How to set envVars for multiproject? - scala

Question

I have sbt multi projects and try to set the envVars in the build.sbt for subprojects as following:
envVars in Test := Map("KAFKA_SERVER" -> "localhost:9092")
the test abort with following message:
[info] java.util.NoSuchElementException: None.get
[info] at scala.None$.get(Option.scala:349)
[info] at scala.None$.get(Option.scala:347)
[info] at io.khinkali.auth.AppSpec.<init>(AppSpec.scala:23)
[info] at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
In the test file, I tried to get the value as following:
sys.env.get("KAFKA_SERVER").get
Intellj provides the set the environment variable as following:
How to set an environment variable in sbt for subprojects also?
Update
The root build.sbt looks as following:
name := "bary"
scalacOptions += "-Ypartial-unification"
scalacOptions += "-feature"
addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.0" cross CrossVersion.full)
val Cats = "1.0.0"
val Shiro = "1.4.0"
val Logback = "1.2.3"
val CatsEffect = "0.5"
val Kafka = "1.0.0"
val Bean = "1.9.3"
val Circe = "0.9.0-M3"
val Log4j = "1.7.25"
val ScalaCheck = "1.13.4"
val Scalactic = "3.0.4"
val Scalatest = "3.0.4"
val JavaJwt = "3.3.0"
val Simulacrum = "0.11.0"
val Http4s = "0.18.0-M7"
lazy val commonSettings = Seq(
organization := "io.khinkali",
version := "0.1.0-SNAPSHOT",
scalaVersion := "2.12.4",
envVars in Test := Map("KAFKA_SERVER" -> "localhost:9092"),
fork in Test := true,
libraryDependencies ++= Seq(
"org.slf4j" % "slf4j-simple" % Log4j,
"ch.qos.logback" % "logback-core" % Logback,
"org.apache.shiro" % "shiro-all" % Shiro,
"org.typelevel" %% "cats-core" % Cats,
"org.typelevel" %% "cats-effect" % CatsEffect,
"org.apache.kafka" % "kafka-streams" % Kafka,
"org.apache.kafka" % "kafka-clients" % Kafka,
"commons-beanutils" % "commons-beanutils" % Bean,
"io.circe" %% "circe-core" % Circe,
"io.circe" %% "circe-generic" % Circe,
"io.circe" %% "circe-parser" % Circe,
"io.circe" %% "circe-literal" % Circe,
"com.github.mpilquist" %% "simulacrum" % Simulacrum,
"org.scalactic" %% "scalactic" % Scalactic,
"org.scalatest" %% "scalatest" % Scalatest % "test",
"org.scalacheck" %% "scalacheck" % ScalaCheck % "test",
),
resolvers ++= Seq(
"Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots"
),
fork in run := true,
)
lazy val root = (project in file("."))
.settings(commonSettings)
.settings(
name := "bary",
organization := "io.khinkali",
moduleName := "bary"
).
aggregate(
kafka_api,
auth_stream,
rest)
lazy val kafka_api = (project in file("kafka-api")).
settings(commonSettings).
settings(
name := "kafka-api",
moduleName := "kafka-api"
)
lazy val auth_stream = (project in file("auth-stream")).
settings(commonSettings).
settings(
name := "auth-stream",
moduleName := "auth-stream",
libraryDependencies ++= Seq(
"com.auth0" % "java-jwt" % JavaJwt,
)
).dependsOn(kafka_api)
lazy val rest = (project in file("rest")).
settings(commonSettings).
settings(
name := "rest",
moduleName := "rest",
libraryDependencies ++= Seq(
"org.http4s" %% "http4s-dsl" % Http4s,
"org.http4s" %% "http4s-blaze-server" % Http4s,
"org.http4s" %% "http4s-blaze-client" % Http4s,
"org.http4s" %% "http4s-circe" % Http4s,
)
).dependsOn(kafka_api, auth_stream)
I still got the exception.

Answer 1

Any setting you want to apply to a subproject can either be specified just for that subproject or in commonSettings, as shown in build.sbt below.
You did not show your multiproject definitions, so here is a short example. There are many ways of setting up these types of projects, and I am not going to elaborate on the possible ways; this is a complicated topic, and it has evolved a lot over the years, especially recently.
lazy val commonSettings = Seq(
envVars in Test := Map("KAFKA_SERVER" -> "localhost:9092"),
fork in Test := true, // required for envVars task to work
javacOptions ++= Seq(
"-Xlint:deprecation",
"-Xlint:unchecked",
"-source", "1.8",
"-target", "1.8",
"-g:vars"
),
licenses += ("Apache-2.0", url("https://www.apache.org/licenses/LICENSE-2.0.html")),
version := "0.5.0"
)
lazy val demo = project
.settings(commonSettings:_*)
.settings(
name := "demo"
).dependsOn(root)
lazy val root = (project in file("root"))
.settings(commonSettings:_*)
.settings(
name := "root"
)
One more important fact: The environment setting for test will not be respected when run with the IntelliJ IDEA test runner. As a workaround, you can set environment variables in the Run/Debug Configurations -> Environment variables window. When you run sbt test, however, the environment variable specified in build.sbt will be set.
Normally, the only way to apply an environment variable to a process is to start the process with that environment variable. If you want SBT to run your program in an environment with a certain environment variable, it will need to be launched in a new environment. This is called forking.