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how to estimate a software schedule from the estimated number of lines of code in the finished software. However, the data that he presents is based on software development projects in the 1970s and 1980s. Back then, the bulk of software development work was repetitive. There were no enterprise application frameworks, and almost all of the code was written from scratch. Nowadays we expect that the majority of the work will have already been done for us, because we ll be using an enterprise application framework and a number of third-party components. We can only get the level of productivity we expect by reusing code that has already been written. An operation that requires at least 5,000 or 10,000 lines of code, if it has to be created manually, may take only 5 or 10 lines of code if a suitable tool or third-party component is available. But whether a particular tool can do the job often depends on subtle distinctions in the client s requirements. This means that the lines of code and duration estimates can vary wildly, depending on whether the functionality has to be created from scratch. Since technology experience is mostly out-of-date (characteristic #7), a large proportion of the tools will be new to the developers, and their applicability in a given context can only be determined by experience. All too often, this is by bitter experience, when a project exceeds its estimates due to unforeseen limitations and problems in the new technology.

Accessing EJB 2.x Components with Spring s Support With Spring s support, accessing an EJB component can be significantly simplified. You can access an EJB component by its business interface. A business interface differs from an EJB remote interface in that it doesn t extend EJBObject, and its method declarations don t throw RemoteException, which means that the client doesn t have to handle this type of exception, and it doesn t know that the service is implemented by an EJB component. The business interface for postage calculation is shown following: package com.apress.springrecipes.post; public interface PostageService { public double calculatePostage(String country, double weight); } Now, in FrontDeskImpl, you can define a setter method for the PostageService business interface to let Spring inject the service implementation so that your FrontDeskImpl will no longer be EJB specific. Later, if you reimplement the PostageService interface with another technology, you won t need to modify a single line of code. package com.apress.springrecipes.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 proxy factory bean SimpleRemoteStatelessSessionProxyFactoryBean to create a local proxy for a remote stateless session bean. <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-2.5.xsd"> <bean id="postageService" class="org.springframework.ejb.access. SimpleRemoteStatelessSessionProxyFactoryBean"> <property name="jndiEnvironment"> <props> <prop key="java.naming.factory.initial"> org.apache.openejb.client.RemoteInitialContextFactory

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Note To use Hibernate as the underlying JPA engine, you have to include hibernate-entitymanager.jar and jboss-archive-browsing.jar (located in the lib/hibernate directory of the Spring installation) in your classpath. Because Hibernate EntityManager depends on Javassist (http://www.jboss.org/javassist/), you also have to include javassist.jar in your classpath. If you have Hibernate installed, you should find it in the lib directory of the Hibernate installation. Otherwise, you have to download it from its web site.

</prop> <prop key="java.naming.provider.url"> ejbd://localhost:4201 </prop> </props> </property> <property name="jndiName" value="PostageServiceRemoteHome" /> <property name="businessInterface" value="com.apress.springrecipes.post.PostageService" /> </bean> <bean id="frontDesk" class="com.apress.springrecipes.post.FrontDeskImpl"> <property name="postageService" ref="postageService" /> </bean> </beans> You have to configure the JNDI details for this EJB proxy in the jndiEnvironment and jndiName properties. The most important is to specify the business interface for this proxy to implement. The calls to methods declared in this interface will be translated into remote method calls to the remote EJB component. You can inject this proxy into FrontDeskImpl in the same way as a normal bean. In Spring 2.x, EJB proxies can also be defined using the <jee:remote-slsb> and <jee:local-slsb> elements in the jee schema. You must add the jee schema definition to the <beans> root element beforehand. <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-2.5.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd"> <jee:remote-slsb id="postageService" jndi-name="PostageServiceRemoteHome" business-interface="com.apress.springrecipes.post.PostageService"> <jee:environment> java.naming.factory.initial= org.apache.openejb.client.RemoteInitialContextFactory java.naming.provider.url=ejbd://localhost:4201 </jee:environment> </jee:remote-slsb> ... </bean>

EJB 3.0 offers certain improvements on EJB 2.x. First, the EJB interface is a simple Java interface whose methods don t throw RemoteException, while the implementation class is a simple Java class annotated with EJB annotations. Moreover, the concept of home interface has been eliminated in order to simplify the EJB lookup process. You can look up an EJB reference from JNDI directly in EJB 3.0. However, the JNDI lookup code is still complex, and you also have to handle NamingException.

package com.apress.springenterpriserecipes.course.jpa; ... import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.EntityTransaction; import javax.persistence.Persistence; import javax.persistence.Query; public class JpaCourseDao implements CourseDao { private EntityManagerFactory entityManagerFactory; public JpaCourseDao() { entityManagerFactory = Persistence.createEntityManagerFactory("course"); } public void store(Course course) { EntityManager manager = entityManagerFactory.createEntityManager(); EntityTransaction tx = manager.getTransaction(); try { tx.begin(); manager.merge(course); tx.commit(); } catch (RuntimeException e) { tx.rollback();

By using Spring s JndiObjectFactoryBean, you can easily declare a JNDI object reference in the Spring IoC container. You can use this factory bean to declare a reference to an EJB 3.0 component.

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