The Java EE platform uses a distributed multitiered application model for enterpriseapplications.
¦ Client-tier components run on the client machine.
¦ Web-tier components run on the Java EE server.
¦ Business-tier components run on the Java EE server.
¦ Enterprise information system (EIS)-tier software runs on the EIS server.
JavaEE multitiered applications are generally considered to be three-tiered applications becausethey are distributed over three locations: client machines, the Java EE server machine, and the database or legacy machines at the back end.
Client Machine--Client tier(Java applications or dynamic HTML pages)
v
JavaEE Server Machine--Web tier(JSP pages) +Business tier(Enterprice Beans)
v
Database server machine--EIS tier(database)
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