/scripts/bisect.scala -- --should-fail --releases 3.5.1-RC1-bin-20240628-1efbb92-NIGHTLY... run /tmp/bisect/ArmeriaServer.scala

The bisect points to https://github.com/scala/scala3/pull/21362

[WojciechMazur]

Ah, I've just bisected it to the same commit, adding sys.exit(0) would do the job as well for bisect purpose. I'll start backporting this to 3.6.0-RC1. I propose to close it after backporting to 3.3.5 LTS

[prolativ]

@WojciechMazur as far as I can see the issue was fixed on 10.08, which was before the cut-off of release-3.6.0, so this shouldn't need any backporting for 3.6.x. Or did I miss something?

[WojciechMazur]

That's correct, I've just checked to ensure it's included, so no work needed for Next release