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Servlets Interview Questions and Answers

Ques 21. The code in a finally clause will never fail to execute, right?

Using System.exit(1); in try block will not allow finally code to execute.

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Ques 22. What mechanisms are used by a Servlet Container to maintain session information?

Cookies, URL rewriting, and HTTPS protocol information are used to maintain session information

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Ques 23. Difference between GET and POST

In GET your entire form submission can be encapsulated in one URL, like a hyperlink. query length is limited to 260 characters, not secure, faster, quick and easy.
In POST Your name/value pairs inside the body of the HTTP request, which makes for a cleaner URL and imposes no size limitations on the form's output. It is used to send a chunk of data to the server to be processed, more versatile, most secure.

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Ques 24. What is session?

The session is an object used by a servlet to track a user's interaction with a Web application across multiple HTTP requests.

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Ques 25. What is servlet mapping?

The servlet mapping defines an association between a URL pattern and a servlet. The mapping is used to map requests to servlets.

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