Simple java code for validating user in servlets

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The states are shown as ovals and the transitions between states as arrows.

Briefly, the Home oval is the entry (home) page that can be accessed without logging in.

Thus, a software developer may use a servlet to add dynamic content to a web server using the Java platform.As an example we will create simple web application with person editing form.Edited Person object will have first name, last name, e-mail and nested address object which will be represented by immutable Address class.The web container is responsible for managing the lifecycle of servlets, mapping a URL to a particular servlet and ensuring that the URL requester has the correct access rights.The Servlet API, contained in the Java package hierarchy is an object that receives a request and generates a response based on that request.

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