Spring Framework 3.0
The Next Generation
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About SpringSource
· Employs all committers for Spring · Committers for Tomcat, ActiveMQ, Apache HTTP · New: tc Server / dm Server · Groovy / Grails (acquisition of G2One) · Training · Consulting · Subscription / Support
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About me
· Regional Director German speaking region and Principal Consultant · Author of several articles and books · First German Spring book · Speaker at national and international conferences · Blog: http://jandiandme.blogspot.com/ · Eberhard.Wolff@springsource.com
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Agenda
· A Brief History of Spring · A Quick Review: Spring 2.5 · Spring 3.0 Themes and Features · Spring 3.0 Roadmap
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A Brief History of Spring
· Spring is the most popular Java / J2EE application framework
POJOs + AOP + service abstractions
· trademark: the tag · integration with popular persistence solutions etc
JDK 1.3+, J2EE 1.2+
· supporting any application server in the market · also able to run standalone
'Traditional' versions: Spring 1.2, Spring 2.0
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Typical Spring XML Configuration
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Spring & Runtime Platforms
· Spring's central value proposition
providing a unified programming model for business components providing consistent configuration across different runtime environments
· Foundation: plain Java objects
transparently integrating with environment services through Spring's generic container rich annotation support on Java 5
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Spring: Portability
· J2EE provides standard system services · Spring abstractions can run on top of J2EE · ..or OSGi, Tomcat, ...
Application components (POJOs) Spring application container Spring service abstractions
J2EE
OSGi
Tomcat
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Spring Framework 2.5
· Comprehensive support for annotation-based configuration
@Autowired (+ @Qualifier or custom qualifiers) @Transactional @Service, @Repository, @Controller
· Common Java EE 5 annotations supported too
@PostConstruct, @PreDestroy @PersistenceContext, @PersistenceUnit @Resource, @EJB, @WebServiceRef @TransactionAttribute
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Annotated Bean Component
@Service public class RewardNetworkService implements RewardNetwork {
Makes this class a Spring Bean
Inject type compatible Spring Bean @Autowired public RewardNetworkService(AccountRepository ar) { ... }
@Transactional public RewardConfirmation rewardAccountFor(Dining d) { ... }
Do transactions
}
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Annotated DAO with Lifecycle
Makes this class a Spring Bean Apply exception translation
@Repository public class JdbcAccountRepository implements AccountRepository {
Inject type compatible Spring Bean @Autowired public JdbcAccountRepository(DataSource ds) { ... }
@PostConstruct Initialization after injection public initCache() { ... } @PreDestroy Clean up public cleanupCache() { ... } }
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Minimal XML Bootstrapping
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Test Context Framework
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration public class RewardSystemIntegrationTests { @Autowired private RewardNetwork rewardNetwork; @Test @Transactional public void testRewardAccountForDining() { // test in transaction with auto-rollback }
}
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Spring Servlet MVC 2.5
@Controller public class MyController { private final MyService myService; @Autowired public MyController(MyService myService) { this.myService = myService; } @RequestMapping("/removeBook") public String removeBook(@RequestParam("book") String bookId) { this.myService.deleteBook(bookId); return "redirect:myBooks"; }
}
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Spring 3.0
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Status
· Currently in 3.0M1 · Planned: M2, M3, RC1, release · So this is an early look at what's coming
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Spring 3.0 Themes
· Comprehensive REST support · Spring Expression Language · Support for Portlet 2.0
JSR-303 Bean Validation JSF 2.0, JPA 2.0, etc Unified EL++ action/event/resource request mappings and other Spring @MVC additions
· Declarative model validation · Early support for Java EE 6 · Java 5+ foundation
compatible with J2EE 1.4 and Java EE 5
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REST
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REST
· Representational State Transfer · Simple and natural architectural pattern for web applications · Unified approach for HTML, XML, JSON
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REST example
Create a reward POST/PUT http://rewarddining.com/reward/ Get reward GET http://rewarddining.com/reward/1234 Get reward as XML GET http://rewarddining.com/reward/1234 accepts application/xml GET http://rewarddining.com/reward/1234.xml Change data POST http://rewarddining.com/reward/1234 Delete reward DELETE http://rewarddining.com/reward/1234
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REST advantages
· Simple
Have you taken a look at Web Service standards lately? Simple usage allows better interoperability
· Unified approach for HTML / XML ... · Builds on the strength of the Web
Ressources are globally adressable
· Natural use of HTTP
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REST Support in Spring 3.0
· Spring MVC to provide first-class support for REST-style mappings
extraction of URI template parameters content negotiation in view resolver
· Goal: native REST support within Spring MVC, for UI as well as non-UI usage
in natural MVC style
· Alternative: using JAX-RS through integrated JAX-RS provider (e.g. Jersey)
using the JAX-RS component model to build programmatic resource endpoints
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REST in MVC - @PathVariable
GET http://rewarddining.com/reward/12345
@RequestMapping(value = "/rewards/{id}", method = GET) public Reward reward(@PathVariable("id") long id) { return this.rewardsAdminService.findReward(id); }
Natural extension to existing annotations
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Different Representations
· JSON
GET http://rewarddining.com/accounts/1 accepts application/json GET http://rewarddining.com/accounts/1.json
· XML
GET http://rewarddining.com/accounts/1 accepts application/xml GET http://rewarddining.com/accounts/1.xml
· ATOM / RSS
GET http://rewarddining.com/accounts/1 accepts application/atom+xml GET http://rewarddining.com/accounts/1.atom
Implementation not too hard thanks to Spring flexible view handling Optimizations like HTTP ETags
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XML handling
· Spring Framework 3.0 will include a revised version of the Object/XML Mapping (OXM) module
known from Spring Web Services Allows support for REST also useful e.g. for SQL XML access
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Common @MVC Refinements
· More options for handler method parameters
in addition to @RequestParam and @PathVariable @RequestHeader: access to request headers @CookieValue: HTTP cookie access supported for Servlet MVC and Portlet MVC
@RequestMapping("/show") public Reward show(@RequestHeader("region") long regionId, @CookieValue("language") String langId) { ... }
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Expression Language EL
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Expression Language
· Used in JSPs, JSF, Spring Web Flow etc. · ...to access objects, call methods etc · Currently Spring can only use values to configure Spring Beans · Obviously EL would be a nice extension... · Actually a very old enhancement request · Fundamental change
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EL in Bean Definitions
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EL in Component Annotations
@Repository public class RewardsTestDatabase { @Autowired public void setDatabaseName( @Value("#{systemProperties.databaseName}") String dbName) { ... } @Autowired public void setKeyGenerator( @Value("#{strategyBean.databaseKeyGenerator}") KeyGenerator kg) { ... } }
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EL: Impact
· Much more powerful configuration · Unified access to system properties and other configuration options · Classes with Annotations can be configured as well
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Powerful Spring EL Parser
· Custom expression parser implementation shipped as part of Spring 3.0
package org.springframework.expression next-generation expression engine inspired by Spring Web Flow 2.0's expression support
· Compatible with standard Unified EL but significantly more powerful
navigating bean properties, maps, etc method invocations construction of value objects
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EL Context Attributes
· Example showed access to EL attributes
"systemProperties", "strategyBean"
· Implicit attributes to be exposed by default, depending on runtime context
e.g. "systemProperties", "systemEnvironment"
· global platform context
access to all Spring-defined beans by name
· similar to managed beans in JSF expressions
extensible through Scope SPI
· e.g. for step scope in Spring Batch 2.0
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Web Context Attributes
· Implicit web-specific attributes to be exposed by default as well
"contextProperties": web.xml init-params "contextAttributes": ServletContext attributes "request": current Servlet/PortletRequest "session": current Http/PortletSession
· Exposure of all implicit JSF objects when running within a JSF request context
"param", "initParam", "facesContext", etc full compatibility with JSF managed bean facility
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Other features...
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Conversation Management
· Key problem: isolating concurrent windows in same browser
shared HTTP session several independent conversations going on
· keeping independent state
· Generalized: conversation scope with shorter lifetime than session
scope="conversation"
· on-demand scoping of conversational Spring beans · MyFaces Orchestra style
Spring Web Flow 3 still to provide sophisticated flow navigation management on top
· i.e. page flows can be defined · JSF support
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Scoped Bean Serializability
· Problem with Spring 2.5: serializability of session and conversation objects
when referencing shared service objects via Spring dependency injection typical situation: scoped bean instance holds on to DataSource or the like
· DataSource reference is not serializable · -> whole bean not serializable
· Solution: proxies that reobtain references on deserialization
from current Spring WebApplicationContext
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Model Validation
public class Reward { @NotNull @Past private Date transactionDate; } In view:
· Same metadata can be used for persisting, rendering, etc · Spring: to be supported for MVC data binding · JSR 303 (Bean Validation) as common ground
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New Project Layout
· Framework modules revised
now managed in Maven style one source tree per module jar
· spring-beans.jar, spring-aop.jar, etc
no spring.jar anymore! Libraries not distributed
· Built with new Spring build system as known from Spring Web Flow 2.0
consistent deployment procedure consistent dependency management consistent generation of OSGi manifests
· Impact: Use Maven, OSGi, ivy for dependency management
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Spring 3.0 and Java EE 6
· Early Java EE 6 support in Spring 3.0
integration with JSF 2.0
· Spring as fully compatible managed bean facility
integration with JPA 2.0
· support for lock modes, query timeouts, etc
compliance with JSR-236 (EE Concurrency)
· standard integration with server thread pools
AOP support for JSR-220 interceptors
· "javax.interceptor" package from EJB 3.0/3.1
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Java EE 6 Story Continued
· Spring 3.1/3.2 to provide full support for Java EE 6 platforms and conventions
Servlet 3.0
· auto-deployment of framework integration classes · Comet requests supported in Spring controllers · runtime support for Tomcat 7 and GlassFish 3
JSR-299 (formerly known as "Web Beans")
· now "Java Contexts and Dependency Injection" · Spring container support for new "javax.context", "javax.inject", "javax.event" annotation packages
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Spring 2.5 Mission Continued
· Spring 3 continues Spring 2.5's mission
fully embracing Java 5 in the core Spring programming and configuration model now with even the core framework requiring Java 5
· all framework API to use Java 5 language syntax
· Backwards compatibility with Spring 2.5
100% compatibility of programming model 95% compatibility of extension points all previously deprecated API to be removed
· Make sure you're not using outdated Spring 1.2 / 2.0 API anymore!
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Pruning & Deprecation in 3.0
· Some pruning planned
Commons Attributes support traditional TopLink API support
· in favor of JPA (EclipseLink)
· Some deprecation planned
traditional MVC controller class hierarchy
· superseded by annotated controller style
traditional JUnit 3.8 test class hierarchy
· superseded by test context framework
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Spring 3.0 Summary
· Spring 3.0 embraces REST and EL
full-scale REST support broad Unified EL++ support in the core
· Spring 3.0 significantly extends and refines annotated web controllers
RESTful URI mappings annotation-based model validation
· Spring 3.0 is designed for Java EE 5 and 6 as well as OSGi
a common architectural enabler for both worlds!
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Und als Danke Schön:
· 100 Rabatt für die Mitglieder der RuhrJUG für unsere nächsten SpringTraining in der Umgebung! · Solingen 26.-29. Mai 2009 · Gummersbach 16.-19. Juni 2009 · Registrierung unter http://www.springsource.com/de · Rabattcode: 2009-Rhjug-100
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