45+ Spring Boot Interview Questions You Must Review

Safalta Expert Published by: Priya Bawa Updated Tue, 20 Jun 2023 02:31 PM IST

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Describe the word, Spring Boot.
It is a Spring module that combines the Spring framework with Rapid Application Development. Spring modules are used to develop Spring-based applications that need the configuration of a few Spring files. Boost your Skills by learning: Digital Marketing

Table of Content:
1) In Eclipse, how can I start a Spring Boot project?
2) Describe how to use Maven to develop a Spring Boot application.
3) Explain the effect of Spring Boots.
4) Discuss the RAD model's many stages.
5) Describe the Spring Actuator and its benefits.
6) What exactly are startup dependencies?

7) Can you describe what occurs in the background when you Run as Java Application a Spring Boot Application?
8) Why was Spring boot created?
9) What is the procedure for running a Spring Boot app on a custom port?
10) What exactly is dependency management in Spring Boot?
11) What accurately is a spring boot actuator?
12) How Do You Deploy Spring Boot Web Apps as Jar and War Files?
13) How does one go about activating a new autoconfiguration with Spring Boot?
14) What exactly is Spring Boot CLI and what are its advantages?
15) What exactly is a Spring Initializer?
16) Would you use Spring Boot with non-Spring-based applications?
17) Describe the Spring boot modules.
18) Could you please list the Spring Boot starters that are available?
19) What exactly are Spring Boot's DevTools?
20) Can the integrated Tomcat server's port be changed in Spring Boot?
21) How do you make a war file in Spring Boot?
22) What precisely is a spring boot actuator?
23) Describe Thymeleaf and its application.
24) Describe Spring Data.
25) What exactly is a spring-boot-starter-parent?
26) What are actuators in Spring boots and why should you use them?
27) Describe your Spring Boot experience.
28) Can you describe how to use Spring Boot to deliver to a separate server?
29) What exactly is spring boot auto configuration?
30) Explain why Spring Boot DevTools are required.
31) What exactly is Thymeleaf?
32) What exactly is Spring Boot CLI and what are its advantages?
33) What exactly is dependency injection?
34) Would Spring Boot be used to create non-web software?
35) Mention the benefits of the YAML file over the Properties file, as well as the many ways to load the YAML file in Spring boot.
36) In Spring Boot, describe the RestMapping annotation.
37) How can I fix a Whitelabel error code in a spring boot application?
38) How is Hibernate selected as the default JPA implementation without any configuration?
39) Explain Spring Boot Administration
40) These are the most critical skills to have as a Spring Boot programmer.
41) Where should the boundaries of a transaction begin?
42) Why is componentScan used in class files?
43) Define the phrase Spring Initializer.

44) What exactly is bootstrapping in a spring boot?
45) In a Spring Boot application, where may you define properties?
46) What do you know about Spring Data?
 

In Eclipse, how can I start a Spring Boot project?
Spring Initializer is one way to start a spring boot installation in eclipse. You may go to the spring main site and enter parameters such as version, maven or Gradle project, groupId, artifactId, and needed components, and then click CREATE PROJECT. When the project is finished, you may download it, unpack it, and import it into Eclipse or STS.
And you can see that your project is finished! To install Spring Boot in Eclipse, go to the Eclipse IDE, choose "Help," then go to the Eclipse Marketplace, input Spring IDE, and click the Finish button.

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Describe how to use Maven to develop a Spring Boot application.
There are several options for creating a Spring Boot app using maven, here are a few:
  • Spring Boot CLI
  • Spring Maven Project
  • Spring Project Wizard
 
Explain the effect of Spring Boots.
Spring Boot has the following benefits:
  • Provides a command-line interface (CLI) tool for developing and testinprogramses.
  • Spring Boot offers an opinionated viewpoint in order to decrease programmer effort and streamline maven settings.
  • Provides hang apps with a variety of non-functional elements that are shared by many different types of projects.
  • It includes Spring Boot starts to assure dependency control and offers a variety of security metrics.
 
Discuss the RAD model's many stages.
  • Data Modeling: The information gathered via business modelling is converted into a set of data items relevant to the business.
  • Business Modeling: The product is built to show the flow of data and dissemination among multiple business venues.
 
Describe the Spring Actuator and its benefits.
Spring Actuator is a fantastic Spring Boot feature that allows you to examine what is going on within a user program. So, if you debug your application and need to study logs, you need to comprehend what is going on in the application, right? In this case, the Spring Actuator makes it simple to access functionality like identifying beans, CPU consumption, and so on.

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The Spring Actuator makes it very simple to contact manufacturing REST APIs and retrieve data from the web. Spring Security's contents negotiation approach is used to secure certain points.
 
What exactly are startup dependencies?
Spring boot starting is a maven archetype that contains a list of all the necessary transitive dependencies to begin a certain feature.
For example, in order to create a web application, we must import the spring-boot-starter-web requirement.
 
Can you describe what occurs in the background when you Run as Java Application a Spring Boot Application?
When you run a Spring Boot program as "Run as Java application," it immediately starts the Tomcat server when it realizes that you are constructing a web service.
 
Why was Spring boot created?
Answer: Spring boot was created as a Spring framework extension to address the restrictions of the Spring framework. Spring boot makes use of annotation, boilerplate setup, and shorter code length to assist developers in quickly deploying and creating independent Spring apps with little configuration overhead.
Spring boot also includes openers that address dependency implicitly, embedding clients such as Tomcat and Jetty, in-memory data support, and a CLI tool for testing and building applications.
 
What is the procedure for running a Spring Boot app on a custom port?
To execute a Spring Boot program, provide a server.port parameters in application.properties. For instance, server.port=8050
 
What exactly is dependency management in Spring Boot?
Spring Boot resource administration is used to automatically follow structured settings without requiring you to declare the number for any of those needs.
 
What accurately is a spring boot actuator?
One of the nicest elements of a spring boot is the actuator, which has production-ready functionality to help us evaluate and control your application. You may monitor what is going on inside the running program by using an actuator.
The actuator dependency calculates the statistics and exposes them as a new destination in your application, as well as retrieving the necessary data from the internet. With the actuator, you can detect beans, the health of your program, CPU use, and many other things. You may construct a customized endpoint.
 
How Do You Deploy Spring Boot Web Apps as Jar and War Files?
Traditionally, a web application is packaged as a WAR file but then deployed to an external server. This enables us to run numerous programs on one server. This was an excellent technique to preserve resources when CPU and disk were scarce. However, times have changed. Now that computer hardware is reasonably priced, the focus has shifted to server setup. A little error in server configuration during deployment might have disastrous repercussions.
 
How does one go about activating a new autoconfiguration with Spring Boot?
This quiz tests your knowledge of Spring Boot's fundamental functionality. However, if you have a sample of Spring Book coding, bring it with you to show and showcase your skills in reading and creating code in the system.
 
What exactly is Spring Boot CLI and what are its advantages?
One of the most crucial Spring Boot interview guides. Spring Boot CLI is a command line tool in Spring Framework that can launch Groovy File routines without coding, allowing developers to quickly construct Spring Framework applications.
  • It makes use of the Grape dependence organization and the Groovy compiler.
  • It resolves dependencies and runs the application using AutoConfigurate, Spring Boot Starter, and AutoConfigurate features.
  • It deals with internal service errors.
 
What exactly is a Spring Initializer?
Spring Initializer is an online tool that assists you in creating a preliminary spring boot project management plan and gives a maven or Gradle file from which you may build your code. It overcomes the difficulty of establishing a framework when beginning a new project from scratch.
 
Would you use Spring Boot with non-Spring-based applications?
No, it is just not feasible since Spring Boot is just for Spring applications.
 
Describe the Spring boot modules.
The framework is made up of the four main elements listed below:
  • Spring installation has been simplified thanks to Auto Configurator. Command Line Interface (CLI): Spring Boot software may be run and tested from the command prompt.
  • Starter POMs: Combines related or shared dependencies into a single dependency. Spring Boot Starter, for example, simplifies project build requirements by requiring a collection of database-related jar files such as spring JDBC, Spring ORM, and Spring Transaction to add entries to a database.
  • Actuators: Provide spring boot apps with control ports and metrics.
 
Could you please list the Spring Boot starters that are available?
Spring Boot starters are the pre-configured tools on which your microservices application is built. Memorize and recollect the beginnings to answer this question. Consider mentioning more related elements, such as dependencies, essential features, and project choices.
 
What exactly are Spring Boot's DevTools?
Boots for Spring DevTools assists you in increasing developer productivity. As a result, you do not need to relaunch your software per time you make changes. It helps the developer to republish changes without having to restart the server.
 
Can the integrated Tomcat server's port be changed in Spring Boot?
Yes, using the project properties file, we may modify the port of the integrated Tomcat server. In this file, add a "server.port" field and apply to any port you choose. For illustration, if you wish to set it to port 8081, you must use server.port=8081. When you specify a port number, Spring Boot will immediately load the project settings file and apply the necessary parameters to the app.
 
How do you make a war file in Spring Boot?
To make a war file in spring boot, specify every repackaging file as the military conflict in your pom.xml file (if it is a maven project).
 
Then just run maven clean but also install to begin creating your application. When the build is complete, just navigate to your Target folder and look for the.war file created for your program.
 
What precisely is a spring boot actuator?
When you wish to push your application to production, you may use Spring Boot Actuator to keep an eye on it. It allows you to regulate your application through the use of HTTP endpoints.
 
Describe Thymeleaf and its application.
Thymeleaf, a Java server-side template engine, is utilized sin tandalone and online contexts alongside Spring Boot. The template can handle plain text, HTML, JavaScript, CSS, XML, and Raw. Thymeleaf provides an attractive and maintainable template creation method.
Thymeleaf is completely integrated with the Spring framework and provides a well-structured manner of developing templates. The thymeleaf template is used in online applications by many reputable firms like HCL Technologies, Nokia Networks, the University of Cambridge, JP Morgan, Canadian Life, Deutsche Bank, and others.
 
Describe Spring Data.
Spring Data intends to simplify the usage of relational and non-relational networks, cloud-based mobile networks, and certain other access control technologies for developers. So, in essence, it facilitates data access while retaining the underlying data.
 
What exactly is a spring-boot-starter-parent?
It is a unique starter that simplifies Gradle or Maven asset management by bringing jars to your classpath.
 
What are actuators in Spring boots and why should you use them?
Spring Boot motors provide a list of built-in HTTP ports that allow you to add actuator dependence. The Spring boot actuator library delivers monitors and health metrics from production-ready apps that do not require any coding or configuration via REST-like endpoint URLs.
The Spring boot actuator is used to get information about running applications' actions such as info, dump, env, metric, and health. JMX beans and HTTP endpoints are used to interface with the Spring boot actuator.
 
Describe your Spring Boot experience.
To successfully answer this question, you must be prepared to detail a moment when you developed and manufactured microservices, preferably if you used Spring Boot.
 
Can you describe how to use Spring Boot to deliver to a separate server?
Follow the steps below to deploy a separate server using Spring Boot:
  • Create a WAR file from the program.
  • Then, upload the WAR file to your preferred server.
 
What exactly is spring boot auto configuration?
Auto Configuration is the technique through which Spring Boot configures all infrastructure beans automatically. Based on the dependencies in your application's classpath, it announces the built-in beans/objects of the spring-specific specific module such as JPA, spring security, and so on.
 
Explain why Spring Boot DevTools are required.
DevTools disables all design caching by default. Only after a browser refresh will the changes be visible.
Automatic browser refresh: When DevTools is integrated in a project, the 'LiveReload' server is activated, causing your browser to resupply quickly anytime changes are made to CSS stylesheets, JavaScript, Template engine, and so on.
 
What exactly is Thymeleaf?
Thymeleaf is a Java template engine that is frequently used to produce HTML views for web pages and applications. However, because it is a broad sense framing engine, it may be used outside of web programs.
 
What exactly is Spring Boot CLI and what are its advantages?
Spring Boot CLI is a task platform that lets you to use Groovy to develop a spring-based java application.
You do not need to define getter and setter methods, access modifiers, or return statements, for example. When you employ the JDBC template, it will load automatically.
 
What exactly is dependency injection?
Dependency injection refers to the technique of injecting interdependent bean objects into goal bean objects.
  • Setter Injection: By executing the setter method, the IOC box will inject a bean object into the target bean object.
  • Constructor Injection: By executing the target bean function Object() { [native code] }, the IOC container injected the independent bean objects into the target bean object.
  • Field Injection: Using the Reflection API, the IOC wrapper will inject the dependency field object into the targeting bean object.
 
Would Spring Boot be used to create non-web software?
Yes, by eliminating the web resources from the classpath and modifying the way Spring Boot builds the application context, we can consider the non-application.
 
Mention the benefits of the YAML file over the Properties file as well as the many ways to load the YAML file in Spring boot.
The YAML file has an advantage over a properties file in that the data is kept in a hierarchical fashion. As a result, debugging issues becomes easier for engineers. When you have the SnakeYAML plugin on your classpath, the SpringApplication class uses the YAML file as an option for properties. The following are the many methods for loading a Symbol in Spring Boot:
  • Make use of YamlProperties.
  • To import YAML as a Map, use YamlMapFactoryBean.
  • Loading YAML as Properties in FactoryBean
 
In Spring Boot describe the RestMapping annotation.
Mapping annotations are employed by the controller at both the class and method levels. The annotation associates a certain pattern or request flow with a controller. Method-level annotation also applies additional mappings unique to handler methods.
 
How can I fix a Whitelabel error code in a spring boot application?
Custom Error Controller- you will extend the ErrorController interface supplied by SpringFramework and then override its getErrorPath() method to return a custom route once such an error occurs.
 
How is Hibernate selected as the default JPA implementation without any configuration?
When we utilize Spring Boot Auto Configuration, the spring-boot-starter-data-jpa dependency is immediately added to the pom.xml file. Because this requirement is transitively dependent on JPA and Hibernate, Spring Boot auto-configures Hibernate as the default JPA implementation if it encounters Hibernate on the classpath.
 
Explain Spring Boot Administration
Spring Boot admin is a cooperative event that aids in the management and monitoring of Spring Boot installations.
 
These are the most critical skills to have as a Spring Boot programmer.
This question tests your knowledge of the essential skills required to utilize Spring Boot efficiently. It also pushes you to describe which of these skills you possess and how you excel at employing them. Architecture expertise, DevOps and containerization capabilities, domain modeling, testing, and security are some examples of talents you might mention.
 
Where should the boundaries of a transaction begin?
Because the functionality for the business arrangement is located in this layer, the transaction boundary should begin there.
 
Why is componentScan used in class files?
The @ComponentScan annotation in the class is used in conjunction with the @Configuration annotation to tell Spring packages to look for annotated components in the class and to specify both reference bundles and their classrooms using @ComponentScan features, particularly regarding base packages or thebasePackageClasses.
 
Define the phrase Spring Initializer.
Spring initializer is a web-based application that may help you construct an initial project structure.
 
What exactly is bootstrapping in a spring boot?
Spring Initializer is one method for bootstrapping your spring boot application. You may go to the spring website and choose your form, as well as enter your group, artifact, and any needed prerequisites. Then you can define your standpoints, compile your project, and execute it.
You have successfully bootstrapped your spring boot application.
 
In a Spring Boot application where may you define properties?
Spring Boot settings can be defined in a file named application.properties. It assists you in compiling this file, or you may use Spring Initializer to construct this file.
 
What do you know about Spring Data?
This is one of the most often requested Java Spring Boot interview guides in software engineering jobs. Spring Data is a SpringSource Project that enables developers in the Spring framework to quickly access cloud-based services, database access methods, and relational and non-relational databases.
 
 
  It is a Spring module that blends Spring with Rapid Application Development. Spring module can be used to create Spring-based applications that require only a few Spring files to be configured.

What exactly does the Spring Boot Application annotation do?

The SpringBootApplication annotation in Spring Boot is used to identify a configuration class that specifies one or more Bean methods and also initiates auto-configuration and part scanning. It's the same as declaring a class with the annotations Configuration, Enable Auto Configuration, and ComponentScan.

Can we use Spring Boot with non-spring-based applications?

Yes, you may use the initial dependencies to change the Embedded Tomcat with any other server. You may use spring-boot-starter-jetty or as a dependent for that depending on your needs.

In Spring Boot, which injection is superior?

Construction injection is superior since I can declare my reliance as final, which is not available while injecting properties. Your dependency should be final, meaning they should not be changed by the application.

Is Spring Boot used on the front or back end?

Spring Boot is a backend framework that has established itself as a prominent participant in the enterprise Java industry. It enables Java developers to rapidly and easily begin developing web apps.

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