Top 50 Spring Boot Interview Questions and Answers

Annotation used in Spring Boot to enable the application to be run from a main method.

• Used to mark a class as the main entry point for a Spring Boot application

• Eliminates the need for a traditional main method

• Can be used in combination with @SpringBo...read more

Use Spring Boot configuration to connect master and slave instances of a DB

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

• Use @Primary annotation for the master data source and @Qualifier annotation for the slave dat...read more

To print something on browser using Spring Boot, you can create a controller method that returns a view or a response entity.

• Create a controller class with a method that returns a view or a response entity

• Use Thymeleaf or other template engine to ren...read more

Create a Spring Boot application to generate an XML file from two input values.

• Create a Spring Boot project using Spring Initializr

• Create a REST controller to accept two input values

• Use JAXB to generate XML from the input values

• Return the generated X...read more

Spring Boot is a framework that uses various components to simplify the development of Java applications.

• Spring Core: Provides dependency injection and inversion of control.

• Spring MVC: Enables building web applications.

• Spring Data: Simplifies databas...read more

Multithreading in Spring Boot allows for concurrent execution of tasks, improving performance and responsiveness.

• Spring Boot provides support for multithreading through the use of @Async annotation.

• By annotating a method with @Async, it will be execu...read more

Transactions in Spring Boot help manage database operations as a single unit of work.

• Transactions ensure that all database operations either succeed or fail together.

• Use @Transactional annotation to mark a method as transactional.

• Transactions can be ...read more

Low level design involves creating detailed technical specifications for building a Spring Boot app.

• Identify the components and their interactions in the app

• Define the data model and database schema

• Design the RESTful APIs and their endpoints

• Implement...read more

Tomcat and Spring Boot versions are independent of each other, but they can be compatible with each other.

• Tomcat versions can range from 7.x to 10.x, with the latest stable version being 10.0.12.

• Spring Boot versions are typically aligned with Spring ...read more

Springboot is a framework that simplifies the development of Java applications, while Spring is a more comprehensive framework for building enterprise applications.

• Springboot is opinionated and provides defaults for configuration, making it easier to...read more

Some important Spring Boot annotations include @SpringBootApplication, @RestController, @Autowired, @RequestMapping, @ComponentScan.

• @SpringBootApplication - Used to mark the main class of a Spring Boot application.

• @RestController - Used to define RES...read more

The @Transactional annotation in Spring JPA is used to manage transactions in database operations.

• Ensures that a method is executed within a transaction context

• Rolls back the transaction if an exception is thrown

• Controls the transaction boundaries

Spring Boot is a Java-based framework used for creating standalone, production-grade Spring-based Applications.

• Spring Boot simplifies the process of creating Spring applications by providing a set of default configurations.

• It allows developers to qui...read more

To connect a database to a Spring Boot application, you need to configure the database properties and dependencies in the application's configuration files.

• Add the necessary database dependencies in the project's build file (e.g., pom.xml for Maven)....read more

Spring Boot dependency injection is a design pattern where objects are passed their dependencies rather than creating them internally.

• In Spring Boot, dependency injection is achieved through the use of @Autowired annotation.

• It helps in achieving loos...read more

Learn to create a REST service using Spring Boot with essential components and examples.

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

• Add dependencies: 'spring-boot-starter-web' for RESTful services.

• Create a model class, e.g., 'Use...read more

Spring Boot allows multiple database connections through configuration and using multiple data sources.

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

• Create separate DataSource and JdbcTemplate beans for each data source

• Use @Qu...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

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

Microservices in Spring Boot allow for building modular, scalable applications.

• Spring Boot provides a lightweight framework for building microservices

• Each microservice can be developed and deployed independently

• Communication between microservices can...read more

Spring MVC is a web framework while Spring Boot is an opinionated way of building Spring applications.

• Spring MVC requires more configuration and setup compared to Spring Boot

• Spring Boot provides a pre-configured environment for building Spring applic...read more

Spring Boot simplifies Spring application development with auto-configuration, embedded servers, and production-ready features.

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

A spring starter is a mechanical device used to start an engine by storing energy in a spring and releasing it to turn the engine's crankshaft.

• Spring starters are commonly used in small engines, such as those found in lawnmowers or chainsaws.

• The spri...read more

Spring Boot is a framework for building Java-based applications quickly and efficiently with minimal configuration.

• Simplifies the setup of new Spring applications with default configurations.

• Supports microservices architecture, allowing easy developm...read more

Use Spring Boot's multiple datasource configuration to work with 2 different databases

• Define multiple datasource configurations in application.properties or application.yml

• Create separate DataSource and JdbcTemplate beans for each database

• Use @Primar...read more

Spring Boot simplifies the development of Java applications by providing a set of tools and conventions for building production-ready applications quickly.

• Provides a pre-configured environment for developing and deploying Java applications

• Reduces the...read more

Database connection in Spring Boot is configured using application.properties or application.yml file.

• Define database connection properties in application.properties or application.yml file

• Use @EnableJpaRepositories annotation to enable JPA repositor...read more