Optional Spring bean injection using a @Profile

build.sbt

name := "spring-optional-beans"

version := "0.1-SNAPSHOT"

scalaVersion := "2.11.2"

resolvers ++= Seq(
    "Sonatype Snapshots"   at "https://oss.sonatype.org/content/repositories/snapshots/",
    "Sonatype Releases"    at "http://oss.sonatype.org/content/repositories/releases",
    "Typesafe Repository"  at "http://repo.typesafe.com/typesafe/releases/"
)

unmanagedClasspath in Runtime += file(".")

libraryDependencies ++= {
    val springVersion = "4.0.3.RELEASE"
    val slf4jVersion = "1.7.7"
    Seq(
        "org.springframework"       %   "spring-core"      % springVersion,
        "org.springframework"       %   "spring-context"   % springVersion,
        "javax.inject"              %   "javax.inject"     % "1",
        "org.slf4j"                 %   "slf4j-api"        % slf4jVersion,
        "org.slf4j"                 %   "slf4j-simple"     % slf4jVersion
    )
}

mainClass := Some("OptionalSpringBeanInjection")

OptionalSpringBeanInjection.scala

import collection.JavaConversions._
import org.springframework.beans.factory.annotation._
import org.springframework.context.ApplicationContext
import org.springframework.context.annotation._
import org.springframework.stereotype._

package com.example.core {

    @ComponentScan(basePackages = Array("com.example.core"))
    @Configuration
    class CoreConfig {}

    @Service 
    class MyApplicationService {

        @Autowired(required = false) 
        val newsProvider: com.example.news.NewsProvider = null
        
        def greet(name: String): String = {
            if (newsProvider != null)
                newsProvider.headlineForToday
            else
                s"Hello, ${name}" 
        }
    }

}
    
package com.example.news {
    
    @Profile(Array("newsModule"))
    @ComponentScan(basePackages = Array("com.example.news"))
    @Configuration
    class NewsConfig {}
    
    trait NewsProvider {
        def headlineForToday: String
    }

    @Service
    class StaticNewsProvider extends NewsProvider {
        def headlineForToday: String = "Evidence of life found on Mars!"
    }

}

object OptionalSpringBeanInjection extends App {
    val ctx = new AnnotationConfigApplicationContext(classOf[com.example.core.CoreConfig], classOf[com.example.news.NewsConfig])
    val service = ctx.getBean(classOf[com.example.core.MyApplicationService])
    val result = service.greet("John Doe")

    println("*"*80)
    println(result)
    if (!sys.props.get("spring.profiles.active").getOrElse("").split(',').exists( p => p == "newsModule" )) {
        println("Run 'sbt -Dspring.profiles.active=newsModule run' to enable the \"optional\" service.")
    }
    println("*"*80)

}