Enterprise information system (EIS)

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Enterprise information system (EIS)

Enterprise information system (EIS)-tier software runs on the EIS server.

Although a Java EE application can consist of the three or four tiers shown in

, Java

EE multitiered applications are generally considered to be three-tiered applications because
they are distributed over three locations: client machines, the Java EE server machine, and the
database or legacy machines at the back end. Three-tiered applications that run in this way
extend the standard two-tiered client and server model by placing a multithreaded application
server between the client application and back-end storage.

Security

While other enterprise application models require platform-specific security measures in each
application, the Java EE security environment enables security constraints to be defined at
deployment time. The Java EE platform makes applications portable to a wide variety of
security implementations by shielding application developers from the complexity of
implementing security features.

The Java EE platform provides standard declarative access control rules that are defined by the
developer and interpreted when the application is deployed on the server. Java EE also provides

Application

Client

Java EE Application 1

Java EE Application 2

Dynamic

HTML Pages

Web Tier

Business Tier

Enterprise Beans

Database

JSP Pages

EIS Tier

Client Tier

Client
Machine

Java EE
Server

Database
Server

FIGURE 11

Multitiered Applications

Distributed Multitiered Applications

Chapter 1 · Overview