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First of all, let s modify JpaCourseDao to accept an entity manager factory via dependency injection, instead of creating it directly in the constructor. package com.apress.springenterpriserecipes.course.jpa; ... import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class JpaCourseDao implements CourseDao { private EntityManagerFactory entityManagerFactory; public void setEntityManagerFactory( EntityManagerFactory entityManagerFactory) { this.entityManagerFactory = entityManagerFactory; } ... } The JPA specification defines how you should obtain an entity manager factory in Java SE and Java EE environments. In a Java SE environment, an entity manager factory is created manually by calling the createEntityManagerFactory() static method of the Persistence class. Now let s create a bean configuration file for using JPA (e.g., beans-jpa.xml in the classpath root). Spring provides a factory bean, LocalEntityManagerFactoryBean, for you to create an entity manager factory in the IoC container. You must specify the persistence unit name defined in the JPA configuration file. You can also declare a JpaCourseDao instance under Spring s management. <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"> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> <property name="persistenceUnitName" value="course" /> </bean>

The activity duration estimates are used as an input to the schedule development task, which is the last step in the time management process. This is where a lot of the heavy lifting in project management is done, and a broad range of tools and techniques is available to plan and optimize a project s schedule.

package com.apress.springrecipes.post; import import import import import import import javax.jms.Connection; javax.jms.ConnectionFactory; javax.jms.Destination; javax.jms.JMSException; javax.jms.MapMessage; javax.jms.MessageProducer; javax.jms.Session;

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<bean id="courseDao" class="com.apress.springenterpriserecipes.course.jpa.JpaCourseDao"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> </beans> Now you can test this JpaCourseDao instance with the Main class by retrieving it from the Spring IoC container. package com.apress.springenterpriserecipes.course; ... import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("beans-jpa.xml"); CourseDao courseDao = (CourseDao) context.getBean("courseDao"); ... } } In a Java EE environment, you can look up an entity manager factory from a Java EE container with JNDI. In Spring, you can perform a JNDI lookup by using the <jee:jndi-lookup> element. <jee:jndi-lookup id="entityManagerFactory" jndi-name="jpa/coursePU" /> LocalEntityManagerFactoryBean creates an entity manager factory by loading the JPA configuration file (i.e., persistence.xml). Spring supports a more flexible way to create an entity manager factory by another factory bean, LocalContainerEntityManagerFactoryBean. It allows you to override some of the configurations in the JPA configuration file, such as the data source and database dialect. So, you can take advantage of Spring s data access facilities to configure the entity manager factory. <beans ...> ... <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="org.apache.derby.jdbc.ClientDriver" /> <property name="url" value="jdbc:derby://localhost:1527/course;create=true" /> <property name="username" value="app" /> <property name="password" value="app" /> </bean>

import org.apache.activemq.ActiveMQConnectionFactory; import org.apache.activemq.command.ActiveMQQueue; public class FrontDeskImpl implements FrontDesk { public void sendMail(Mail mail) { ConnectionFactory cf = new ActiveMQConnectionFactory("tcp://localhost:61616"); Destination destination = new ActiveMQQueue("mail.queue"); Connection conn = null; try { conn = cf.createConnection(); Session session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE); MessageProducer producer = session.createProducer(destination); MapMessage message = session.createMapMessage(); message.setString("mailId", mail.getMailId()); message.setString("country", mail.getCountry());

message.setDouble("weight", mail.getWeight()); producer.send(message); session.close(); } catch (JMSException e) { throw new RuntimeException(e); } finally { if (conn != null) { try { conn.close(); } catch (JMSException e) { } } } } } In the preceding sendMail() method, you first create JMS-specific ConnectionFactory and Destination objects with the classes provided by ActiveMQ. The message broker URL is the default for ActiveMQ if you run it on localhost. In JMS, there are two types of destination: queue and topic. Queue is for the point-to-point communication model, while topic is for the publish-subscribe communication model. As you are sending JMS messages point to point from front desk to back office, you should use a message queue. You can easily create a topic as a destination using the ActiveMQTopic class. Next, you have to create a connection, session, and message producer before you can send your message. There are several types of messages defined in the JMS API, including TextMessage, MapMessage, BytesMessage, ObjectMessage, and StreamMessage. MapMessage contains message content in key/value pairs like a map. In the meantime, you have to handle JMSException, which may be thrown by the JMS API. Finally, you must remember to close the session and connection to release system resources. Every time a JMS connection is closed, all its opened sessions will be closed automatically. So, you only have to ensure that the JMS connection is closed properly in the finally block. On the other hand, the following BackOfficeImpl class receives JMS messages with the JMS API directly: package com.apress.springrecipes.post; import import import import import import import javax.jms.Connection; javax.jms.ConnectionFactory; javax.jms.Destination; javax.jms.JMSException; javax.jms.MapMessage; javax.jms.MessageConsumer; javax.jms.Session;

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