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HCL Group Java Developer Interview Questions, Process, and Tips

Updated 20 Oct 2024

Top HCL Group Java Developer Interview Questions and Answers

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HCL Group Java Developer Interview Experiences

4 interviews found

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Naukri.com and was interviewed in Aug 2024. There was 1 interview round.

Round 1 - Technical 

(9 Questions)

  • Q1. Transactions in springboot
  • Ans. 

    Transactions in Spring Boot manage database operations as a single unit of work to ensure data integrity.

    • Spring Boot provides support for declarative transaction management using @Transactional annotation.

    • Transactions can be configured at class or method level.

    • Transactions can be rolled back in case of exceptions to maintain data consistency.

    • Example: @Transactional annotation on a service method ensures that all databa...

  • Answered by AI
  • Q2. Difference between arraylist and linked list
  • Ans. 

    ArrayList is resizable array implementation, LinkedList is doubly linked list implementation.

    • ArrayList uses dynamic array to store elements, LinkedList uses doubly linked list.

    • ArrayList is faster for accessing elements by index, LinkedList is faster for adding/removing elements.

    • Example: ArrayList arrList = new ArrayList<>(); LinkedList linkedList = new LinkedList<>();

Answered by AI
  • Q3. How REST API used
  • Ans. 

    REST API is used to communicate between client and server using HTTP methods like GET, POST, PUT, DELETE.

    • REST API allows clients to access and manipulate resources on a server using standard HTTP methods.

    • It uses URLs to identify resources and HTTP methods to perform actions on those resources.

    • Common HTTP methods used in REST API are GET (retrieve data), POST (create data), PUT (update data), DELETE (remove data).

    • REST A...

  • Answered by AI
  • Q4. Annotations in springboot
  • Ans. 

    Annotations in Spring Boot are used to provide metadata about the application and its components.

    • Annotations are used to configure Spring Boot applications, define beans, handle requests, etc.

    • Examples include @SpringBootApplication, @RestController, @Autowired, @RequestMapping, etc.

  • Answered by AI
  • Q5. Features of java 8
  • Ans. 

    Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods in interfaces.

    • Lambda expressions allow for more concise code and enable functional programming.

    • Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

    • Streams provide a way to work with collections of objects in a functional style.

    • Default methods in interfaces ...

  • Answered by AI
  • Q6. How interface is implemented in java
  • Ans. 

    Interfaces in Java are implemented using the 'implements' keyword, allowing classes to provide specific implementations for methods defined in the interface.

    • Interfaces in Java define a contract for classes to implement, specifying method signatures without implementations.

    • A class can implement multiple interfaces by separating them with commas.

    • Classes implementing an interface must provide concrete implementations for ...

  • Answered by AI
  • Q7. How stream API works
  • Ans. 

    Stream API in Java provides a way to process collections of objects in a functional style.

    • Stream API allows for functional-style operations on collections like map, filter, reduce, etc.

    • It supports lazy evaluation, meaning operations are only performed when needed.

    • Streams can be sequential or parallel, depending on the source and operations used.

  • Answered by AI
  • Q8. Benefits of springboot over spring
  • Ans. 

    Spring Boot simplifies the setup and development of Spring applications by providing a convention-over-configuration approach.

    • Spring Boot eliminates the need for XML configuration by using annotations and sensible defaults.

    • It includes embedded servers like Tomcat, Jetty, or Undertow, making it easy to deploy standalone applications.

    • Auto-configuration feature reduces the amount of boilerplate code needed to set up a Spr...

  • Answered by AI
  • Q9. Difference between throw and throwable
  • Ans. 

    throw is a keyword used to explicitly throw an exception, while Throwable is a class that serves as the base class for all exceptions in Java.

    • throw is used to throw an exception in a method, while Throwable is the superclass of all exceptions in Java.

    • throw is followed by an instance of Throwable class or its subclasses, while Throwable is a class that provides common methods for handling exceptions.

    • Example: throw new N...

  • Answered by AI

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Try to speak about one topic of more time it will increase the time of interview.

    Skills evaluated in this interview

    Interview experience
    4
    Good
    Difficulty level
    -
    Process Duration
    -
    Result
    -
    Round 1 - HR 

    (2 Questions)

    • Q1. Good interview in java
    • Q2. Good interview in java1
    Round 2 - HR 

    (2 Questions)

    • Q1. Ctc discussion also fine
    • Q2. Ctc discussion also fine1

    Interview Preparation Tips

    Interview preparation tips for other job seekers - good company

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    I applied via Naukri.com and was interviewed in Feb 2022. There was 1 interview round.

    Round 1 - Technical 

    (1 Question)

    • Q1. Basic Java Question on Streams Understanding of your current project. How you projects works end to end. Spring Boot basic knowledge. You should be able explain your project and your roles and responsibili...

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Keep your resume clean with not extra ordinary statements.
    Mention only those tech stack on which you have knowledge and experience.

    I applied via Naukri.com and was interviewed in Nov 2021. There were 2 interview rounds.

    Round 1 - Assignment 

    Java MCQ questions

    Round 2 - One-on-one 

    (1 Question)

    • Q1. Knowledge on Java language

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Believe in your self . Try untill you win

    HCL Group interview questions for designations

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     (1)

     Senior Java Developer

     (1)

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     (1)

     Software Developer

     (7)

     Salesforce Developer

     (2)

     Tableau Developer

     (2)

     ETL Developer

     (2)

     Senior Developer

     (1)

    Interview questions from similar companies

    Interview experience
    5
    Excellent
    Difficulty level
    Easy
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected
    Round 1 - Technical 

    (2 Questions)

    • Q1. Previous projects
    • Q2. Spring boot annotations
    Round 2 - One-on-one 

    (2 Questions)

    • Q1. Coding round swap two numbers without using third variable
    • Q2. Salary expectations
    Interview experience
    1
    Bad
    Difficulty level
    Easy
    Process Duration
    Less than 2 weeks
    Result
    Not Selected

    I was interviewed in Feb 2025.

    Round 1 - Coding Test 

    Coding was conducted using Java.

    Round 2 - One-on-one 

    (1 Question)

    • Q1. The management is really bad... I had multiple call with the HR they jever mentioned about industrial experience excluding internship. I cleared the first round and in the second round they said they need ...

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Inquire multiple times regarding the job. Given that management is quite inadequate, they may not provide any information. Instead of wasting your time, seek clarity on the type of candidates they are interested in.
    Interview experience
    5
    Excellent
    Difficulty level
    Easy
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected

    I was interviewed in Dec 2024.

    Round 1 - Technical 

    (22 Questions)

    • Q1. API Gateway implementation
    • Ans. 

      API Gateway implementation is a centralized service that routes, manages, and secures API calls.

      • API Gateway acts as a single entry point for all API calls

      • It can handle authentication, rate limiting, caching, and request/response transformations

      • Examples include AWS API Gateway, Apigee, Kong

    • Answered by AI
    • Q2. Circuit breaker implementation
    • Ans. 

      Circuit breaker is a design pattern used to prevent system overload by temporarily stopping requests to a failing service.

      • Circuit breaker monitors requests to a service and opens when the service fails repeatedly.

      • It helps prevent cascading failures and allows the system to gracefully degrade.

      • Once the circuit breaker is open, it can periodically check if the service has recovered before allowing requests again.

    • Answered by AI
    • Q3. What is deadlock? How to avoid it?
    • Ans. 

      Deadlock is a situation in which two or more processes are unable to proceed because each is waiting for the other to release a resource.

      • Avoid circular wait by ensuring processes request resources in the same order.

      • Prevent hold and wait by requiring processes to request all needed resources at once.

      • Implement a timeout mechanism to break potential deadlocks.

      • Use resource allocation graphs to detect and prevent deadlocks.

      • ...

    • Answered by AI
    • Q4. Explain equals() method
    • Ans. 

      The equals() method is used to compare the contents of two objects for equality.

      • The equals() method is a method of the Object class in Java.

      • It is used to compare the contents of two objects for equality.

      • The default implementation of equals() in the Object class compares memory addresses, so it is often overridden in custom classes to compare content.

      • Example: String class overrides equals() method to compare the content

    • Answered by AI
    • Q5. How mongodb was integrated in your application?
    • Ans. 

      MongoDB was integrated in the application by using the official Java driver and configuring connection settings.

      • Used the official MongoDB Java driver to interact with the database

      • Configured connection settings such as host, port, database name, and authentication credentials

      • Implemented CRUD operations using MongoDB Java driver methods

      • Utilized MongoDB aggregation framework for complex queries

    • Answered by AI
    • Q6. What is hibernate?
    • Ans. 

      Hibernate is an open-source Java framework that simplifies the development of database interactions in Java applications.

      • Hibernate is an Object-Relational Mapping (ORM) tool that maps Java objects to database tables.

      • It provides a way to perform database operations using Java objects instead of writing SQL queries.

      • Hibernate handles the mapping of Java classes to database tables and vice versa, as well as the generation ...

    • Answered by AI
    • Q7. Runnable vs Callable interface
    • Ans. 

      Runnable is a functional interface with a single run() method, while Callable is a functional interface with a single call() method.

      • Runnable is used for tasks that do not return a result, while Callable is used for tasks that return a result.

      • Callable can throw checked exceptions, while Runnable cannot.

      • Callable returns a Future object, which can be used to retrieve the result of the computation.

      • Example: Runnable - execu...

    • Answered by AI
    • Q8. Which type of data is returned by Callable interface?
    • Ans. 

      The Callable interface in Java returns a Future object.

      • Callable interface returns a Future object which represents the result of a computation that may not be available yet.

      • The Future object can be used to retrieve the result of the computation, check if it is done, or cancel the computation.

      • Example: Callable<Integer> task = () -> { return 42; }

    • Answered by AI
    • Q9. HashMap internal working
    • Q10. Concurrent HashMap internal working
    • Q11. How to monitor health of your application?
    • Ans. 

      Monitor application health using metrics, logs, alerts, and performance monitoring tools.

      • Use monitoring tools like Prometheus, Grafana, or New Relic to track key metrics such as CPU usage, memory usage, response times, and error rates.

      • Implement logging to record important events and errors in your application. Use tools like ELK stack (Elasticsearch, Logstash, Kibana) for log analysis.

      • Set up alerts to notify you of any...

    • Answered by AI
    • Q12. How to call an API in a Microservice architecture?
    • Ans. 

      To call an API in a Microservice architecture, use HTTP requests or messaging protocols like gRPC.

      • Use HTTP requests to communicate between microservices

      • Implement RESTful APIs for easy integration

      • Leverage messaging protocols like gRPC for efficient communication

      • Consider using service discovery mechanisms for dynamic API calls

    • Answered by AI
    • Q13. Explain Profiles
    • Ans. 

      Profiles in Java are configurations that define the capabilities of a Java platform.

      • Profiles allow developers to target specific types of devices or applications.

      • They help in reducing the size of the Java runtime environment by including only the necessary APIs.

      • Examples include Java SE Embedded Profile for embedded devices and Java SE Compact Profile for resource-constrained environments.

    • Answered by AI
    • Q14. What is OpenFeign, and how is it used in microservices architecture?
    • Ans. 

      OpenFeign is a declarative web service client used to simplify the process of making HTTP requests in microservices architecture.

      • OpenFeign allows developers to define RESTful web services as interfaces and automatically generate the necessary implementation code.

      • It integrates seamlessly with Spring Cloud and other microservices frameworks to facilitate communication between services.

      • OpenFeign supports features like loa...

    • Answered by AI
    • Q15. What is the implementation process for service registry and discovery?
    • Ans. 

      Service registry and discovery involves registering services and allowing clients to discover and connect to them.

      • Implement a service registry where services can register themselves with metadata

      • Use a service discovery mechanism for clients to find and connect to services

      • Implement health checks to ensure services are available and healthy

      • Use a load balancer to distribute traffic among multiple instances of a service

    • Answered by AI
    • Q16. What are Spring boot actuators?
    • Ans. 

      Spring Boot Actuators are built-in tools that provide insight into the running application.

      • Actuators expose various endpoints to monitor and manage the application.

      • They can be used to check health, metrics, environment details, and more.

      • Examples include /actuator/health, /actuator/metrics, and /actuator/env.

    • Answered by AI
    • Q17. Synchronous vs Asynchronous communication
    • Ans. 

      Synchronous communication is blocking, while asynchronous communication is non-blocking.

      • Synchronous communication waits for a response before continuing, while asynchronous communication does not wait.

      • Examples of synchronous communication include traditional function calls, while examples of asynchronous communication include callbacks and promises.

      • Synchronous communication can lead to performance issues if there are d...

    • Answered by AI
    • Q18. Explain Synchronized keyword
    • Ans. 

      Synchronized keyword is used in Java to control access to shared resources by multiple threads.

      • Synchronized keyword can be applied to methods or code blocks to ensure only one thread can access the synchronized code at a time.

      • It prevents race conditions and ensures thread safety by creating a lock on the object or class.

      • Example: synchronized void myMethod() { // synchronized code block }

    • Answered by AI
    • Q19. What are the consequences of excessively using synchronized blocks and methods in Java?
    • Ans. 

      Excessive use of synchronized blocks and methods in Java can lead to performance issues and potential deadlocks.

      • Decreased performance due to increased contention for locks

      • Potential deadlocks if multiple threads are waiting for each other to release locks

      • Increased complexity and difficulty in debugging and maintaining code

      • Use synchronized sparingly and consider alternatives like ConcurrentHashMap or Lock interface

    • Answered by AI
    • Q20. How can you determine the number of threads needed for your application?
    • Ans. 

      The number of threads needed for an application can be determined based on factors like the type of tasks, hardware resources, and performance requirements.

      • Consider the type of tasks your application needs to perform - CPU-bound tasks may benefit from more threads, while I/O-bound tasks may not.

      • Take into account the hardware resources available - more threads may be beneficial on a multi-core processor compared to a si...

    • Answered by AI
    • Q21. Explain Executor framework
    • Ans. 

      Executor framework is a framework in Java that provides a way to manage and execute tasks asynchronously.

      • Allows for managing thread execution in a more efficient way

      • Provides a way to decouple task submission from task execution

      • Supports various types of executors like ThreadPoolExecutor and ScheduledExecutorService

      • Helps in handling tasks concurrently and asynchronously

    • Answered by AI
    • Q22. Explain BlockingQueue
    • Ans. 

      BlockingQueue is an interface in Java that represents a queue which supports operations that wait for the queue to become non-empty when retrieving an element and wait for space to become available in the queue when adding an element.

      • BlockingQueue is part of the java.util.concurrent package.

      • It is used for implementing producer-consumer scenarios where multiple threads are involved.

      • Methods like put() and take() are used...

    • Answered by AI
    Round 2 - HR 

    (2 Questions)

    • Q1. Why did you leave your previous company?
    • Ans. 

      Seeking new challenges and opportunities for growth.

      • Desire for career advancement

      • Looking for new challenges

      • Seeking better work-life balance

      • Company restructuring or downsizing

      • Relocation to a new area

    • Answered by AI
    • Q2. Other basic questions asked regarding the relevant skills and technologies I have worked with.
    Interview experience
    5
    Excellent
    Difficulty level
    Moderate
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected

    I applied via Approached by Company and was interviewed in Dec 2024. There was 1 interview round.

    Round 1 - Technical 

    (8 Questions)

    • Q1. What improvements to interfaces were introduced in Java 8 that were missing in Java 7, specifically regarding static and default methods?
    • Ans. 

      Java 8 introduced static and default methods in interfaces, allowing for method implementation and code reusability.

      • Java 8 introduced static methods in interfaces, allowing for method implementation directly in the interface itself.

      • Default methods were also introduced in Java 8, enabling interfaces to have method implementations without affecting implementing classes.

      • Static methods in interfaces can be called using the...

    • Answered by AI
    • Q2. Explain internal working of HashMap ? How to synchronize it ?
    • Ans. 

      HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.

      • HashMap uses an array of linked lists to store key-value pairs.

      • When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

      • If multiple keys hash to the same index, a linked list is used to handle collisions.

      • To synchronize a HashMap, you can use the synchronizedMap() m...

    • Answered by AI
    • Q3. Given a list of employees with their ratings, how can you sort the employees based on their ratings using the Java 8 Streaming API?
    • Q4. Will the program compile if the parent class throws a runtime exception while the child class throws an arithmetic exception?
    • Ans. 

      No, the program will not compile if the parent class throws a runtime exception while the child class throws an arithmetic exception.

      • In Java, if a parent class method throws a checked exception, the child class method can only throw the same exception or its subclasses.

      • ArithmeticException is an unchecked exception, so if the parent class throws a checked exception and the child class throws an unchecked exception, the ...

    • Answered by AI
    • Q5. In a Spring Boot application with two databases, how can you configure JDBC to specify which database to use?
    • Ans. 

      Configure JDBC in Spring Boot to specify which database to use

      • Define multiple DataSource beans in the configuration class

      • Use @Primary annotation to specify the primary DataSource

      • Use @Qualifier annotation to specify the secondary DataSource

      • Inject the DataSource beans where needed in the application

    • Answered by AI
    • Q6. How to use a jetty server in your spring boot application ?
    • Ans. 

      To use a Jetty server in a Spring Boot application, you can configure it as a dependency and customize its settings.

      • Add Jetty server dependency in your pom.xml file

      • Exclude Tomcat server dependency if it's included by default in Spring Boot

      • Configure Jetty server settings in application.properties or application.yml file

      • Example: Add Jetty dependency - <dependency> <groupId>org.springframework.boot</groupId...

    • Answered by AI
    • Q7. Difference between @RequestParam and @PathVariable ?
    • Ans. 

      RequestParam is used to extract query parameters from the URL, while PathVariable is used to extract values from the URI path.

      • RequestParam is used for query parameters in the URL, while PathVariable is used for values in the URI path.

      • RequestParam is optional, while PathVariable is required.

      • RequestParam is used with the @RequestParam annotation, while PathVariable is used with the @PathVariable annotation.

      • Example: @Requ...

    • Answered by AI
    • Q8. How would you handle a scenario where one microservice is awaiting a response from another microservice that is taking an extended time to respond?
    • Ans. 

      I would implement timeout mechanisms and retries to handle the scenario of one microservice awaiting a response from another microservice taking an extended time.

      • Implement timeout mechanisms in the calling microservice to limit the waiting time for a response.

      • Set up retry logic to automatically resend the request to the slow microservice if no response is received within the specified timeout period.

      • Use circuit breaker...

    • Answered by AI

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Prepare the basics about Java 8 , Core Java , Springboot , Microservices and MySql.
    Interview experience
    5
    Excellent
    Difficulty level
    Moderate
    Process Duration
    Less than 2 weeks
    Result
    Not Selected

    I applied via Company Website and was interviewed in Nov 2024. There were 2 interview rounds.

    Round 1 - Technical 

    (7 Questions)

    • Q1. Create one Spring boot controller from end to end. No need to create a spring boot project we just want to see the structure and end to end implementation.
    • Q2. Write a java 8 program to get the characters from a string whose count is 2 or more than 2 e.g. input: baseball , output: b, a, l.
    • Q3. Why you left your previous organization.
    • Q4. What is the functional interface
    • Q5. What are the OOPS concepts. and some questions related to inheritance.
    • Q6. Asked about the project mentioned in CV (Client project) and asked its architecture.
    • Q7. Various SQL join types
    Round 2 - HR 

    (3 Questions)

    • Q1. Are you ready to relocate to job location
    • Q2. Why are you leaving your previous organization.
    • Q3. Expectation about salary

    Interview Preparation Tips

    Interview preparation tips for other job seekers - Do your basics strong, and keep hands on problems.
    Interview experience
    5
    Excellent
    Difficulty level
    Moderate
    Process Duration
    Less than 2 weeks
    Result
    Selected Selected

    I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.

    Round 1 - Technical 

    (6 Questions)

    • Q1. Java 8 , java 11 and java 17 features?
    • Ans. 

      Java 8 introduced lambda expressions, Java 11 added local-variable syntax for lambda parameters, and Java 17 included sealed classes and pattern matching.

      • Java 8 introduced lambda expressions for functional programming.

      • Java 11 added local-variable syntax for lambda parameters to simplify code.

      • Java 17 included sealed classes to restrict inheritance and pattern matching for instanceof checks and type casts.

    • Answered by AI
    • Q2. Dispatcher servlet, design patterns
    • Q3. @SpringbootApplication annotation, actuators
    • Q4. String Coding question with java 8 features such as lambda function and stream api
    • Q5. Number of words in a string
    • Ans. 

      Count the number of words in a given string.

      • Split the string by spaces and count the number of resulting elements.

      • Handle edge cases like multiple spaces or empty strings.

      • Consider punctuation marks as part of words unless specified otherwise.

    • Answered by AI
    • Q6. Microservice design patterns

    HCL Group Interview FAQs

    How many rounds are there in HCL Group Java Developer interview?
    HCL Group interview process usually has 1-2 rounds. The most common rounds in the HCL Group interview process are Technical, HR and Assignment.
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    Some of the top questions asked at the HCL Group Java Developer interview -

    1. How interface is implemented in j...read more
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    HCL Group Java Developer Interview Process

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    Interview experience

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