Capgemini Java Developer Interview Questions, Process, and Tips

Our project architecture follows a microservices design pattern with a front-end client communicating with multiple back-end services.

• Front-end client built using Angular framework

• Back-end services developed in Java using Spring Boot

• Communication between services through RESTful APIs

• Database layer implemented using MySQL

• Containerized deployment using Docker and managed with Kubernetes

Spring Security is a powerful and customizable authentication and access control framework for Java applications.

• Provides authentication and authorization capabilities for Java applications

• Integrates with Spring Framework for easy configuration and usage

• Supports various authentication mechanisms like form-based, basic, OAuth, etc.

• Allows for fine-grained access control through roles and permissions

• Can be easily extended...read more

Global exception handling in Spring Boot can be achieved using @ControllerAdvice and @ExceptionHandler annotations.

• Create a class annotated with @ControllerAdvice to handle global exceptions

• Define methods in this class annotated with @ExceptionHandler for specific exception types

• Return a ResponseEntity with appropriate status code and error message in the @ExceptionHandler methods

Circuit breaker pattern is a design pattern used in software development to prevent system failures and improve resilience.

• Circuit breaker pattern is used to handle faults in distributed systems.

• It monitors for failures and trips when a threshold is reached, preventing further requests.

• Once the circuit breaker trips, it can be configured to allow some requests through to check if the system has recovered.

• If the system ...read more

Static binding is resolved at compile time, while dynamic binding is resolved at runtime.

• Static binding is also known as early binding, where the method call is resolved at compile time based on the type of reference variable.

• Dynamic binding is also known as late binding, where the method call is resolved at runtime based on the actual object type.

• Example of static binding: method overloading.

• Example of dynamic binding

Functional interface is an interface with only one abstract method, used for lambda expressions.

• Functional interface can have multiple default or static methods.

• It can also have methods from Object class, like equals(), hashCode(), etc.

• Example: java.util.function.Function is a functional interface with apply() method.

Types of indexes in SQL include clustered, non-clustered, unique, and composite indexes.

• Clustered index physically reorders the table based on the index key

• Non-clustered index creates a separate structure for the index

• Unique index ensures that no two rows have the same key values

• Composite index uses multiple columns as the index key

Merge two arrays of strings into a single array

• Create a new array with the combined length of the two input arrays

• Copy elements from the first array to the new array

• Copy elements from the second array to the new array starting from the end of the first array

Remove vowels from a given string to get the original name back.

• Create a function to iterate through each character of the string

• Check if the character is a vowel (a, e, i, o, u) and remove it

• Return the modified string

Use SQL query with MOD function to get even row data

• Use MOD function to filter out even rows

• Example: SELECT * FROM table_name WHERE MOD(row_number, 2) = 0;

Constants in SQL are values that remain the same throughout the execution of a query or program.

• Constants can be defined using the 'CONST' keyword in SQL.

• They are used to store values that do not change during the execution of a query.

• Constants can be used in WHERE clauses, JOIN conditions, and other parts of a SQL query.

• Example: CONST MAX_VALUE = 100;

Filter employees with salary > 25,000 and department IT using Java 8.

• Use Java 8 stream API to filter employees based on salary and department.

• Use lambda expressions to define the filtering criteria.

• Example: employees.stream().filter(e -> e.getSalary() > 25000 && e.getDepartment().equals("IT")).collect(Collectors.toList());

The interview questions cover a wide range of topics including design patterns, exception handling, Hibernate, MongoDB, Java collections, Spring framework, and microservices.

• Design patterns like markers interface, functional interface, and Singleton pattern are important in Java development.

• Understanding exception handling with try-catch-finally blocks is crucial for handling errors in Java applications.

• Knowing the dif...read more