How do I create an additional Kotlin SourceSet using Gradle with Kotlin DSL

Question

I want to create a test lib source set, src/tlib/kotlin that "sits between" main and test. I have this, but I'm not sure why I would use java source dir for kotlin, and I need to get it depending on my main sources

sourceSets {
   create("tlib").java.srcDir("src/tlib/kotlin")
}

update

Calebs-MBP:phg-entity calebcushing$ ./gradlew build
e: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
    class phg.entity.AbstractEntityBase, unresolved supertypes: org.springframework.data.domain.Persistable
> Task :compileTlibKotlin FAILED

close

sourceSets {
    val main by getting
    val tlib by creating {
        java {
            srcDir("src/tlib/kotlin")
            compileClasspath += main.output
            runtimeClasspath += main.output
        }
    }
    val test by getting {
        java {
            compileClasspath += tlib.output
            runtimeClasspath += tlib.output
        }
    }
}

configurations {
    val compile by getting
    val runtime by getting
    val tlibCompile by getting {
        extendsFrom(compile)
    }
    val tlibRuntime by getting {
        extendsFrom(runtime)
    }
    val testCompile by getting {
        extendsFrom(tlibCompile)
    }
    val testRuntime by getting {
        extendsFrom(tlibRuntime)
    }
}

dependencies {
    implementation("${project.group}:constant:[0.1,1.0)")
    api("javax.validation:validation-api")
    api("javax.persistence:javax.persistence-api")
    api("org.springframework.data:spring-data-commons") // has the missing dependency

This test library code shared by the test code and other modules thing has been codified by Gradle now in the java-test-fixtures plugin. — Hakanai, Aug 07 '22 at 03:53

score 11 · Accepted Answer · answered Mar 15 '19 at 15:33

A number of things are properly taken care of by the plugins, so the addition is really about configuring the sourceSet classpath and wiring configurations.

Here is a short answer showing the classpath config and one configuration extension:

sourceSets {
    val tlib by creating {
        // The kotlin plugin will by default recognise Kotlin sources in src/tlib/kotlin
        compileClasspath += sourceSets["main"].output
        runtimeClasspath += sourceSets["main"].output
    }
}

configurations {
    val tlibImplementation by getting {
        extendsFrom(configurations["implementation"])
    }
}

Newer versions of Gradle have typesafe accessors so now you can do `sourceSets.main.get().output` and `extendsFrom(configurations.implementation.get())`. — Hakanai, Aug 07 '22 at 04:07

Eugene Petrenko · Answer 2 · 2019-03-14T20:54:15.513

3

There a similar question for Groovy
How do I add a new sourceset to Gradle?


sourceSets {
  val main by getting
  val test by getting
  val tlib by creating {
    java {
      srcDir("src/tlib/kotlin")
      compileClasspath += main.output + test.output
      runtimeClasspath += main.output + test.output
    }
  }
}

configurations {
  val testCompile by getting
  val testRuntime by getting
  val tlibCompile by getting {
    extendsFrom(testCompile)
  }
  val tlibRuntime by getting {
    extendsFrom(testRuntime)
  }
}

edited Mar 14 '19 at 20:54

answered Mar 14 '19 at 20:25

Eugene Petrenko

4,874
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but how do I make it depend on main, and how do I make test depend on it? – xenoterracide Mar 14 '19 at 20:29
hmm... somehow my classpath isn't getting all of my deps, I updated the question – xenoterracide Mar 14 '19 at 22:04
make sure you do not miss transitive dependency. `implementation` dependency is not transitive, use api where needed – Eugene Petrenko Mar 14 '19 at 22:08
uh... isn't that what I have? the missing dep is pulled in with `api` – xenoterracide Mar 14 '19 at 22:09

How do I create an additional Kotlin SourceSet using Gradle with Kotlin DSL

2 Answers2