30 Important Servlets Interview Questions with Answers

1.     What is a servlet?

2.     What is the difference between Server and Container?

3.     What are the uses of Servlets?

4.     Why to use Servlet ?

5.     How does HTTP Servlet handle client requests?

6.     Is Servlets thread-safe?

7.     What are the advantages using servlets than using CGI?

8.     What is the difference between servlets and applets?

9.     Explain Servlet Life Cycle?

10. What is the importance of init() method in Servlet?

11. How service() method will handle requests ?

12. What is the importance of the destroy() method in Servlet?

13. Why there is no constructor in servlet?

14. Can we use the constructor instead of init() to initialize servlet?

15. How to start Servlet Automatically ?

16. Explain about ServletConfig Interface ?

17. What is ServletContext?

18. What is the difference between System.out & System.err output in a Servlet?

19. If a servlet is not properly initialized, what exception may be thrown?

20. Difference between ServletContext and ServletConfig?

21. What is the difference between request.getRequestDispatcher() and context.getRequestDispatcher()?

22. What is the use of setSecure() and getSecure() in Cookies?

23. What is use of parseQueryString ?

24. When init() and Distroy() will be called ?

25. How do servlets handle multiple simultaneous requests?

26. What is session tracking and how do you track a user session in servlets ?

27. What is Cookies and what is the use of Cookies ?

28. Why we are used setMaxAge() and getMaxAge() in Cookies ?

29. What is HTTP session in servlets ?

30. How to improve Servlet Performance ?

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