Interview Questions and Answers for 'Web' | Search Interview Question

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Q121. Which Web and Application server is being used by your application ?

Server

Ans. We are using Apache 2.3 and Tomcat 5.6

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Q122. 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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Q123. What does the Web module contains ?

Java EE

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

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Q124. How Access control Policies are implemented in WCS ?

IBM WCS

Ans. There are three elements i.e Users ( Who want access ) , Actions ( What kind of Access ) and Resources ( Whose Access ). The relationship between resource and user is store in ACRELATION table and ACRESREL associate a resource and relationship.

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Q125. What are the tables used for Access control ?

IBM WCS

Ans. ACPOLICY , ACPOLDESC , ACACTION , ACRELATION , ACRESREL , ACRESGRP

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Q126. Who manages the Access control policies and How ?

IBM WCS

Ans. Site Administrator and through Org Admin Console.

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Q127. What are the design patterns used in WCS ?

IBM WCS

Ans. MVC , Display Design and Command.

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Q128. What is reload interval and where it is defined ?

IBM WCS

Ans. reload interval or jsp caching interval is a parameter that indicates how frequently a JSP should be recompiled.

It is defined within

Stores.warWEB-INFibm-web-ext.xmi

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Q129. What information is stored in CACHEIVL table and How does this help in caching ?

IBM WCS

Ans. This table records the changes to product or category information in the database. This is referred by WCS for invalidating dynacache.

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Q130. What are the different types of Auctions in WCS ?

IBM WCS

Ans. open cry, sealed bid, and dutch

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Q131. Can we schedule auctions and promotions in WCS ?

IBM WCS

Ans. Yes

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Q132. How do we set Auctions in WCS ?

IBM WCS

Ans. Through Accelerator.

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Q133. What is SKU ?

IBM WCS

Ans. SKU is Stock keeping unit. Items are referred to as SKU as they are the narrowest identifier for which business needs to track quantity.

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Q134. Why can't we add Products while specifying Target Catalog entry in Promotions?

IBM WCS

Ans. Product refer to category of Items and hence can't be associated to a particular Stock keeping unit. Items can only be targeted while creating promotions.

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Q135. What is B2C and B2B Business model ?

IBM WCS

Ans. B2C business deals with selling merchandise directly to consumers whereas B2B business deals with selling / coordination with other businesses ( partners , distributors , affiliates etc ) for selling merchandise.

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Q136. Explain concept of Hubs and Extended site stores ?

IBM WCS

Ans. Hub and Extended sites /stores are used in case of selling through partners and affiliates. Hub is the central site around which extended stores are created by/for the respective partner / affiliate. Store owner performs the extended site administrations whereas overall control over merchandise remains with the site.

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Q137. What are eSpots and How do we manage them ?

IBM WCS

Ans. eSpot is the mechanism in WCS to schedule and display dynamic content. Content management for these slots are done through Accelarator.

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Q138. What are different Business Models supported by WCS ?

IBM WCS

Ans. B2C , B2B , Supply Chain , Extended Sites.

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Q139. Write a Program to validate an email address

Core Java

Ans. public class Class{
public static void main(String[] args){
String str = "xyz@123.com";

if(!str.contains("@") && !str.contains(".") && (str.indexOf('.') < str.indexOf('@'))){
System.out.println("Not a Valid Email Address");
}
}
}

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Q140. What is stub and skelton ?

SOAP

Ans. RMI uses a standard mechanism for communicating with remote objects i.e stubs and skeletons. A stub for a remote object acts as a client's local representative. The caller invokes a method on the local stub which is responsible for carrying out the method call on the remote object.

Stub resides at the client that upon calling whose method results in establishing connection with the server, serializing and mar shelling the request and then waiting for the response whereas skelton resides at the server that receives the request, unmarshal it and then deserialize to fulfil the request.

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Q141. What are the benefits of Rest services over using SOAP ?

Web Service

Ans. Rest services are light weight and hence facilitate faster development and involve less overheads compared to SOAP.

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Q142. How would you go about creating a get rest service if it requires multitude of params or inputs ?

Rest

Ans. If the number of input values is large, we can go about passing them as query params instead of path params. If the number is even larger and complex , its better to create a post service that behaves like a get service. Though this practice is not recommended but technically it can be accomplished.I dont mind doing it if the exceptionally large number of input would make it much more confusing.

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Q143. What is AWS or Amazon Web Services ?

Amazon Web Services (AWS)

Ans. These are the platforms or set of services provided by Amazon for cloud services , database storage , content delivery and other business applications and solutions.

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Q144. What are the different layers of cloud computing ?

Infrastructure

Ans. Paas - Platform as a service
Iaas - Infrastructure as a service
Saas - Software as a service

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Q145. If given a choice , which one would you prefer to send params to the Get service , path params or query param ?

Web Service

Ans. If the number of params is quite large , I would prefer to either split it with majority of it in query params or all in query params.

If the params are all mandatory , I would keep it as path params. If it's optional , I would keep it as query param so as to keep consistent base url.

If we don't require the param name , then they can be kept as path params as query params necessitates the usage of param name.

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Q146. Is it necessary to specify "employeeId" with @PathParam("employeeId") in this case,

@Path("/{employeeId}")
public String employeeInfo(@PathParam("employeeId") Long employeeId){
}

Rest

Ans. No, it's optional as the name of path param required is same as method param name in this case.

Even the declaration as following should work -

@Path("/{employeeId}")
public String employeeInfo(@PathParam Long employeeId){
}

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Q147. How do you take screenshot in selenium?

Selenium

Ans. TakeScreenshot th = TakeScreenshot(driver); //Enable the driver object to take screenshot

File src = th.getScreenShotAs(OutputType.FILE);

FileUtils.copyFilesrc("locationWhereUWantToPlaceTheScreenshot.jpg");

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Q148. What is Amazon EC2 ?

Amazon Web Services (AWS)

Ans. Amazon Elastic Compute Cloud or EC2 provides scalable computing capacity in the AWS cloud. It can be used to create Virtual Environments , storage and configure. EC2 enables to upgrade or downgrade infrastructure according to the rules defined ( with fluctuation in latency, traffic etc )

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Q149. What is the difference between latency, response time and processing time ?

Web Service

Ans. Latency is the delay incurred while communicating a message i.e the time took the message in transit over network.

processing time is the delay it took for the server to process the request.

Response time is the sum total of latency and processing time.

For example -

Let's say it takes 1 ms for the request to reach from client to server and similar 1 ms for the response to come back to client. Moreover it takes approx 10 ms for the application to process the request. So The response time would be outward latency + processing time + inward latency = 12 ms

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Q150. What is the difference between Elastic Compute Cloud and Elastic Beanstalk ?

Amazon Web Services (AWS)

Ans. EC2 is Amazon computing service whereas Elastic Beanstalk is the AWS service for deploying and managing web applications.

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