Spring conference in Paris, part 3

[Updated on 2009/01/09] Videos are available here.

Part 1 & Part 2 already posted. This is the last one.

Here's the transcript of Jurgen Hoeller's presentation on Spring 3.0.

Spring 3.0 themes

• Java 5+ foundation, compatible with J2EE 1.4 and Java EE 5
  
• Spring Expression Language : Unified EL++
  
• Comprehensive REST support
  
• Declarative model validation : Hibernate Validator, JSR 303
• Portlet 2.0

Expression Language in bean definitions : dynamic expressions for property values
<bean... >
<property name = “databaseName” value=”#{systemProperties.databaseName}” />
<property name = “keyGenerator” value=”#{strategyBean.databaseKeyGenerator}” />
</bean>

Expression Language in component annotation : dynamic expressions for method parameters
@Repository
public class RewardsTestDatabase {
@Value(“#{systemProperties.databaseName}”)
public void setDatabaseName(String dbName) {... }
}

Conversation management

• Key problem : isolating concurrent windows in the same browser
  
• Shared HTTP session
• Several independend conversations going on
• Define scope with a shorter lifetime than session
• Scope = “conversation”
• Spring Web Flow will provide sophisticated flow
  navigation management on top of this

REST support : Spring MVC will provide 1st class support for REST
http://rewarddining.com/show/12345
@RequestMapping(value=”/show/{id}”, method=GET)
public Reward show(@UriVariable(“id”) long id) {
return this.rewardsAdminService.findReward(id);
}

Support for different representations

• JSON : GET http://rewarddining.com/accounts/1.json
  
• XML : GET http://rewarddining.com/accounts/1.xml
  
• ATOM : GET http://rewarddining.com/accounts/1.atom

Model validation
public class Reward {
@NotNull
@ShortDate
private Date transactionDate;
}

• In view : <form:input path=”transactionDate”>
• Description of constraints in the application itself
• Same metadata can be used for persisting, rendering, etc.
• Support for Hibernate Validator and Bean Validation (JSR 303)

Spring 2.5 mission continued

• Fully embracing Java 5
• Backward compatibility with Spring 2.5
  
• 100% compatibility of programming model
  
• 95% compatibility of extension points
• All previously deprecated API to be removed
  
• code still working
  
• documentation already removed
  
• stop using 1.2 / 2.0 API !

Roadmap

• 3.0 Milestone 1 : end of november
  
• new build system
  
• first cut of REST and Expression Language
  
• 3.0 RC1 : march 2009
  
• followed by 2 further milestones
  
• 3.0 Final : april 2009
  
• depending on RC feedback...