Top 10 Spring Boot Interview Questions and Answers

1. What is Spring boot?
   Spring Boot makes it easier for you to create production ready applications in no time. It is an opinionated view to create Spring application quickly. It follows convention over configuration. In simple terms, it comes with default configurations for most of the Spring projects, you don’t need to do much to bootstrap any spring application.

2. Why did you use Spring boot in your application?
   As discussed earlier, Spring boot makes it easier for you to create Spring application, it can save a lot of time and efforts.

For example: Let’s say you want to create Spring boot project with activeMQ. You can simply use “spring–boot–starter–activemq” as artifact Id, it will take all the defaults and create Spring application with ActiveMQ configured. Let’s say you don’t want to use inbuilt activeMQ, you can simply override “spring.activemq.broker-url” in application.properties to use external ActiveMQ.

1. Can you list advantages of Spring boot? Advantages of Spring boot are:

It provides a lot of default configurations which help you to create Spring application faster.
It comes with embedded tomcat or jetty server, so you don’t have to deploy jar.
It reduces development code by avoiding a lot of boilerplate code.
It increases productivity as you can create Spring application quickly.
It provides a lot of starter project for easy maven integration.You don’t have to worry about version mismatch.
You can quickly create using sample project using spring boot initializer

1. What are disadvantages of Spring boot?
   If you want to convert your old spring application to Spring boot application, it may not be straight forward and can be time consuming.

2. How can you override default properties in Spring boot Project?
   Spring boot provides a lot of properties which can be overridden by specifying them in application.properties.

For example: You want to specify prefix and suffix in Spring MVC applications. You can simply do it by putting below properties in application.properties.

spring.mvc.view.prefix: /WEB-INF/
spring.mvc.view.suffix: .jsp

1. How can you run Spring boot application on custom port? You can simply put server.port properties in application.properties.

For example:server.port=8050

1. What is Spring boot starter and how it is useful? Spring boot comes with a lot of starters which is set of convenient dependency descriptors which you can include in your pom.xml.

For example: Let’s say you want to work Spring MVC application, you can simply include “spring–boot–starter–web” as dependency in pom.xml .

1. Can we use Spring boot with applications which are not using Spring?
   No, it is not possible as of now. Spring boot is limited to Spring applications only.

2. What is name of the configuration file which you use in Spring boot?
   Configuration file used in Spring boot projects is application.properties. It is very important file as it is used to override all default configurations.

3. What is DevTools in Spring boot?
   Spring boot comes with DevTools which is introduced to increase the productivity of developer. You don’t need to redeploy your application every time you make the changes.Developer can simply reload the changes without restart of the server. It avoids pain of redeploying application every time when you make any change. This module will be disabled in production environment.

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