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

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Ques 1

What is DevTools in Spring Boot?

Spring Boot DevTools helps you to increase the productivity of the developer. So, you do not require to redeploy your application every time you make the changes. It allows the developer to reload changes without the need of restarting of the server.
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Ques 5

What is a Spring Boot Actuator?

Spring Boot Actuator allows you to monitor and manage your application when you want to push it for the production. It helps you to control your application by using HTTP endpoints.
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

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Ques 9

Explain thymeleaf in Spring Boot.

Thymelaf is a server-side Java template engine for a web application. It helps you to bring elegant natural templates to your web application.
<dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
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Ques 10

What is a shutdown in the actuator?

A shutdown is an endpoint that helps application to be shut down properly. This feature is not enabled by default.
However, you can use it by setting command: management.endpoint.shutdown.enabled=true in your application.properties file.
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Ques 11

Is it possible to replace or override the Embedded Tomcat server in Spring Boot?

Yes, it is possible to replace the Embedded Tomcat with any other servers by using the starter dependencies. For that, you can use spring-boot-starter-jetty or as a dependency for according you to your need.
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Ques 15

What is LiveReload in Spring Boot?

LiveReload is a spring-boot-devtools module that includes LiveReload server to trigger a browser refresh when a resource is changed. LiveReload server extensions are available freeware for Firefox, Chrome, and Safari.
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Ques 16

What are the major benefits of spring Externalized Configuration?

Externalized Configuration helps to work with the same code in different environments. Developers can use YAML files, properties files, command-line arguments, and environment variables to externalize configuration.
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Ques 17

What do you mean by hot-swapping in Spring Boot?

It is a way to reload the changes without restarting Tomcat, or Jetty server. Eclipse and Many other IDEs support bytecode hot swapping. If you make any changes that don’t affect the method signature, it should reload without side effect.
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Ques 19

What is mean by spring batch?

Spring Boot Batch provides code reusability which is important when working with large numbers of records, including transaction management, logging, skipping, job processing statistics, and job restarts.
<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-batch</artifactId>
</dependency>
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Ques 20

Explain CORS in Spring Boot?

CORS stands for Cross-Origin Resource Sharing is a  mechanism implemented by browsers and helps users to authorize cross-domain requests. This mechanism serves as an alternative to less secure and less powerful hacks of the kinds of IFrame or JSONP.
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Ques 21

How can you set active profile in Spring Boot?

Follow the following methods to set an active profile in Spring Boot.
  • Pass this profile as an argument when you launch the Spring Boot application (java -jar -Dspring.profiles.active=dev Sample-1.0-SNAPSHOT.jar).
  • Set active the active profile in application.properties file (spring.profiles.active=dev).
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