What is a J2EE component?
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Special icons for creating the user interface elements for thin clients
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A data module saved to the component area of the database.
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A self-contained functional software unit that is assembled into a J2ee application and interfaces with other application components
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A JAR file
A J2EE component is a self-contained, reusable software unit that is assembled into a J2EE application. Components like EJBs, servlets, and JSPs have defined interfaces and interact with other components through containers, enabling modular enterprise application development.
A J2EE component is a self-contained unit of functionality (such as a servlet, EJB, or JSP) that is built to the J2EE component contracts and assembled into a J2EE application, where it interacts with other components and container services. It's not just an IDE icon, a database module, or merely a packaging format like a JAR — those describe artifacts, not the component concept itself.