1. JAVA PLATFORMS
•J2SE – Java 2 Standard Edition  Java for the desktop / workstation
•
•J2ME – Java 2 Micro Edition  Java for the consumer device
•J2EE - Java 2 Enterprise Edition  Java for the server

2. J2ee J2se J2me

3. J2EE Supports
• Extensible Markup Language
• Web Applications
• Web Services Support / WSDL Standard Format
• UDDI and ebXML Standard Formats
• HTTP-SOAP Transport Protocol

4. •J2EE comes with a built in application server
•J2EE defines Java API for XML Processing (JAXP)
API for processing XML
•Uses SAX and DOM standards

5. •J2EE does not specify the nature and structure of
the runtime.
•J2EE Container – capability of the runtime to
manage application components.
•J2EE APIs specifies the contract between the
applications and the container.

6. Data
JDBC
RDBMS
Client Application Logic
JavaMail
Web Container Mail Server
HTML/
XML RMI
Servlets JSPs
J2EE
RMI/IIOP
JavaMail Application
JDBC
JNDI
Server
JMS
IIOP
JTA
JAF
Applet
EJB Container CORBA
Session Beans Entity Beans
JNDI
Client
Applica-
tion
RMI/IIOP
Directory Services
JavaMail
JDBC
JNDI
JMS
JMS
JTA
JAF

7. •The Component technologies – to hold the business logic. (JSP, Servlets and EJB)
•The Service technologies – to provide supported services to application
components (JDBC, JTA, JNDI)
•The Communication technologies – transparent to appln programmer, provide
the mechanism for communication among different parts of the appln.
(JMS, JavaMail, RMI-IIOP)
•They are re-usable software units containing business logic.
• An EJB is just a collection of Java classes and an XML file, bundled into a single
unit.

8. • They are re-usable software units containing business logic.
• An EJB is just a collection of Java classes and an XML file, bundled into a
single unit.
• Java classes must follow certain rules and provide certain callback
methods.

9. • Session Beans
• Entity Beans
• Message-driven Beans

10. • Intended for the use of a single client.
• Lifespan is limited to that of its client.
• When the client leaves the web site or the application is shut down, the
session bean disappears.

11. Can keep information on behalf of its client across method calls.
For example,
Full information of the client is stored in every transactions
example , credit card

12. • This bean implements a particular business logic, though its
created for a particular client, it doesn’t have to remember anything
about the client.
• Can be considered as a remote procedure that gets executed on
behalf of the client, taking some parameters and returns the result
(of calculation in a particular business rule context).

13. •Persistence is its basic property.
•It stays around even after the program is terminated until it is deleted.
•When the program is restarted, it can gain access to this bean again.
•It can be used by any program on the network.
•It is executed remotely.
•It is identified by a primary key.
•Its nothing but the object representation of records in RDBMS tables.

14. Advantages
• J2EE provides a complete architecture for developing
- Distributed systems including object persistence, session tracking,
transaction management, …
•Separation of technical and application-specific code
- Deployment descriptors
- Container Managed Persistence

15. Disadvantages
• Very complex technology
Even simple examples require many interfaces, bean classes, deployment
descriptors.
• Many errors occur only at runtime (several steps required until the application is
running)
- Compilation
- Packaging
- Deployment
- Running the application

16. A Web Application Framework (WAF) is a
reusable, skeletal, semi-complete modular platform
that can be specialized to produce custom web
applications , which commonly serve the web browsers
via the Http's protocol.
WAF usually implements the Model-View-Controller
(MVC) design pattern, typically in the Model 2
architecture to develop request-response web-based
applications on the Java EE and .NET models.

18. Request-based Framework :
Struts
WebWork
Beehive , Stripes
Component-based Framework
Jave Server Faces (JSF)
Tapestry
Wicket
Hybrid – Meta Framework
RIFE
Spring Framework
RIA-based Framework
DWR
Echo2
JSON-RPC-Java