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Java EE - Interview Questions and Answers for 'Servlet' - 20 question(s) found - Order By Newest

 Q1. What is session tracking and how do you track a user session in servlets?Java EE
Ans. Session tracking is a mechanism that servlets use to maintain state about a series requests from the same user across some period of time. The methods used for session tracking are:

User Authentication - occurs when a web server restricts access to some of its resources to only those clients that log in using a recognized username and password

Hidden form fields - fields are added to an HTML form that are not displayed in the client's browser. When the form containing the fields is submitted, the fields are sent back to the server

URL rewriting - every URL that the user clicks on is dynamically modified or rewritten to include extra information. The extra information can be in the form of extra path information, added parameters or some custom, server-specific URL change.

Cookies - a bit of information that is sent by a web server to a browser and which can later be read back from that browser.

HttpSession- places a limit on the number of sessions that can exist in memory.

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   Like         Discuss         Correct / Improve     j2ee   servlets   session   session management   web applications   cookies   httpsession   url rewriting   architecture     Asked in 1 Companies


Frequently asked. Among first few questions in the J2EE segment of interview.
  Q2. What is deployment descriptor ?

or

What is the use of deployment descriptor ?
Java EE
Ans. Deployment Descriptor which is usually web.xml is used to specify the classes, resources and configuration of the application and how the web server uses them to serve web requests.This file is usually added to WEB-INF folder and contains following

* Servlet entries and url mapping
* Plugins
* Some info regarding authentication / filters
* Landing Page
* Event Handlers

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   Like         Discuss         Correct / Improve     web.xml   servlets  deployment descriptor     Asked in 15 Companies      basic        frequent

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 Q3. Can we have multiple servlets in a web application and How can we do that ?Java EE
Ans. Yes by making entries in web.xml

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   Like         Discuss         Correct / Improve     j2ee   servlets   servelets   web application   java   web.xml   yes-no   architecture


 Q4. Difference between socket and servlet ?Java EE
Ans. servlet is a small, server-resident program that typically runs automatically in response to user input.
A network socket is an endpoint of an inter-process communication flow across a computer network.

We can think of it as a difference between door and gate. They are similar as they both are entry points but they are different as they are put up at different areas.

Sockets are for low-level network communication whereas Servlets are for implementing websites and web services

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   Like         Discuss         Correct / Improve     java   j2ee   networking   servlet   socket   difference between.java.net   technologies   architecture


 Q5. What are different types of cookies ?Java EE
Ans. Session cookies , which are deleted once the session is over.

Permanent cookies , which stays at client PC even if the session is disconnected.

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   Like         Discuss         Correct / Improve     j2ee   servlets   session   session management   web applications   cookies   httpsession


 Q6. What is a Servlet Filter ?Java EE
Ans. It's an object that can intercept http request and response and hence we can take appropriate action on those requests.

There are different types of filters based on Specifications like

Authentication
Logging
Encryption
Tokenizing

etc

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   Like         Discuss         Correct / Improve     servlets  servlet filters     Asked in 3 Companies      basic        frequent


 Q7. What is servlet Chaining ?Java EE
Ans. Multiple servlets serving the request in chain.

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   Like         Discuss         Correct / Improve     java   web application   servlets     Asked in 1 Companies        rare


 Q8. What is a config Object?
Java EE
Ans. The config object is an instantiation of javax.servlet.ServletConfig and is a direct wrapper around the ServletConfig object for the generated servlet. This object allows the JSP programmer access to the Servlet or JSP engine initialization parameters such as the paths or file location.

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   Like         Discuss         Correct / Improve     j2ee   servlet   jsp   servlet config   servletconfig   javax


 Q9. What is a pageContext Object?
Java EE
Ans. The pageContext object is an instance of a javax.servlet.jsp.PageContext object. The pageContext object is used to represent the entire JSP page. This object stores references to the request and response objects for each request. The application, config, session, and out objects are derived by accessing attributes of this object.The pageContext object also contains information about the directives issued to the JSP page, including the buffering information, the errorPageURL, and page scope.

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   Like         Discuss         Correct / Improve     j2ee   servlet   jsp   pagecontext   page context


 Q10. What are the phases of the JSP life cycle ?Java EE
Ans. Translation of JSP PageCompilation of JSP PageClassloading (class file is loaded by the classloader)Instantiation (Object of the Generated Servlet is created).Initialization ( jspInit() method is invoked by the container).Reqeust processing ( _jspService() method is invoked by the container).Destroy ( jspDestroy() method is invoked by the container).

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 Q11. What are JSP directives ? What are different types of directives ?Java EE
Ans. The jsp directives are messages that tells the web container how to translate a JSP page into the corresponding servlet.

There are three types of directives -

page directive
include directive
taglib directive

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   Like         Discuss         Correct / Improve     j2ee   servlets   servelets   web application   jsp   jsp ldirectives


 Q12. What are advantages of using Servlets over CGI ?Java EE
Ans. Better Performance as Servlets doesn't require a separate process for a single request.

Servlets are platform independent as they are written in Java.

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 Q13. What is the use of HTTPSession in relation to http protocol ?Java EE
Ans. http protocol on its own is stateless. So it helps in identifying the relationship between multiple stateless request as they come from a single source.

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   Like         Discuss         Correct / Improve     j2ee   servlets   web application   session   httpsession   architecture     Asked in 1 Companies


 Q14. Why using cookie to store session info is a better idea than just using session info in the request ?Java EE
Ans. Session info in the request can be intercepted and hence a vulnerability. Cookie can be read and write by respective domain only and make sure that right session information is being passed by the client.

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   Like         Discuss         Correct / Improve     j2ee   servlets   session   session management   web applications   cookies   httpsession   architecture


 Q15. http protocol is by default ... ?Java EE
Ans. stateless

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 Q16. Are Servlet classes Thread Safe ?Java EE
Ans. No

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   Like         Discuss         Correct / Improve     servlets   j2ee    web


 Q17. What is the difference between ServletConfig and ServletContext ?Java EE
Ans. http://www.java4s.com/java-servlet-tutorials/difference-between-servletconfig-and-servletcontext-in-java/

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   Like         Discuss         Correct / Improve     ServletConfig  ServletContext     Asked in 1 Companies


 Q18. What are the advantages of Spring interceptor over Servlet Filters ?Spring
Ans. Spring Interceptor are Spring beans and hence they can inject other beans and can be used with other Spring frameworks concepts like AOP.

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 Q19. Explain servlet lifecycleJava EE
Ans. Init -> service -> destroy.

Out of these, init and destroy are called once per servlet whereas service is called every time when a request is made to the servlet.

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   Like         Discuss         Correct / Improve     servlet     Asked in 6 Companies


 Q20. Explain Servlet configJava EE
 This question was recently asked at 'Oracle financial services'.This question is still unanswered. Can you please provide an answer.


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