Spring - how to inject components from another module into a SpringBoot application

Question

In my project I have two modules:

• com.demo.shared
• com.demo.app

In com.demo.shared I have a component

@Component
class Address(
    @Value("\${config.address.host}") val host: String,
    @Value("\${config.address.port}") val port: Int
)

In com.demo.app I want to have Spring's IoC container inject the component

@SpringBootApplication
class Application(address: Address) {
    companion object {
        @JvmStatic
        fun main(args: Array<String>) {
            SpringApplication.run(Application::class.java, *args)
        }
    }

    private val client: HttpClient("http://${address.host}:${address.port}/")
}

When I run the application I get this error:

Parameter 0 of constructor in com.demo.app.Application required a bean of type 'com.demo.shared.Address' that could not be found.

What am I missing?

NOTE: I've tagged Java because, even though the modules are using Kotlin, if anyone can provide Java examples of what to do, I'll be able to port it relatively easily.

Answer 1

It looks like you just need to add a component scan annotation: http://www.springboottutorial.com/spring-boot-and-component-scan

@ComponentScan(“com.in28minutes.springboot”)