50 Spring Boot Interview Questions You Should Review
By Indeed Editorial Team
Published 14 July 2021
The Indeed Editorial Team comprises a diverse and talented team of writers, researchers and subject matter experts equipped with Indeed's data and insights to deliver useful tips to help guide your career journey.
Web developers often use microservices to build small, independent and easily maintainable applications. Open-source resources like Spring Boot help them streamline the implementation of microservices architecture. If you are a web developer, you may be required to understand Spring Boot and know some of the technical basics. In this article, we outline 50 Spring Boot interview questions and provide some example answers to help you prepare for your interview.
How do you prepare for a Spring Boot interview?
Whether you are a fresher or an experienced developer, here are some steps you can take to prepare for a Spring Boot interview:
Recall your previous experience using Spring Boot.
Review common questions and example answers.
Prepare answers to questions your interviewer may ask.
Top Spring Boot interview questions
Review these Spring Boot interview questions and answers for experienced developers and freshers to best prepare for your upcoming interview:
1. What is Spring Boot?
Spring Boot is an open-source resource that developers can use to create microservices, called spring applications, that make businesses more efficient. An interviewer may want the definition in your own words to assess your understanding of why Spring Boot is important.
Example: "Spring Boot is a Java-based framework for creating digital services that are testable, easily maintainable and manageable by a small team, fill business needs and can be independently deployed without a larger application."
2. What is Spring vs Spring Boot?
Being able to explain the differences between these two terms can demonstrate to the interviewer that you are well-versed in this resource. Consider explaining one term first and then the other to keep your answer organised.
Example: "Spring is a framework for web applications. The framework has tools and libraries that you can use to create custom applications. Spring Boot is a module of Spring that you can use to create a Spring application or project that can only run."
3. Discuss the advantages of using Spring Boot.
You can use this question to showcase the benefits you have experienced when using Spring Boot. Use the STAR method to explain a situation in which you used Spring Boot, the task you had to complete, the actions you took using Spring Boot and the results and benefits you gained.
Example: "There are several advantages to using Spring Boot, including ease of use. It also helps reduce the time and resources required for creating microservices, which increases your overall profitability. In my experience with Spring Boot, I used it to convert ChemCal Corp to microservices architecture. I handled all aspects of development, and using Spring Boot's autoconfigured starters allowed me to do this quickly and resource efficiently."
4. How do you set up a Spring Boot project?
This is a technical question that tests your knowledge of Spring Boot basics. A simple step process can provide a clear and concise answer to the question.
Example: "There are several ways to set up a project in Spring Boot. One way is to use the Spring Initialzr with Eclipse and Maven. First, launch the Initializr and choose the Group, Artifact and dependencies. Then, select Generate Project. Finally, you can choose to import your existing Maven project from Eclipse."
5. What is autoconfiguration?
This question is related to one of Spring Boot's more important features, autoconfiguration. This feature makes Spring Boot an attractive option for developers. So in a Spring Boot interview, you might be expected to define autoconfiguration thoroughly and explain why it is important to Spring Boot.
Example: "Autoconfiguration is an important feature of Spring Boot that was created out of a need to reduce the complexity of configuration in the Spring framework. Autoconfiguration does this by offering different starters, and depending on which starter you use, it configures the application differently. This saves developers time and makes Spring Boot easier to use than Spring."
6. How do you disable autoconfiguration in Spring Boot?
Because autoconfiguration is the default of Spring Boot, you may need to know how to turn it off. In your answer, explain how to the disable feature without having to write code. Keep in mind, some questions may ask you to write or read code and interpret it, and you should be prepared to do that too.
Example: "The exclude feature of the @EnableAutoConfiguration annotation allows you to disable autoconfiguration. Do this by using it within an applicable string of code."
7. What is the process of registering a custom autoconfiguration with Spring Boot?
This question assesses your understanding of the basic functionality of Spring Boot. However, bring with you a portfolio of Spring Book coding, if you have one, to display and demonstrate your knowledge of reading and writing code in the system, too.
Example: "Custom autoconfiguration is a class in Spring Boot that can be registered. To do this, the full name of the autoconfiguration should be entered into the META-INF/spring.factories file in the EnableAutoConfiguration key. However, if it is in Maven, it should be registered in the Maven directory file."
8. Can you list the available Spring Boot starters?
Spring Boot starters are the autoconfigured tools from which you base your microservices application. To answer this question, memorise and recall the starters. Then, consider listing other related items, like dependencies, key features and project options.
Example: "Some common starters are spring-boot-starter, spring-boot-starter-aop and spring-boot-starter-data-jpa. Spring-boot-starter is a core starter that has autoconfiguration support and more. Spring-boot-starter-aop is used for aspect-oriented programming, and spring-boot-starter-data-jpa is compatible with Hibernate. These are a few top starters, although there are more depending on your use case.”
9. Explain your experience with Spring Boot.
Successfully answering this question means coming prepared to discuss a time you developed and implemented microservices, especially if you did so using Spring Boot.
Example: "I have four years of experience using Spring Boot to resolve bandwidth issues as my company scaled to more users on its proprietary software platform."
10. What are the most important skills for a Spring Boot programmer to have?
This question assesses your understanding of the vital abilities needed to use Spring Boot effectively. It also encourages you to explain which of these abilities you have and how you excel at using them. Some skills you can describe include architecture knowledge, DevOps and containerisation skills, domain modelling, testing and security.
Example: "I pride myself on a deep knowledge of architecture and am CompTIA Security+ certified. My ability to create microservices architecture securely is an asset to the companies where I may work."
What are other interview questions asked about Spring Boot?
Here are some other common interview questions regarding Spring Boot, its functions, its uses and its tools:
Questions about Spring Boot basics and tools
Here are some questions about different tools used in Spring Boot:
What is Spring Boot architecture?
Define microservice in a simple way.
Describe some features of Spring Boot.
What are the common sources of external configuration?
What are Spring Bot DevTools, and why are they important?
What is Spring Actuator?
What is thymeleaf, and how do you use it?
What are the steps in using Spring Initializer?
Can you explain how to create a Spring Boot application using maven?
Define Spring Data.
How does Hibernate get chosen as the default implementation for JPA without configuration?
What are the differences between WAR and embedded containers?
Why do we need Profiles?
How do you use Profiles to configure environment-specific configuration?
Related: What Is Bootstrap?
Questions about Spring Boot functionality
These questions cover how Spring Boot functions in different situations:
What are the minimum requirements for a Spring Boot system?
How do you enable HTTP/2 support?
What is Spring Data REST?
Should you use Spring Data REST in real-world applications? Why or why not?
What is Spring Boot CLI, and how do you use it to execute a Spring Boot project?
The boundary of a transaction should start in which layer?
What is the difference between JPA and Hibernate?
How do you disable autoconfiguration?
Why would you set ReadOnly as true during Transaction management?
Are we able to create non-web-based applications using Spring Boot?
What are the advantages of the YAML file?
What error do you get if H2 is not in the classpath?
What is the default H2 database configured by Spring Boot called?
Questions about Spring Boot processes
An interviewer may ask these questions to see if you understand common and complex Spring Boot processes:
What happens in the background when a Spring Boot application is run as a Java application?
What is dependency management?
Can you change the port of the embedded Tomcat server in Spring Boot?
What are the steps in connecting a Spring Boot application to a database?
Explain the differences between @RequestMapping and @RestController annotations.
What is the difference between @RequestMapping and @GetMapping?
Explain the steps in creating a custom endpoint in Actuator.
Discuss the differences between the annotations @EnableAutoConfiguration and @SpringBootApplication.
What steps do you take to deploy Spring Boot applications as JAR and WAR files?
How do you deploy to a different server in Spring Boot?
Explain the process of connecting an external database.
What are the different ways to load YAML files?
How do you configure Log4j for logging?
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