无法从 Scala Spring Boot 应用程序读取 application.properties

Question

First time trying to land a Spring project in Scala but I'm finding some issues when it comes to things that seemed straightforward in Java.

This is my current context, an object and a class.

object Sample {
  def main(args: Array[String]): Unit = { // launch this class via console to execute

    SpringApplication.run(classOf[SampleImpl], args: _*)

    new SampleImpl().doSomething()
  }
}

And then the SampleImpl class which contains all the logic.

@SpringBootApplication
class SampleImpl extends Serializable {

  @Value("${myValue}")
  val myValue: String = null

  def doSomething(): Unit = {
    print(myValue) // will always print null, should print "sample"
  }

}

File application.properties does contain the myValue=sample property and the file is detected since if I change the @Value placeholder to something not present in the file, it will complain and won't execute.

Sure has to be related with me instantiating the class and maybe creating another parallel context instead of using the true bean?

EDIT

Also tried with the following approach, leaving SampleImpl all the big stuff and Sample as the one running the method and params. Still no luck retrieving the value so far.

@SpringBootApplication
@Configuration
class SampleImpl extends Serializable {

  @BeanProperty
  @Value("${myValue}")
  var myValue: String = _

  def doSomething(args: Array[String]): Unit = {
    SpringApplication.run(classOf[SampleImpl], args: _*)
    print(myValue) // will always print null, should print "sample"
  }

}

Answer 1

Try to initialise the value with empty rather than null. something like

@Value("${myValue}")
val myValue: String = ""