spring boot interview questions

Frequently Searched 10 Spring Boot Interview Questions & Answers

The learning process is, of course, the most valuable aspect of any certification, and this is also true for Spring Boot certifications. Yes, earning a certification as a Spring Developer is worthwhile since you’ll master the technology in-depth, get credibility, and be better prepared for interviews.

You’ve arrived at the correct site if you’re going on a job interview and need a list of spring boot interview questions and answers. This blog contains a list of spring boot interview questions and responses for both experienced and novice candidates, which will undoubtedly help you land your ideal position. Let’s begin.

10 Spring Boot Interview Questions

1. What are the advantages of spring boots?

  • The combination of the compact Spring application framework, configuration annotations, and the integrated HTTP server is known as Spring Boot.
  • The time required for Integration Test, Development, and Unit Testing is decreased by Spring Boot, which is made available with an auto-configuration feature, and support for Spring Initializer, Groovy, and Java.
  • It offers customers a full setup and programming paradigm for Java corporate applications, assisting in the construction of quick, responsive, and secure online applications.
  • A quicker method of developing RESTful or REST architecture-based web services is provided by Spring Boot, which makes use of the fundamental components of the Spring application framework.

2. What distinguishes Spring Boot from JAX-RS?

The foundation of JAX-RS is the provision of a collection of Java Annotations and their application to basic Java objects. Indeed, the annotations aid in our ability to abstract away the specifics of the client-server interactions at a basic level. It provides annotations to handle HTTP requests and replies and binds them in the code to make their implementations simpler. Since JAX-RS is merely a specification, it cannot be utilized without a compliant implementation.

However, Spring MVC is a full-featured framework with REST support. It offers us helpful annotations to abstract from low-level features, just like JAX-RS does. Being a part of the Spring Framework ecosystem is its key benefit. As a result, we can utilize dependency injection just as we would with any other Spring module. Additionally, it is simple to interface with other parts like Spring Security, Spring Data REST, and Spring AOP.

3. What aspects of Spring Boot facilitate the creation of Microservices Applications?

Spring Boot provides the following essential functionalities for customizing, creating, and deploying microservices architecture. It is mostly used for creating microservices-based applications.

  • Incorporates an application management and monitoring tool called the Actuator
  • Offers assistance for embedded servers like Jetty and Tomcat
  • Users don’t need to deploy war files; they can just execute them.
  • Consists of an auto-configuration feature that enables users to set up Spring apps instantly.
  • Feign HTTP client is supported.

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4. Why is Spring Boot chosen the above alternative frameworks?

The fact that Spring Boot provides a large number of libraries in its Spring cloud is one of the key factors in why most developers like the Java-based Spring. Additionally, Spring Boot provides strong support for Docker containerization and improved interoperability with Spring frameworks, enhancing efficiency and usability.

The following are some of the strongest arguments in favor –

  • The most effective method for configuring Java beans
  • Provides reliable batch processing
  • Facilitates the efficient management of REST endpoints by users.
  • By including an auto-configuration tool, the human configuration is no longer necessary.
  • Enables settings based on annotations
  • Manage dependencies with ease
  • Includes integrated servlet containers

5. What are Spring Boot’s main dependencies?

Important Spring Boot dependencies that must be introduced to a Gradle- or Maven-based application for it to be compatible with Spring Boot capabilities are listed below.

  1. spring-boot-starter-parent
  2. spring-boot-maven-plugin
  3. spring-boot-starter-test
  4. spring-boot-starter-security
  5. spring-boot-starter-actuator
  6. Spring-boot-starter-web

6. How are Interceptors created? What annotations are used?

Interceptor, a key Spring Boot feature, implements the interface Handler Interceptor and utilizes the annotated class @Component.

The three primary techniques on the interface are:

Before the handler is put into place, the request is intercepted using the preHandle() method. Developers can carry on with handler execution if preHandle() returns a “true” boolean value. Developers should halt the handler execution if preHandle() returns a “false” boolean result.

7. A Swagger in a Spring Boot: What is it?

Swagger is used to concisely describe and document RESTful APIs in a machine-readable and human-readable style that is simple to understand for testers, developers, and those without much programming experience.

Swagger enables hassle-free application development, integration, and discovery, enabling API users to communicate with distant services using the least amount of implementation logic possible.

8. What do Spring Boot profiles do?

Users can map components and beans to certain profiles, such as the Development (dev), Production (prod), or Test profiles, using the Spring framework’s profiles.

Components and beans in Spring are mapped to a specific profile using the annotation @Profile.

Using SpringApplication, for example, developers can also create profiles.

9. What distinguishes Hibernate from Spring Data JPA?

With the aid of Hibernate, a Java Persistence API (JPA) implementation, users may save, retrieve, map, and update application data to and from Java objects and relational databases. Hibernate frees developers from writing SQL scripts for data persistence by mapping Java data types to SQL (Structured Query Language) data types and Java classes to database tables.

On the other side, Spring Data JPA, a sub-project of Spring Data, applies JPA and Object-Relational Mapping implementations like Hibernate to provide an abstraction over the DAL (Data Access Layer). The seamless installation of JPA repositories is made possible by Spring Data JPA, which also aims to significantly enhance DAL’s overall implementation.

10. What distinguishes the @RestController and @Controller Annotations?

A class that is annotated with the conventional Spring @Controller annotation is said to be a controller. It is essentially a @Component specialization that is discovered automatically by classpath scanning. The annotated handler techniques based on @RequestMapping annotations are used in conjunction with the @Controller annotation.

When creating RESTful web services, programmers utilize the @RestController annotation and the Spring Model-View-Controller framework (MVC). The Spring @RestController assigns the requested handler methods to the request data. The @RestController converts the response body to an XML or JSON response once the handler method has generated it.

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