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.

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