I want to use Gatling in my Scala 3 / sbt Project.
The problem is that Gatling packages its library without Version-Postfix. So I think you have the same problem for any Scala library that does that.
I tried a few things, for example:
Adding the dependency according to the documentation:
libraryDependencies += "io.gatling" % "gatling-test-framework" % "3.7.2" % "test"
Gives:
Modules were resolved with conflicting cross-version suffixes in ProjectRef(uri("file:.../"), "api"):
com.softwaremill.quicklens:quicklens _3, _2.13
And
According to the Scala 3 Documentation:
libraryDependencies += ("io.gatling" % "gatling-test-framework" % "3.7.2" % "test").cross(CrossVersion.for3Use2_13)
Gives:
not found: https://repo1.maven.org/maven2/io/gatling/gatling-test-framework_2.13/3.7.2/gatling-test-framework_2.13-3.7.2.pom
Is there a way?
Not sure why but gatling-test-framework is not published with the version postfix as you said.
This means that you don't need/can't use the for3Use2_13 as there is no 2.13 version nor 3 version: there's just a single version without postfix.
Looking at its dependencies, version 3.7.2 targets Scala 2.13: https://mvnrepository.com/artifact/io.gatling/gatling-test-framework/3.7.2. As Scala 3 is compatible with Scala 2.13, it should be just fine with your first attempt.
Not sure where the conflict with quicklens comes from but if it comes from Gatling dependency, you can probably exclude the _2.13 version from Gatling (or even globally) as you are pulling the _3 version yourself:
libraryDependencies += "io.gatling" % "gatling-test-framework" % "3.7.2" % "test" exclude("com.softwaremill.quicklens" % "quicklens")
Related
I'm pretty new to scala. While upgrading a multi-module project to Scala 2.13, I found this dependency that is compiled in Scala 2.12 which throws class not found exception during runtime
java.lang.NoClassDefFoundError: scala/collection/mutable/ArrayOps$ofRef
This class is removed in 2.13. It is available only until 2.12. I am looking for a way to enforce v2.12 to compile only this dependency.
I tried to use cross-building but that does not work for a core library, because the dependency url constructed using:
"org.scala-lang" % "scala-library" % scalaVersion.value
looks like
https://repo1.maven.org/maven2/org/scala-lang/scala-library_2.12.15/2.12.15/scala-library_2.12.15-2.12.15.pom
Also, cross-building seems to be the way to allow compiling sub-modules with different scala versions with their compatible dependency versions, not meant for enforcing scala versions on individual dependencies.
Edit 1:
This is the build definition:
root
|
main
|---dependency w/o 2.13 build
|
acceptanceTests
|---dependency w/o 2.13 build
|
(other modules)
The dependency is an internal commons library. This uses the class scala/collection/mutable/ArrayOps during compile time. From scala-lang -> scala-library.
My questions:
Is it even possible to do this? Or is my only option to downgrade to 2.12 as mentioned here
Why 'core' libraries do not follow the url patters of external libraries like:
[organisation]/[module](_[scalaVersion])(_[sbtVersion])/[revision].
`Instead it looks like https://repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.15/scala-library-2.12.15.pom
You can do stuff like this:
libraryDependencies ++= {
CrossVersion.partialVersion(Keys.scalaVersion.value) match {
case Some((2, 12)) => Seq(
"com.typesafe.play" %% "play-json" % "2.6.13"
)
case Some((2, 11)) => Seq(
"com.typesafe.play" %% "play-json" % "2.5.18"
)
case _ => Seq (
"com.typesafe.play" %% "play-json" % "2.4.11"
)
}
}
Does anyone have a bare-bones zio-grpc server, with codegen in the project also, working with Scala 3?
I started with the HelloWorld project from their repo and attempted to get it to build with scalaVersion := "3.1.0"
Here is the relevant section in plugins.sbt:
libraryDependencies ++= Seq(
"com.thesamet.scalapb.zio-grpc" % "zio-grpc-codegen_2.13" % zioGrpcVersion,
"com.thesamet.scalapb" % "compilerplugin_2.13" % "0.11.1"
)
excludeDependencies ++= Seq(
ExclusionRule("org.scala-lang.modules", "scala-collection-compat_2.12"),
ExclusionRule("com.thesamet.scalapb", "protoc-bridge_2.12")
)
and in build.sbt:
libraryDependencies ++= Seq(
"io.grpc" % "grpc-netty" % grpcVersion,
"com.thesamet.scalapb" % "scalapb-runtime-grpc_2.13" % scalapb.compiler.Version.scalapbVersion
)
excludeDependencies ++= Seq(
ExclusionRule("org.scala-lang.modules", "scala-collection-compat_2.12"),
ExclusionRule("com.thesamet.scalapb", "protoc-bridge_2.12")
)
Since Scala 3 can use 2.13 libraries, that's what I'm doing. (Of the three zio-grpc-related libs, one, zio-grpc-codegen, does not have a Scala 3 version, so 2.13 must be used at least for that one.)
I get this error from sbt with the versions as above:
java.lang.NoSuchMethodError: scala.package$.Seq()Lscala/collection/immutable/Seq$;
at protocbridge.gens$.java(gens.scala:17)
at protocbridge.gens$.(gens.scala:11)
If I remove either of the scala-collection-compat exclusions, we get
[error] Modules were resolved with conflicting cross-version suffixes in ProjectRef(uri("file:/Users/xxx/dev/zio-grpc/examples/helloworld/project/"), "helloworld-build"):
[error] com.thesamet.scalapb:protoc-bridge _2.12, _2.13
[error] com.thesamet.scalapb:compilerplugin _3, _2.13
In short, I cannot find any permutation of Scala 2.13/3 versions of zio-grpc-codegen, compilerplugin_3, and scalapb-runtime-grpc that will not give some sbt conflicting cross-version suffix error.
TL;DR: this is not possible yet as some of the code you are using rely on macros and is not yet published for Scala3.
SBT plugins runs with Scala 2.12 no matter which Scala version is used in your project, thus you don't have to try to use plugins with _2.13 or _3 suffix, just use the regular syntax that will actually pick _2.12 artifacts.
That is, in plugins.sbt:
libraryDependencies ++= Seq(
"com.thesamet.scalapb.zio-grpc" %% "zio-grpc-codegen" % zioGrpcVersion,
"com.thesamet.scalapb" %% "compilerplugin" % "0.11.8"
)
(No need for any exclusion).
You can confirm this by looking at sbt logs and you should see that it downloads plugins for version 2.12 of Scala:
...
https://somerepository.com/com/thesamet/scalapb/zio-grpc/zio-grpc-codegen_2.12/0.5.1/zio-grpc-codegen_2.12-0.5.1.pom
https://somerepository.com/com/thesamet/scalapb/compilerplugin_2.12/0.11.8/compilerplugin_2.12-0.11.8.pom
...
Once you do that, you'll get an error as following dependencies do not exist:
com.thesamet.scalapb:scalapb-runtime_3:0.11.1
com.thesamet.scalapb:scalapb-runtime-grpc_3:0.11.1
com.thesamet.scalapb.zio-grpc:zio-grpc-core_3:0.5.0
For the 1st and 2nd, you just have to update the compilerplugin version to 0.11.8 as I did already above (the compilerplugin version is used for the main dependency scalapb-runtime-grpc).
For the 3rd, unfortunately it's not published yet for Scala 3. One attempt is to force the _2.13 version for this one with something like that in the build.sbt:
libraryDependencies += ("com.thesamet.scalapb.zio-grpc" %% "zio-grpc-core" % "0.5.1") cross CrossVersion.for3Use2_13
excludeDependencies += "com.thesamet.scalapb.zio-grpc" % "zio-grpc-core_3"
But this doesn't compile with some errors related to macros, and that is something that is not compatible between Scala 2.13 and 3. You cannot workaround that.
Remember you can check available versions of a lib for a Scala version on Maven central:
https://mvnrepository.com/artifact/com.thesamet.scalapb/compilerplugin
https://mvnrepository.com/artifact/com.thesamet.scalapb.zio-grpc/zio-grpc-core
I haven't released zio-grpc for Scala 3 as some tests related to Has were failing and were tricky to fix. At the same ZIO 2 is coming out and deprecated Has. There's a version of zio-grpc with ZIO 2 and Scala 3 support coming soon.
Today is my first day with Finch.
I am unable to find the right set of SBT dependencies for finch and finagle.
I have tried all the dependencies as shown in Image 2
You are using Scala 2.12 but your dependencies are for Scala 2.11.
This is the correct way to write what you need:
libraryDependencies += "com.github.finagle" %% "finch-core" % "0.13.0"
Build.scala, % and %% symbols meaning
I'm trying to use scala-time with scala 2.10, and have found that it doesn't work with sbt correctly.
given something like
scalaVersion := "2.10.2"
libraryDependencies += "org.scalaj" %% "scalaj-time" % "0.7"
sbt will happily try to resolve http://repo1.maven.org/maven2/org/scalaj/scalaj-time_2.10/0.7/scalaj-time_2.10-0.7.pom.
Unfortunately, scalaj-time is publised with full scala versions as can be seen at http://central.maven.org/maven2/org/scalaj/.
It can be resolved with
libraryDependencies += "org.scalaj" % "scalaj-time_2.10.2" % "0.7"
but I'm wanting to know if this is a change in sbt behaviour, a bug in scala-time's build or if there's a way to configure sbt to pass the 3-part version instead of 2-part.
As Seth noted jorgeortiz85/scala-time likely was published using sbt that predates binary cross versioning convention that was introduced in sbt 0.12. You could do:
libraryDependencies += "org.scalaj" % "scalaj-time_2.10.2" % "0.7"
or
libraryDependencies += "org.scalaj" % "scalaj-time" % "0.7" cross CrossVersion.full
But then you'd be stuck with using 2.10.2 while Scala 2.10.4 is already out.
There's a similar Joda time wrapper named nscala-time/nscala-time that seems more actively maintained. Last updated 3 days ago and Scala 2.11.0 is supported already, so that could also be your option.
libraryDependencies += "com.github.nscala-time" %% "nscala-time" % "1.0.0"
I have started working with Actors, and was following a simple example as mention in the Getting Started Guide.
Specs:
Scala Version: 2.9.2
Akka Version: 2.0
I ran the example and it ran well. Then I changed by sbt build script to:
name := "PracAkka"
scalaVersion := "2.9.2"
resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
libraryDependencies += "com.typesafe.akka" % "akka-actor_2.10" % "2.1.2"
i.e. I started using Akka 2.1.2. There were small changes and as per the migration guide, I made the respective changes. But still I am getting the below error:
class file needed by Props is missing. reference type ClassTag of package reflect refers to nonexisting symbol.
What do I need to change?
The documentation is quite clear I'd say: http://doc.akka.io/docs/akka/2.1.2/project/migration-guide-2.0.x-2.1.x.html
(I.e. Akka 2.1.x is for Scala 2.10)
From the sbt documentation
If you use groupID %% artifactID % revision rather than groupID %
artifactID % revision (the difference is the double %% after the
groupID), sbt will add your project's Scala version to the artifact
name. This is just a shortcut. You could write this without the %%:
libraryDependencies += "org.scala-tools" % "scala-stm_2.9.1" % "0.3"
Assuming the scalaVersion for your build is 2.9.1, the following is
identical:
libraryDependencies += "org.scala-tools" %% "scala-stm" % "0.3"
The idea is that many dependencies are compiled for multiple Scala
versions, and you'd like to get the one that matches your project.
Your script seems to be getting Akka for scala 2.10 in "akka-actor_2.10" try renaming to your scala version.