Ever since its official release in early 2014, Spring Boot, the open-source, Java-based framework has dominated. It was among the most popular in the web development industries. Employees and developers alike preferred it to others primarily because it simplified and streamlined the process of developing complex applications. Spring Boot eliminated a few key pain points related to dependency management and configuration. It also works wonders when looking to scale and ensures a robust web application in the right hands.
Considering its many upsides, companies are always looking to hire Java developers with Spring Boot knowledge. In the past, you could expect a few questions about the Spring framework, but Spring Boot was just an add-on and not a focus. However, this isn’t the case anymore, and interviewers will ask more targeted questions to ascertain your level of expertise. To give yourself the best shot at successfully getting the job, here are the top Spring Boot interview questions to be ready for.
Is there a difference between Spring and Spring Boot?
There are 3 main differences between Spring and Spring Boot.
|Functions as a dependency injection framework.||It is a suite with numerous pre-configured frameworks, thus eliminating the need for boilerplate configuration.|
|Utilises XML based configuration.||Uses annotations.|
|Generally used to manage Java classes or beans.||Generally utilised to write production-ready code.|
Besides these 3 differences, it is important to highlight the fact that Spring require a great deal of boilerplate configuration. As a result, Spring takes longer to set up and is comparably more tedious to work with.
What is an actuator?
An actuator, in Spring Boot, is a provision that allows you manage and monitor applications. It has HTTP endpoints and is loaded with production-ready features that enable functionality. For any developer, it is crucial to the entire process. An actuator dependency works by identifying the metrics and making them available as an endpoint within the application.
This is done by retrieving all the information it needs from the web. With an actuator, you can identify several factors, including CPU usage, health status of the application, beans, and much more. Giving a thorough answer to this important question can showcase your Spring Boot mastery!
Are there any advantages of Spring Boot?
There are many advantages to using Spring Boot, and here are some of the more prominent ones.
- It allows you to create Spring applications using java -jar.
- Spring Boot enables a developer to embed Undertow, Tomcat, or Jetty directly without needing to deploy any WAR files.
- Spring Boot configures Spring automatically, and whenever possible.
- It helps make Maven configuration a lot simpler by providing ‘starter’ POMs
What is auto configuration in Spring Boot?
Auto configuration is a process through which all infrastructural beans are automatically configured. The process declares built-in objects or beans for a given Spring-specific module, be it spring security or JPA, or others, with respect the dependencies present in the class path.
Auto configuration eliminates the need to write java config code or XML code explicitly for that purpose. To use this feature of Spring Boot, use the annotation ‘@EnableAutoconfiguration’ or ‘@SpringBootApplication’.
Can you deploy a Spring Boot application in tomcat?
It is possible to do so as Spring Boot has a functionality for it. Whenever you create and run a Spring Boot application, it automatically detects the tomcat server and deploys the application to it. After executing successfully, you can then launch your rest endpoints and illicit a response.
How do you bootstrap in Spring Boot?
Bootstrapping in Spring Boot is fairly simple and can be done using Spring Initialiser. All you have to do is go to official website, choose the right version, and add the required dependencies, which include artifactID, groupID, and others. Next, you have to create the rest endpoints, and then run the project you’ve built. This is the simple process to bootstrap a Spring Boot application.
What are the basic annotations in Spring Boot?
While there are numerous annotations in Spring Boot, the primary annotations are within the sub-package of org.springframework.boot.autoconfigure.
The basic annotations here are:
- @EnableAutoConfiguration: This enables Spring Boot to identify auto-configuration beans on its classpath before automatically applying them.
- @SpringBootApplication: This annotation is used to denote the main class of the application. It combines @EnableAutoConfiguration, @Configuration, and @ComponentScan annotations with their default attributes.
Do developers need Spring profiles?
Typically, it is required to have Spring profiles to ensures easy management of configurations. This is a solution mainly targeted for enterprise applications as developments happens over a range of environments, be it QA, Dev, or Prod. In each of these, the configuration properties differ and thus, require better management to avoid complications. Spring profiles provide a solution in this regard, as they allow you to separate the configuration for each of these environments. As a result, you don’t have to maintain these properties within the program. Instead, separate files can be created to pick up the correct configuration.
What are starters in Spring Boot?
Starters are a functionality provided in Spring Boot to speed up development. Simply put, these are dependency descriptors that can be included in the application. They are convenient to use and starter-friendly.
What is an RAD model?
RAD stands for the Rapid Application Development process, which follows the waterfall model. Here, development takes place in short periods of time and through several iterations. Generally, in the software development lifecycle, the RAD model has the following phases:
- Business Modelling
- Data Modelling
- Process Modelling
- Application Generation
- Testing and Turnover
Many of these interview questions are designed to test your proficiency in Spring and Spring Boot. Leading employers even test your experience with development and the different models utilised. As a result, preparing for these is sure to add to your knowledge bank and help you stand out as a deserving employee and developer. To complement these preparation efforts, be sure to sign up for Talent500. This talent-discovery platform aligns your profile with leading Fortune 500 companies and global MNCs to help you get the job of your dreams.