I am building an Akka HTTP application using Scala 3 and SBT and it was running fine at the start.
But when I added the new dependencies below to build.sbt, the app began giving the error modules were resolved with conflicting cross-version suffixes in ProjectRrf.
The new dependencies added are: akka-http-circe, akka-http-json4s, json4s-native, circe-generic, scala-logging.
To make the dependencies compatible with scala3, I wrapped some of them using .cross(CrossVersion.for3Use2_13).
What could be the cause of this error?
Thanks in advance!
The New dependencies added:
("com.typesafe.scala-logging" %% "scala-logging" % "3.9.3").cross(CrossVersion.for3Use2_13),
("de.heikoseeberger" %% "akka-http-circe" % "1.39.2").cross(CrossVersion.for3Use2_13),
("de.heikoseeberger" %% "akka-http-json4s" % "1.39.2").cross(CrossVersion.for3Use2_13),
("org.json4s" %% "json4s-native" % "4.1.0-M4").cross(CrossVersion.for3Use2_13),
("io.circe" %% "circe-generic" % "0.15.0-M1").cross(CrossVersion.for3Use2_13),
build.sbt:
lazy val akkaHttpVersion = "10.6.3"
lazy val akkaVersion = "2.9.4"
resolvers += "Akka library repository".at("https://repo.akka.io/maven")
fork := true
lazy val root = (project in file(".")).
settings(
inThisBuild(List(
organization := "com.example",
scalaVersion := "3.3.3"
)),
name := "eskimi-bidding-agent",
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http" % akkaHttpVersion,
"com.typesafe.akka" %% "akka-http-spray-json" % akkaHttpVersion,
"com.typesafe.akka" %% "akka-actor-typed" % akkaVersion,
"com.typesafe.akka" %% "akka-stream" % akkaVersion,
"com.typesafe.akka" %% "akka-pki" % akkaVersion,
("com.typesafe.scala-logging" %% "scala-logging" % "3.9.3").cross(CrossVersion.for3Use2_13),
("de.heikoseeberger" %% "akka-http-circe" % "1.39.2").cross(CrossVersion.for3Use2_13),
("de.heikoseeberger" %% "akka-http-json4s" % "1.39.2").cross(CrossVersion.for3Use2_13),
("org.json4s" %% "json4s-native" % "4.1.0-M4").cross(CrossVersion.for3Use2_13),
("io.circe" %% "circe-generic" % "0.15.0-M1").cross(CrossVersion.for3Use2_13),
"ch.qos.logback" % "logback-classic" % "1.2.11",
"com.typesafe.akka" %% "akka-http-testkit" % akkaHttpVersion % Test,
"com.typesafe.akka" %% "akka-actor-testkit-typed" % akkaVersion % Test,
"org.scalatest" %% "scalatest" % "3.2.12" % Test
)
)
You didn't include the most significant part of the error. It's
[error] Modules were resolved with conflicting cross-version suffixes in ProjectRef(uri("file:/path/to/yourproject/"), "root"):
[error] com.typesafe.akka:akka-http-core _3, _2.13
[error] com.typesafe.akka:akka-parsing _3, _2.13
[error] com.typesafe.akka:akka-http _3, _2.13
Since you write
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http" % akkaHttpVersion,
"com.typesafe.akka" %% "akka-http-spray-json" % akkaHttpVersion,
"com.typesafe.akka" %% "akka-actor-typed" % akkaVersion,
"com.typesafe.akka" %% "akka-stream" % akkaVersion,
"com.typesafe.akka" %% "akka-pki" % akkaVersion,
probably you prefer to use _3 versions of libraries rather than _2.13 whenever possible.
So you should exclude
com.typesafe.akka:akka-http-core _2.13
com.typesafe.akka:akka-parsing _2.13
com.typesafe.akka:akka-http _2.13
If you do sbt dependencyTree you'll see where akka-http-core _2.13 is used
[info] +-de.heikoseeberger:akka-http-circe_2.13:1.39.2 [S]
[info] | +-com.typesafe.akka:akka-http_2.13:10.2.7 [S]
[info] | | +-com.typesafe.akka:akka-http-core_2.13:10.2.7 [S]
[info] +-de.heikoseeberger:akka-http-json4s_2.13:1.39.2 [S]
[info] | +-com.typesafe.akka:akka-http_2.13:10.2.7 [S]
[info] | | +-com.typesafe.akka:akka-http-core_2.13:10.2.7 [S]
So modify dependencies using .exclude(...)
libraryDependencies ++= Seq(
...
("de.heikoseeberger" %% "akka-http-circe" % "1.39.2").cross(CrossVersion.for3Use2_13)
.exclude("com.typesafe.akka", "akka-http-core_2.13"),
("de.heikoseeberger" %% "akka-http-json4s" % "1.39.2").cross(CrossVersion.for3Use2_13)
.exclude("com.typesafe.akka", "akka-http-core_2.13"),
...
Now the error is
[error] Modules were resolved with conflicting cross-version suffixes in ProjectRef(uri("file:/path/to/yourproject/"), "root"):
[error] com.typesafe.akka:akka-http _3, _2.13
(Probably what we excluded is enough to exclude akka-parsing _2.13 too.)
If you do sbt dependencyTree again you'll see where akka-http _2.13 is used
[info] +-de.heikoseeberger:akka-http-circe_2.13:1.39.2 [S]
[info] | +-com.typesafe.akka:akka-http_2.13:10.2.7 [S]
[info] +-de.heikoseeberger:akka-http-json4s_2.13:1.39.2 [S]
[info] | +-com.typesafe.akka:akka-http_2.13:10.2.7 [S]
So .exclude(...) again
libraryDependencies ++= Seq(
...
("com.typesafe.scala-logging" %% "scala-logging" % "3.9.3").cross(CrossVersion.for3Use2_13),
("de.heikoseeberger" %% "akka-http-circe" % "1.39.2").cross(CrossVersion.for3Use2_13)
.exclude("com.typesafe.akka", "akka-http-core_2.13")
.exclude("com.typesafe.akka", "akka-http_2.13"),
("de.heikoseeberger" %% "akka-http-json4s" % "1.39.2").cross(CrossVersion.for3Use2_13)
.exclude("com.typesafe.akka", "akka-http-core_2.13")
.exclude("com.typesafe.akka", "akka-http_2.13"),
...
Now the project is built successfully.
You can also write this as
libraryDependencies ++= Seq(
...
) ++ Seq(
("de.heikoseeberger" %% "akka-http-circe" % "1.39.2").cross(CrossVersion.for3Use2_13),
("de.heikoseeberger" %% "akka-http-json4s" % "1.39.2").cross(CrossVersion.for3Use2_13)
).map(_
.exclude("com.typesafe.akka", "akka-http-core_2.13")
.exclude("com.typesafe.akka", "akka-http_2.13")
)
sbt 1.10.2