1. Spring Framework 3.0
Alef Arendsen
Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

2. Agenda
• Configuration options in 1.0, 2.0, 2.5 and 3.0
• Introduction of REST support in Spring MVC
• Migration of OXM from WS to Spring Framework
• Introduction of expression language support
• Other features and considerations for Spring 3.0
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

3. Agenda
• Configuration options in 1.0, 2.0, 2.5 and 3.0
• Introduction of REST support in Spring MVC
• Migration of OXM from WS to Spring Framework
• Introduction of expression language support
• Other features and considerations for Spring 3.0
3
Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

4. Spring 1.0 <beans/> schema
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<beans xmlns=quot;http://www.springframework.org/schema/beansquot;
xmlns:xsi=quot;http://www.w3.org/2001/XMLSchema-instancequot;
xsi:schemaLocation=quot;...quot;>
<bean id=quot;clinicquot;
class=quot;org.springframework.samples.petclinic.JdbcClinicquot;>
<constructor-arg ref=quot;dataSourcequot;/>
</bean>
</beans>
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5. Spring 2.0 schema support
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<beans xmlns=quot;http://www.springframework.org/schema/beansquot;
xmlns:xsi=quot;http://www.w3.org/2001/XMLSchema-instancequot;
xmlns:tx=quot;http://www.springframework.org/schema/txquot;
xsi:schemaLocation=quot;...quot;>
<tx:annotation-driven
base-package=quot;org.springframework.samples.petclinicquot;/>
</beans>
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6. Spring 2.5 annotations
@Transactional @Repository
public class HibernateClinic implements Clinic {
private SessionFactory sessionFactory;
@Autowired public HibernateClinic(
SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
}
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7. Component scanning
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<beans xmlns=quot;http://www.springframework.org/schema/beansquot;
xmlns:xsi=quot;http://www.w3.org/2001/XMLSchema-instancequot;
xmlns:context=quot;http://www.springframework.org/schema/contextquot;
xsi:schemaLocation=quot;...quot;>
<context:component-scan
base-package=quot;org.springframework.samples.petclinicquot;/>
</beans>
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8. @Controller for Spring MVC
@Controller
public class ClinicController {
private final Clinic clinic;
@Autowired public ClinicController(Clinic clinic)
{
this.clinic = clinic;
}
...
}
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9. @RequestMapping methods
@Controller
public class ClinicController {
...
@RequestMapping(quot;/vetsquot;)
public List<Vet> vets() {
return clinic.getVets();
}
}
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10. Constantly simplifying
• LoC for sample application PetClinic over
time
Spring 2.0 Spring 2.5
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11. Spring as a foundation
• Other technologies building on the Spring
foundation
•Spring Batch 2.0 (e.g. with @BatchComponent)
•Spring Integration 1.0 (e.g. with @MessageEndpoint)
•Spring Web Services (e.g. with @Endpoint)
•...
• Most projects feature annotation-based
options as well as XML-based ones
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12. Other portfolio example:
Spring Integration 1.0 - dec08
• Relatively new project under the Spring
Portfolio umbrella
• Focuses on in-VM lightweight integration
scenarios
–asynchronous messaging in a single VM
–with adapters for many formats to integrate
with external systems
(JMS, Email, File, et cetera)
• Implement of the Patterns of Enterprise
Application Integration (Hohpe et. al.)
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13. @MessageEndpoint
@MessageEndpoint
public class OrderSplitter {
@Splitter(inputChannel=quot;ordersquot;,
outputChannel=quot;drinksquot;)
public List<OrderItem> split(Order order) {
return order.getItems();
}
}
13
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14. @MessageEndpoint
<si:splitter input-channel=quot;ordersquot;
output-channel=quot;drinksquot;
ref=quot;orderSplitterquot; method=quot;splitquot; />
<bean id=quot;orderSplitterquot;
class=quot;org.sfw.integration..xml.OrderSplitterquot;/>
Look ma,
no annotations!
public class OrderSplitter {
public List<OrderItem> split(Order order) {
return order.getItems();
}
}
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15. New in Spring 3.0
• Previously available in a separate project
(Spring JavaConfig)
• Has been available in prototype form since
early 2005
• Now promoted to the core
Spring Framework
15
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16. Spring 1.0 <beans/> schema
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<beans xmlns=quot;http://www.springframework.org/schema/beansquot;
xmlns:xsi=quot;http://www.w3.org/2001/XMLSchema-instancequot;
xsi:schemaLocation=quot;...quot;>
<bean id=quot;clinicquot;
class=quot;org.springframework.samples.petclinic.JdbcClinicquot;>
<constructor-arg ref=quot;dataSourcequot;/>
</bean>
</beans>
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17. JavaConfig in Action
@Configuration
public abstract class MyConfig {
@Bean public Clinic clinic() {
DataSource ds = dataSource();
return new JdbcClinic(ds);
} One method
per bean
@Autowired public abstract DataSource dataSource();
}
17
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18. Agenda
• Configuration options in 1.0, 2.0, 2.5 and 3.0
• Introduction of REST support in Spring MVC
• Migration of OXM from WS to Spring Framework
• Introduction of expression language support
• Other features and considerations for Spring 3.0
18
Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

19. Summary of REST
• (Ideally) stateless server architecture
• Resources
• Actions / operations on those resources
• Representations
19
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20. A practical example
• http://bank.com/account/1234
• Represents the account resources
–GET retrieves the account
•GET to bank.com/account/1234 to retrieve
–PUT creates or modifies a resource
•Post to bank.com/account/1234 to create/update
–POST creates a resource
•Post to bank.com/account to create a new account
–DELETE deletes a resources
•DELETE to bank.com/account/1234 to delete or for
example deactiveate / cancel
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21. Summary of Spring REST
• URI template support (client & controller)
• Support for representations
(HTML, XML, RSS, Atom, PDF, Excel, JSON)
• Servlet Filter to PUT/DELETE support
• Built on Spring MVC
21
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22. Support for URI templates
@Controller
@RequestMapping(quot;/account/*quot;)
public class AccountController {
@RequestMapping(value=quot;/*/{id}quot;,
method=RequestMethod.GET)
public Account get(@PathVariable long id) {
// retrieve and return account
}
}
Handles URL: http://bank.com/account/1234
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23. Representations
• Neatly laid-out support for several
representations of your data:
–HTML (e.g. through FreeMarker or JSPs)
–PDF and Excel (POI, JExcelApi, iText)
–JSON, RSS, Atom
–XML
• Support for changing the representation
based on extension or the accept-header
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24. Support for PUT and DELETE
• Most browsers don’t support PUT / DELETE
• So what about the following:
@RequestMapping(value=quot;/*/{id}quot;,
method=RequestMethod.DELETE)
public void delete(@PathVariable long id) {
// delete account
}
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

25. Support for PUT and DELETE
• Most browsers don’t support PUT / DELETE
• So what about the following:
@RequestMapping(value=quot;/*/{id}quot;,
method=RequestMethod.DELETE)
public void delete(@PathVariable long id) {
// delete account
}
• Support for PUT and DELETE is added
through a special ServletFilter (and in
HTML for example using a hidden
input field)
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

26. Agenda
• Recap of Spring 2.5 configuration options and
@MVC
• Introduction of REST support in Spring MVC
• Migration of OXM to Spring Framework
• Introduction of expression language support
• Other features and considerations for Spring 3.0
26
Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

27. Object-XML mapping
abstraction in Spring
• Mapping objects to XML and vice versa through
–XmlBeans, JiBX, Castor, JAXB (2), XStream
• Used to be part of Spring WS
• Useful for REST purposes as well
• Moved to core Spring Framework as of 3.0
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28. Interfaces for marshalling and
unmarshalling
public interface Marshaller {
public void marshal(Object graph, Result result)
throws XmlMappingException, IOException;
}
public interface Unmarshaller {
public Object unmarshal(Source source)
throws XmlMappingException, IOException;
}
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

29. Usages throughout portfolio
• JMS (MarshallingMessageConverter
• MVC (MarshallingView)
• Batch
• ...
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

30. Agenda
• Recap of Spring 2.5 configuration options and
@MVC
• Introduction of REST support in Spring MVC
• Migration of OXM from WS to Spring Framework
• Introduction of expression language support
• Other features and considerations for Spring 3.0
30
Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

31. Property externalization in 2.5
• Traditionally using
<bean id=quot;dataSourcequot;
class=quot;org.apache.commons.dbcp.BasicDataSourcequot;
destroy-method=quot;closequot;>
<property name=quot;driverClassNamequot; value=quot;${driver}quot;/>
<property name=quot;urlquot; value=quot;${url}quot;/>
<property name=quot;usernanequot; value=quot;${username}quot;/>
<property name=quot;passwordquot; value=quot;${passwordquot;/>
</bean>
<context:property-placeholder
location=quot;/WEB-INF/jdbc.propertiesquot;/>
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32. Drawbacks of this approach
• It only supports properties
• The replacement is done at initialization
time
»Not at bean creation time
• It doesn’t support conditionals or other
constructs
• It’s not very extensible for other
frameworks
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

33. Introducing expressions
• Spring 3.0 will include full support for the
unified expression language
• The replacement is done when the bean is
created (and not when reading the
configuration)
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

34. Introducing expressions
• Spring 3.0 will include full support for the
unified expression language
• The replacement is done when the bean is
created (and not when reading the
configuration)
<bean id=quot;dataSourcequot;
class=quot;org.apache.commons.dbcp.BasicDataSourcequot;
destroy-method=quot;closequot; scope=”prototype”>
...
<property name=quot;urlquot; value=quot;${systemProperties.url}quot;/>
</bean>
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

35. Using expressions in other
parts of the portfolio
• An extensible expression language
• Will be used by other frameworks
–Security (example below)
–Integration / JMS (e.g. dynamic queue names)
–Et cetera
@PreAuthorize(quot;hasRole('ROLE_SUPERVISOR') or quot; +
quot;hasRole('ROLE_TELLER') and quot; +
quot;(#account.balance + #amount >= -#account.overdraft)quot; )
public void post(Account account, double amount);
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Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

36. Agenda
• Recap of Spring 2.5 configuration options and @MVC
• Introduction of REST support in Spring MVC
• Migration of OXM from WS to Spring Framework
• Introduction of expression language support
• Other features and considerations for Spring 3.0
36
Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

37. Backwards compatibility
• Spring 3.0 will deprecate / remove various
things
•Traditional Spring MVC controller hierarchy (??)
•Commons Attributes support
•Traditional TopLink support
•Traditional JUnit 3.8 class hierarchy
• 95% backwards compatible with regards to
APIs
• 99% backwards compatible in the
programming model
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38. Roadmap
• Spring 3.0 M1 released in December
• Spring 3.0 M2 to be released any time now
• Further Milestones later this quarter
• Spring 3.0 RC and release Q2 2009
• More information on what features are
included in which milestones:
http://jira.springframework.org
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39. Questions?
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