Mill build with logback config under resources

Question
1

I am using mill as my build tool. And I put the logback.xml - the config file for logback - under resources folder. However, it is not picked up by logback config. When I was using sbt, it took it from src/main/resources.
How do I get mill to put logback.xml in the right folder for logback to pick it up?

2

If you run the command

mill show <yourModulename>.resources

is logback.xml in the folder it displays?

1 Like
3

Unless you override def resources or mix-in one of the traits MavenModule or SbtModule, the default resource folder in Mill is resources, not src/main/resources. Your logback.xml is most likely not in the right location.

You can check with

> mill show __.resources

If that doesn’t bring clarity, please post your build.sc, so we don’t need to guess in the dark.

4

Yes, I am using resources folder. I tried putting logback.xml in resources and resources/podcaster (podcaster is my module name), but I am not getting logback to print logs.

$ ./mill show podcaster.resources
[1/1] show
1 targets failed
show Cannot resolve podcaster.resources. Try `mill resolve _` or `mill resolve __.resources` to see what's available.
$ ./mill show _.resources
[1/1] show > [1/1] test.resources
[
  "ref:v0:c984eca8:/Users/swadnerkar/Workspace/Scala/podcaster/test/resources"
]

And here is my build.sc

import mill._, scalalib._

object podcaster extends RootModule with ScalaModule {
  def scalaVersion = "3.5.0"
  // compile flags
  def scalacOptions = Seq(
    "-feature",
    "-deprecation"
  )
  def ivyDeps = Agg(
    ivy"com.lihaoyi::mainargs:0.7.2",
    ivy"com.softwaremill.sttp.client4::core:4.0.0-M17",
    ivy"org.scala-lang.modules::scala-xml:2.2.0",
    ivy"org.tomlj:tomlj:1.1.1",
    ivy"com.typesafe.scala-logging::scala-logging:3.9.5",
    ivy"ch.qos.logback:logback-classic:1.3.5"
  )

  object test extends ScalaTests {
    def ivyDeps = Agg(ivy"com.lihaoyi::utest:0.8.4")
    def testFramework = "utest.runner.Framework"
  }
}
5

You need to put it into

/Users/swadnerkar/Workspace/Scala/podcaster/test/resources

to have it when running the tests, or

/Users/swadnerkar/Workspace/Scala/podcaster/resources

to always have it on the classpath.

Your first mill show podcaster.resources gave you an error because you defined podcaster as RootModule. It is just mill show resources.

Also, check that your logback.xml is really configured to print to the console.

6

I started seeing the logs now!
I was experimenting and I had moved the logback.xml under resources/podcaster

swadnerkar[~/Workspace/Scala/podcaster]  (main*) $ ./mill show resources
[1/1] show > [1/1] resources
[
  "ref:v0:715b8e91:/Users/swadnerkar/Workspace/Scala/podcaster/resources"
]
swadnerkar[~/Workspace/Scala/podcaster]  (main*) $ tree resources/
resources/
└── logback.xml

1 directory, 1 file

swadnerkar[~/Workspace/Scala/podcaster]  (main*) $ cat resources/logback.xml
<configuration>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} %logger{36} %-5level -%kvp- %msg%n</pattern>
    </encoder>
  </appender>
  <root level="info">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>
7

Good to hear.

That’s still confusing. There is no podcaster dir under resources in your listings above.

8

I meant I had put the logback.xml in resources/podcaster, and when I moved it to the right location resources, I started seeing the logs.

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