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Now that you ve created and deployed an EJB component, you can create a client. If you have chosen OpenEJB as your EJB container, the default JNDI name for a remote EJB 3.0 component is the EJB class name with Remote as its suffix (PostageServiceBeanRemote, in this case). Note that the JNDI name isn t specified in the standard in EJB 3.0, so this may change from container to container. In EJB 3.1, this is remedied, and beans are prescribed a predictable naming scheme so that bean JNDI names are portable across implementations.

The setter methods in the aware interfaces will be called by Spring after the bean properties have been set, but before the initialization callback methods are called, as illustrated in the following list: 1. Create the bean instance either by a constructor or by a factory method. 2. Set the values and bean references to the bean properties. 3. Call the setter methods defined in the aware interfaces. 4. Call the initialization callback methods. 5. The bean is ready to be used. 6. When the container is shut down, call the destruction callback methods.

Keep in mind that once your beans implement the aware interfaces, they are bound to Spring and may not work properly outside the Spring IoC container. You must consider carefully whether it s necessary to implement such proprietary interfaces.

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Accessing EJB 3.0 components is simpler than EJB 2.x. You can look up an EJB reference from JNDI directly without looking up its home interface first, so you don t need to handle CreateException. Moreover, the EJB interface is a business interface that doesn t throw a RemoteException. Although accessing EJB 3.0 components is simpler than EJB 2.x, the JNDI lookup code is still too complex, and you have to handle NamingException. With Spring s support, your FrontDeskImpl class can define a setter method for this EJB component s business interface for Spring to inject the EJB reference that is looked up from JNDI. package com.apress.springenterpriserecipes.post; public class FrontDeskImpl implements FrontDesk { private PostageService postageService; public void setPostageService(PostageService postageService) { this.postageService = postageService; } public double calculatePostage(String country, double weight) { return postageService.calculatePostage(country, weight); } } Spring offers the factory bean JndiObjectFactoryBean to declare a JNDI object reference in its IoC container. You declare this bean in the front desk system s bean configuration file. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

Combining These Techniques 109 Major Legacy System 110 Minor Legacy Application 110 Major New System 111 Minor New Application 112 Agile Offshore Outsourcing 112 Summary 114 CHAPTER 7 CASE STUDY:THE BILLING SYSTEM REVISITED 115 Methodology 115 Inception 116 Scoping Study 117 Project Planning Meeting 118 Elaboration 121 Review Meeting 122 Construction 123 Construction Iteration 5 124 Transition 126 Deployment 126 Aftermath 127 Summary 128 CHAPTER 8 AFTERWORD 131.

For example, you can make your cashier bean aware of its bean name in the IoC container by implementing the BeanNameAware interface. When this bean name is injected, you can save it as the cashier name. This can save you the trouble of setting another name property for the cashier. package com.apress.springrecipes.shop; ... import org.springframework.beans.factory.BeanNameAware; public class Cashier implements BeanNameAware { ... public void setBeanName(String beanName) { this.name = beanName; } } You can simplify your cashier bean declaration by using the bean name as the cashier name. In this way, you can erase the configuration of the name property and perhaps the setName() method as well. <bean id="cashier1" class="com.apress.springrecipes.shop.Cashier"> <property name="path" value="c:/cashier" /> </bean>

<bean id="postageService" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiEnvironment"> <props> <prop key="java.naming.factory.initial"> org.apache.openejb.client.RemoteInitialContextFactory </prop> <prop key="java.naming.provider.url"> ejbd://localhost:4201 </prop> </props> </property> <property name="jndiName" value="PostageServiceBeanRemote" /> </bean> <bean id="frontDesk" class="com.apress.springenterpriserecipes.post.FrontDeskImpl"> <property name="postageService" ref="postageService" /> </bean> </beans> You can configure the JNDI details for this factory bean in the jndiEnvironment and jndiName properties. Then you can inject this proxy into FrontDeskImpl in the same way as a normal bean. In Spring, JNDI objects can also be defined using the <jee:jndi-lookup> element in the jee schema. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jee="http://www.springframework.org/schema/jee" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd"> <jee:jndi-lookup id="postageService" jndi-name="PostageServiceBeanRemote"> <jee:environment> java.naming.factory.initial= org.apache.openejb.client.RemoteInitialContextFactory java.naming.provider.url=ejbd://localhost:4201 </jee:environment> </jee:jndi-lookup> ... </beans>

s Note Do you remember that you can specify the field name and the property path as the bean names of

RMI and EJB communicate through their own protocol which may not pass through firewalls. Ideally, you d like to communicate over HTTP.

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