There are a number of advantages of using servlets over related technologies, such as CGI-based applications and proprietary Web server extensions. Let’s go over them, one by one.
The first advantage is security. Servlets are called within the server context so they have all the security of the server itself. They’re hidden from view and transmission, giving less chance for secure information to fall into the wrong hands.
Servlets provide secure connections to the back-tier with more control than previous applications and may use native security features. But the privileges of servlets can be restricted using Access Control Lists that permit only certain users or groups of users to have access to them.
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