15 Spring Boot Interview Questions and Answers (2024 Update)

By Sushmith T

Published on Wed, 23 November 2022 15:40

Introduction

What is Spring Framework?

The Spring Framework is an open-source application framework with many features that can be used by any Java application. On the Java platform, spring framework extensions are used for building and developing web applications.

Suggested reading: JavaScript Interview Questions

What is Spring Boot?

Spring Boot is another open-source Java-based framework used by developers for building applications. Spring Boot helps developers iterate on programs faster than with other sources.

Spring Boot is one of the best backend developer frameworks used for building and developing web applications, allowing developers to design production-grade web applications.

When it comes to interviews about Java application development, Spring Boot is one of the hottest topics. Since it has a built-in repository server, it is fast and helps build Java-based applications from scratch.

To ace your professional career in web-based application development, here is the best source for you to impress your interviewer. This article discusses some of the necessary Spring Boot interview questions.

Now, discussions aside, let’s start with the main course.

Fresher’s-Level Spring Boot Interview Questions

1) Why Spring Boot and not Spring instead?

Though Spring and Spring Boot rely on the same framework, Spring Boot has the most beneficial applications than what Spring has to offer when compared.

Version Management, Auto Configuration, Built-in repository server, Component Scanning, and many other such key features offered by Spring Boot make it more preferable than Spring Framework.

2) How does the Spring Boot Framework work?

The Spring-Based framework of Spring Boot uses annotations and automatically configures the dependencies of the application added to the project.

By using the @ComponentScan annotation, Spring Boot will be able to automatically scan applications of the class that contains the @SpringBootApplication annotation.

3) What is the @ComponentScan annotation used for?

On the class file, when the application initializes, Spring Boot scans for all the packages declared in it. By adding the @ComponentScan annotation, the class file will be able to scan all the components added to the project.

4) How do you create projects in Spring Boot using the Spring Initializer?

A Spring Boot project can be created by providing the project details and following the following steps:

- Navigate to Spring Initializr.

- Click on "New Project"

- Click on "Generate."

- Enter project metadata details.

- Click the Finish button.

5) What is Spring Initializer?

Spring Initializer is a web application that is capable of generating an initial Spring Boot project structure. This provides the basic structure of the project by solving the problem of setting up a new framework while starting a new project.

Intermediate-Level Spring Boot Interview Questions

1) What exactly are startup dependencies?

A special or particular dependency that sums up all commonly used dependencies for one particular feature is called a starter dependency. In a Spring Boot project, such dependencies can be added under the dependencies> section.

2) Describe Dependency Injection

Dependency Injection is the process of the Spring Framework where the searched beans are auto wired to the appropriate dependent class after identifying their dependencies.

3) What are Beans in Sring?

An object in a Spring class that is annotated with the @Component annotation; such classes are referred to as "beans" in Spring. These objects are managed by the Spring IoC container.

4) Brief Overview of Inversion of Control (IoC)

The Spring IoC Container is the core of the Spring Framework. The container uses Dependency Injection (DI) to manage the components such as configurations and dependencies that compile the application.

5) What are the Embedded Containers that Spring Boot Support?

Tomcat, Jetty, and Undertow are the three embedded containers that are supported with Spring Boot. With the setting unaltered, Spring Boot considers using Tomcat by default.

Advanced-Level Spring Boot Interview Questions

1) Is it possible to build a non-web-based application on Spring Boot?

Yes, it is possible. When the web dependencies in Spring Boot have been disabled from the class paths, a non-web application project can be worked on.

2) Can the embedded Tomcat server be overridden or replaced in Spring Boot?

Using the starter dependency, the embedded Tomcat server can be replaced with any other server. Based on the dependency server required for the project, embedded servers can be replaced or overridden.

3) Name some of the important features of using Spring Boot and explain one. 

- Spring Actuator

Spring Actuator is a feature that offers a wealth of information about an active Spring boot application. Actuator, for instance, can be used to discover which beans are generated in the Spring application context and which request paths are assigned to controllers.

4) What is the default port for Tomcat in spring boot?

The default port for the embedded Tomcat server is -id 8080. This can be altered by adding server properties with sever.port to the file application.property.

5) Brief about the uses of Profiles in spring boot

We work in a variety of contexts when developing the application, including development, quality assurance, and production, and each environment has different configuration needs. For instance, we might use a commercial Oracle or DB2 database for production instead of the embedded database we use for development. Even though the database management system (DBMS) is identical throughout the domain, the URLs would be distinct.

Spring offers the Profiles feature to maintain the independent setup of environments in a simple and clear manner.

Conclusion

This article briefs you on the most frequently asked Spring Boot interview questions and answers.

This 2024 update of the most frequently asked Spring Boot interview questions helps you understand and stay updated for your interviews and career building.

When considering web-based application development, you should become acquainted with the tools and frameworks used in application development.

Candidates gain all necessary information by understanding the concepts of Spring Framework and Spring Boot applications.

To learn more and better understand Spring Boot applications in Web-application development using Java-based frameworks, enroll now in Sprintzeal's Full Stack Developer Master Program certification training.

Do visit Sprintzeal's official website or Sprintzeal's all courses page to explore more related courses or any courses of your preference.

Table of Contents

• What is Spring Framework?
• What is Spring Boot?
• Fresher’s-Level Spring Boot Interview Questions
• Intermediate-Level Spring Boot Interview Questions
• Advanced-Level Spring Boot Interview Questions
• Conclusion

What is Spring Framework?

The Spring Framework is an open-source application framework with many features that can be used by any Java application. On the Java platform, spring framework extensions are used for building and developing web applications.

Suggested reading: JavaScript Interview Questions

What is Spring Boot?

Spring Boot is another open-source Java-based framework used by developers for building applications. Spring Boot helps developers iterate on programs faster than with other sources.

Spring Boot is one of the best backend developer frameworks used for building and developing web applications, allowing developers to design production-grade web applications.

When it comes to interviews about Java application development, Spring Boot is one of the hottest topics. Since it has a built-in repository server, it is fast and helps build Java-based applications from scratch.

To ace your professional career in web-based application development, here is the best source for you to impress your interviewer. This article discusses some of the necessary Spring Boot interview questions.

Now, discussions aside, let’s start with the main course.

Fresher’s-Level Spring Boot Interview Questions

1) Why Spring Boot and not Spring instead?

Though Spring and Spring Boot rely on the same framework, Spring Boot has the most beneficial applications than what Spring has to offer when compared.

Version Management, Auto Configuration, Built-in repository server, Component Scanning, and many other such key features offered by Spring Boot make it more preferable than Spring Framework.

2) How does the Spring Boot Framework work?

The Spring-Based framework of Spring Boot uses annotations and automatically configures the dependencies of the application added to the project.

By using the @ComponentScan annotation, Spring Boot will be able to automatically scan applications of the class that contains the @SpringBootApplication annotation.

3) What is the @ComponentScan annotation used for?

On the class file, when the application initializes, Spring Boot scans for all the packages declared in it. By adding the @ComponentScan annotation, the class file will be able to scan all the components added to the project.

4) How do you create projects in Spring Boot using the Spring Initializer?

A Spring Boot project can be created by providing the project details and following the following steps:

- Navigate to Spring Initializr.

- Click on "New Project"

- Click on "Generate."

- Enter project metadata details.

- Click the Finish button.

5) What is Spring Initializer?

Spring Initializer is a web application that is capable of generating an initial Spring Boot project structure. This provides the basic structure of the project by solving the problem of setting up a new framework while starting a new project.

Intermediate-Level Spring Boot Interview Questions

1) What exactly are startup dependencies?

A special or particular dependency that sums up all commonly used dependencies for one particular feature is called a starter dependency. In a Spring Boot project, such dependencies can be added under the dependencies> section.

2) Describe Dependency Injection

Dependency Injection is the process of the Spring Framework where the searched beans are auto wired to the appropriate dependent class after identifying their dependencies.

3) What are Beans in Sring?

An object in a Spring class that is annotated with the @Component annotation; such classes are referred to as "beans" in Spring. These objects are managed by the Spring IoC container.

4) Brief Overview of Inversion of Control (IoC)

The Spring IoC Container is the core of the Spring Framework. The container uses Dependency Injection (DI) to manage the components such as configurations and dependencies that compile the application.

5) What are the Embedded Containers that Spring Boot Support?

Tomcat, Jetty, and Undertow are the three embedded containers that are supported with Spring Boot. With the setting unaltered, Spring Boot considers using Tomcat by default.

Advanced-Level Spring Boot Interview Questions

1) Is it possible to build a non-web-based application on Spring Boot?

Yes, it is possible. When the web dependencies in Spring Boot have been disabled from the class paths, a non-web application project can be worked on.

2) Can the embedded Tomcat server be overridden or replaced in Spring Boot?

Using the starter dependency, the embedded Tomcat server can be replaced with any other server. Based on the dependency server required for the project, embedded servers can be replaced or overridden.

3) Name some of the important features of using Spring Boot and explain one.

- Spring Actuator

Spring Actuator is a feature that offers a wealth of information about an active Spring boot application. Actuator, for instance, can be used to discover which beans are generated in the Spring application context and which request paths are assigned to controllers.

4) What is the default port for Tomcat in spring boot?

The default port for the embedded Tomcat server is -id 8080. This can be altered by adding server properties with sever.port to the file application.property.

5) Brief about the uses of Profiles in spring boot

We work in a variety of contexts when developing the application, including development, quality assurance, and production, and each environment has different configuration needs. For instance, we might use a commercial Oracle or DB2 database for production instead of the embedded database we use for development. Even though the database management system (DBMS) is identical throughout the domain, the URLs would be distinct.

Spring offers the Profiles feature to maintain the independent setup of environments in a simple and clear manner.

Conclusion

This article briefs you on the most frequently asked Spring Boot interview questions and answers.

This 2024 update of the most frequently asked Spring Boot interview questions helps you understand and stay updated for your interviews and career building.

When considering web-based application development, you should become acquainted with the tools and frameworks used in application development.

Candidates gain all necessary information by understanding the concepts of Spring Framework and Spring Boot applications.

To learn more and better understand Spring Boot applications in Web-application development using Java-based frameworks, enroll now in Sprintzeal's Full Stack Developer Master Program certification training.

Do visit Sprintzeal's official website or Sprintzeal's all courses page to explore more related courses or any courses of your preference.