A self-contained functional software unit supported bya container and configurable at deployment time. TheJ2EE specification defines the following J2EEcomponents: Application clients and applets are components that run on the client. Java servlet and Java Server Pages (JSP) technology components are Web components that run on the server. Enterprise JavaBeans (EJB) components (enterprise beans) are business components that run on the server. J2EEcomponents are written in the Java programming language and are compiled in the same way as any program in the language. The difference between J2EEcomponents and "standard" Java classes is that J2EEcomponents are assembled into a J2EE application, verified to be well formed and in compliance with theJ2EE specification, and deployed to production, where they are run and managed by the J2EE server or client container.
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