barcode font vb.net This, of course, demonstrates that JPA can work independently of both a Java EE container and EJB 3. in Java

Generate Data Matrix ECC200 in Java This, of course, demonstrates that JPA can work independently of both a Java EE container and EJB 3.

This, of course, demonstrates that JPA can work independently of both a Java EE container and EJB 3.
Making Data Matrix ECC200 In Java
Using Barcode generator for Java Control to generate, create Data Matrix image in Java applications.
www.OnBarcode.com
Decoding Data Matrix ECC200 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
EJB 3 and Spring
Barcode Creator In Java
Using Barcode generation for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
DataMatrix Generator In Java
Using Barcode generation for Java Control to generate, create Data Matrix ECC200 image in Java applications.
www.OnBarcode.com
Wiring entity access objects The EAOs use JpaTemplate, so we need to wire the EAOs to use JpaTemplate s methods. The EAOs are wired in the Spring configuration as in listing 16.2. If you recall, the EAOs extend the org.springframework.orm.jpa.support.JpaDaoSupport and it has a dependency on EntityManager; therefore, we need to inject an instance of EntityManager. Spring s autowire-by-type mechanism indicates to the Spring container that it should find a single instance of a Spring bean that matches the property being wired. In this case, the EAO class uses the entityManager property to obtain an instance of EntityManager that we defined earlier in listing 16.2. You must pass EntityManager as a property to the EAO as follows:
UCC.EAN - 128 Encoder In Java
Using Barcode creation for Java Control to generate, create GS1-128 image in Java applications.
www.OnBarcode.com
UCC - 12 Creator In Java
Using Barcode creation for Java Control to generate, create GS1 - 12 image in Java applications.
www.OnBarcode.com
<property name = "entityManager" ref = "entityManager"/>
Making GS1 RSS In Java
Using Barcode generator for Java Control to generate, create GS1 DataBar-14 image in Java applications.
www.OnBarcode.com
Draw Identcode In Java
Using Barcode drawer for Java Control to generate, create Identcode image in Java applications.
www.OnBarcode.com
At runtime Spring will take care of creating the entityManager and injecting it into the EAO. If you re using an application-managed entity manager or using Spring with JPA outside the container, you have to wire the entityManageFactory property instead of an entityManager as follows:
Encode Data Matrix ECC200 In Objective-C
Using Barcode generation for iPad Control to generate, create Data Matrix ECC200 image in iPad applications.
www.OnBarcode.com
Data Matrix ECC200 Generator In Java
Using Barcode encoder for Java Control to generate, create Data Matrix image in Java applications.
www.OnBarcode.com
<bean id = "bidEAO" class = "actionbazaar.persistence.eao.BidSpringEAO" autowire = "byType"> <property name = "entityManagerFactory" ref = "entityManagerFactory"/> </bean>
Scanning Barcode In VB.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in .NET framework applications.
www.OnBarcode.com
Data Matrix 2d Barcode Recognizer In C#
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Wiring service beans Your web applications use service beans to access entities from the presentation tier. You simply wire your service beans (as in listing 16.2) in the Spring configuration file to have them injected. Some steps can be quite mechanical, and are required for every EAO and service bean. Appropriately configuring Spring for your server allows you to deploy the application using Spring, proving again that you can use JPA outside of a Java EE container. Let s now examine how you unite the power of Spring and EJB 3 components (session beans and MDBs).
GS1-128 Reader In Visual C#
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
ANSI/AIM Code 128 Maker In None
Using Barcode printer for Online Control to generate, create USS Code 128 image in Online applications.
www.OnBarcode.com
Combining the power of EJB 3 and Spring
Encoding Code 39 In Java
Using Barcode generator for Eclipse BIRT Control to generate, create Code 3 of 9 image in Eclipse BIRT applications.
www.OnBarcode.com
PDF417 Encoder In None
Using Barcode generator for Software Control to generate, create PDF417 image in Software applications.
www.OnBarcode.com
16.3 Combining the power of EJB 3 and Spring
Code 128 Code Set C Scanner In C#.NET
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Decoding ANSI/AIM Code 39 In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
In addition to using JPA with Spring, you may combine the flexibility of Spring beans with the power of EJB 3 in your applications. You have two options. You can use the power of Spring POJO injection, AOP features, etc. by developing Spring-enabled EJB applications, or you can invoke an EJB from a Spring bean. At the time of this writing, Spring 2.0 has no documented support for EJB 3 session beans, but we found some ways to make EJB 3 beans work with Spring beans and in this section we ll reveal our discoveries. In this section you ll see two ways you can combine power of EJB 3 components and Spring beans. First you ll learn about using Spring from EJB 3 components; then we ll show you how to access an EJB 3 session bean from a Spring bean.
Create EAN-13 In None
Using Barcode encoder for Font Control to generate, create GS1 - 13 image in Font applications.
www.OnBarcode.com
Drawing QR Code In Java
Using Barcode generation for Eclipse BIRT Control to generate, create Quick Response Code image in Eclipse BIRT applications.
www.OnBarcode.com
16.3.1 Developing Spring-enabled EJBs
Let s say you want to use declarative transactions, timers, security, and the web services features of EJB in your applications, but you also want to leverage the POJO injection, AOP and JpaTemplate features of Spring 2.0. Spring provides sev, eral support classes, listed in table 16.3, that you can use to integrate EJBs. Note that these are the classes provided for use with EJB 2, and we expect there will be several changes in these classes to be used with EJB 3. However, you can still use these abstract classes with EJB 3 beans. The abstract classes provide access to the Spring bean factory, and you have to implement the onEjbCreate method in your EJB class to retrieve a Spring bean.
Table 16.3 Spring support classes for building Spring-enabled EJBs Support Class AbstractStatelessSessionBean AbstractStatefulSessionBean AbstractJMSMessageDrivenBean AbstractMessageDrivenBean Purpose Used for Spring-enabled stateless session beans Used for Spring-enabled stateful session beans Used for Spring-enabled JMS message-driven beans Used for Spring-enabled connector-based MDBs
EJB 3 and Spring
In ActionBazaar we want to use Spring with session beans. This means that the BidServiceBean we developed in section 16.1 is used by the PlaceBid EJB, as shown in figure 16.2. The BidServiceBean is defined as a Spring bean using a Spring configuration file named actionBazaarservice.xml as follows:
<beans> ... <bean id = "bidService" class = "actionbazaar.buslogic.BidServiceBean"> </bean> ... </beans>
When an EJB instance is created, a Spring bean factory is automatically created and is made available to the EJB. While using this approach, you typically use the EJB as a fa ade and delegate the task to Spring beans. Listing 16.3 shows the PlaceBid EJB developed as a Spring-enabled stateless session bean. In this example, the PlaceBid EJB acts as a fa ade and delegates the actual business logic to the BidServiceBean.
Copyright © OnBarcode.com . All rights reserved.