From the Spring Framework to Java EE 7
Ivar Grimstad
JDD 2013
@ivar_grimstad
About the Speaker
Ivar Grimstad
Software Architect at Cybercom Sweden
JDD 2013
@ivar_grimstad
What this presentation is NOT about
“ […] is so much better than […]!”
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What this presentation is NOT about
“[…] rocks and […] sucks!”
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What this presentation IS about
• Feature comparison
• Migration from Spring Framework to Java EE
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Content
• Background
• Comparison of Spring Framework and Java EE
• Convert Demo application to Java EE
– Highlight differences and similarities
• Lessons learned
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History
1998
• JPE
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1999
• J2EE 1.2
2001
• J2EE 1.3
2002
• Spring
2003
• J2EE 1.4
2004
• Spring 1
2006
2009
2013
• Java EE 5
• Spring 2
• Java EE 6
• Spring 3
• Java EE 7
• Spring 4
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Spring Framework
• Flexible
• Lightweight
• Modular
• Extensible
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Java EE 7
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Comparison of Selected Features
Feature
Spring 3.2.x
Java EE 7
Dependency Injection
Spring IoC
CDI
Web Framework
Spring MVC
JSF
REST
Spring MVC
JAX-RS
Transactions
Annotations, AOP
EJB, JTA
Persistence
JDBC Templates, Spring Data
JPA
Batch
Spring Batch
Batch Applications for Java Platform 1.0
WebSockets
-
Java API for WebSockets 1.0
Validation
Spring Validation API
Bean Validation API
Security
Spring Security
Java EE Security
Messaging
JMS
JMS
JDD 2013
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Comparison of Selected Features
Feature
Spring 3.2.x
Java EE 7
Dependency Injection
Spring IoC
CDI
Web Framework
Spring MVC
JSF
REST
Spring MVC
JAX-RS
Transactions
Annotations, AOP
EJB, JTA
Persistence
JDBC Templates, Spring Data
JPA
Batch
Spring Batch
Batch Applications for Java Platform 1.0
WebSockets
-
Java API for WebSockets 1.0
Validation
Spring Validation API
Bean Validation API
Security
Spring Security
Java EE Security
Messaging
JMS
JMS
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Demo
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Demo Application
• Online Cook Book
– Web UI
– REST API
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Demo Application Data Model
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Demo Application Architecture
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Spring Implementation
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Demo Application Characteristics
• WEB Application
• Based on Spring Framework
• Mix of XML and Annotations
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Migration Steps
1. Add Java EE dependency
2. Layer for layer
1. Add layer specific Java EE configuration
(web.xml, persistense.xml, faces-config.xml)
2. Add Java EE annotations
3. Replace Spring specific implementation with Java EE
4. Replace Spring injections with CDI
3. Remove Spring configuration
4. Remove Spring Dependencies
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Layer for Layer Walkthrough
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Preparations
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Dependency Injection
Spring IoC
@Autowired
XML
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CDI
@Inject
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Persistence Layer
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Persistence Layer
Spring JDBC
@Repository
JdbcTemplate
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JPA
@PersistenceContext
@Entity
@OneToMany,
@ManyToOne,
@ManyToMany
persistence.xml
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Spring JDBC
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JPA
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Service Layer
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Service Layer
Spring POJO
@Service
@Transactional
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EJB
@Local
@Stateless
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Spring
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EJB
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REST API
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REST API
Spring MVC
@Controller
@RequestMapping
@ResponseBody
@RequestBody
@PathVariable
@RequestParam
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JAX-RS
@Path
@GET, @POST,
@PUT, @DELETE
@Consumes,
@Produces
@PathParam
@QueryParam
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Spring MVC
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JAX-RS
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Web UI
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Web UI
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Spring MVC
JSP
Java ServerFaces
XHTML
@Controller
@RequestMapping
@Named
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Spring MVC Controller
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JSF Controller
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Spring resources (i18n)
applicatonContext.xml
Create.jsp
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JSF resources (i18n)
faces-config.xml
Create.xhtml
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Remove Spring
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Application Architecture - Spring
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Application Architecture – Java EE
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Migration Steps – what we did
1. Added Java EE dependency
2. Layer for layer
1. Added layer specific Java EE configuration
(web.xml, persistense.xml, faces-config.xml)
2. Added Java EE annotations
3. Replaced Spring specific implementation with Java EE
4. Replaced Spring injections with CDI
3. Removed Spring configuration
4. Removed Spring Dependencies
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Dependencies (Spring)
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Dependencies (Java EE)
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WAR File (Spring)
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WAR File (Java EE)
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What about testing?
• Spring Framework has excellent support for testing
• No direct support for testing in Java EE 7
• Tools like Arquillian is an option
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Not Covered Here
• Simplified JMS
• Java API for WebSocket 1.0
• JSON Processing 1.0
• Batch Applications for Java Platform 1.0
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Why Migrate?
• Spring IS a proprietary framework
• Java EE is a standard
• Many Spring applications run in a Java EE container anyway
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When NOT to Migrate?
• If your target platform is prior to Java EE 6
• If your developers are experts on Spring Framework
• If your application is heavily based on AOP
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Lessons Learned
• Migration is not that hard
• How hard it is depends on application structure
• Migration from newer Spring version is easier
– may even be required to upgrade first
• Not all applications can be migrated
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Wrap Up
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