The document discusses Spring Boot and its capabilities for building modern applications, emphasizing quick startup, convention over configuration, and a focus on operations. It highlights features like automatic configuration, various starters for web and JPA, and the integration of tools for managing distributed systems like Spring Cloud. Additionally, it addresses configuration management and profiles, as well as critiques related to the framework's complexity and learning curve.

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Nicolas Jozwiak
Thomas Auffredou
Construire le SI de demain
Spring boot

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@tauffredou
@njozwiak

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Initié par
Phillip Webb : @phillip_web
et
Dave Syer : @david_syer

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Dernière release GA : 1.2.3
(Mars 2015)

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Se frayer un chemin dans la galaxie Spring
Objectifs

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● Démarrer rapidement
● Convention over configuration
● Orienté ops (métriques, configuration, ...)
● Pas de génération de code (contrairement à SpringRoo)
Objectifs

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Exemple Groovy
@RestController
class SampleApplication
{
@RequestMapping("/")
String home() {
"Hello World!"
}
}
$spring run app.groovy

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Présentation
● Prérequis faibles : jdk >= 1.6, maven >= 3.1, gradle >= 1.6
● Repose sur les nouveautés de Spring 4
● Orientation architecture standalone / microservices

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@EnableAutoConfiguration
● Configuration automatique de l'application
● Repose principalement sur les @Conditional

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@ConditionalOnClass
@Configuration
@ConditionalOnClass(Mongo.class)
@EnableConfigurationProperties(MongoProperties.class)
public class MongoAutoConfiguration {
/* ... */
}

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@ConditionalOnBean
@Configuration
@ConditionalOnExpression("${health.db.enabled:true}")
@ConditionalOnBean(DataSource.class)
public static class DataSourcesHealthIndicatorConfiguration {
/* ... */
}

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@ConditionalOnMissingBean
@Bean
@ConditionalOnMissingBean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter(
ObjectMapper objectMapper) {
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setObjectMapper(objectMapper);
converter.setPrettyPrint(this.properties.isJsonPrettyPrint());
return converter;
}

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@ConditionalOnExpression
@ConditionalOnExpression("${security.basic.enabled:true}")
@Configuration
@Order(SecurityProperties.BASIC_AUTH_ORDER)
protected static class ApplicationWebSecurityConfigurerAdapter extends
WebSecurityConfigurerAdapter {
/*...*/
}

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@ConditionalOnProperty
@Bean
@ConditionalOnProperty(prefix = "spring.mvc.", value = "date-format")
public Formatter<Date> dateFormatter() {
return new DateFormatter(this.mvcProperties.getDateFormat());
}

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● @ConditionalOnMissingClass
● @ConditionalOnNotWebApplication
● @ConditionalOnResource
● @ConditionalOnWebApplication

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Application.java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;
@Configuration
@EnableAutoConfiguration
@Import(RepositoryRestMvcConfiguration.class)
@EnableJpaRepositories
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

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Client.java
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Client {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
Long id;
String name;
//Getter & Setter
}

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ClientRepository.java
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
@RepositoryRestResource(collectionResourceRel = "client",path = "client")
public interface ClientRepository extends PagingAndSortingRepository<Client,Long> {
}

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Sous le capot...
● spring mvc
● jpa + hibernate
● logback
● tomcat
● spring HATEOAS

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STARTERS

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spring-boot-starter-parent
● Gère la version des starters et des dépendances sous-jacentes
● On ne définit que la version de spring boot (ex : 1.2.3.RELEASE)

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spring-boot-starter-web
Tomcat + Spring MVC + logback

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spring-boot-starter-jpa
JPA & Hibernate + Validation + TomcatConnectionPool

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spring-boot-starter-security
● basic auth
● jdbc
● oAuth
● cas
● ...
Spring security

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spring-boot-starter-actuator
● Metrics
● Health Check
● Autoconfig
● Environment information
● Pages d'erreurs par défaut
MVC endpoints + JMX support

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spring-boot-starter-test
spring-boot-starter-jetty
spring-boot-starter-mongo
...
Liste complète sur https://github.com/spring-projects/spring-boot/tree/master/
spring-boot-starters

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Gestion de configuration

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Fichiers par défaut
● application.properties
● application.yml

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Emplacements par défaut
● classpath:
● classpath:/config
● file:
● file:config/

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Surcharger la configuration

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ConfigurationProperties
@Component
@ConfigurationProperties(prefix = "my-app")
public class SampleProperties {
private String version;
private String motd = "Some default value";
// Getters & setters
}

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ConfigurationProperties
@Component
@ConfigurationProperties(prefix = "my-app")
public class SampleProperties {
private String version;
private String motd = "Some default value";
// Getters & setters
}
SampleProperties.java
application.yml
my-app :
version : 1.2.3
motd : "Un message tellement plus utile"

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ConfigurationProperties
@Service
public class SampleService {
@Inject
ClientProperties properties;
}
SampleService.java

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Avec les profiles spring
$java -jar my-app.jar --spring.profiles.active=instance1
SampleProperties.java
application-instance1.yml
#
# Override properties from application.yml for instance1
#
server :
port : 8081

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En précisant les fichiers
$java -jar my-app.jar --spring.config.location=
file:/etc/my-app/default.properties,
file:/etc/my-app/instance1.properties

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Spring Cloud

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Gestion de systèmes
distribués
● Gestion de la configuration versionnée
● Découverte et enregistrement de services
● Messages distribués
● Locks distribués
● Election de leader dans un cluster
● ...
Liste complète sur http://projects.spring.io/spring-cloud

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spring-boot-netflix
● service discovery
● circuit breaker
● load balancer côté client
● monitoring
● router et filter
● ...
Liste complète sur http://projects.spring.io/spring-cloud

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Démo
Gestion des actions

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● Tolérance à la panne
● Monitoring en temps réel
● Gestion de la concurrence

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Eureka
Découverte de services

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Let’s play

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Critiques

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● Beaucoup de magies
● Obligation de surcharger
● Pratiquement plus de XML
● Même courbe d’apprentissage que Spring

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https://github.com/xebia-france/backday-
spring-boot-server