1. Struts 2
Spring and JPA / Hibernate
Integration
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2. Why use Spring with Struts ?
 It is a lightweight dependency injection and
aspect-oriented container and framework.
 Promote Loose Coupling through Dependancy
Injection.
 Most popular technology for managing creation
of objects in a Java application.
 Has its own MVC application framework.
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3. Adding Spring to Struts2 Contd…..
 Add the Spring plug-in to application.
 Add
org.springframework.web.context.ContextLoaderListener
to web.xml in listener tag.
 ApplicationContext.xml file will be used for doing the
Spring bean configuration.
 Spring Provides the autowiring mechanism through
which it automatically inject dependencies without
explicitly declaring the wiring in applicationContext.xml
 Autowiring can be done by name, type, constructor or
auto. KrazyKoder.com

4. Adding Spring to Struts2 …..Contd.
 All objects which spring manages are called “Spring Beans” and all spring
beans are created as Singleton.
 Add bean to applicationContext.xml file and change scope of bean to
Prototype.
 ID in first bean to identify the bean, much like a reference is used to identify
an object in Java code.
 Property tag looks for setter method with the same name as the property
tag’s name attribute.
 Value to inject into this setter is specified with the ref attribute
 Ex : <bean id="portfolioService"
class="manning.chapterNine.utils.PortfolioServiceJPAImpl"/>
<bean id="springManagedLoginAction” class="manning.chapterNine.Login“
scope="prototype">
<property name="portfolioService" ref="portfolioService"/>
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</bean>

5. Adding JPA with Struts 2?
 This technology, wrapped around Hibernate.
 Coding to the JPA works a lot like coding to native
Hibernate.
 Interface-based architecture gives you the ability to
switch out the vendor supplying the underlying
implementation.
 Shows how to use the well-respected Spring support for
JPA to make management of the JPA all that much
easier.
 Main entry point into the JPA is EntityManager. This
object manages all persistent entities. KrazyKoder.com

6. Adding JPA with Struts 2?
 Declare a bean postprocessor that checks all the beans
managed by Spring for persistence-related annotations
 EntityManagerFactory managed by Spring encapsulates
most of the details of persistence unit.
 Main entry point into configuring persistence unit is the
persistence.xml file.
/WEB-INF/classes/METAINF/persistence.xml
 Through JPA we can use Java annotations to map java
classes to database.
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7. Done!
 Click the icon at the bottom to proceed!
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