Spring Boot Interview Questions and Answers in 2025 (100+ Q&A)

Spring Boot

Ques:- What is Spring Boot DevTools and how is it used for development

Asked In :- Chella Software, EvolveWare, Solverminds Solutions Technologies, people tech group inc,

Right Answer:
Spring Boot DevTools is a module that provides additional development features to enhance the development experience in Spring Boot applications. It enables automatic restarts, live reload of the application when files change, and improved debugging capabilities. To use it, you simply add the DevTools dependency to your project, and it automatically configures itself to improve productivity during development.

Spring Boot

Ques:- How do you handle properties and configuration in Spring Boot

Asked In :- Oakland Systems, Tismo Technology Solutions, tatvasoft, plintron, edvenswa tech,

Right Answer:
In Spring Boot, properties and configuration are handled using the `application.properties` or `application.yml` files located in the `src/main/resources` directory. You can define key-value pairs for configuration settings in these files. Additionally, you can use the `@Value` annotation to inject property values into your beans, or use the `@ConfigurationProperties` annotation to bind a group of properties to a Java object. Spring Boot also supports external configuration files and environment variables for flexibility.

Spring Boot

Ques:- What is Spring Boot embedded Tomcat server and how is it different from a traditional server

Asked In :- Pennant Technologies, plintron,

Right Answer:
Spring Boot embedded Tomcat server is a built-in web server that comes packaged with a Spring Boot application, allowing it to run independently without needing an external server installation. The main difference from a traditional server is that with embedded Tomcat, the application is self-contained, simplifying deployment and configuration, while a traditional server requires separate installation and management of the server environment.

Spring Boot

Ques:- What are Spring Boot profiles and how do they work

Asked In :- Chella Software, EvolveWare, Propel Technology, pine labs, pragma edge inc, appfire,

Right Answer:
Spring Boot profiles are a way to segregate parts of your application configuration and make it available only in certain environments. They allow you to define different settings for development, testing, and production environments. You can activate a profile by using the `spring.profiles.active` property in your application properties or YAML file, or by passing it as a command-line argument. Each profile can have its own configuration files (e.g., `application-dev.properties`, `application-prod.properties`), and Spring Boot will load the appropriate configuration based on the active profile.

Spring Boot

Ques:- How do you handle error handling and exception management in Spring Boot

Asked In :- Angular Minds, Oakland Systems, Tismo Technology Solutions, kgisl, optiva inc.,

Right Answer:
In Spring Boot, you can handle error handling and exception management using the following methods:

1. **@ControllerAdvice**: Create a class annotated with `@ControllerAdvice` to handle exceptions globally across all controllers. Use `@ExceptionHandler` methods to define how to respond to specific exceptions.

2. **@ResponseStatus**: Annotate your custom exception classes with `@ResponseStatus` to return specific HTTP status codes.

3. **ErrorController**: Implement the `ErrorController` interface to customize the error response for specific error pages.

4. **@RestControllerAdvice**: Similar to `@ControllerAdvice`, but specifically for REST APIs, allowing you to return JSON responses for exceptions.

5. **Application Properties**: Configure error handling properties in `application.properties` or `application.yml` to customize error messages and responses.

By using these techniques, you can effectively manage exceptions and provide meaningful error responses in your Spring Boot application.

Spring Boot

Ques:- What is the role of Spring Boot in building RESTful web services

Asked In :- Chella Software, EvolveWare, pragma edge inc, appfire,

Right Answer:
Spring Boot simplifies the process of building RESTful web services by providing a set of conventions and tools that streamline configuration, reduce boilerplate code, and enable easy integration with various components like databases and security. It includes features such as embedded servers, automatic configuration, and built-in support for JSON, making it easier to create, test, and deploy REST APIs quickly.

Spring Boot

Ques:- What is Spring Boot and how does it simplify Java development

Asked In :- Velocity Software Solutions, EdgeVerve Systems, Codingmart Technologies, Solverminds Solutions Technologies, revature, 4w technologies, pragma edge inc,

Right Answer:
Spring Boot is an extension of the Spring framework that simplifies the setup and development of new Spring applications. It provides a range of features, including auto-configuration, embedded servers, and production-ready metrics, which reduce the need for extensive configuration and boilerplate code, allowing developers to focus on building applications quickly and efficiently.

Spring Boot

Ques:- How do you implement security in Spring Boot using Spring Security

Asked In :- Webtech Developers, Java R&D, people tech group inc, revature, pranion technology ventures private limited,

Right Answer:
To implement security in Spring Boot using Spring Security, follow these steps:

1. **Add Dependencies**: Include the Spring Security dependency in your `pom.xml` or `build.gradle` file.

For Maven:
```xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
```

2. **Create a Security Configuration Class**: Extend `WebSecurityConfigurerAdapter` and override the `configure` methods to set up authentication and authorization.

```java
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http)

Spring Boot

Ques:- What is the difference between Spring Framework and Spring Boot

Asked In :- EdgeVerve Systems, Relinns Technologies, Mozilor Technologies, pine labs,

Right Answer:
Spring Framework is a comprehensive framework for building Java applications, providing features like dependency injection, aspect-oriented programming, and transaction management. Spring Boot, on the other hand, is a tool built on top of the Spring Framework that simplifies the setup and development of new Spring applications by providing default configurations, embedded servers, and a convention-over-configuration approach.

Spring Boot

Ques:- What are Spring Boot testing capabilities and how do you perform unit and integration tests

Asked In :- C E I India, Mozilor Technologies, 4w technologies, pragma edge inc,

Right Answer:
Spring Boot provides several testing capabilities, including support for unit tests and integration tests.

For unit testing, you can use JUnit and Mockito to test individual components in isolation. You typically annotate your test classes with `@SpringBootTest` for integration tests or `@WebMvcTest` for controller tests, and use `@MockBean` to mock dependencies.

For integration testing, you can use `@SpringBootTest` to load the full application context and test the application as a whole. You can also use `@TestRestTemplate` or `MockMvc` to simulate HTTP requests and validate responses.

In summary:
- Use JUnit and Mockito for unit tests.
- Use `@SpringBootTest` for integration tests.
- Use `@MockBean` for mocking dependencies.
- Use `@TestRestTemplate` or `MockMvc` for testing web layers.

Spring Boot

Ques:- What are the main features of Spring Boot

Asked In :- T P F Software,

Right Answer:
The main features of Spring Boot are:

1. **Auto-Configuration**: Automatically configures Spring applications based on the dependencies present.
2. **Standalone**: Creates stand-alone applications with embedded servers like Tomcat or Jetty.
3. **Production-Ready**: Includes features like health checks and metrics for production environments.
4. **Convention over Configuration**: Reduces the need for extensive configuration by following sensible defaults.
5. **Spring Boot Starter**: Provides a set of convenient dependency descriptors for common tasks.
6. **Spring Boot CLI**: Allows running and testing Spring applications from the command line.
7. **Externalized Configuration**: Supports configuration through properties files, YAML files, environment variables, etc.
8. **Actuator**: Provides built-in endpoints for monitoring and managing applications.

Spring Boot

Ques:- How do you create a database connection in Spring Boot

Asked In :- optiva inc.,

Right Answer:
To create a database connection in Spring Boot, you need to:

1. Add the appropriate database dependency in your `pom.xml` (for Maven) or `build.gradle` (for Gradle).
2. Configure the database connection properties in the `application.properties` or `application.yml` file, specifying the URL, username, password, and driver class name. For example:

```properties
spring.datasource.url=jdbc:mysql://localhost:3306/yourdbname
spring.datasource.username=yourusername
spring.datasource.password=yourpassword
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
```

3. Optionally, you can use Spring Data JPA by adding the `spring-boot-starter-data-jpa` dependency and configuring JPA properties as needed.

Spring Boot

Ques:- What is the purpose of the @SpringBootApplication annotation in Spring Boot

Asked In :- Java R&D,

Right Answer:
The `@SpringBootApplication` annotation is a convenience annotation that combines three annotations: `@Configuration`, `@EnableAutoConfiguration`, and `@ComponentScan`. It indicates that the class is the main entry point for a Spring Boot application, enabling auto-configuration and component scanning in the specified package.

Spring Boot

Ques:- What is Spring Boot’s support for microservices architecture

Asked In :- Velocity Software Solutions, TalentServ Consulting, Oakland Systems, worldline global, appfire, pranion technology ventures private limited,

Right Answer:
Spring Boot supports microservices architecture by providing a lightweight framework that simplifies the development of standalone, production-ready applications. It offers features like embedded servers, auto-configuration, and easy integration with cloud services, which facilitate the creation, deployment, and management of microservices. Additionally, Spring Boot's support for RESTful APIs, configuration management, and service discovery enhances the scalability and maintainability of microservices.

Spring Boot

Ques:- How do you configure a Spring Boot application

Asked In :- Velocity Software Solutions, Angular Minds, TalentServ Consulting, Thinkitive Technologies, tatvasoft, pinnacle infotech, optiva inc., appfire,

Right Answer:
To configure a Spring Boot application, you typically use the `application.properties` or `application.yml` file to set various properties. You can also use Java configuration classes annotated with `@Configuration` and `@Bean` to define beans and customize settings programmatically. Additionally, you can use environment variables or command-line arguments to override configurations.

Spring Boot

Ques:- What is auto-configuration in Spring Boot and how does it work

Asked In :- Webtech Developers, Solverminds Solutions Technologies, 4w technologies,

Right Answer:
Auto-configuration in Spring Boot is a feature that automatically configures your Spring application based on the dependencies present in the classpath. It uses conditional configuration to set up beans and settings without requiring explicit configuration from the developer. This is achieved through the `@EnableAutoConfiguration` annotation, which triggers the auto-configuration process, and Spring Boot’s predefined configuration classes that check for specific classes and properties to determine what to configure.

Spring Boot

Ques:- What are Spring Boot starters and how do they help in development

Asked In :- C E I India, Chella Software, Propel Technology, Solverminds Solutions Technologies, 4w technologies, edvenswa tech,

Right Answer:
Spring Boot starters are a set of convenient dependency descriptors that simplify the setup of Spring applications. They provide a collection of pre-configured libraries and dependencies for common tasks, allowing developers to quickly add functionality to their projects without needing to specify each dependency individually. This helps streamline development and reduces configuration time.

Spring Boot

Ques:- What is Spring Boot Actuator and what functionality does it provide

Asked In :- Angular Minds, Codingmart Technologies, Thinkitive Technologies, Solverminds Solutions Technologies, kgisl, people tech group inc, revature, palle technologies,

Right Answer:
Spring Boot Actuator is a module in Spring Boot that provides production-ready features to help monitor and manage applications. It offers functionalities such as health checks, metrics, application environment information, and endpoints for managing application settings and configurations.

Spring Boot

Ques:- What is the role of Spring Boot CLI

Asked In :- palle technologies,

Right Answer:
Spring Boot CLI (Command Line Interface) is a tool that allows developers to quickly create, run, and manage Spring Boot applications from the command line using Groovy scripts. It simplifies the development process by providing a way to easily set up and test Spring applications without needing to configure a full project structure.

Spring Boot

Ques:- How do you run a Spring Boot application

Asked In :- Pennant Technologies, kgisl, pinnacle infotech, palle technologies, pranion technology ventures private limited,

Right Answer:
You can run a Spring Boot application by executing the main method in the main class annotated with `@SpringBootApplication`, or by using the command `mvn spring-boot:run` if you are using Maven, or `./gradlew bootRun` if you are using Gradle. Additionally, you can run the packaged JAR file using the command `java -jar your-application.jar`.

Spring Boot is an open-source, Java-based framework that is built on top of the Spring Framework, designed to simplify the process of creating production-grade, stand-alone applications. While the traditional Spring Framework provides a comprehensive and flexible platform for building Java applications, it often required a significant amount of configuration and setup. Spring Boot addresses this complexity by introducing an “opinionated” approach, which prioritizes convention over configuration to enable rapid application development.

The core philosophy of Spring Boot is to get a developer up and running with a robust application in the shortest time possible. It achieves this through several key features:

Auto-Configuration: This is perhaps the most significant feature of Spring Boot. It automatically configures a Spring application based on the dependencies present on the classpath. For instance, if you add the spring-boot-starter-web dependency, Spring Boot will automatically configure a Tomcat server and a Spring MVC dispatcher servlet, allowing you to start building web endpoints immediately without manual configuration. This drastically reduces the boilerplate code that developers need to write.
Starter Dependencies: Spring Boot provides a set of “starter” dependencies that are pre-packaged collections of related libraries. Each starter is designed to get you started with a specific type of functionality, such as web development, database connectivity, or security. By including a single starter dependency in your project’s build file (e.g., Maven or Gradle), you get all the necessary libraries and transitive dependencies, which simplifies dependency management.
Embedded Servers: Spring Boot applications come with an embedded web server (like Tomcat, Jetty, or Undertow) right out of the box. This means you can create a single, executable JAR file that can be run directly from the command line, eliminating the need to deploy your application to a separate server container. This simplifies the deployment process and makes it easier to create microservices.
Actuator: For production-ready applications, Spring Boot Actuator provides a suite of features for monitoring and managing your application. It exposes endpoints that provide valuable information about the application’s health, metrics, environment properties, and more, which is crucial for troubleshooting and operational management.

In summary, Spring Boot is not a replacement for the Spring Framework but a powerful extension that streamlines development. It simplifies the setup and configuration of a Spring application, allowing developers to focus on writing business logic rather than spending time on tedious configuration. Its conventions and tools make it an ideal choice for building microservices, REST APIs, and other scalable, maintainable Java applications.

Questions in: Spring Boot

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