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Why Servlets Are Not Dead
With the advent of JSP, many people thought that was the end of the day for servlets. It turned out this was not the case. JSP did not displace servlets. In fact, in today’s real-world applications, both servlets and JSPs are used together. To understand why servlets did not become obsolete after the arrival of JSP, you need to understand the two design models upon which you can build your Java Web applications.
The first design model, simply called Model 1, was born right after the JSP was made available. Servlets are not normally used in this model. Navigating from one JSP to another is done by clicking the link in the page. The second design model is named Model 2. You will see shortly why Model 1 is not recommended and why Model 2 is the way to go.