Bazel with Scala/Lobby

discuss the bazel scala rules: https://github.com/bazelbuild/rules_scala

P. Oscar Boykin

@johnynek

no, you don't want to do that... you want to look at bazel test suites

each test target should be a scala_test... those are atomic.... those will be run by a single process by bazel.

you control your test parallelism by splitting those targets.

note: fine grain test targets also results in better test caching in your CI. If you have big mega targets in bazel, you don't get much mileage out of using bazel honesty

Joe Netti

@nettijoe96

Hi, can someone help me using scala_import?

P. Oscar Boykin

@johnynek

what is your question?

PS: it is generally best to just ask because now I'm stepping away a bit and you will have to wait for another RTT for the next response

Joe Netti

@nettijoe96

sounds good. I'm going to get a more specific question and get back to you

Joe Netti

@nettijoe96

Hi, I'm trying to use play framework with bazel. However, scala_binary requires a main class and there is no main for play framework. I see this repo but I can't seem to duplicate it. What do I set main_class to?

Joe Netti

@nettijoe96

Screen Shot 2020-12-22 at 5.05.13 PM.png

(this doesn't work) ^^

Peter Hrvola

@hrvolapeter

Hello, I'm getting a bit weird error when defining custom dependencies with scala_proto. I've followed the docs at https://github.com/bazelbuild/rules_scala/blob/master/docs/scala_proto_library.md I've added the scalapb_toolchain and default_deps_toolchain but I'm getting error

File "/private/var/tmp/_bazel_hrvolap/cbad7e6dac15bf07632f0b5b890ca227/external/io_bazel_rules_scala/scala/private/toolchain_deps/toolchain_deps.bzl", line 13, column 9, in _lookup_provider_by_id
        fail(_required_deps_id_message(ctx.attr.name, toolchain_type_label, deps_id))
Error in fail: scalapb_worker_deps requires mapping of scalapb_worker_deps provider id on the toolchain @io_bazel_rules_scala//scala_proto:deps_toolchain_type

which seems like needs to be added to toolchain, but when I added it as a dep_provider to the default_deps_toolchain I get dependency cycle.

Also the whole story why I want custom dependencies because grpc client dependency is overlapping with dependencies for bigtable and version are not compatible

Peter Hrvola

@hrvolapeter

SOLVED
I've redefined in my workspace

declare_deps_provider(
    name = "scalapb_worker_deps_provider",
    deps_id = "scalapb_worker_deps",
    visibility = ["//visibility:public"],
    deps = [
        "@com_google_protobuf//:protobuf_java",
        "//third_party/jvm/com/thesamet/scalapb:protoc_bridge",
        "//third_party/jvm/com/thesamet/scalapb:compilerplugin",
    ],
)

and included it in default_deps_toolchain, then everything worked

Sebastian Voss

@sebastianvoss

Hi, I'm running into a java.lang.StackOverflowError on bazel build -s //.... I already tried to increase the stack size with bazel --host_jvm_args=-Xss32m build -s //... but it does not show any effect. Is this the right way to increase it?

Krish Narukulla

@krisnaru

how do query/list installed maven dependencies?

latyas

@ly0

Hi, guys, greetings. I have trouble in generating dependencies by bazel-deps,
here is my config in dependencies.yaml

  org.scalamacros:
    paradise:
      lang: scala
      version: "2.1.0"

it gave me

[ForkJoinPool-1-worker-15] ERROR bazel_deps.CoursierResolver - not found: https://repo.maven.apache.org/maven2/org/scalamacros/paradise_2.12/2.1.0/paradise_2.12-2.1.0.pom

but actually I want https://repo.maven.apache.org/maven2/org/scalamacros/paradise_2.12.0/2.1.0/paradise_2.12.0-2.1.0.pom
is it anything wrong in my dependencies.yaml? Thank you guys so much :-)

And the X question is I want org.scalamacros.paradise in plugins when I define scala_library, and I need to add this into my dependencies.

Daniel LaFlamme

@dlaflamme

is there any way to override URLs specified here without changing the code? https://github.com/bazelbuild/rules_scala/blob/master/scala/scala_cross_version.bzl#L18

meaning, override when using rules_scala in bazel WORKSPACE file

Daniel LaFlamme

@dlaflamme

for others, the answer appears to be "NO". Potential solutions are using the functionality here: bazelbuild/bazel#12170, or doing something similar with an HTTP/HTTPs proxy.

Ghost

@ghost~6047c92a6da03739846691e0

Hello!
We are using scalapb with bazel and not sbt. Is there a way to flip on javaConversions=true with bazel so I can get the nice sauce methods like toJavaProto and fromJavaProto. The scalapb docs only show how to enable this with sbt https://scalapb.github.io/docs/sbt-settings/

Mark de Jong

@Fristi

Hi there!

What is the recommend way of working with scala and bazel? I've tried a setup with bazelbuild/rules_scala and rules_jvm_external. With that I get compile errors saying there are missing classes on the classpath. Like described here: bazelbuild/rules_jvm_external#578

I was expecting the rules_jvm_external would resolve the transitive dependencies, but this seems not the case.

Mark de Jong

@Fristi

I also came across greyhound which is a kafka zio client but depends on a fork of rules_scala. Did not try it yet, but I wonder what's the best way forward

Ruixi Fan

@rfan-debug

@rrampr we are also facing the same problem. Have you found any viable way to enable javaConversions=True with bazel?

Paulo Coutinho

@paulocoutinhox

Hi,

The generated jar/binary always return null on version:

Main.getClass.getPackage.getImplementationVersion

There is any way to add version to the package?

Thanks.

Paulo Coutinho

@paulocoutinhox

hi, please anyone can support this: bazelbuild/rules_scala#166 ?

Thomas Anagrius

@anagrius

Is it possible to configure a custom scalac binary i rules_scala?

eine-doodka

@eine-doodka

Hey, what is the latest version of rules_scala? I can't import it into my bazel project, the copy-paste instruction looks outdated

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