Java EE - Interview Questions and Answers for 'Java EE' | Search Interview Question

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Q31. In this url

http://javasearch.buggybread.com/InterviewQuestions/questionSearch.php?searchOption=label&keyword=url

What is protocol , domain , path and query param ?

Java EE

Ans. the web URI starts with the protocol which is http in this case, javasearch.buggybread.com is the domain in this case which is a subdomain of buggybread.com, /InterviewQuestions is the path, questionSearch.php is the resource, searchOption and keyword are query params.

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Q32. What is the character limit of url and doesn it apply to GET and POST Requests ?

Java EE

Ans. Its 2048 and Yes it applies to get request but not POST. As in Get Request , elements are passed as part of the url, this limit applies to Get requests.

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Q33. What does the web status code 404,500 and 200 mean ?

Java EE

Ans. 404 means the resource is not found on the server.The resource might not be deployed correctly.

500 means internal server error which means that resource was located but then it resulted in some exception or error.

200 means Ok.

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Q34. What is a web service ?

Java EE

Ans. A Web service is a service offered by one system to another, for communication over web through http. XML are JSON are usually used for sending across information from one system to another.

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Q35. What is the difference between http and https ?

Java EE

Ans. https encrypts the data using SSL whereas http sends it as plain text, So https is secure protocol whereas http is not.

Moreover https connects on port 443, while HTTP is on port 80

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Q36. Explain some of the http status codes you know ?

Java EE

Ans. 500 is Internal Server Error

404 is resource not found

400 is Bad Request

403 is Forbidden

401 is Unauthorized

200 is OK

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Q37. 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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Q38. What are different ways for Servlet authentication ?

Java EE

Ans. HTTP Basic Authentication
HTTP Digest Authentication
HTTPS Authentication
Form Based Login

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Q39. Can we convert a numeric IP address to a web host name ?

Java EE

Ans. Yes, using InetAddress.getByName("<IP Address>").getHostName();

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Q40. What is the difference between filter and filter-mappings xml tag within deployment descriptor ?

Java EE

Ans. filter tag speficies the filter name and respective class for handling filter action whereas filter mapping maps the filter to the url patterns ( specifying the url that needs to be intercepted )

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Q41. Have you heard of SiteMesh ?

Java EE

Ans. Sitemesh is a web page layout and decoration framework by OpenSymphony. SiteMeshFilter can intercept the requests and then build UI components (based on configuration) then renders the final page.

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Q42. What are the different J2EE modules ?

Java EE

Ans. 1. Application Client Module
2. Web Module
3. EJB
4. Resource Adapter

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Q43. What does the Web module contains ?

Java EE

Ans. JSP files, media files and deployment descriptor ( web.xml )

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Q44. Ho do you share / transfer variables between JSP pages ?

Java EE

^{This question was recently asked at 'UC Davis'.This question is still unanswered. Can you please provide an answer.}

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Q45. Which type of EJB can use bean pooling?

Java EE

Ans. Stateless Session Beans

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Q46. Difference between Include Directive and include action in jsp

Java EE

Ans. Include directive includes the file at translation time (the phase of JSP life cycle where the JSP gets converted into the equivalent servlet) whereas the include action includes the file at runtime.

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Q47. Difference between import and include directive in jsp

Java EE

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Q48. Which component of MVC you like to work on ?

Java EE

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Q49. Can we deploy an application to server using a jar file ?

Java EE

Ans. Conventionally we need a WAR file to be deployed to server. Though with Spring Boot we can even deploy using jar.

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Q50. What is a session bean ?

Java EE

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Q51. What is the difference between Java and J2ee ?

Java EE

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Q52. What is an applet ?

Java EE

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Q53. Is HttpServlet an abstract class ?

Java EE

Ans. Yes

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Q54. What is the need for filters in Java Servlets ?

Java EE

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Q55. Explain servlet lifecycle

Java 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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Q56. Is it front end code or the back end code , that drops the cookies ?

Java EE

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Q57. How can we drop cookies through back end code ? Does it transfer the cookie file to the client ?

Java EE

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Q58. Explain Servlet config

Java EE

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Q59. Which of the following http response means the resource is not found ?

Java EE

a. 500

b. 200

c. 404

d. 400

Ans.c. 404

Q60. Which of the following web status code means "Resource not found" ? Reference

Java EE

a. 500

b. 200

c. 401

d. 404

Ans.d. 404

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