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

Interview Questions and Answers

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.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

How can you change JDK version in Spring Boot?

To change the JDK version in Spring Boot, you can overwrite it by adding a java.version property tag as given in pom.xml:

<properties>
<java.version>11</java.version>
</properties>

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Ques 2

What is Spring Boot starter? How is it useful?

Spring Boot has many starters. They are a set of convenient dependency descriptors. Starter allows you to include these descriptors in your pom.xml.
For example, If you want to work with Spring MVC, you can include spring–boot–starter–web as a dependency in pom.xml.
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Ques 3

How can you access a value defined in the application? What is properties file in Spring Boot?

Use the @Value annotation to access the properties which is defined in the application.properties file.
@Value(”${custom.value}”)
private String customVal;
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Ques 4

What is the primary difference between Spring and Spring Boot?

Spring is a web application development framework based on Java. On the other hand Spring Boot is an extension of the spring framework which eliminated the boilerplate configuration required for setup a Spring application.
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Ques 5

How can you connect Spring Boot to the database using JPA?

Spring Boot supports spring-boot-starter-data-jpa, which helps you to connect spring application with a relational database.
<dependency>    
    <groupId>org.springframework.boot</groupId>    
    <artifactId>spring-boot-starter-data-jpa</artifactId>    
    <version>2.2.2.RELEASE</version>    
</dependency>  
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Ques 7

What are Spring Boot Starter Projects?

Starters in Spring Boot are a set of convenient descriptors that are included in Spring Boot applications. It comes with a variety of Spring-related technology which makes the entire process of the application development much easier.
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Ques 9

How to scan all the beans and package declarations in Spring Boot?

Spring Boot application scans all the beans and package declarations when the application initializes. You need to add the @ComponentScan annotation for your class file to scan your components added in your project.
@ComponentScan
public class DemoApplication {
   public static void main(String[] args) {
      SpringApplication.run(DemoApplication.class, args);
   }
}
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