Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Administration Guide

Defining Application Server Instances

Application server instances form the basis of an application deployment. Each instance belongs to a single domain and has its own directory structure, configuration, and deployed applications. Each server instance also includes the J2EE platform web and EJB containers. Every new server instance must contain a reference to a node agent name defining the machine on which the instance will reside.

There are three types of server instances that can be created. Each server instance can only be of one type:

Figure 1–2 shows an application server instance in detail. The application server instance is a building block in the clustering, load balancing, and session persistence features of the Application Server Enterprise Edition.

Figure 1–2 Application Server Instance

Figure shows server instance features and how they communicate with various clients, databases, and other servers and systems.