CreateUser.groovy

@Component
@Log4j
@CompileStatic
class CreateUser implements Handler {

  @Autowired
  private UserRepository userRepository

  @Override
  boolean route(Request request) {
    request.resourcePath() == '/users/create' && request.httpMethod() == 'POST'
  }

  @Override
  Response respond(final Request request) {
    def firstName = request.queryString('firstName')
    def lastName = request.queryString('lastName')
    def user = new User(firstName, lastName)
    userRepository.save(user)
    Response.builder()
        .statusCode(201)
        .body(JsonOutput.prettyPrint(JsonOutput.toJson(user)))
        .build()
  }
}