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An enterprise web application is a request response model.
The one who makes a request is called a client. The client can be made using the technologies html or javascript. The one who gives a response is called a server. The server can be made using the technologies "J2EE" or ".NET". Client sends a request to the server. Server does a processing on the request. And then server send backs a response.
Lets see some of the issues in this enterprise web application.
1. Server should be able to accept the request from the client. And should be able to send back the response.
2. Server should be able to do some transactions.
3. Server should be able to communicate with the database.
And many more.
Oracle developers have found this issues in an enterprise web application. And they have developed a container called "J2EE" . This J2EE container contains components like JSP/Servlet(for solving issue 1), EJB(for solving issue 2) and JDBC(for solving issue 3) and many more. This J2EE container also contains infrastructure code(example when client sends a request then j2ee should invoke the corresponding servlet/jsp).
So J2EE is a container. This container contains a set of components and infrastructure code. With this components and infrastructure code a developer can build the server side of the enterprise web application.
