10 Critical Spring Boot Interview Questions and Answers [For Beginners & Experienced] in 2021

Editorial TeamJanuary 12, 2022

4,790 3 minutes read

10 Critical Spring Boot Interview Questions and Answers [For Beginners & Experienced] in 2020

These days, Spring boot interview questions are becoming extremely widespread for Java developers. Spring Boot is an open-source Java-based spring module that provides highly effective options for the fast development of deployment-ready applications. It’s the most used and finest java framework for the event of scalable microservices and web applications.

If you wish to grow to be a domain expert, you may have come to the suitable place. We now have curated some probably the most repeatedly asked spring boot interview questions and answers that will help you to crack the interview.

Basic Spring Boot Interview Questions And Answers

1. What’s Thymeleaf in Spring Boot?

It’s a Java-based server-side template engine that provides elegant and natural templates for a web application.

The primary benefits of Spring Boot are:

It reduces development and testing time.
It makes use of JavaConfig instead of XML.
It gives an opinionated growth approach.
It provides starter projects or defaults for agile development.
No separate web server is required; therefore there isn’t any have to boot up Glassfish, Tomcat, or another server.

2. Are you able to name and briefly clarify all of the spring boot components/features?

With this query, the interviewer intends to gauge the theoretical knowledge of your concepts. When you have earlier expertise within the area or labored on any Spring Boot projects, present the reply with examples.

The primary options of Spring Boot are

1. Starter dependency

There are a lot of dependencies within the Spring framework, and this function aggregates them together. Spring Boot comes filled with a number of starter dependencies to boost productiveness.

Few of the Spring Boot Starters are Test Starter, Web Starter, Mail Starter, and extra. As an example, if we need to use JPA and Spring for database access, we will add this starter dependency within the project-spring-boot-starter-data-jpa.

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2. Auto-Configuration

This function scans the classpath and searches the libraries/Jars within the classpath to supply the required configuration to design and run the application.

For instance, whereas creating an application with Spring Boot, if there’s a Thymeleaf.jar present within the classpath, it automatically can align the Thymeleaf template resolver and different settings.

3. Spring Initializer

It’s a web application that simplifies the method of the project arrange by creating the preliminary challenge structure and build scripts. It will increase productiveness by decreasing development time.

4. Spring Actuator

Actuators are extremely vital for microservices as they permit deployment-ready options like auditing, health check-up, log info, and so on. for working Spring boot applications. Actuators have built-in management endpoints that are secured by default.

For instance:

/beans– it exhibits all the list of all Spring beans in your application.

/health— it shows application health info by monitoring the production system

5. Spring CLI

This function permits the developers to make use of Groovy for writing the Spring boot application, therefore leading to a extra concise code.

3. What’s Spring Boot, and how is it totally different from Spring?

It takes the Java development with Spring to the next level and simplifies the event by removing main pain points related to dependency, configuration, and management. The variations are listed beneath.

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Spring

Spring Boot

It’s a Java-based web application framework.

It’s a module of Spring used for creating microservices.

It’s quite difficult, making it troublesome to use.

It’s simpler and extra robust as in comparison with the spring framework.

It provides libraries and instruments to create personalized web applications.

It creates stand-alone spring software projects that may run/ execute.

It takes an un-opinionated view.

It takes an opinionated view as it will possibly determine which defaults to deploy the configuration.

It requires XML configurations.

It doesn’t require XML configurations.

4. What’s the need for Spring Boot?

It is likely one of the mostly requested Spring Boot Interview questions, and you possibly can reply it by mentioning vital benefits of Spring Boot.

Whereas Spring provides developers a super environment to develop large applications, the amount of configuration and its complexity makes it difficult to take action.

Right here is the place Spring Boot comes to rescue. Its options like pre-built templates and auto-configuration enable developers to make use of current spring functionalities with extra ease, minimal effort, and most effectivity.

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The primary benefits of Spring Boot are:

It reduces development and testing time.
It makes use of JavaConfig instead of XML.
It gives an opinionated growth approach.
It provides starter projects or defaults for agile development.
No separate web server is required; therefore there isn’t any have to boot up Glassfish, Tomcat, or another server.

5. What embedded containers are supported by Spring Boot?

Spring Boot supports three embedded containers:

Tomcat (used by default)
Undertow
Jetty

Technical Spring Boot Interview Questions And Answers

1. Describe spring-boot-starter-parent?

It’s a distinctive starter which provides jars to the classpath for straightforward Maven or Gradle dependency management.

2. How and where are you able to define properties in Spring Boot?

We will use the application.properties file to define options. This file will get automatically downloaded by Spring Boot and is used for application configuration.

3. What do you perceive by the shutdown within the actuator?

It’s a management endpoint that enables for a easy and correct shutdown of an application. It isn’t approved by default, however it may be enabled through the use of management.endpoint.shutdown.enabled=true.

4. Are you able to disable explicit auto-configuration in spring boot? Clarify how?

Sure, we can do that by

Utilizing the exclude attribute of @EnableAutoConfiguration

@Configuration

@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})

public class CustomConfiguration {}

utilizing the exclude attribute for @SpringBootApplication annotation

@SpringBootApplication(exclude= DataSourceAutoConfiguration.class)

public class CustomApplication {}

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5. Can Spring Boot even be used to create non-web applications?

Sure, Spring Boot helps the development of each web and non-web applications. We have to take away web dependencies from the classpath and the application context to create a non-web application.

6. What’s Spring Boot dependency management?

You’ll be able to clarify that Spring Boot automatically manages configuration and dependencies with out even stating the model for any of these dependencies.