JEE Programming - 07 EJB Programming

Module 07 - Enterprise JavaBeans
Danairat T.
Line ID: Danairat
FB: Danairat Thanabodithammachari
+668-1559-1446

JEE and Web Application Development
The Course Outline
Module 01 - Introduction to JEE
Module 02 - The JEE Containers
Module 03 - The Model-View-Controller Design Pattern
Module 04 - Java Servlets
Module 05 - Java Server Pages in MVC
Module 06 - JEE Web Application Deployment
Module 07 - Enterprise JavaBeans
Module 08 - JEE Enterprise Application Deployment

Enterprise JavaBeans
A server-side component that
encapsulates the business logic of
an application. The business logic
is the code that fulfills the purpose
of the application.
Enterprise beans simplify the development of
large, distributed applications. Developer can
concentrate on solving business problems.

EJB as a Model in MVC
Servlet/
JSF
JSP/JSF
EJB
1. Request
5. Response
2. Access
3. Access
4. Forward
Web Container EJB Container
JEE Server

When to use EJB
• The application must be scalable. To accommodate a
growing number of users, you may need to distribute an
application’s components across multiple machines. Not
only can the enterprise beans of an application run on
different machines, but also their location will remain
transparent to the clients.
• Transactions must ensure data integrity. Enterprise beans
support transactions, the mechanisms that manage the
concurrent access of shared objects.
• The application will have a variety of clients. With only a
few lines of code, remote clients can easily locate
enterprise beans. These clients can be thin, various, and
numerous.
• Requiring of Individual Component Monitoring
• Standard Pluggable Security

EJB Type
Enterprise Bean Type Purpose
Session
Performs a task for a client; optionally
may implement a web service
Message-Driven
Acts as a listener for a particular
messaging type, such as the Java
Message Service API

EJB Message-Driven Bean Life Cycle

EJBs in Deployment File Structure
EJB JAR File

Hands-on Lab: Creating Basic EJB

1. Click “New Application ” 2. Select “Java EE Web Application”, Click “OK”

3. Enter Application Name 4. Click “Finish”

5. Click “New ” from “Model” project 6. Select “Session Bean”, click “OK”

7. Enter EJB Name, click “Next” 8. Click “Next”

9. Click “Next” 10. Click “Finish”

11. Click “New Method ” from “Enterprise JavaBeans EJB”

12. Enter “Name”, click “OK” 13. You will see the new EJB method shown in the code

14. Make change the code

Creating EJB Client
15. Click “”New Simple Java Client from
the EnterpriseBean
16. Click “OK”

Creating EJB Client
17. Make change to the code

Start EJB Container
18. Click “Run” from the EnterpriseBeans

Start EJB Container
19. See Container started

Run the EJB Client
20. Click “Run” from the EJB Client

Run the EJB Client
21. You will see the result from EJB in the message window.

Hands-on Lab: Creating EJB, Servlet
invokes remote EJB and local EJB

Hands-on Lab: Creating EJB, Servlet invokes remote EJB and local EJB
Creating New Application
1. Click “New Application..” 2. Select “Java EE Web Application”, Click “OK”

5. Click “New” from “Model” project 6. Click “Session Bean”

7. Click “Next” 8. Click “Next”

11. Click “New Method ” from “Enterprise JavaDeans”

12. Enter Beans method details 13. You will see the code

Adding Dependencies to ViewController project
15. Select “Project Properties” from ViewController 16. Click “Edit Dependencies”

Adding Dependencies to ViewController project
17. Check “Build Output” 18. Click “OK”

Creating Servlet invoking Remote EJB
19. Click “New” on ViewController” project 20. Click “HTTP Servlet”

21. Enter Servlet Name 22. Click “OK”

23. Click “Finish” 24. Review the import classes for the Servlet

25. Create method in Servlet to get InitialContext of remote EJB Container

26. Make change into the code

27. Click “Run” the servlet

28. The EJB result shown on the WebBrowser

Creating Servlet invoking Local EJB
29. Click “Open” on the “web.xml” 30. Click “New on Existing EJB” from the “EJB References”

31. Click “OK” 32. Click “Save”

33. Review the web.xml code

34. Click “New..” from “ViewController” 35. Select “HTTP Servlet”, click “OK”

36. Enter Servlet Name 37. Click “Next”

38. Click “Finish” 39. Review the import classes

40. Make change the code

41. Click “Run”

42. You will see the EJB result on the Web Browser.

Hands-on Lab: Creating EJB,
DataSource, Data Object,
Servlets, HTTP Session,
RequestDispatcher and JSP

Hands-on Lab: Creating EJB DataSource, Data Object, Servlets, HTTP
Session, RequestDispatcher and JSP
1. Click “New Application..” 2. Select “Java EE Web Application”, Click “OK”

Configuring Project Dependencies
5. Select “Project Dependencies” from “ViewController” 6. Click “Edit Dependencies”

7. Check “Build Output” 8. Click “OK”

9. Finish configuring the project dependencies

Configuring Data Object
10. Click “New” from the “Model” project 11. Select “Class”, click “OK”

12. Enter information, click “OK”

13. Complete the Data Object by adding set, get methods for the variables

Creating EJB invoking DataSource
14. Click “New from “Model” project 15. Select “Session Bean”. Click “OK”

16. Enter EJB Name 17. Click “Next”

20 Review Import classes for EJB

21. Create method for get database connection from the Application Server Pool

Creating Servlet Controller
23. Clicl “New..” from “ViewController” 24. Select “HTTP Servler”, click “OK”

25. Click “New..” from “ViewController” 26. Click “Next”

17. Review import classes

18. Create method in Servlet to invoke EJB

19. Make change into the code

Creating JSP Form
20. Click “New” from “ViewController” 21. Select “JSP”, click “OK”

Creating JSP Form
22. Enter JSP Name
23. Make change into the code, click “Save”

Creating Result JSP
24. Enter JSP Name 25. Select “JSP”, click “OK”

Creating Result JSP
26. Enter JSP Name 27. Make change JSP code

Testing
28. Click “Run” on JSP Form “index.jsp” 29. See the server started

Testing
30. Enter “M” or others into the form, click “Search” 31. Search result shown on the Web Browser

Danairat T.
Line ID: Danairat
FB: Danairat Thanabodithammachari
+668-1559-1446
Thank you

JEE Programming - 07 EJB Programming

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