scala multi sbt 项目：对象不是包的成员，未找到类型

Question

如何abc从项目中导入类main以供配置中项目web中的另一个类使用multi-project sbt？

当sbt compile我得到：
object abc is not a member of package com not found: type abc

虽然从 IntelliJ 内部编译成功。

生成.sbt

lazy val main = project.in(file("main"))
  .settings(commonSettings: _*)

lazy val web = project.in(file("web"))
  .settings(commonSettings: _*)
  .enablePlugins(PlayScala)
  .dependsOn(main)

lazy val root = (project in file("."))
  .dependsOn(web, main)
  .aggregate(web, main)
  .settings(commonSettings: _*)


mainClass in root in Compile := (mainClass in web in Compile).value

fullClasspath in web in Runtime ++= (fullClasspath in main in Runtime).value

fullClasspath in root in Runtime ++= (fullClasspath in web in Runtime).value

内部网络项目：

package com.company.web.controllers
import _root_.com.company.main.abc // also tried without root. 
// Intellij recognizes the import successuflly

class Posts @Inject() (repo : abc) extends Controller { ..

内部主要项目：

package com.company.main
class abc @Inject() (){

可能有什么问题？谢谢。

Answer 1

原来项目的目录结构main不符合maven目录结构，如此处所述

src/
  main/
    scala/
       com/bla/bla
  test/
    scala/
       <test Scala sources

Intellij 成功编译了该项目，因为无论旧的目录结构是什么，它都被标记source directory为File -> project structure -> modules -> sources