1. Lab 6 – EJB User Managment
Middleware Platforms
Lab 6 – EJB User Managment
Robert Sombrutzki
Contact: 1

2. Important Dates 2 weeks for lab 6 Next meeting: 14.02.2012
Start:
End:
Next meeting:

3. Lab 6 explained Enterprise JavaBeans Covered topics Environment
Entity-Beans
Session-Beans (stateful)‏
MessageDriven-Beans
Environment
Java 1.4 (5/6)‏
JBoss application server

4. Lab 6 explained

5. Lab 6 explained Simple Entity Bean(s)‏ Stateful Session Bean
User, Role, Phone, Address, Permission, Log
Stateful Session Bean
UserManager
Message Driven Bean
LoggerBean
Keys (IDs)
Log: time (Date)
Permission: objectId (long)
Role: name (String)
Address, Phone, User: id (int)

6. Lab 6 explained Entity Relationships
Role – Permission:
Role –
User –
User –

7. Lab 6 explained Phone Key @Id long areaCode;
@JoinColumn(name = "AREA_CODE")
long number;

8. Lab 6 explained Remove-Method
EntityManager em;
private void attachAndRemove(User user) {
user = em.merge(user);
em.remove(user); }
To remove an entity, you must use a managed instance
Object instance passed to method is called detached

9. Lab 6 explained Log Bean Logger Bean
ID: Time
Logger Bean
Implements interface MessageListener
Method: void onMessage(Message msg)
Messaging Model: Point-to-Point (Queue)
Annotation:
@MessageDriven(activationConfig={
@ActivationConfigProperty(propertyName="destinationType",
propertyValue="javax.jms.Queue"),
@ActivationConfigProperty(propertyName="destination",
propertyValue="queue/titan-LogEJBQueue")})‏
Slides: Asynchrones Messaging (S.5)

10. Lab 6 explained MessageQueue in UserManagerBean
@Resource(mappedName="java:/JmsXA")
private ConnectionFactory connFactory;
@Resource(mappedName="queue/titan-LogEJBQueue")
private Queue queue;
Connection cnn = connFactory.createConnection();
Session sess = cnn.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer mess = sess.createProducer(queue);
TextMessage textMsg = sess.createTextMessage();
textMsg.setText(message);
textMsg.setShortProperty("level", (short)level);
mess.send(textMsg);
cnn.close();
Slides: Asynchrones Messaging (S.1)