Aim To Excel: Spring Boot Interview Questions and Answers In 2023
Java is one of the finest offerings in the software industry. According to Oracle, the company that owns Java, Java runs on 3 billion devices worldwide. Many server-side applications are written in Java which processes tens of millions of requests per day. One of the most impressive things about this coding language is the impressive set of frameworks, especially the comprehensive ones like Spring Boot.
The framework comes bearing multiple features – it is easy yet enables the effective creation of stand-alone spring applications. It allows the embedding of Tomcat, Jetty, or Undertow directly. It also configures Spring and third-party libraries automatically and provides metrics, health checks, and externalized configuration. The best part about this framework is that no code generation / no XML configuration is required.
Owing to these promising features and the rising popularity of the framework, many organizations look to leverage it. As such, they look for developers who have in-depth knowledge of Spring Boot. If you are a developer who aspires to kick-start your career in Java, here are some of the Spring Boot framework Interview Questions and Answers that can help you grab all the right opportunities in the industry.
10 Spring Boot Interview Questions & Answers For Freshers
What is Spring Boot and mention the need for it?
Spring Boot is an open-source Java-based framework. It makes the process of creating microservices with Spring Framework faster and easier. It is developed by the Pivotal Team and has the impressive ability to create standalone applications. The primary objective of this framework is to reduce overall development time. It also helps increase efficiency by providing a default setup for unit and integration tests.
Mention a few features of Spring Boot.
A few important features of Spring Boot are as follows:
Auto-Configuration, Starter Dependency, Logging and Security, Spring CLI, Spring Initializer, and Spring Actuator.
What is Spring Actuator?
Spring Actuator is a cool feature of Spring Boot with the help of which you can see what is happening inside a running application.
What is Spring Boot CLI?
Spring Boot CLI is a tool supported by the official Spring Framework. It allows you to use Groovy for writing Spring boot applications and avoids boilerplate code.
What are its advantages?
The advantages of Spring Boot are as follows:
- Creates stand-alone applications with a range of non-functional features
- Provides auto-configuration to load a set of default configurations for a quick start of the application
- Integrates with Spring Ecosystem like Spring JDBC, Spring ORM, and Spring Data
- Comes with starters to ensure dependency management and also provides various security metrics
- Consists of a wide range of APIs for monitoring and managing applications in dev and prod.
What is Spring Boot dependency management?
Spring Boot dependency management is used to manage dependencies and configuration automatically without you specifying the version for any of those dependencies.
What is the need for Spring Boot DevTools?
Spring Boot DevTools is an elaborated set of tools and aims to make the process of developing an application easier. If the application runs in production, then this module is automatically disabled, repackaging of archives is also excluded by default. So, the Spring Boot Developer Tools applies properties to the respective development environments.
How to enable HTTP/2 support in Spring Boot?
You can enable the HTTP/2 support in Spring Boot by: server.http2.enabled=true
Explain Spring Data.
Spring Data aims to make it easy for developers to use relational and non-relational databases, cloud-based data services, and other data access technologies. It essentially makes it easy for data access and still retains the underlying data.
What is auto-configuration in Spring Boot?
Auto-configuration is used to automatically configure the required configuration for the application. For example, if you have a data source bean present in the classpath of the application, then it automatically configures the JDBC template. With the help of auto-configuration, you can create a Java application easily, as it automatically configures the required beans, controllers, etc.
10 Spring Boot Interview Questions & Answers For Experienced Developers
How to disable the auto-configuration?
To disable the auto-configuration property, you have to exclude the attribute of @EnableAutoConfiguration, in the scenario where you do not want it to be applied.
What is the best way to expose custom application configuration with Spring Boot?
One way to expose the custom application configuration in Spring Boot is by using the @Value annotation. But, the only problem with this annotation is that all the configuration values will be distributed throughout the application. Instead, you can use a centralized approach. You can define a configuration component using the @ConfigurationProperties
Can we create a non-web application in Spring Boot?
Yes, we can create a non-web application by removing the web dependencies from the classpath along with changing the way Spring Boot creates the application context.
What is Spring Data REST?
Spring Data REST is used to expose the RESTful resources around Spring Data repositories.
In which layer, should the boundary of a transaction start?
The boundary of the transaction should start from the Service Layer since the logic for the business transaction is present in this layer itself.
How to register a custom auto-configuration?
To register an auto-configuration class, you have to mention the fully-qualified name under the @EnableAutoConfiguration key META-INF/spring. factories file. Also, if we build the with maven, then this file should be placed in the resources/META-INT directory.
What is the importance of Profiles?
Profiles are used to provide a way to segregate the different parts of the application configuration and make it available for various environments. Any @Component or a @Configuration can be marked with a @Profile to limit as it is loaded.
What are the steps to add a custom JS code with Spring Boot?
The steps to add a custom JS code with Spring Boot are as follows:
-Now, create a folder and name it static under the resources folder
-In this folder, you can put the static content in that folder
Why is Spring Data REST not recommended in real-world applications?
Spring Data REST can be leveraged for the initial evolution of the project. It is not recommended in real-world applications as you are exposing your database entities directly as REST Services. While designing RESTful services, the two most important things that we consider are the domain model and the consumers. But, while using Spring Data REST, none of these parameters are considered. The entities are directly exposed.
What does it mean when we say Spring Boot supports relaxed binding?
Relaxed binding is a way that the property name does not need to match the key of the environment property. In Spring Boot, the relaxed binding applies to the type-safe binding of the configuration properties.
Related Readings:
- Java Interview Questions and Answers.
- Django Vs. Springboot.
- Java Development Tools Every Developer Should Know.
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