2012 04-06-v2-tdp-1163-java e-evsspringshootout-final

Java EE and Spring Framework Shootout
Rohit Kelapure
WebSphere Application Server Caching Architect
Apache OpenWebBeans Committer
IBM

http://wasdynacache.blogspot.com/
http://www.linkedin.com/in/rohitkelapure
http://twitter.com/rkela
Recording: http://www.parleys.com/#st=5&id=2819&sl=0

Session ID = TDP-1163

1

Please Note
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similar to those stated here.

2

Outline
 Evolution of Java EE and Spring
 Java EE 6 & Spring 3.0, 3.1 highlights
 Spring 3.1 feature comparison with Java EE 6
 CDI and Spring ecosystem
 Spring and Java EE coexistence
 Spring to Java EE migration
 Conclusion

3

J2EE Java EE Specifications

* Introduced in spec.
4

Evolution of J2EEJava EE6 (Dec 09)
• Facelets, built-in-AJAX, Skins,
 New specs (JAX-RS, CDI, Bean Annotations, Resource handling
Validation) • Simplified Navigation, Easier custom
components, View & Page scopes
 Prune dead wood • Bookmarkable pages, Project Stage,
– EJB 2.x, JAX-RPC, JAXR, JEE App. Expanded event model
Deploy, JEE App mgmt. – JPA 2.0
 Extensibility • Mapping enhancements, JPAQL,
Criteria Query API, Pessimistic
– Easy Framework Pluggability (web locking
fragments & CDI Extensions)
 Profiles reduce platform size
 Enhanced ease of development
– Web Profile 12 specs
– POJO annotation based Servlets,
– Asynchronous processing (Servlet 3.0 &  Vendor support
EJB 3.1) – WebSphere AS 8
– EJB 3.1 – JBOSS AS 7
• EJB-in-WAR, No-interface view, – Oracle WebLogic 11g
Singleton, EJB-lite, Timers
– Glassfish 3
– Contextual Dependency Injection (CDI)
– RESTful services
– Portable JNDI names
– JSF2.0

5

JSR 299 Contexts and Dependency Injection (CDI)
 Adds dependency injection to JEE and interceptor bindings
makes it type-safe. – Refines interceptors into decorators
for finer grained control
– Hollywood principle - Don’t call us,
we will call you  Integrates with the Unified EL to bridge
– No hard coded dependencies on JSF
other specifications
– Enables use of EJB 3.0 components
 Assists in unifying the Bean model as JSF managed beans

 Well defined contexts, the ability to bind  Introduces an SPI to extend JEE – Roll
your own JEE7!
beans statefully to them & manage their
lifecycle. – Not only an API but also a SPI
– Rich ecosystem of CDI extensions
 Introduces an event notification system
 Adds the Web conversation context
to decouple producers & consumers
 Spring does NOT provide support for
 Uses interceptors to foster loose
CDI
coupling
– Extend behavior with type safe

6

Spring Framework

 Lightweight dependency injection
 Aspect oriented
 Layered application & container framework
 Well defined modules on top of the core container
 NOT an all-or-nothing solution

7

Evolution of Spring [ 1.0, 2.0, 2.5, 3.0, 3.1]

3.0 3.1
• JSR-330 “at • A new “c”
inject” namespace
2.5 • New Spring • Configuration
1.0 2.0 • Annotation- Expression profiles
• Dependency
driven wiring Language
• Problem-
• Automatic • First-class REST • Unified
injection specific XML
bean support property
• POJO- • Extensible
oriented configuration • Java-based resolution
configuration
development • New configuration • Java
• Bean scoping annotation-
• Declarative • Several new configuration
• Groovy, JRuby, driven MVC Spring MVC
AOP &
and BeanShell
features
transactions framework features
• MVC • JSP tag library • JUnit 4-based
• Servlet 3.0
• Support for JSR- support
framework • Java 5 integration 303 declarative
autoboxing testing validation • Declarative
and generics • Annotation-based caching
background and • Spring MVC
scheduled jobs enhancements

8

Java EE vs. Spring Framework Features/APIs

10

Java EE vs. Spring Business Component

11

Spring XML for Business Component Injection

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Spring XML for Business Component Injection

13

Spring Java Based Configuration

14

Spring Java Based Configuration

15

Java EE Interceptor vs. Spring Aspects

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Java EE vs. Spring Injection

17

Java EE vs. Spring Injection

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JSF 2 vs. Spring MVC Front Controller
 Facelet Component

19

 Facelet

20

Entity

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JSF 2 vs. Spring MVC
Spring MVC JSP

22

Spring MVC Configuration

23

Spring MVC web.xml configuration

25

Java EE vs. Spring Scheduling

26

Java EE vs. Spring Scheduling

27

Java EE vs. Spring Messaging

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Spring JMS Configuration

29

Spring Message Producer

30

Java EE Message Producer & JMS Abstraction

31

Java EE Message Producer & JMS Abstraction

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Hacking the Java EE Platform - CDI Extensions
 Activated by dropping jars on the application classpath
 Loaded by the java.util.ServiceLoader SPI
 Integrate with container through container lifecycle events by
– Register additional beans, interceptors and decorators
– Injecting dependencies into its own objects
– Introduce custom scope with backing context
– Augment or override bean annotation-based metadata with other
source
 Tools/utilities, extending Java EE, integration with Java EE
APIs, integrating with non-standard APIs, making Java EE
features available in non-Java EE

33

CDI Ecosystem Snapshot

Implementations Portable Runtimes
Extensions

Weld CanDI

Tools

35

Spring & Java EE Coexistence
 Integration with Java EE APIs
– Spring beans can be injected into JSF Managed Beans
– Spring beans can be referenced in EL with no JSF Backing beans
– Spring JmsTemplate can be used on top of raw JMS API for convenience
– Spring Listeners similar to EJB MDBs especially JCA rather than JMS listeners
– Hibernate validator standardized as Bean Validation (JSR 303)
– Spring 3 supports excellent bi-directional integration with EJBs
– CDI and Spring Integration through the Spring Bridge to CDI

 Native support for Java EE
– Java EE5 and Java EE6 annotations supported by Spring
– Spring can use JPA / Hibernate natively

 Application server integration
– DataSources can use application server QoS like pooling, transactions, statement caching,
debugging, monitoring and security

36

Best Practices integrating Spring WAS
 Presentation tier considerations
– Web MVC & Portlet
 Data access considerations
– Using JDBC native connections
– Transactions, JPA & JMS
 Spring Security Considerations
– Bypassing WAS security
 Integration & Management considerations
– Registering Spring Mbeans in the application server
– Classloaders
 Design Considerations
– Unmanaged threads
– Scheduling & Threadpools
37

Java EE coexistence with Spring

38

Migrating Spring to Java EE 6
1. Upgrade Spring version
2. Replace old frameworks (ORM, Web Framework) within Spring
3. Run Spring and Java EE container side by side
4. Replace Spring entirely
5. Remove Spring container

39

Myths of Java EE
 EJBs are heavy weight "bloated“
 EJBs are hard to test  J2EE and EJB2 sucked! “That
 EJBs are not portable was eight years ago! Is this really
your best shot?”
 EJBs are slow
 Application server portability is a
 EJBs are not scalable myth!
 EJBs are too complex
 EJBs are hard to integrate with
Web Frameworks and POJOs
 EJBs are hard to configure
 EJBs are hard to migrate
 EJBs are hard to develop
 EE application servers are

40

References
 Evolution of Java EE http://en.wikipedia.org/wiki/Java_EE_version_history
 Java EE 6 Tutorial http://download.oracle.com/javaee/6/tutorial/doc/
 Spring Docs http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/
 Spring Projects http://www.springsource.org/projects
 Miscellaneous CDI Extensions https://github.com/softwaremill/softwaremill-common
 Migrating Spring to Java EE
– https://github.com/paulbakker/migrating-spring-to-javaee
– http://ocpsoft.com/java/spring-to-java-ee-a-migration-guide-cdi-jsf-jpa-jta-ejb/
 CDI- Spring Bridge
– http://rick-hightower.blogspot.com/2011/04/cdi-and-spring-living-in-harmony.html
– http://niklasschlimm.blogspot.com/2011/08/jsr-299-cdi-interceptors-for-spring.html
– http://niklasschlimm.blogspot.com/2011/08/jsr-299-cdi-decorators-for-spring-beans.html
 Best practices integrating Spring with WebSphere Application Server
– http://www.ibm.com/developerworks/websphere/techjournal/0609_alcott/0609_alcott.htm
 What’s new in Spring 3.1 http://static.springsource.org/spring/docs/3.1.x/spring-framework-
reference/htmlsingle/spring-framework-reference.html#new-in-3.1

42

References continued
 SEAM 3 http://seamframework.org/Seam3
 CODI http://myfaces.apache.org/extensions/cdi/
 Weld http://seamframework.org/Weld
 CanDI http://www.caucho.com/resin/candi/
 OpenWebBeans
http://openwebbeans.apache.org/owb/index.html

43

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44

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© IBM Corporation 2012. All Rights Reserved.

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2012 04-06-v2-tdp-1163-java e-evsspringshootout-final

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