Interview Questions and Answers

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.

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

In order to run a Spring Boot application, you require to put server.port property in application.properties. 

No, it is not possible as Spring Boot is limited to Spring application only.

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.

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.

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.

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

In order to enable debug logging, you can specify --debug while starting the application from the command prompt.

Spring Boot has lots of properties that can be easily overridden by specifying them in application.properties.

A class without any package declaration is considered as a default package.

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.

Spring Boot supports spring-boot-starter-data-jpa, which helps you to connect spring application with a relational database.

The main difference between both of them is that JPA is a specification/Interface, whereas Hibernate is only JPA implementations.

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.

@PathVariable annotation helps you to extract information from the URI directly.

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.

It is a special starter which makes Gradle or Maven dependency-management easy by adding jars to your classpath.

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.

Spring Boot admin is a community project which helps you to manage and monitor your Spring Boot applications.

Spring CLI is used for writing in Groovy Spring Boot application, which helps you to concise code.

Thymelaf is a server-side Java template engine for a web application. It helps you to bring elegant natural templates to your web application.

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.

Yes, we can disable the default web server by using application.properties to configure the web application type.

Profiles are used to separate various parts of your spring application configuration and make it only available in certain environments.

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.

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.

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.

Spring Boot provides a very useful way to handle exceptions using @ControllerAdvice annotation.

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.

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.