Scala多模块项目？

Question

• I have Java background and thinking of learning Scala .
• One of this things that I like about using Maven is that I can make a project as multi-maven module. Example?

 Project/pom.xml /persistence/pom.xml /business/pom.xml /services/pom.xml 

The nice thing about it is that each of these modules can have their own dependencies and they can be tested independently, rather than running one monolith application.

How do we achieve something similar in Scala , sbt or its ecosystem?

Answer 1

You can definitely do it. It's called SBT Multi-Project build . You can define one master project and multiple child projects with something like this (from the docs link above):

import sbt._
import Keys._

object HelloBuild extends Build {
    lazy val root = Project(id = "hello",
                            base = file(".")) aggregate(foo, bar)

    lazy val foo = Project(id = "hello-foo",
                           base = file("foo"))

    lazy val bar = Project(id = "hello-bar",
                           base = file("bar"))
}

Each project can be built separately, you can also package each into a separate JAR, or combine them all into a single master JAR. Each project can define it's own dependencies, but they can also be shared if needed. Basically you have full control. Take a look at my project build file here for example.