1
Agenda
1. Application servers
2. What is J2EE?
Main component types
Application Scenarios
J2EE APIs and Services
3. EJB – a closer look
4. Examples
Docsity.com
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Guidelines and tips
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Understanding J2EE Application Servers and EJBs: A Comprehensive Guide, Slides of Internet and Information Access
An in-depth exploration of j2ee application servers and enterprise javabeans (ejbs), including their benefits, main technologies, and real-life examples. Learn about the role of application servers in enterprise applications, the difference between j2ee-based and non-j2ee solutions, and the advantages of using ejbs for business logic. Discover the main j2ee products, such as bea weblogic, ibm websphere, and oracle 9ias, and explore the j2ee multi-tier model and various application scenarios.
Typology: Slides
2012/2013
1 / 52
This page cannot be seen from the preview
Don't miss anything!
Related documents
Partial preview of the text
Download Understanding J2EE Application Servers and EJBs: A Comprehensive Guide and more Slides Internet and Information Access in PDF only on Docsity!
1
Agenda
- Application servers
- What is J2EE? Main component types Application Scenarios J2EE APIs and Services
- EJB – a closer look
- Examples
2
1. Application Servers
- In the beginning, there was darkness and cold. Then, …
Centralized, non-distributed
terminals
mainframe
terminals
4
Application Servers
- Today, enterprise applications use the multi-tier model
5
Application Servers
- “Multi-tier applications” have several independent components
- An application server provides the infrastructure and services to run such applications
7
J2EE Application Servers
- Major J2EE products:
- BEA WebLogic
- IBM WebSphere
- Sun iPlanet Application Server
- Oracle 9iAS
- HP/Bluestone Total-e-Server
- Borland AppServer
- Jboss (free open source)
8
Web Server and Application Server
Web Server (HTTP Server)
App Server 1
App Server 2
Internet Browser
HTTP(S)
10
J2EE Benefits
- High availability
- Scalability
- Integration with existing systems
- Freedom to choose vendors of application servers, tools, components
- Multi-platform
11
J2EE Benefits
- Flexibility of scenarios and support to several types of clients
- Programming productivity:
- Services allow developer to focus on business
- Component development facilitates maintenance and reuse
- Enables deploy-time behaviors
- Supports division of labor
13
JSP
- Used for web pages with dynamic content
- Processes HTTP requests (non-blocking call-and- return)
- Accepts HTML tags, special JSP tags, and scriptlets of Java code
- Separates static content from presentation logic
- Can be created by web designer using HTML tools
14
Servlet
- Used for web pages with dynamic content
- Processes HTTP requests (non-blocking call-and-return)
- Written in Java; uses print statements to render HTML
- Loaded into memory once and then called many times
- Provides APIs for session management
16
J2EE Multi-tier Model
17
J2EE Application Scenarios
- Multi-tier typical application
19
J2EE Application Scenarios
- Web-centric application
20
J2EE Application Scenarios
- Business-to-business