Interview Question

[Prakash Kumar M]

Recently i attended an interview with a MNC. I was asked few questions as below which made me to confuse and think

Question 1: How do you get the db connection and in what way you communicate to database from your project

I said, am using datasource that is registered with JNDI service and hence on look up i am getting the connection. However for the second part in the question, i was confused.

Please let me know how should be the good and professional answer for this question. I am also using EJB 2.0 in the application.

Question 2: In struts 1.x can i call the controller from model

I said, the action servlet will invoked on user request and hence the servlet will decide the forward path, form to be used, relative beans etc and also i drew a diagram representing the architecture of struts mvc model.

The diagram i drew was as similar in the below link

http://www.ibm.com/developerworks/websphere/techjournal/0304_barosa/images/image002.jpg

Please let me know by asking the above question, what does the interviewer expecting and how should my answer be more convincing

Question 3: What is the difference between doget and dopost request

I said, in

doget: user entered data is appended to the URL as query String. It can send only limited amount of data.

dopost: the user entered is not appended to the URL.It can send any amount of data.

The interviewer said that he wants more good answer and professional answer. Also asked me to think answer based on JVM.

I was confused. Please let me know how should i have convinced him.

Thanks in advance

[Seetharaman Venkatasamy]

Prakash Kumar M wrote:
Question 1: How do you get the db connection and in what way you communicate to database from your project

you are using Connection Pooling. thats fine. i think he expect exactly at what place you are getting the connection from Connection Pooling

Prakash Kumar M wrote:
Question 2: In struts 1.x can i call the controller from model

Normally, Controller should called by the Container . Programmer expected to code in the Controller by using Model(POJO).So Answare to this question is No.

Prakash Kumar M wrote:
Question 3: What is the difference between doget and dopost request

your anware was fine. Additionally, any updation Operation for the DB should call by doPost and querying[Fetching] the DB should call by doGet since doPost is a non-idempotent according to the Http 1.1 Specification.


Hope this helps

[Seetharaman Venkatasamy]

By the way:what is your interview result

[Sagar Rohankar]

Prakash Kumar M wrote:Question 3: What is the difference between doget and dopost request

I said, in

doget: user entered data is appended to the URL as query String. It can send only limited amount of data.

dopost: the user entered is not appended to the URL.It can send any amount of data.

The interviewer said that he wants more good answer and professional answer. Also asked me to think answer based on JVM.

For this question, I'll go with seetharaman answer and what does he mean by "think answer based on JVM." How JVM plays role in HTTP Request types ?

[Prakash Kumar M]

seetharaman and sagar thanks for your suggestion.

seetharaman wrote: i think he expect exactly at what place you are getting the connection from Connection Pooling

seetharaman, from the above information, you guess that the interviewer has expected me to tell if i have retrieved connection through any class file or dao. I did not understand please elaborate. Sorry if this is too basic

Also, as sagar said, even i was confused when the interviewer asked me to think the difference between doget,dopost with reference to jvm.

My interview results are not yet informed.