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J2EE Architecture

Java 2 Platform Enterprise Edition (J2EE) is the standard platform for developing enterprise applications such as ERP, CRM, and SCM.

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It can provide a component-based approach to designing, developing, assembling, and deploying enterprise applications. Since J2EE creates standard reusable modular components in a hierarchical structure, it reduces the difficulty of programming.

J2EE is a three-tier architectural application model.

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4 layers

1. Client Layer (Client)— Components running on the client. It supports a variety of clients, either a web browser or an app.
2. Web Layer (Server) — Components running on the J2EE server. It can respond to client requests and access components encapsulated with business logic.
3. Business Layer (EJB)— Component running on the J2EE server. It…