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

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Q151. Is it possible to configure more than one config file in struts ?

Struts

Ans. Yes

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Q152. 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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Q153. Implement a Stack with 2 threads in which one thread push data and another pop data.

Data Structure

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Q154. 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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Q155. what is the testcase technique

Testing

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Q156. what are the different status of a defect in Jira ?

Jira

Ans. Open, In Progress, Reopened, Closed, Resolved

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Q157. what is the difference between RC and webdriver

WebDriver

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Q158. What is the name of DNS service provided by AWS ?

Amazon Web Services (AWS)

Ans. Route 53

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Q159. Difference between List and ArrayList ?

Core Java

Ans. List is an interface whereas ArrayList is an implementation of List.

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Q160. Describe AWS VPC and subnets.

Amazon Web Services (AWS)

Ans. VPC stands for Virtual Private Cloud. You can define a VPC and subnets for a region in AWS and that can be used to access shared resources on the cloud. For eg: API gateway to access any file on S3.

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Q161. Can constructors be final ?

Core Java

Ans. No. They are never inherited and therefore are not subject to hiding or overriding.

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Q162. Can a constructor be declared static ? Why ?

Core Java

Ans. No.

When we declare a method static, it means that "this belongs to class as whole and not particular instance". The whole purpose of constructor is to initialize a object and hence there is no sense having static constructor.

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Q163. Difference between interface and inheritance

Core Java

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Q164. JWT internal working

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Q165. What are the best strategies to improve code readability ?

General

Ans. https://dzone.com/articles/10-tips-how-to-improve-the-readability-of-your-sof

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Q166. Rest API crud operation using spring boot

Spring Boot

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Q167. Hash map using/without using Java 8

Core Java

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Q168. How to deploy spring boot application without restart in prod env

Spring Boot

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Q169. differences between drop , delete and truncate

Database

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Q170. Can you explain integration between Spring and Hibernate ?

Hibernate

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