Whitelabel Error Page

Hello, I'm trying to make a spring boot application with mysql database access using JdbcTemplate and when I try to access the database via url I always get the error:

Whitelabel Error Page
This application has no explicit mapping for / error, so you are seeing this as a fallback. Mon Dec 19 12:32:45 EST 2016 There was an unexpected error (type = Not Found, status = 404). No message available

OfficialClass

publicclassFuncionarioimplementsSerializable{privatestaticfinallongserialVersionUID=1L;privateIntegercodigo;privateStringnome;privateStringcargo;privateIntegeridade;privateDepartamentodepartamento;publicFuncionario(){super();}//getteresettersomitidos

Challenge2Application.java

@SpringBootApplicationpublicclassDesafio2Application{publicstaticvoidmain(String[]args){SpringApplication.run(Desafio2Application.class,args);}}

ServletInitializer

publicclassServletInitializerextendsSpringBootServletInitializer{@OverrideprotectedSpringApplicationBuilderconfigure(SpringApplicationBuilderapplication){returnapplication.sources(Desafio2Application.class);}}

OfficialDaoImpl

@RepositorypublicclassFuncionarioDaoImplimplementsFuncionarioDao{@AutowiredprivateJdbcTemplateJdbcTemplate;@OverridepublicList<Map<String,Object>>findAll(){returnJdbcTemplate.queryForList("select * from Funcionario");
}
}

OfficialController

@RestController
public class FuncionarioController {
@Autowired
FuncionarioService funcionarioService;

@RequestMapping("/funcionarios")
public List<Map<String, Object>> findAll(){
    return funcionarioService.findAll();
}
}

OfficialServiceImpl

@Service
public class FuncionarioServiceImpl implements FuncionarioService{

@Autowired
private FuncionarioDao funcionarioDao;

@Override
public List<Map<String, Object>> findAll() {
    return this.funcionarioDao.findAll();
}
}

I'm starting now with Spring and I do not have much expirience ... I already looked for some solutions but I could not solve the problem that is to show on the screen via url to list of officials .. Thanks in advance.