@EnableAutoConfiguration
@SpringBootApplication
    class PokeVleagueApplication {

    static void main(String[] args) {
        SpringApplication.run PokeVleagueApplication, args
    }
}

application.yml

spring:
  datasource:
    url: ${JDBC_DATABASE_URL}
    username: ${JDBC_DATABASE_USERNAME}
    password: ${JDBC_DATABASE_PASSWORD}
  jpa:
    show-sql: true
    hibernate:
      ddl-auto: create

@RequestMapping(value="/pokemon", produces = "application/json")
    @ResponseBody
    String getExistingPoke() {
        return "Hello World!"
    }
}