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Home / Interview Subjects / Spring Boot
WithoutBook LIVE Mock Interviews Spring Boot Related interview subjects: 39

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Know the top Spring Boot interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top Spring Boot interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Freshers / Beginner level questions & answers

Ques 1

What is Spring Boot?

Spring Boot is an open source Java-based framework used to create a microservice. It is developed by Pivotal Team and is used to build stand-alone and production ready spring applications.
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Ques 2

Why to use Spring Boot?

You can choose Spring Boot because of the features and benefits it offers as given here:
  • It provides a flexible way to configure Java Beans, XML configurations, and Database Transactions.
  • It provides a powerful batch processing and manages REST endpoints.
  • In Spring Boot, everything is auto configured; no manual configurations are needed.
  • It offers annotation-based spring application.
  • Eases dependency management.
  • It includes Embedded Servlet Container.
  • Creates production ready microservices.
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Ques 3

Mention some advantages of Spring Boot.

Here are some major advantages of using spring-boot:
  • Helps you to create a stand-alone application, which can be started using java.jar.
  • It offers pinpointed started POMs to Maven configuration.
  • Allows you to Embed Undertow, Tomcat, or Jetty directly.
  • Helps you to configure spring whenever possible automatically.
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Ques 4

How to create a Spring Boot application using Spring Initializer?

It is an web application provided by Spring on its official website. However, you can also create Spring Boot project by entering project details.
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Ques 5

What are the ways to create Spring Boot project?

Basically, there are following four ways in which we can create Spring Boot Project :
  • Using Spring.io initializer.
  • Using Eclipse or any similar IDE and Maven simple project.
  • Using Spring Tool Suite.
  • Using CLI.
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Ques 6

What are the advantages of microservice?

Following are the major advantages of microservice:
  • It makes development fast and easy.
  • Compatible with all container.
  • Reduce production time.
  • It is a lightweight model that supports a major business application.
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Ques 7

Explain different types of dependency injection.

There are two types of dependency injection in Spring Boot. They are as follows:
  • Constructor based dependency injection: It is a technique in which one class object supplies the dependency of another object.
  • Setter-based dependency injection: It is a dependency injection in which the framework injects the primitive and string-based values using setter method.
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Ques 8

What are the commands to run and stop Spring Boot executable jar file?

You need to open cmd or shell window command and use
java -jar
To run application:
$ java -jar spring-boot-sample-0.0.1-SNAPSHOT.jar
To stop: 
Press ctrl+C
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Ques 9

What is the process that you need to follow to run Spring Boot application on the custom port?

In order to run a Spring Boot application, you require to put server.port property in application.properties. 
For example, server.port=8050
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Ques 11

What is the name of the configuration file which you can use in Spring Boot?

The configuration file used in Spring Boot projects is called application.properties. It is an important file which allows you to override your default configurations.
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Ques 12

How are properties defined in Spring Boot and where?

You can define properties in the application.properties file exists in the classpath.
Example: configure default DataSource bean
database.host=localhost
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Ques 13

Explain @RestController annotation in Spring Boot?

The @RestController annotation helps you to add @ResponseBody and @Controller annotations to the class to write RESTFul web service APIs.
You can also import org.springframework.web.bind.annotation package in your file.
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Ques 14

Where can you define properties in Spring Boot application?

You can define properties of Spring Boot into a file called application.properties. It helps you to create this file manually, or you can use Spring Initializer to create this file.
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Ques 15

What are the Spring Boot properties?

Spring Boot offers various properties which can be specified inside our project’s application.properties file. It helps you to set values like a server-port number, database connection configuration, etc.
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Ques 16

Explain Auto-Configuration in Spring Boot.

Auto-configuration is used to configure Spring application automatically based on dependencies of classpath parameter. It makes development faster and easier.
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Spring vs Spring BootSpring vs Spring BootNodeJS vs Spring BootNodeJS vs Spring BootSpring MVC vs Spring BootSpring MVC vs Spring Boot

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