What's new in Spring 3?

Who Am I?

E-mail: craig@habuma.com Blog: http://www.springinaction.com Twitter: habuma

Who Am I?
Java, Spring, and OSGi fanatic


Who Am I?
Principal Consultant with Improving


Who Am I?
Principal Consultant with Improving
Author
XDoclet 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
Spring 1.x
<bean class="...">
</bean>


Evolution of Spring
Spring 1.x
<bean class="...">
</bean>
Spring 2.0
<tx:/>


Evolution of Spring
Spring 1.x
<bean class="...">
</bean>
Spring 2.0
<tx:/>

Spring 2.5
@Component
@Autowired


Evolution of Spring
Spring 1.x
<bean class="...">
</bean>
Spring 2.0
<tx:/>

Spring 2.5
@Component
@Autowired 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
<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

<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

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

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


Annotation-Driven Wiring



Java:


@Component
public class Linus {

Java:
@Autowired
private Blanket blanket;

public Blanket getBlanket() {
return blanket;
}
}


@Component

Java:
@Autowired

return blanket;
}
}

Spring
: Context

@Component

Java:
@Autowired

return blanket;
}
}

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

Spring Expression Language


Wires values evaluated from expressions
Works in XML and annotations


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

public Blanket() {
}

// ...
}


Expression variables



Any bean ID



Any bean ID
systemProperties



Any bean ID
systemProperties

Scope/Context-speciﬁc...
contextProperties

contextAttributes

request

session


SpEL examples


SpEL examples
Referencing bean properties


SpEL examples
"#{settingBean.databaseUrl}"


SpEL examples

Referencing system properties


SpEL examples

"#{systemProperties.favoriteColor}"


SpEL examples


Evaluating truth


SpEL examples


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


SpEL examples


Evaluating truth

Using static methods


SpEL examples


Evaluating truth

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


SpEL examples


Evaluating truth


Templated Strings


SpEL examples


Evaluating truth


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


@RequestHeader

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


@CookieValue


@CookieValue

Spring 2.5:
@Controller
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:
@Controller
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


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


default values


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

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


<spring:url>


<spring:url>
New JSP tag
Generates context-senstive URL


<spring:url>
New JSP tag
Generates 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
@Column(name="spittleText")
@NotNull
In entity @Size(min=1, max=140)
class public String getText() {
return this.text;
}

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


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>
<servlet-name>spitter</servlet-name>
</filter-mapping>


ETag Support
<filter>
<filter-class>
org.springframework.web.filter.ShallowEtagHeaderFilter
</filter-class>
</filter>

<filter-mapping>
</filter-mapping>

Returns HTTP 304 if content is unmodiﬁed
if-none-match
(MD5 Hash comparison)
Saves bandwidth

HTTP Method Conversion


HTTP deﬁnes four methods:
GET, POST, DELETE, and PUT


HTML only supports 2:
GET and POST


GET and POST
Spring 3’s HiddenHttpMethodFilter ﬁxes that


GET and POST
Spring 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>
</filter-mapping>


HTTP Methods in Spring MVC


Spring MVC form tags support hidden HTTP
methods


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


methods
</form:form>

Controllers can handle all HTTP methods


methods
</form:form>

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

ContentNegotiatingViewResolver
Chooses a view based on HTTP Accepts header, JAF
content type, format parameter, or request path
extension


Content negotiation

ContentNegotiatingViewResolver
Chooses a view based on HTTP Accepts header, JAF
content type, format parameter, or request path
extension
New view resolvers
AbstractAtomFeedView
AbstractRssFeedView
MarshallingView
MappingJacksonJsonView


REST consumption


REST consumption
New RestTemplate


REST consumption
New RestTemplate

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


REST consumption
New RestTemplate

Read

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


REST consumption
New RestTemplate

Read

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

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


JavaConfig


JavaConfig
@Configuration
public 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
@Component
public class KiteEatingTree
implements DeciduousTree {

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

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


Asynchronous Methods



Annotate a bean method
@Async
public void backgroundJob()
{ ... }



Annotate a bean method
@Async
public void backgroundJob()
{ ... }

In Spring conﬁguration:
<task:annotation-driven/>


Scheduling


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


Scheduling

@Scheduled(fixedRate=3000L)


Scheduling

@Scheduled(fixedRate=3000L)

@Scheduled(cron="0 0 0 * * SAT)


Miscellaneous


Miscellaneous

Object-to-XML mapping from Spring-WS


Miscellaneous

Object-to-XML mapping from Spring-WS
Embracing Java 5 (generics, autoboxing,
annotations, etc).


Bye bye


Bye bye

Spring MVC controller hierarchy (deprecated)


Bye bye


JUnit 3 testing


Bye bye


JUnit 3 testing
Commons Attributes


Bye bye


JUnit 3 testing
Commons Attributes
Native TopLink support


Bye bye


JUnit 3 testing
Commons Attributes
WebLogic 8.1 and WebSphere 5.1


Bye bye


JUnit 3 testing
Commons Attributes
WebLogic 8.1 and WebSphere 5.1
spring.jar


Keep your eye on...


Keep your eye on...
Spring Web Flow 2.0


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0
Spring Dynamic Modules (Spring-DM)


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0
SpringSource dm Server


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0
SpringSource tc Server


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0
Roo


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0
Roo
Groovy/Grails


Keep your eye on...
Spring Web Flow 2.0
Spring BlazeDS
Spring Security 3.0
Roo
Groovy/Grails
SpringSource Tool Suite

Spring simplifies


Spring simplifies

Spring’s initial focus was to simplify
enterprise Java


Spring simplifies

enterprise Java
Now simpliﬁcation efforts turn inward


Spring simplifies

enterprise Java
Trending away from XML toward annotations


Spring simplifies

enterprise Java
Trending away from XML toward annotations
All the while, offering more power


Thank You

Don’t forget the evals!

What's new in Spring 3?

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