public interface JokeRetriever {
    String getJoke();
}

@Service
public class RestJokeRetriever implements 
JokeRetriever {
    private final RestTemplate restTemplate;
    public RestJokeRetriever(RestTemplate restTemplate)
    { this.restTemplate = restTemplate; }

    @Override
    public String getJoke() {
        String url = "http://api.icndb.com/jokes/random";
        ResponseEntity<String> response = 
        restTemplate.getForEntity(url, String.class);
        return response.getBody();
    }
}

@SpringBootApplication
@Configuration
public class JokesApplication {

   // ...
   @Bean
   public RestTemplate restTemplate() {
		return new RestTemplate();
   }

}

@RunWith(SpringRunner.class)
@SpringBootTest(classes = JokesApplication.class)
public class RestJokeRetrieverTest {
    @Autowired
    JokeRetriever jokeRetriever;

    @Test
    public void joke() {
        String jokeText = jokeRetriever.getJoke()
        .value.getJoke();
        Assert.assertFalse(jokeText.isEmpty());
        Assert.assertTrue(jokeText.contains(
        				"Chuck Norris"));
    }
}

dependencies {
    // ...
	implementation
       'org.springframework.shell:spring-shell-starter:2.0.0.RELEASE'
    // ...
}

@ShellComponent
public class ShellCommands {
    private final JokeRetriever jokeService;
    private String lastJoke;

    @ShellMethod("Get joke about Chuck Norris.")
    public String joke() {
        lastJoke = jokeService.getJoke().value.getJoke();
        return lastJoke;
    } 
}

shell:>joke
Chuck Norris hosting is 101% uptime guaranteed.
shell:>joke
Product Owners never ask Chuck Norris for more features.
They ask for mercy.

@RunWith(SpringRunner.class)
@SpringBootTest(
    classes = JokesApplication.class,
    properties = {
       InteractiveShellApplicationRunner
         .SPRING_SHELL_INTERACTIVE_ENABLED + "=false",
       ScriptShellApplicationRunner
         .SPRING_SHELL_SCRIPT_ENABLED + "=false"
    }
)
public class RestJokeRetrieverTest {

org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\
org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\

@Configuration
@ConditionalOnClass(ObjectMapper.class)
public class JacksonAutoConfiguration {
	@Bean
	public JsonComponentModule jsonComponentModule() {
		return new JsonComponentModule();
	}

java -jar jokes.jar --debug

============================
CONDITIONS EVALUATION REPORT
============================


Positive matches:
-----------------

 CodecsAutoConfiguration.JacksonCodecConfiguration matched:
   - @ConditionalOnClass found required class 
   'com.fasterxml.jackson.databind.ObjectMapper' (OnClassCondition)

@Override
public void save(String jokeText) {
    jdbcTemplate.update(
    "insert into jokes (joke) values (?)"
    , jokeText);
}

@Override
public List<String> getAll() {
    return jdbcTemplate.query(
     "select joke from jokes",
      (rs, rowNum) -> rs.getString("joke"));
}

# путь к файлу
spring.datasource.url=jdbc:h2:file:./data/jokes
spring.datasource.driverClassName=org.h2.Driver
# логин
spring.datasource.username=sa
# пароль
spring.datasource.password=
# веб консоль
spring.h2.console.enabled=true

// используйте метод exchange RestTemplate. 
// на входу ему нужна RequestEntity, которую можно создать
// указав в конструкторе HTTP заголовки, HTTP метод и URI

// Заголовки создайте так:
MultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
headers.add(HEADER_NAME, HEADER_VALUE);

// URI
String url = "http://example.com";
URI.create(url);

@ShellMethod("Get joke about Chuck Norris.")
public String joke(
    @ShellOption(defaultValue = "NERDY") 
        String category) {
    lastJoke = jokeService.getJoke(category).value.getJoke();
    return lastJoke;
}