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sessionContext = sessionContext; } public double calculatePostage(String country, double weight) { return postageServicecalculatePostage(country, weight); } } In the ejbCreate() life cycle method, you instantiate the POJO service implementation class It s up to this object to perform the actual postage calculation The EJB component just delegates requests to this object The astute reader will note that the ejbCreate() method is nowhere to be found on the SessionBean interface Instead, it s a convention Stateless session beans can contain one version of ejbCreate() If the method has any arguments, the corresponding create method on the EJBHome bean must have the same arguments The ejbCreate() method is the EJB hook for initialization of state, much as a JSR-250 annotated @PostConstruct() method or afterPropertiesSet() method work in Java EE 5 and Spring If you have a stateful session bean, then there may be multiple overloaded ejbCreate() methods.

He divided the remainder of the project into Design, Construction, and Testing/Debug phases (Figure 4-1).

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public void setDiscount(double discount) { this.discount = discount; } public Class getObjectType() { return product.getClass(); } protected Object createInstance() throws Exception { product.setPrice(product.getPrice() * (1 - discount)); return product; } } By extending the AbstractFactoryBean class, your factory bean can simply override the createInstance() method to create the target bean instance. In addition, you have to return the target bean s type in the getObjectType() method for the auto-wiring feature to work properly. Next, you can declare your product instances with DiscountFactoryBean. Each time you request a bean that implements the FactoryBean interface, the Spring IoC container will use this factory bean to create the target bean and return it to you. If you are sure that you want to get the factory bean instance itself, you can use the bean name preceded by &. <beans ...> <bean id="aaa" class="com.apress.springrecipes.shop.DiscountFactoryBean"> <property name="product"> <bean class="com.apress.springrecipes.shop.Battery"> <constructor-arg value="AAA" /> <constructor-arg value="2.5" /> </bean> </property> <property name="discount" value="0.2" /> </bean> <bean id="cdrw" class="com.apress.springrecipes.shop.DiscountFactoryBean"> <property name="product"> <bean class="com.apress.springrecipes.shop.Disc"> <constructor-arg value="CD-RW" /> <constructor-arg value="1.5" /> </bean> </property> <property name="discount" value="0.1" /> </bean> </beans>

Similarly, for each overloaded form of ejbCreate() on the SessionBean, there must be a create method with the same arguments on the EJBHome We mention all this (which, if we re honest, doesn t even begin to cover the nuances involved) to put in stark relief the Spring container s lightweight approach and to show that even the Spring abstractions for EJB 2x are incredible improvements..

The preceding factory bean configuration works in a similar way to the following code snippet: DiscountFactoryBean &aaa = new DiscountFactoryBean(); &aaa.setProduct(new Battery("AAA", 2.5)); &aaa.setDiscount(0.2); Product aaa = (Product) &aaa.createInstance(); DiscountFactoryBean &cdrw = new DiscountFactoryBean(); &cdrw.setProduct(new Disc("CD-RW", 1.5)); &cdrw.setDiscount(0.1); Product cdrw = (Product) &cdrw.createInstance();

You would like to declare a bean in the Spring IoC container from a static field. In Java, constant values are often declared as static fields.

Finally, you require an EJB deployment descriptor for your EJB component. You create the file ejb-jar.xml in the META-INF directory of your classpath and add the following contents to describe your EJB component: <ejb-jar> <enterprise-beans> <session> <display-name>PostageService</display-name> <ejb-name>PostageService</ejb-name> <home>com.apress.springenterpriserecipes.post.PostageServiceHome</home> <remote>com.apress.springenterpriserecipes. post.PostageServiceRemote</remote> <ejb-class> com.apress.springenterpriserecipes.post.PostageServiceBean </ejb-class> <session-type>Stateless</session-type> <transaction-type>Bean</transaction-type> </session> </enterprise-beans> </ejb-jar> Now your EJB component is finished, and you should pack your interfaces, classes, and deployment descriptors in a JAR file. Then start up your EJB container and deploy this EJB component to it.

To declare a bean from a static field, you can make use of either the built-in factory bean FieldRetrievingFactoryBean, or the <util:contant> tag in Spring 2.x.

Note To start the OpenEJB container, you first set the OPENEJB_HOME environment variable to point to your OpenEJB installation directory. Then execute the OpenEJB startup script (located in the bin directory) with the parameter start (e.g., openejb start). In another shell, to deploy an EJB component, you also execute the OpenEJB startup script, but this time you pass deploy and the location of your EJB JAR file as parameters. (e.g., openejb deploy PostService.jar).

Phil also considered which risks were most likely to affect the project (Table 4-2). He followed the common practice of multiplying together the probability and impact of each risk to obtain a figure for how much contingency was needed. The impact of sickness could be ignored since Acme didn t pay for the contractors sick leave, and because he thought that one end user could easily be substituted for another. After adding 10 percent contingency for unknown risks, Phil ended up with what he thought was a generous contingency reserve of 25 percent for the project as a whole.

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