[JAVA] Run Scala applications with Spring Boot through Gradle

This person's article Make a note of the result of the trial. The language is Scala, but it might be useful when you want to use Spring Boot.


  1. Add build.gradle
  2. Create a Scala object to start Spring Boot
  3. Create a Scala object for the Spring Boot controller

Add build.gradle


// Scala
apply plugin: 'scala'

dependencies {
    compile 'org.scala-lang:scala-library:2.12.6'

Creating a Scala object to start Spring Boot

Product code


package hello

import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication

class ApplicationScala {}

object ApplicationScala {

  def main(args: Array[String]): Unit = SpringApplication.run(classOf[ApplicationScala], args: _*)


Test code

I'm still not sure if the test code will cover the main function that launches Spring Boot.

Creating a Scala object for the Spring Boot controller

Product code


package hello

import org.springframework.web.bind.annotation.{RequestMapping, RequestMethod, RestController}

class ScalaController {

  @RequestMapping(method = Array(RequestMethod.GET))
  def sample = "sample from scala."


Test code

Using Spring Boot annotations, check the validity of the response as the result of API execution through URL mapping, not just the return value of the method.


package hello

import org.hamcrest.Matchers.equalTo
import org.springframework.test.web.servlet.result.MockMvcResultMatchers.content
import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status

import org.junit.Test
import org.junit.runner.RunWith
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.http.MediaType
import org.springframework.test.context.junit4.SpringRunner
import org.springframework.test.web.servlet.MockMvc
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders

class ScalaControllerTest {

  val mvc: MockMvc = null

  def sampleGet_Ok(): Unit =
      .andExpect(content.string(equalTo("sample from scala.")))

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