Application server@ejb
An application server is an application program that accepts connections in order to service requests, by sending back responses. An application server can run remotely(connected to client through a computer network) or can exist on the same computer where the client application is running.
Examples:
- File server
- Database server
- Backup server
- Web server
- FTP server
- Application server
- VPN server
- DHCP server
- DNS server
- WINS server
- Logon server
- Security server
- Domain controller
- Backup domain controller
- Proxy server
- Firewall
Application server are developed to support the quick development of the enterprise model. They provide security and state maintenance with the database persistence.
An application server may be a part of a three tier architecture model. A three tier architecture includes the client tier, Middle tier and the EIS(Enterprise information system) tier.
The view tier: is nothing but the web based graphical user interface to interact with the clients.
Middle tier: is the combination of web containers and the ejb containers.
EIS tier: EIS contains persistence and the database management system to support the applications.
J2EE platform requires database to store the business data. This database is accessible by means of JDBC, JDO or SQLJ APIs. We can also access the database through enterprise beans, we components and the application client components.
- Posted in: J2EE
- Tagged: application server, ejb, intro_ejb
