Spring4 whats up doc?

Subtitle Text
Author
Contact info

David Gómez
@dgomezg

Spring 4 core improvements
Generics in Qualifiers
Exposing attributes in Meta-annotations
Autowiring Lists and Arrays
@Description on @Configuration classes
@Conditional (user-defined @Profiles)
Time Zone support on Locale Context

En Spring 3.2….
public interface MessageService {

!
!

public String getMessage();

}
public class GeneralWaver
implements MessageService{

@Override
public String getMessage() {
return "Hello world!";
}

public class PersonWaver

implements MessageService {

!

!

!

}

@Autowired
public PersonRepository personRepository;
@Override
...
}

}
public class MultiMessagePrinter {

!

!

!

}

//All Message Services are injected
@Autowired
private List<MessageService> messageServices;
public void printMessage() {
for (MessageService messageService: messageServices) {
System.out.println(messageService.getMessage());
}
}

En Spring 3.2….
<?xml version="1.0" encoding="UTF-8"?>
<beans ...>

!
!

!
!

<context:annotation-config/>

<jdbc:embedded-database id="dataSource">
<jdbc:script location="classpath:sql/schema.ddl"/>
<jdbc:script location="classpath:sql/data.sql"/>
</jdbc:embedded-database>
<bean id=“personRepository"

class="com.autentia.playground.spring4.helloWorld.db.JdbcPersonRepository"/>

<bean id="personWaver" class="com.autentia.playground.spring4.helloWorld.messages.PersonWaver"/>
<bean id="generalWaver" class="com.autentia.playground.spring4.helloWorld.messages.GeneralWaver"/>


<bean id="messagePrinter"
class="com.autentia.playground.spring4.helloWorld.messages.MultiMessagePrinter"/>

!

</beans>

En Spring 4 also….
public interface MessageService<T> {

!
!

public T getMessage();

}
implements MessageService<String>{

@Override
}


implements MessageService<Person> {

!

!

!

}

@Autowired
@Override
public Person getMessage() {
...
}

}

!
!
!

}

@Autowired
private MessageService<Person> messageServices;
System.out.println(messageService.getMessage().toString());
}

Autowiring ordered Lists and Arrays
In Spring 3.2….

!
!


}
implements MessageService{

@Override
}



!

!

!

}

@Autowired
@Override
...
}

}

!

!

!

}

@Autowired
}
Hello Sr. David Gomez G.
}
Hello world!

Autowiring ordered Lists and Arrays
In Spring 4….

!
!


public class GeneralWaver }
implements MessageService, Ordered {

!

!

!

}

@Override
}
@Override
public int getOrder() {
return Integer.MIN_VALUE;
}

!

!

!

}



!

!

@Autowired
@Override
public int getOrder() {
return 0;
}

}

@Autowired
}
Hello world!
}

Hello Sr. David Gomez G.

In Spring 3.2….
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface Service {
String[] value();
}

@Service
@Transactional(timeout=60)
public @interface MyTransactionalService {
String[] value();
}

@MyTransactionalService


!

!

}

@Autowired
@Override
...
}

In Spring 4….
@Service
@Transactional
public @interface MyTransactionalService {
String[] value();
Propagation propagation() default Propagation.REQUIRED;
int timeout() default TransactionDefinition.TIMEOUT_DEFAULT;

!

}

@MyTransactionalService(propagation=Propagation.REQUIRES_NEW)


!

!

}

@Autowired
@Override
...
}

@Description on @Configuration classes
In Spring 4….
@Configuration
@ComponentScan
public class Application {

!

@Bean
@Description("This is a mock implementation of MockService")
MessageService mockMessageService() {
return new MessageService() {
@Override
}
};
}

}

Useful when beans are exposed, !
for example, as JMX beans

@Profiles and @Conditional
In Spring 3.2….

!

<beans profile="dev">
<jdbc:embedded-database id="dataSource">
<jdbc:script location="classpath:sql/schema.ddl"/>
<jdbc:script location="classpath:sql/data.sql"/>
</jdbc:embedded-database>
</beans>
<beans profile="prod">
<jee:jndi-lookup id="dataSource" jndi-name="jdbc/LiveDataSource"/>
</beans>
-Dspring.profiles.active=“dev"

@Configuration
@ComponentScan
@Profile(“test”)

!

}

@Bean
@Description("This is a mock implementation of MockService")
@Override
}
};
}

@Profiles and @Conditional
In Spring 4….
@Configuration
@ComponentScan

!

@Bean
@Description("This is a mock implementation of MockService”)
@Conditional(NoMessageServiceDefined.class)
@Override
}
};
}

}

!

public class NoMessageServiceDefined implements Condition {

!

}

@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
return context.getBeanFactory().getBeansOfType(MessageService.class)

.isEmpty();
}

Spring 4 web improvements
Support for Servlet 3.0
(Servlet 2.5 still supported for GAE compatibility)
(servlet 3.0 jar needed for SPRING MVC Tests)
@RestController (@RequestMapping + @ResponseBody)
@AsyncRestTemplate (Non-blocking REST clients)
!

@RestController
In Spring 3.2….
@Controller
public class WaverController {

!

!

!

}

@RequestMapping("/person")
public @ResponseBody Person showPersonalMessage() {
return personWaver.getMessage();
}
@RequestMapping("/message")
public @ResponseBody String showMessage() {
return genericWaver.getMessage();
}

@RestController
In Spring 4…
@RestController = @Controller + @ResponseBody
@RestController

!

!

!

}

public Person showPersonalMessage() {
return personWaver.getMessage();
}
@RequestMapping("/message")
public String showMessage() {
return genericWaver.getMessage();
}

RestTemplate
public class RestTemplate {

public <T> T getForObject(String url, Class<T> responseType, Object... urlVariables) {}

public <T> ResponseEntity<T> getForEntity(String url, Class<T> responseType, Object...
urlVariables) {}

public <T> T postForObject(String url, Object request, Class<T> responseType, Object...
uriVariables) {}

public void put(String url, Object request, Object... urlVariables) {}
}

public class RestTemplate {

public <T> T getForObject(String url, Class<T> responseType, Object... urlVariables) {}

public <T> ResponseEntity<T> getForEntity(String url, Class<T> responseType, Object...
urlVariables) {}

public <T> T postForObject(String url, Object request, Class<T> responseType, Object...
uriVariables) {}

public void put(String url, Object request, Object... urlVariables) {}
}

AsyncRestTemplate
public class AsyncRestTemplate {

!

public <T> ListenableFuture<ResponseEntity<T>>

getForEntity(String url, Class<T> responseType, Object... uriVariables) {}

public ListenableFuture<URI>

postForLocation(String url, HttpEntity<?> request, Object... uriVariables) {}

}

public ListenableFuture<?>

put(String url, HttpEntity<?> request, Object... uriVariables) {}

!
!

public interface ListenableFuture<T> extends Future<T> {

!

!

}

void addCallback(ListenableFutureCallback<? super T> callback);

AsyncRestTemplate
ListenableFuture<ResponseEntity<Person>> futureEntity = template.getForEntity(

"http://localhost:8080/spring4/person/{personId}", Integer.class, 1);

!

// register a callback
futureEntity.addCallback(new ListenableFutureCallback<ResponseEntity<Person>>() {
@Override
public void onSuccess(ResponseEntity<Person> entity) {
//...
}

!

});

@Override
public void onFailure(Throwable t) {
//...
}

Support for lambdas on callbacks
In Spring 3.2

public Person findById(int id) {
return jdbcTemplate.query("select * from persons where id = ?",

new RowMapper<Person>() {
@Override

public Person mapRow(ResultSet rs, int rowNum) throws SQLException {

return new Person(rs.getInt("id"),

rs.getString("treatment"),

rs.getString("name"),

rs.getString("surname"),

new Date(rs.getDate("birthDate").getTime()));

}
},

id)

.get(0);
}

In Spring 4

public Person findById(int id) {
return jdbcTemplate.queryForObject(
"select * from persons where id = ?",
(rs, rowNum) -> new Person(rs.getInt("id"),
rs.getString("treatment"),
rs.getString("name"),
rs.getString("surname"),
new Date(rs.getDate("birthDate").getTime())),
id);
}

In Spring 4

@Override
@Transactional
public Person getMessage() {
final Person person;

!

!
}

txTemplate.execute((txStatus) -> {
person = messageRepository.findById(1);
txStatus.setRollbackOnly();
return null;
});
return person;

JSR-310
package java.time
Distinction between Computer-times and Human-Times
Human-Times
TimeZone (ISO-8601)
LocalDateTime
LocalDate
LocalTime

JSR-310
package java.time
Amounts of Time
Duration (nanosecond resolution)
Amounts of Days
Period (years, months, and days)
TimeZones
ZonedDateTime
OffsetDateTime

JSR-310 in Spring 4
In web handler Methods 
import java.time.Clock;
import java.time.ZoneId;

!

@RestController

!

!

}

public Person showPersonalMessage(ZoneId zoneId) {

Clock clock = Clock.of(zoneId)

LocalTime time = LocalTime.now(clock);
return personWaver.getMessageFor(time);
}

External Libraries Support
Hibernate 3.6+
Hibernate 4.3 (JPA 2.1)
EhCache 2.1
Quartz 1.8
JodaTime 2.0
Hibernate Validator 4.3 (Bean Validation 1.1)
Jackson 2.0 (1.8/1.9 deprecated)

Support for JEE7 (& JEE6)
Serlvet 3.0
JMS 2.0
JTA 1.2
JPA 2.1
Bean Validation 1.1
JSR-236 Concurrency (ThreadExecutors)

WebSocket Support
WebSocket server support via JSR-356 runtimes
(Tomcat 7.0.7 -Jetty 9)
Fallback option using SockJS
(SockJsHttpRequestHandler)

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(de momento)

Subtitle Text
Author
Contact info

David Gómez
@dgomezg

Spring4 whats up doc?

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