What's new in Spring 3?

What’s New in Spring 3

E-mail: [email protected] Blog: http://www.springinaction.com Twitter: habuma

Who Am I?


Who Am I?

Java, Spring, and OSGi fanatic


Who Am I?

Java, Spring, and OSGi fanaticPrincipal Consultant with Improving


Who Am I?


AuthorXDoclet in Action (Manning)

Spring in Action (Manning)

Modular Java (Pragmatic Bookshelf)


Who Am I?


AuthorXDoclet in Action (Manning)

Spring in Action (Manning)

Modular Java (Pragmatic Bookshelf)

Where we’ve been

Spring: This is your life!


Evolution of Spring


Evolution of Spring

<bean class="..."></bean>

Spring 1.x


Evolution of Spring


<tx:/>

Spring 1.x

Spring 2.0


Evolution of Spring


<tx:/>

Spring 1.x

Spring 2.0

@Component@Autowired

Spring 2.5


Evolution of Spring


<tx:/>

Spring 1.x

Spring 2.0


Spring 2.5

Spring 3.0?


Evolution of Spring


<tx:/>

Spring 1.x

Spring 2.0


Spring 2.5

Spring 3.0?


Spring 1.0


Spring 1.0

Dependency injection


Spring 1.0


POJO-oriented development


Spring 1.0



Declarative AOP and transactions


Spring 1.0



Declarative AOP and transactions

MVC framework


Spring 2.0


Spring 2.0

Problem-specific XML


Spring 2.0


Extensible configuration


Spring 2.0



Bean scoping


Spring 2.0



Bean scoping

Groovy, JRuby, and BeanShell


Spring 2.0



Bean scoping


JSP tag library


Spring 2.0



Bean scoping


JSP tag library

Java 5 autoboxing and generics


Spring 2.5


Spring 2.5

Annotation-driven wiring


Spring 2.5


Automatic bean configuration


Spring 2.5



New annotation-driven MVC framework


Spring 2.5



New annotation-driven MVC framework

JUnit 4-based integration testing


Spring 1.0


Spring 1.0

<bean id="linus" class="com.springinaction.peanuts.Linus"> <property name="blanket"> <ref bean="blanket" /> </property></bean>

<bean id="blanket" class="com.springinaction.peanuts.Blanket"> <property name="color"> <value>blue</value> </property></bean>


Spring 1.1


Spring 1.1

<bean id="linus" class="com.springinaction.peanuts.Linus"> <property name="blanket" ref="blanket" /></bean>

<bean id="blanket" class="com.springinaction.peanuts.Blanket"> <property name="color" value="blue" /></bean>


Spring 2.0


Spring 2.0

<bean id="linus" class="com.springinaction.peanuts.Linus" p:blanket-ref="blanket" />

<bean id="blanket" class="com.springinaction.peanuts.Blanket" p:color="blue" />


Spring 2.5


Spring 2.5

<context:component-scan base-package="com.springinaction.peanuts" />

<bean id="blanket" class="com.springinaction.peanuts.Blanket" p:color="blue" />


Annotation-Driven Wiring


Annotation-Driven Wiring

Java:


Annotation-Driven Wiring@Componentpublic class Linus { @Autowired private Blanket blanket;

public Blanket getBlanket() { return blanket; }}

Java:




Java:

Spring: Context




<context:component-scan base-package="com.springinaction.peanuts" />

Java:

Spring: Context

What’s new in Spring 3?


Spring Expression Language



Wires values evaluated from expressionsWorks in XML and annotations




<bean class="com.springinaction.peanuts.Blanket"> <property name="color" value="#{someOtherBean.color}" /></bean>




@Componentpublic class Blanket { @Value("#{someOtherBean.color}") private String color;

public Blanket() { }

// ...}


Expression variables



Any bean ID



Any bean IDsystemProperties



Any bean IDsystemProperties

Scope/Context-specific...contextProperties

contextAttributes

request

session


SpEL examples


SpEL examplesReferencing bean properties



"#{settingBean.databaseUrl}"




Referencing system properties




Referencing system properties"#{systemProperties.favoriteColor}"





Evaluating truth





Evaluating truth"#{systemProperties.favoriteColor == 'red'}"






Using static methods






Using static methods"#{T(java.lang.Math).random()}"







Templated Strings







Templated Strings"The time is #{T(java.lang.System).currentTimeMillis()}"


One more SpEL example



Collection projection



Collection projection"#{snoopyPersonas.![name]}"


@PathVariable


@PathVariable

Spring 2.5:@Controllerpublic class SpittleListController { @RequestMapping("/spittleList.htm") public String displaySpittleList(@RequestParam("username") String userName) { // ... return "spittleList"; }}

http://localhost:8080/spitter/spittleList.htm?username=habuma


@PathVariable

Spring 3.0:@Controllerpublic class SpittleListController { @RequestMapping("/{username}/list") public String displaySpittleList(@PathVariable("username") String userName) { // ... return "spittleList"; }}

http://localhost:8080/spitter/habuma/list


@RequestHeader


@RequestHeader

Spring 2.5:@Controllerpublic class HomeController { @RequestMapping("/home") public String displayHomePage(HttpServletRequest request) { String userAgent = request.getHeader("User-Agent"); // ... return "home"; }}


@RequestHeader

Spring 3.0:@Controllerpublic class HomeController { @RequestMapping("/home") public String displayHomePage(@RequestHeader("User-Agent") String userAgent) { // ... return "home"; }}


@CookieValue


@CookieValue

Spring 2.5:@Controllerpublic class HomeController { @RequestMapping("/home") public String displayHomePage(HttpServletRequest request) { String lastVisit = "never"; Cookie[] cookies = request.getCookies(); for (Cookie cookie : cookies) { if("LastVisit".equals(cookie.getName())) { lastVisit = cookie.getValue(); } } // ... return "home"; }}


@CookieValue

Spring 3.0:@Controllerpublic class HomeController { @RequestMapping("/home") public String displayHomePage(@CookieValue("LastVisit") String lastVisit) { // ... return "home"; }}


default values


default values

New for @RequestParam@RequestParam(value="productId", defaultValue="1234") String productId


default values


Standard issue for @RequestHeader and @CookieValue


default values



@RequestHeader(value="User-Agent", defaultValue="1234") String userAgent


default values



@RequestHeader(value="User-Agent", defaultValue="1234") String userAgent

@CookieValue(value="LastVisit", defaultValue="1234") String lastVisit


<spring:url>


<spring:url>

New JSP tagGenerates context-senstive URL


<spring:url>

New JSP tagGenerates context-senstive URL

<spring:url value="/spittle/{id}/edit" var="editUrl" escapeXml="true"> <spring:param name="id" value="${spittle.id}" /></spring:url>

<a href="${editUrl}">Do something</a>


Declarative Validation



Based on JSR-303 validators




Hibernate Validator as default implementation





Primarily used to validate inputs to Spring MVC controllers





Primarily used to validate inputs to Spring MVC controllers

Configured automatically with <mvc:annotation-driven/>


More on validation

@RequestMapping(method=POST) public String addSpittle( @Valid Spittle spittle, BindingResult result) { if(result.hasErrors()) { return "spittle/form"; } spitterService.addSpittle(spittle); return "redirect:/home"; }

In Spring MVCcontroller

@Column(name="spittleText") @NotNull @Size(min=1, max=140) public String getText() { return this.text; }

In entityclass


ETag Support


ETag Support

ShallowEtagHeaderFilter


ETag Support

<filter> <filter-name>etagFilter</filter-name> <filter-class> org.springframework.web.filter.ShallowEtagHeaderFilter </filter-class> </filter> <filter-mapping> <filter-name>etagFilter</filter-name> <servlet-name>spitter</servlet-name> </filter-mapping>



ETag Support

<filter> <filter-name>etagFilter</filter-name> <filter-class> org.springframework.web.filter.ShallowEtagHeaderFilter </filter-class> </filter> <filter-mapping> <filter-name>etagFilter</filter-name> <servlet-name>spitter</servlet-name> </filter-mapping>


Returns HTTP 304 if content is unmodifiedif-none-match

(MD5 Hash comparison)

Saves bandwidth


HTTP Method Conversion


HTTP Method ConversionHTTP defines four methods:

GET, POST, DELETE, and PUT



GET, POST, DELETE, and PUTHTML only supports 2:

GET and POST




GET and POSTSpring 3’s HiddenHttpMethodFilter fixes that




GET and POSTSpring 3’s HiddenHttpMethodFilter fixes that

<filter> <filter-name>hiddenMethodFilter</filter-name> <filter-class> org.springframework.web.filter.HiddenHttpMethodFilter </filter-class> </filter> <filter-mapping> <filter-name>hiddenMethodFilter</filter-name> <servlet-name>spitter</servlet-name> </filter-mapping>


HTTP Methods in Spring MVC



Spring MVC form tags support hidden HTTP methods




<form:form method="delete"> <p class="submit"><input type="submit" value="Delete Spittle"/></p></form:form>





Controllers can handle all HTTP methods





Controllers can handle all HTTP methods@RequestMapping(method = RequestMethod.DELETE)public String deleteSpittle(@PathVariable long spittleId) { spittleService.deleteSpittle(spittleId); return "redirect:/home";}


Content negotiation


Content negotiation

ContentNegotiatingViewResolverChooses a view based on HTTP Accepts header, JAF

content type, format parameter, or request path extension


Content negotiation

ContentNegotiatingViewResolverChooses a view based on HTTP Accepts header, JAF

content type, format parameter, or request path extension

New view resolversAbstractAtomFeedViewAbstractRssFeedView

MarshallingViewMappingJacksonJsonView


REST consumption


REST consumption

New RestTemplate


REST consumption

New RestTemplate

ReadRestTemplate template = new RestTemplate();template.getForObject("http://localhost:8080/spitter/users/${id}", String.class, userId);


REST consumption

New RestTemplate


Create RestTemplate template = new RestTemplate();SpitterUser user = new SpitterUser(userName, password);template.postForLocation("http://localhost:8080/spitter/users/${id}", user, userId);


REST consumption

New RestTemplate


Delete RestTemplate template = new RestTemplate();template.delete("http://localhost:8080/spitter/users/${id}", userId);

Create RestTemplate template = new RestTemplate();SpitterUser user = new SpitterUser(userName, password);template.postForLocation("http://localhost:8080/spitter/users/${id}", user, userId);


JavaConfig


JavaConfig@Configurationpublic class PeanutsConfiguration {

@Bean public Linus linus() { Linus linus = new Linus(); linus.setBlanket(blanket()); return linus; } @Bean private Blanket blanket() { Blanket blanket = new Blanket(); blanket.setColor("blue"); return blanket; }}


JavaConfig in Components


JavaConfig in Components

@Componentpublic class KiteEatingTree implements DeciduousTree {

public void shedLeaves() { // ... }

@Bean public Kite kite() { return new Kite(); }}


Asynchronous Methods



@Asyncpublic void backgroundJob(){ ... }

Annotate a bean method



@Asyncpublic void backgroundJob(){ ... }

<task:annotation-driven/>

Annotate a bean method

In Spring configuration:


Scheduling


Scheduling

@Scheduled(fixedDelay=3000L) public void ping() { ... }


Scheduling


@Scheduled(fixedRate=3000L) public void ping() { ... }


Scheduling


@Scheduled(fixedRate=3000L) public void ping() { ... }

@Scheduled(cron="0 0 0 * * SAT) public void ping() { ... }


Miscellaneous


Miscellaneous

Object-to-XML mapping from Spring-WS


Miscellaneous

Object-to-XML mapping from Spring-WSEmbracing Java 5 (generics, autoboxing,

annotations, etc).

What’s going away


Bye bye


Bye bye

Spring MVC controller hierarchy (deprecated)


Bye bye


JUnit 3 testing


Bye bye


JUnit 3 testingCommons Attributes


Bye bye



Native TopLink support


Bye bye



Native TopLink supportWebLogic 8.1 and WebSphere 5.1


Bye bye



Native TopLink supportWebLogic 8.1 and WebSphere 5.1

spring.jar


Bye bye

What else?


Keep your eye on...


Keep your eye on...

Spring Web Flow 2.0


Keep your eye on...

Spring Web Flow 2.0Spring BlazeDS


Keep your eye on...


Spring Security 3.0


Keep your eye on...


Spring Security 3.0Spring Dynamic Modules (Spring-DM)


Keep your eye on...



SpringSource dm Server


Keep your eye on...



SpringSource dm ServerSpringSource tc Server


Keep your eye on...




Roo


Keep your eye on...




RooGroovy/Grails


Keep your eye on...




RooGroovy/Grails

SpringSource Tool Suite

In summary...


Spring simplifies


Spring simplifies

Spring’s initial focus was to simplify enterprise Java


Spring simplifies


Now simplification efforts turn inward


Spring simplifies


Now simplification efforts turn inwardTrending away from XML toward annotations


Spring simplifies


Now simplification efforts turn inwardTrending away from XML toward annotations

All the while, offering more power


Spring simplifies

Thank You

Don’t forget the evals!

Technology

What's new in Spring 3?