Spring Boot interview Questions with Answers [Top10 ]

spring boot interview questions with answers:

Table of Contents

Sure, here are some commonly asked Spring Boot interview questions and their answers:

Spring Boot interview Questions with Answers

1. What is Spring Boot?

Ans. Spring Boot is an open-source Java-based framework used to create standalone, production-grade Spring-based applications quickly and easily. It provides a preconfigured set of libraries and tools that help developers to build robust and scalable web applications.

2. What are the advantages of using Spring Boot?

Ans. The advantages of using Spring Boot are:

It simplifies the configuration and deployment process of Spring applications.
It reduces the amount of boilerplate code required to build Spring-based applications.
It provides embedded servers, which makes it easy to run web applications as standalone applications.
It provides automatic configuration and starter dependencies, which help developers to get started quickly.
It supports multiple data sources, including JDBC, NoSQL, and in-memory databases.
It provides built-in support for testing, monitoring, and metrics.

3. How does Spring Boot differ from Spring Framework?

Ans. Spring Boot is built on top of the Spring Framework, and it aims to simplify the configuration and deployment process of Spring applications. Spring Framework provides a wide range of modules for building enterprise applications, whereas Spring Boot provides a preconfigured set of libraries and tools that help developers to build standalone, production-grade Spring-based applications quickly and easily.

4. What is a starter in Spring Boot?

Ans. A starter is a dependency that provides a set of preconfigured libraries and tools for a specific functionality or technology. For example, the Spring Boot Starter Web dependency provides a preconfigured set of libraries and tools for building web applications. Spring Boot starters make it easy to add dependencies and get started with new technologies quickly.

5. How does Spring Boot auto-configuration work?

Ans. Spring Boot auto-configuration works by analyzing the classpath of the application and automatically configuring the Spring application context based on the libraries and tools that are present on the classpath. Spring Boot uses a set of conventions and rules to determine the configuration that needs to be applied. If necessary, developers can override the auto-configuration and provide their own configuration.

More Article –

6. What is Spring Boot Actuator?

Ans. Spring Boot Actuator is a set of tools and libraries that provide production-ready features for monitoring and managing Spring Boot applications. It provides endpoints for gathering application metrics, health checks, and other operational data. Actuator can be used to monitor and manage Spring Boot applications in production environments.

7. What is the difference between @RestController and @Controller in Spring Boot?

Ans. The @Controller annotation is used to mark a class as a Spring MVC controller, which is responsible for handling HTTP requests and returning responses. The @RestController annotation is a specialization of the @Controller annotation, which is used to mark a class as a controller that returns a response in the format of JSON or XML. In other words, @RestController combines the functionality of @Controller and @ResponseBody annotations.

8. How can you configure a custom error page in Spring Boot?

Ans. You can configure a custom error page in Spring Boot by creating an HTML file and placing it in the resources/templates/error directory. You can then configure the error page using the @ControllerAdvice annotation.

9. What is the difference between @Component, @Service, and @Repository annotations in Spring Boot?

Ans. @Component is a generic annotation that marks a Java class as a Spring component. @Service is used to mark a Java class as a service. @Repository is used to mark a Java class as a repository.

10. How does Spring Boot simplify the configuration of database connections?

Spring Boot provides several auto-configuration classes for popular database connection pools such as HikariCP, Apache DBCP, and Tomcat JDBC. These classes configure the connection pool automatically based on the available dependencies in the classpath.

I hope these answers help you prepare for your Spring Boot interview!