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

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Q2491. What is XSS or Cross site scripting ?

Ans. XSS or cross site scripting is a javascript vulnerability in web applications. The easiest way to explain this is with a case when the user enters a script in the client side input fields and that input gets processed without getting validated. This leads to untrusted data getting saved and executed on the client side.

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Q2492. Explain Hibernate caching mechanism

Hibernate

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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Q2493. 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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Q2494. Does it make sense to mock integration calls during stress / load test ?

Testing

Ans. No, its usually not done.

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Q2495. What are the 7 OSI LAYERS ?

Networking

Ans. Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical

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Q2496. Implement a Stack with 2 threads in which one thread push data and another pop data.

Data Structure

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

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Q2497. Can you tell me any 10 unix command you have worked with ?

Unix

Ans. grep, ls, kill, vi , scp , wget,telnet, zip, unzip,mv,cp

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Q2498. Can we create object in static block ?

Core Java

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

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Q2499. What are the different ways to create objects in Java ?

Core Java

Ans. 1. Using new operator
3. Using Class.forName or Reflection
4. Using clone
5. Using Deserialization

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Q2500. What will happen if there are no enums in Java ?

Core Java

Ans. Enums in Java is a facility to have objects upfront and use them as constants. Even if such a facility is not available , a workaround could be achieved.

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Q2501. What will happen if there are no collections in java ?

Core Java

Ans. Collections in Java is nothing but a library implementation for data structures and algorithm. If it's not available , we might have to include some other library or provide our own implementation.

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Q2502. What is input Stream ?

Core Java

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Q2503. Can comments be added in JSON ?

JSON

Ans. No, It should all be data.

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Q2504. How to calculate distance between 2 points using latitude longitude ?

Algorithm

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

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Q2505. Why did you apply for this position?

General

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

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Q2506. How to parse nested json object ?

JSON

Ans. JSONObject jsonChildObject = (JSONObject)jsonObject.get("LanguageLevels");

for (Map.Entry in jsonChildOBject.entrySet()) {
System.out.println("Key = " entry.getKey() ", Value = " entry.getValue());
}

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Q2507. Explain different inheritance mapping strategies with JPA / Hibernate.

Hibernate

Ans. table per hierarchy
table per concrete class
table per sub class

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Q2508. what is salesforce ?

SalesForce

Ans. Salesforce is the cloud based #1 CRM (Customer Relationship Management)

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Q2509. A customer has a website which is accessible over the Internet and he wants to secure the communication and decides to implement HTTPS instead of HTTP. He has configured EC2 instance behind an ELB. Where should you configure the SSL certificate?

Amazon Web Services (AWS)

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Q2510. With regards to VPC, what is the default maximum number of virtual private gateways allowed per region?

Amazon Web Services (AWS)

Ans. 5

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Q2511. What is elasticity in relation to Cloud infrastructure ?

Cloud Computing

Ans. The power to scale computing resources up and down easily with minimal friction

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Q2512. How many requests per second can Amazon CloudFront handle?

Amazon Web Services (AWS)

Ans. 10000

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Q2513. Which is the best approach that provides the lowest cost for Amazon elastic block store snapshots while giving you the ability to fully restore data?

aws ebs

Ans. Maintain the most current snapshot; archive the original and increment to Amazon Glacier.

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Q2514. Pascal Triangle Program

Ans. package snippet;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Pascal {
   public static void main(String[] args) {

      System.out.println(generatePascalTriangle(5));

   }

   static Map> generatePascalTriangle(int size) {
      Map> triangle = new HashMap<>();

      triangle.put(0, Arrays.asList(1));
      triangle.put(1, Arrays.asList(1, 1));

      for (int i = 2; i <= size; i ) {
         List coeffListForI = new ArrayList<>();
         List coeffListForI_1 = triangle.get(i - 1);
         coeffListForI.add(1);
         for (int j = 0; j <= coeffListForI_1.size() - 2; j ) {
            coeffListForI.add(coeffListForI_1.get(j) coeffListForI_1.get(j 1));
         }
         coeffListForI.add(1);
         triangle.put(i, coeffListForI);
      }

      return triangle;
   }
}

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Q2515. What is Queue ?

Data Structure

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

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Q2516. What is the objective of enabling versioning on a s3 bucket ?

Amazon Web Services (AWS)

Ans. So that it doesn't overwrite the existing file with the same name and maintain versioning of it.

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Q2517. Which IAM policy condition key should be used if you want to check whether the request was sent using SSL?

Amazon Web Services (AWS)

Ans. AWS: secure transport

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Q2518. Which AWS service is a task coordinator and state management service for cloud applications.

Amazon Web Services (AWS)

Ans. Amazon SWF

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Q2519. What are the IP address mechanisms supported by ELB?

Amazon Web Services (AWS)

Ans. IPv4 and IPv6

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Q2520. Which ELB component is responsible for monitoring the Load Balancers?

Amazon Web Services (AWS)

Ans. Controller Service

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