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In the mapping file, you can specify a table name for this entity class and a table column for each simple property You can also specify the column details such as column length, not-null constraints, and unique constraints In addition, each entity must have an identifier defined, which can be generated automatically or assigned manually In this example, the identifier will be generated using a table identity column Each application that uses Hibernate requires a global configuration file to configure properties such as the database settings (either JDBC connection properties or a data source s JNDI name), the database dialect, the mapping metadata s locations, and so on When using XML mapping files to define mapping metadata, you have to specify the locations of the XML files By default, Hibernate will read the hibernatecfgxml file from the root of the classpath The middle extension cfg stands for configuration.

The third step in the time management process is activity duration estimating. It occurs right after activity sequencing. The individual activities are analyzed to estimate how long they will take. The PMBOK suggests that an estimate should originate from the individual most familiar with the nature of the specific activity.

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package com.apress.springrecipes.post; import javax.ejb.CreateException; import org.springframework.ejb.support.AbstractStatelessSessionBean; public class PostageServiceBean extends AbstractStatelessSessionBean implements PostageService { private PostageService postageService; protected void onEjbCreate() throws CreateException { postageService = (PostageService) getBeanFactory().getBean("postageService"); } public double calculatePostage(String country, double weight) { return postageService.calculatePostage(country, weight); } } When you extend the AbstractStatelessSessionBean class, your EJB class no longer needs to implement any EJB life cycle methods, but you can still override them if necessary. Note that this class has an onEjbCreate() method that you must implement to perform initialization tasks. Here, you just retrieve the postageService bean from the Spring IoC container for this EJB component to use. Of course, you must define it in a bean configuration file. This file can have an arbitrary name, but must be located in the classpath. For example, you can create it as beans-ejb.xml in the root of the classpath. <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="com.apress.springrecipes.post.PostageServiceImpl" /> </beans> The final step is to tell the EJB support class where your bean configuration is. By default, it looks at the JNDI environment variable java:comp/env/ejb/BeanFactoryPath for the file

If there is a hibernateproperties file on the classpath, that file will be consulted first <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 30//EN" "http://hibernatesourceforgenet/hibernate-configuration-30dtd"> <hibernate-configuration> <session-factory> <property name="connectiondriver_class"> orgapachederbyjdbcClientDriver </property> <property name="connectionurl"> jdbc:derby://localhost:1527/course;create=true </property> <property name="connectionusername">app</property> <property name="connectionpassword">app</property> <property name="dialect">orghibernatedialectDerbyDialect</property> <property name="show_sql">true</property> <property name="hbm2ddlauto">update</property> <mapping resource="com/apress/springenterpriserecipes/course/ Coursehbmxml" /> </session-factory> </hibernate-configuration> Before you can persist your objects, you have to create tables in a database schema to store the object data When using an ORM framework like Hibernate, you usually needn t design the tables by yourself If you set the hbm2ddlauto property to update, Hibernate can help you to update the database schema and create the tables when necessary Naturally, you shouldn t enable this in production, but it can be a great speed boost for development.

location. So, you add an environment entry to your EJB deployment descriptor for this location. <ejb-jar> <enterprise-beans> <session> <display-name>PostageService</display-name> <ejb-name>PostageService</ejb-name> <home>com.apress.springrecipes.post.PostageServiceHome</home> <remote>com.apress.springrecipes.post.PostageServiceRemote</remote> <ejb-class> com.apress.springrecipes.post.PostageServiceBean </ejb-class> <session-type>Stateless</session-type> <transaction-type>Bean</transaction-type> <env-entry> <env-entry-name>ejb/BeanFactoryPath</env-entry-name> <env-entry-type>java.lang.String</env-entry-type> <env-entry-value>beans-ejb.xml</env-entry-value> </env-entry> </session> </enterprise-beans> </ejb-jar> The EJB support classes instantiate the Spring IoC container using BeanFactoryLocator. The default BeanFactoryLocator they use is ContextJndiBeanFactoryLocator, which instantiates the IoC container using a bean configuration file specified by the JNDI environment variable java:comp/env/ejb/BeanFactoryPath. You can override this variable name by calling the setBeanFactoryLocatorKey() method in a constructor or in the setSessionContext() method. Now you can repack your EJB JAR file to include the preceding bean configuration file and redeploy it to your EJB container.

In EJB 2.x, you have to perform the following tasks to invoke a method on a remote EJB component. Invoking a method on a local EJB component is very similar, except that you have no need to handle RemoteException. Initialize the JNDI lookup context, which may throw a NamingException. Look up the home interface from JNDI, which may throw a NamingException. Retrieve a remote EJB reference from the home interface, which may throw a CreateException or a RemoteException. Invoke the method on the remote interface, which may throw a RemoteException.

Now let s implement the DAO interface in the hibernate subpackage using the plain Hibernate API Before you call the Hibernate API for object persistence, you have to initialize a Hibernate session factory (eg, in the constructor) package comapressspringenterpriserecipescoursehibernate; .. import orghibernateQuery; import orghibernateSession; import orghibernateSessionFactory; import orghibernateTransaction; import orghibernatecfgConfiguration;.

As you can see, it requires a lot of coding to invoke a method on an EJB component. The exceptions NamingException, CreateException, and RemoteException are all checked exceptions that you must handle. Moreover, your client is bound to EJB and would require a lot of changes if you ever switched the service implementation from EJB to another technology.

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