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Capgemini Senior Java Developer Interview Questions and Answers

Updated 7 Jun 2025

29 Interview questions

A Senior Java Developer was asked 2w ago
Q. Find the first non-repeating character using Java 8.
Ans. 

Use Java 8 Streams to find the first non-repeating character in a string efficiently.

  • Utilize a Map to count character occurrences: `Map<Character, Long> charCount = str.chars().mapToObj(c -> (char) c).collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));`

  • Filter the characters based on their count: `charCount.entrySet().stream().filter(entry -> entry.getValue() == 1)`.

  • Find the firs...

🔥 Asked by recruiter 3 times
A Senior Java Developer was asked 2w ago
Q. What is the difference between map and flatMap?
Ans. 

Map transforms elements, while flatMap flattens nested structures and then transforms them.

  • map() applies a function to each element, returning a new stream of transformed elements.

  • Example: [1, 2, 3].map(x -> x * 2) results in [2, 4, 6].

  • flatMap() applies a function that returns a stream for each element, then flattens the result.

  • Example: [1, 2].flatMap(x -> Stream.of(x, x * 2)) results in [1, 2, 2, 4].

  • Use map...

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A Senior Java Developer was asked 4mo ago
Q. How do you find the average salary of employees in each department using Java 8 Streams?
Ans. 

Calculate average salary of employees in each department using Java 8 Stream.

  • Use Java 8 Stream to group employees by department

  • Calculate average salary for each department using Stream's 'collect' method

  • Use 'Collectors.averagingDouble' to calculate average salary

A Senior Java Developer was asked 4mo ago
Q. What is Eureka Server?
Ans. 

Eureka Server is a service registry for microservices in a cloud environment.

  • Eureka Server is part of Netflix OSS and allows microservices to register themselves and discover other services.

  • It helps in load balancing and failover of services by keeping track of available instances.

  • Eureka Server uses a REST API for communication between services and the server.

  • Example: Microservices A, B, and C register themselves ...

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A Senior Java Developer was asked 4mo ago
Q. How do you handle exceptions in Spring Boot?
Ans. 

Exception handling in SpringBoot involves using @ExceptionHandler, @ControllerAdvice, and global exception handling.

  • Use @ExceptionHandler annotation in controller classes to handle specific exceptions.

  • Use @ControllerAdvice annotation to define global exception handling for all controllers.

  • Implement a custom exception handler class to handle exceptions globally.

  • Use ResponseEntity to return custom error messages and...

A Senior Java Developer was asked 4mo ago
Q. What is a circuit breaker?
Ans. 

Circuit Breaker is a design pattern used in software development to prevent cascading failures in distributed systems.

  • Circuit Breaker monitors the health of a service and stops sending requests if the service is not responding properly.

  • It helps in improving the resilience of the system by providing a fallback mechanism when a service is down.

  • Circuit Breaker can be configured with thresholds for error rates or resp...

🔥 Asked by recruiter 4 times
A Senior Java Developer was asked 4mo ago
Q. What is a Singleton class?
Ans. 

A Singleton Class ensures a class has only one instance and provides a global point of access to it.

  • Singleton pattern restricts instantiation of a class to one object.

  • It is commonly used for logging, driver objects, caching, and thread pools.

  • Example in Java: Use a private constructor and a static method to get the instance.

  • Thread-safe implementation can be achieved using synchronized methods or double-checked lock...

Are these interview questions helpful?
🔥 Asked by recruiter 4 times
A Senior Java Developer was asked 4mo ago
Q. What is a Functional Interface?
Ans. 

A functional interface in Java is an interface with a single abstract method, enabling lambda expressions and method references.

  • A functional interface can have multiple default or static methods.

  • Common examples include Runnable, Callable, and Comparator.

  • It is annotated with @FunctionalInterface for clarity.

  • Lambda expressions can be used to instantiate functional interfaces.

A Senior Java Developer was asked 6mo ago
Q. Write a program using Java 8 features.
Ans. 

Program using Java 8 features to filter a list of strings starting with 'A' and convert them to uppercase.

  • Use Java 8 stream API to filter the strings starting with 'A'.

  • Use map() function to convert the filtered strings to uppercase.

  • Collect the results into a new list using collect() function.

A Senior Java Developer was asked 6mo ago
Q. What are the advantages of Spring Boot over Spring?
Ans. 

Spring Boot simplifies the development of Spring applications by providing out-of-the-box configurations and reducing boilerplate code.

  • Spring Boot provides a quick and easy way to set up a Spring application with minimal configuration.

  • It includes embedded servers like Tomcat, Jetty, or Undertow, eliminating the need for deploying WAR files.

  • Auto-configuration feature in Spring Boot automatically configures the appl...

Capgemini Senior Java Developer Interview Experiences

29 interviews found

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
-
Result
-

I appeared for an interview in Jan 2025.

Round 1 - Technical 

(8 Questions)

  • Q1. Difference between HashMap and TreeMap? Internal working of HashMap?
  • Ans. 

    HashMap is unordered, uses hashing for key-value pairs. TreeMap is ordered, uses Red-Black tree for key-value pairs.

    • HashMap uses hashing to store key-value pairs, allowing for O(1) retrieval time on average.

    • TreeMap uses Red-Black tree to store key-value pairs, maintaining order based on keys.

    • HashMap allows one null key and multiple null values, while TreeMap does not allow null keys.

    • Example: HashMap<String, Integer&...

  • Answered by AI
  • Q2. Functional Interface?
  • Ans. 

    A functional interface in Java is an interface with a single abstract method, enabling lambda expressions and method references.

    • A functional interface can have multiple default or static methods.

    • Common examples include Runnable, Callable, and Comparator.

    • It is annotated with @FunctionalInterface for clarity.

    • Lambda expressions can be used to instantiate functional interfaces.

  • Answered by AI
  • Q3. Singleton Class?
  • Ans. 

    A Singleton Class ensures a class has only one instance and provides a global point of access to it.

    • Singleton pattern restricts instantiation of a class to one object.

    • It is commonly used for logging, driver objects, caching, and thread pools.

    • Example in Java: Use a private constructor and a static method to get the instance.

    • Thread-safe implementation can be achieved using synchronized methods or double-checked locking.

  • Answered by AI
  • Q4. What is Eureka Server?
  • Ans. 

    Eureka Server is a service registry for microservices in a cloud environment.

    • Eureka Server is part of Netflix OSS and allows microservices to register themselves and discover other services.

    • It helps in load balancing and failover of services by keeping track of available instances.

    • Eureka Server uses a REST API for communication between services and the server.

    • Example: Microservices A, B, and C register themselves with ...

  • Answered by AI
  • Q5. How to handle Exception in SpringBoot?
  • Ans. 

    Exception handling in SpringBoot involves using @ExceptionHandler, @ControllerAdvice, and global exception handling.

    • Use @ExceptionHandler annotation in controller classes to handle specific exceptions.

    • Use @ControllerAdvice annotation to define global exception handling for all controllers.

    • Implement a custom exception handler class to handle exceptions globally.

    • Use ResponseEntity to return custom error messages and stat...

  • Answered by AI
  • Q6. Find the average sal of employee in each department using java 8 Stream?
  • Ans. 

    Calculate average salary of employees in each department using Java 8 Stream.

    • Use Java 8 Stream to group employees by department

    • Calculate average salary for each department using Stream's 'collect' method

    • Use 'Collectors.averagingDouble' to calculate average salary

  • Answered by AI
  • Q7. What is circuit Breaker?
  • Ans. 

    Circuit Breaker is a design pattern used in software development to prevent cascading failures in distributed systems.

    • Circuit Breaker monitors the health of a service and stops sending requests if the service is not responding properly.

    • It helps in improving the resilience of the system by providing a fallback mechanism when a service is down.

    • Circuit Breaker can be configured with thresholds for error rates or response ...

  • Answered by AI
  • Q8. What is docker and kubernates?
  • Ans. 

    Docker is a platform for developing, shipping, and running applications in containers. Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

    • Docker allows developers to package applications and dependencies into containers for easy deployment and scalability.

    • Kubernetes helps in automating the deployment, scaling, and management of containerized applications...

  • Answered by AI
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
-
Result
-
Round 1 - One-on-one 

(2 Questions)

  • Q1. Discussion regarding normal process followed. Basic java questions about java 8. Technology and framework used. Interview was for Telecom domain.
  • Q2. Sorting, filtering, Exception handling questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Good decision just they wanted to know what you know then asked questions
Interview experience
1
Bad
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

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

Round 1 - Technical 

(8 Questions)

  • Q1. Write a program on java8 ?
  • Ans. 

    Program using Java 8 features to filter a list of strings starting with 'A' and convert them to uppercase.

    • Use Java 8 stream API to filter the strings starting with 'A'.

    • Use map() function to convert the filtered strings to uppercase.

    • Collect the results into a new list using collect() function.

  • Answered by AI
  • Q2. How connect two dbs in spring boot?
  • Ans. 

    To connect two databases in Spring Boot, you can configure multiple data sources and use JPA to interact with them.

    • Configure multiple data sources in application.properties or application.yml file

    • Define multiple DataSource beans in your configuration class

    • Use @Primary annotation to specify the primary data source

    • Use @Qualifier annotation to specify which data source to use in a specific repository or service

    • Use @Transa...

  • Answered by AI
  • Q3. Index in MySQL?
  • Ans. 

    An index in MySQL is a data structure that improves the speed of data retrieval operations on a database table.

    • Indexes are used to quickly locate rows in a table without having to search every row.

    • They can be created on one or more columns in a table.

    • Indexes can be unique, which means that the indexed columns must contain unique values.

    • Examples of indexes include primary keys, unique keys, and regular indexes.

  • Answered by AI
  • Q4. Difference between post & get mapping in spring boot and can we update the data using post mapping?
  • Ans. 

    Post mapping is used to create or update data, while get mapping is used to retrieve data. Yes, data can be updated using post mapping.

    • Post mapping is used to create or update data in the server, while get mapping is used to retrieve data from the server.

    • Post mapping is typically used for operations that modify data, such as creating a new resource or updating an existing one.

    • Get mapping is used for operations that do ...

  • Answered by AI
  • Q5. Microservices design patterns?
  • Ans. 

    Design patterns in microservices architecture help in solving common problems and improving scalability, maintainability, and flexibility.

    • Service Registry pattern - used for service discovery and registration, such as Netflix Eureka

    • Circuit Breaker pattern - prevents cascading failures by failing fast and providing fallback mechanisms, like Hystrix

    • API Gateway pattern - acts as a single entry point for clients to access ...

  • Answered by AI
  • Q6. Explain about SOLID principles in java?
  • Ans. 

    SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.

    • S - Single Responsibility Principle: A class should have only one reason to change.

    • O - Open/Closed Principle: Classes should be open for extension but closed for modification.

    • L - Liskov Substitution Principle: Objects of a superclass should be replaceable with obje...

  • Answered by AI
  • Q7. What are the advantages of spring boot over spring?
  • Ans. 

    Spring Boot simplifies the development of Spring applications by providing out-of-the-box configurations and reducing boilerplate code.

    • Spring Boot provides a quick and easy way to set up a Spring application with minimal configuration.

    • It includes embedded servers like Tomcat, Jetty, or Undertow, eliminating the need for deploying WAR files.

    • Auto-configuration feature in Spring Boot automatically configures the applicati...

  • Answered by AI
  • Q8. Give one API task and need to sort the employee or users data based on the interviewer requirement?
  • Ans. 

    Implement a REST API to sort employee data based on various criteria like name, age, or salary.

    • Use Spring Boot to create a RESTful API.

    • Define an Employee class with fields like id, name, age, and salary.

    • Implement a GET endpoint '/employees' that accepts query parameters for sorting.

    • Use Java's Comparator to sort the list based on the specified field.

    • Example: /employees?sort=name or /employees?sort=age

  • Answered by AI

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
No response

I appeared for an interview in May 2025, where I was asked the following questions.

  • Q1. Difference between map and flatmap
  • Ans. 

    Map transforms elements, while flatMap flattens nested structures and then transforms them.

    • map() applies a function to each element, returning a new stream of transformed elements.

    • Example: [1, 2, 3].map(x -> x * 2) results in [2, 4, 6].

    • flatMap() applies a function that returns a stream for each element, then flattens the result.

    • Example: [1, 2].flatMap(x -> Stream.of(x, x * 2)) results in [1, 2, 2, 4].

    • Use map when...

  • Answered by AI
  • Q2. Find the first non-repeating character using Java 8
  • Ans. 

    Use Java 8 Streams to find the first non-repeating character in a string efficiently.

    • Utilize a Map to count character occurrences: `Map<Character, Long> charCount = str.chars().mapToObj(c -> (char) c).collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));`

    • Filter the characters based on their count: `charCount.entrySet().stream().filter(entry -> entry.getValue() == 1)`.

    • Find the first non...

  • Answered by AI
  • Q3. What is autowiring
  • Ans. 

    Autowiring is a Spring framework feature that automatically injects dependencies into beans without explicit configuration.

    • Autowiring can be done using annotations like @Autowired, @Inject, or @Resource.

    • It simplifies dependency management by reducing boilerplate code.

    • Example: Using @Autowired on a constructor allows Spring to automatically provide the required dependencies.

    • There are different modes of autowiring: byTyp...

  • Answered by AI
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Asked questions based on Core Java,Spring Boot,Microservices
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Questions about current project
  • Q2. Various follow ups on monolithic vs microservices architecture
  • Ans. 

    Microservices architecture allows for modular, scalable, and flexible development compared to monolithic architecture.

    • Microservices break down applications into smaller, independent services that communicate through APIs.

    • Each microservice can be developed, deployed, and scaled independently, leading to faster development cycles and easier maintenance.

    • Monolithic architecture involves building an entire application as a ...

  • Answered by AI
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Basic cire java spring boot question
  • Ans. 

    Spring Boot simplifies Java application development with built-in features and configurations for rapid deployment.

    • Spring Boot uses 'convention over configuration' to reduce boilerplate code.

    • It provides embedded servers like Tomcat and Jetty for easy deployment.

    • Spring Boot applications can be easily configured using application.properties or application.yml files.

    • It supports dependency injection through Spring's IoC co...

  • Answered by AI
  • Q2. Basic sql queries
Round 2 - Technical 

(1 Question)

  • Q1. Solid design principles and Microservice
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - One-on-one 

(2 Questions)

  • Q1. What is IOC in spring
  • Ans. 

    IOC stands for Inversion of Control in Spring, a design principle where the control of object creation and lifecycle is shifted to a container.

    • IOC is a design principle in which the flow of control is inverted compared to traditional programming.

    • In Spring, IOC is achieved through dependency injection, where objects are provided their dependencies rather than creating them themselves.

    • IOC helps in decoupling components, ...

  • Answered by AI
  • Q2. What is Hashmap in java collections
  • Ans. 

    HashMap is a data structure in Java collections that stores key-value pairs.

    • HashMap implements the Map interface and uses hashing to store elements.

    • It allows null values and one null key.

    • Example: HashMap<String, Integer> map = new HashMap<>();

  • Answered by AI

Skills evaluated in this interview

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

(2 Questions)

  • Q1. Program writing
  • Q2. Hashset and code based on it
Interview experience
4
Good
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Referral and was interviewed in Oct 2023. There were 2 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. HashMap HashSet
  • Q2. Multithreading questions, Spring boot and microservices
Round 2 - Technical 

(1 Question)

  • Q1. COLLECTIONS AND JAVA 8 QUESTIONS

Interview Preparation Tips

Interview preparation tips for other job seekers - Keep your basics

Capgemini Interview FAQs

How many rounds are there in Capgemini Senior Java Developer interview?
Capgemini interview process usually has 1-2 rounds. The most common rounds in the Capgemini interview process are Technical, Resume Shortlist and One-on-one Round.
How to prepare for Capgemini Senior Java Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Capgemini. The most common topics and skills that interviewers at Capgemini expect are Java, Microservices, Spring Boot, Web Services and Hibernate.
What are the top questions asked in Capgemini Senior Java Developer interview?

Some of the top questions asked at the Capgemini Senior Java Developer interview -

  1. 1.difference between list,set and map in java collections 2.exception Handling ...read more
  2. what is marker interface what is Stream api difference between Runnable and cal...read more
  3. What are the advantages of spring boot over spri...read more
How long is the Capgemini Senior Java Developer interview process?

The duration of Capgemini Senior Java Developer interview process can vary, but typically it takes about less than 2 weeks to complete.

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Overall Interview Experience Rating

3.7/5

based on 24 interview experiences

Difficulty level

Easy 20%
Moderate 73%
Hard 7%

Duration

Less than 2 weeks 70%
2-4 weeks 20%
4-6 weeks 10%
View more
Capgemini Senior Java Developer Salary
based on 166 salaries
₹13 L/yr - ₹24.9 L/yr
9% more than the average Senior Java Developer Salary in India
View more details

Capgemini Senior Java Developer Reviews and Ratings

based on 10 reviews

3.9/5

Rating in categories

4.3

Skill development

4.0

Work-life balance

2.9

Salary

4.2

Job security

4.5

Company culture

3.1

Promotions

4.4

Work satisfaction

Explore 10 Reviews and Ratings
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