classpathentry for lazy val project

Question

in defining service description in lagom documents, I have defined a service as follow:

lazy val userApi = project("user-api")
    .settings(
    version := "1.0-SNAPSHOT",
    libraryDependencies += lagomJavadslApi
    )
lazy val userImpl = project("user-impl")
    .enablePlugins(LagomJava)
    .settings(
        version := "1.0-SNAPSHOT",
        libraryDependencies ++= Seq(
        lagomJavadslPersistence,
        lagomJavadslTestKit
        )
    )
.settings(lagomForkedTestSettings: _*)
.dependsOn(userApi)

but on build with activator or sbt the directory structure user-api/src/main/java or user-impl/src/main/java is not getting created.