Top 50 Spring Boot Interview Questions and Answers

SpringBootApplication is a combination of three annotations in Spring Boot.

• SpringBootApplication is a meta-annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations.

• @Configuration annotation indicates that the ...read more

Spring Batch is a lightweight, comprehensive framework for batch processing in Java.

• Spring Batch provides reusable functions for processing large volumes of data.

• It supports reading, processing, and writing data in chunks.

• It includes features like tr...read more

Creating a Spring Boot application for web and database operations

• Create a new Spring Boot project using Spring Initializr

• Add necessary dependencies for web and database operations in pom.xml

• Create a database schema and configure database connection ...read more

@SpringBootApplication is a Spring Boot annotation that enables auto-configuration and component scanning.

• Enables auto-configuration of the Spring application context

• Enables component scanning for beans

• Provides a convenient shortcut for @Configuratio...read more

Spring is a Java framework for building enterprise applications. Spring Boot is a tool that simplifies the setup and development of Spring applications.

• Spring is a powerful Java framework used for building enterprise applications.

• It provides comprehe...read more

To connect 2 different databases from a Spring Boot application, you can use Spring Data JPA and configure multiple data sources.

• Configure the data sources in the application.properties file

• Create separate JPA repositories for each data source

• Use @Qu...read more

Dependency Injection is a design pattern in Spring Boot where the dependencies of a class are injected from the outside.

• In Spring Boot, Dependency Injection is achieved through inversion of control, where the control of creating and managing objects ...read more

Creating a Spring Boot controller involves defining endpoints, handling requests, and returning responses.

• 1. Set up a Spring Boot project using Spring Initializr or your IDE.

• 2. Add necessary dependencies in 'pom.xml' or 'build.gradle'. Example: 'spri...read more

Performance issues in Spring Boot can be handled by optimizing code, using caching, monitoring application metrics, and tuning database queries.

• Optimize code by reducing unnecessary loops, improving algorithms, and minimizing database calls.

• Use cachi...read more

Creating API's using Spring Boot framework for Java development

• Use @RestController annotation to define RESTful web services

• Define request mappings using @RequestMapping annotation

• Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations...read more

Spring is a framework for building Java applications, while Spring Boot is an extension that simplifies the setup and development process.

• Spring is a comprehensive framework that provides infrastructure support for developing Java applications.

• Spring...read more

Spring Boot simplifies Java development with rapid setup, embedded servers, and production-ready features.

• Rapid Development: Spring Boot reduces boilerplate code, allowing developers to focus on business logic. For example, using @SpringBootApplicati...read more

Spring Boot simplifies Spring application development with auto-configuration and embedded servers, enhancing productivity.

• Auto-Configuration: Spring Boot automatically configures your application based on the dependencies present in the classpath.

• Em...read more

Implement CRUD operations for user table in a Spring Boot project.

• Create a Spring Boot project using Spring Initializr

• Define a User entity with necessary fields and annotations

• Create a UserRepository interface extending JpaRepository

• Implement methods...read more

A Spring Boot REST controller is used to handle incoming HTTP requests and return appropriate responses.

• Create a new Java class annotated with @RestController

• Define request mapping annotations like @GetMapping, @PostMapping, @PutMapping, @DeleteMappi...read more

Spring Boot microservices are small, independent, loosely coupled services built using the Spring Boot framework.

• Microservices are small, independent services that work together to form a larger application.

• Spring Boot is a framework that simplifies ...read more

Implementing CRUD operations in Spring Boot with MySQL involves creating, reading, updating, and deleting data using REST APIs.

• 1. Set up Spring Boot project with dependencies: Spring Web, Spring Data JPA, MySQL Driver.

• 2. Configure application.propert...read more

Spring Boot validation is a feature that allows developers to validate input data in a Spring Boot application.

• Spring Boot validation is used to ensure that the data entered by the user meets certain criteria.

• It can be applied to request parameters, ...read more

Develop a Spring Boot API for a given table

• Create a Spring Boot project with necessary dependencies

• Define entity class representing the table

• Create a repository interface extending JpaRepository

• Implement service layer with business logic

• Create REST c...read more

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.

• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows for easy creatio...read more

Authentication in Spring Boot is handled using Spring Security which provides various authentication mechanisms.

• Use Spring Security to configure authentication in Spring Boot

• Define a custom UserDetailsService to load user-specific data for authentica...read more

Use Spring Data JPA to connect Spring Boot project with database.

• Add database configuration in application.properties or application.yml file

• Create entity classes annotated with @Entity and @Table

• Create repository interfaces extending JpaRepository

• Us...read more

Spring Boot is preferred for rapid development and microservices, while Spring MVC is used for traditional web applications.

• Spring Boot is preferred for rapid development of microservices due to its convention over configuration approach.

• Spring MVC i...read more

Spring Boot applications can be deployed using various methods such as embedded servers, Docker containers, and cloud platforms.

• Deploying as a standalone JAR file using embedded servers like Tomcat or Jetty

• Building a Docker image and running the appl...read more

Yes, I have done customisation in spring-boot.

• Implemented custom error handling by extending ResponseEntityExceptionHandler

• Created custom annotations for validation

• Configured custom logging using Logback

Integrating Spring Data JPA with Spring Boot allows for easy database operations in a Spring Boot application.

• Add Spring Data JPA dependency in pom.xml

• Create JPA entity classes annotated with @Entity

• Create a repository interface extending JpaReposito...read more

Creating API using Spring Boot for software development.

• Use @RestController annotation to define RESTful web services.

• Define request mappings using @RequestMapping annotation.

• Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations for ...read more