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Java 2 Platform, Enterprise Edition (J2EE) components are J2EE application parts installed on different client machines according to corresponding application tiers in the multitiered J2EE environment.
The four J2EE application components are: Client tier, Web tier, business tier and enterprise information system (EIS) tier.
A J2EE component is one of the self-contained functional units inside a J2EE application. It functions independently, bundled and/or when interacting with various J2EE components written in the Java language and executed like any other Java program. Combining respective classes and files facilitates communication between J2EE components in the same J2EE application.
Client tier components, such as application clients and applets, run on a client machine. Web and business tier components, such as Java servlets and Java server pages (JSP), run on a J2EE server. The EIS tier component runs on the EIS server.
J2EE component features are different from standard Java program features, as follows: