Maven dependency

Add the OfficeFloor Scala support alongside the Spring Boot starter:

		<dependency>
			<groupId>net.officefloor.scala</groupId>
			<artifactId>officescala</artifactId>
		</dependency>

Application class

Register DefaultScalaModule as a Spring bean so that Jackson can serialise and deserialise Scala classes in @RequestBody and ObjectResponse:

@SpringBootApplication
class Application {
  @Bean
  def scalaJacksonModule(): JacksonModule = DefaultScalaModule
}

object Application extends App {
  SpringApplication.run(classOf[Application], args: _*)
}

Scala service method

The Scala object method that handles the request uses @RequestBody to receive the JSON request body and ObjectResponse to send the response:

object ScalaService {

  def service(@RequestBody request: ScalaRequest, response: ObjectResponse[ScalaResponse]): Unit = {
    response.send(new ScalaResponse(s"Hello ${request.message}"))
  }
}

REST endpoint

The YAML file routes POST '/scala' to the Scala method via the Scala procedure source. The compiled class name for a Scala object is <ObjectName>\$:

Scala:
  resource: net.officefloor.tutorial.scalahttpserver.ScalaService$
  procedure: Scala
  method: service

Scala data classes

Scala classes work directly as JSON request and response objects once DefaultScalaModule is registered:

class ScalaRequest(val message: String)

class ScalaResponse(val message: String)

Testing

@SpringBootTest
@AutoConfigureMockMvc
class ScalaHttpServerTest {

  @Autowired
  var mvc: MockMvc = _

  @Autowired
  var mapper: ObjectMapper = _

  @Test
  def service(): Unit = {
    mvc.perform(post("/scala")
        .accept(MediaType.APPLICATION_JSON)
        .contentType(MediaType.APPLICATION_JSON)
        .content(mapper.writeValueAsString(new ScalaRequest("Daniel"))))
        .andExpect(status().isOk)
        .andExpect(content().json(mapper.writeValueAsString(new ScalaResponse("Hello Daniel"))))
  }
}