Spring Boot - Level I

Practice 55 Spring Boot - Level I interview questions with detailed answers. Part of the Spring Boot track on Java Interview Hub.

• What is Spring Boot?
• What are the Features of Spring Boot?
• What are the advantages of using Spring Boot?
• Define the Key Components of Spring Boot.
• Why do we prefer Spring Boot over Spring?
• Explain the internal working of Spring Boot.
• What are the Spring Boot Starter Dependencies?
• How does a Spring application get started?
• What does the @SpringBootApplication annotation do internally?
• What is Spring Initializr?
• What is a Spring Bean?
• What is Auto-wiring?
• What is ApplicationRunner in SpringBoot?
• What is CommandLineRunner in SpringBoot?
• What is Spring Boot CLI and the most used CLI commands?
• What is Spring Boot dependency management?
• Is it possible to change the port of the embedded Tomcat server in Spring Boot?
• What happens if a starter dependency includes conflicting versions of libraries with other dependencies in the project?
• What is the default port of Tomcat in Spring Boot?
• Can we disable the default web server in a Spring Boot application?
• How to disable a specific auto-configuration class?
• Describe the flow of HTTPS requests through a Spring Boot application.
• Explain @RestController annotation in Spring Boot.
• Difference between @Controller and @RestController
• What is the difference between RequestMapping and GetMapping?
• What are the differences between @SpringBootApplication and @EnableAutoConfiguration annotation?
• How can you programmatically determine which profiles are currently active in a Spring Boot application?
• Mention the differences between WAR and embedded containers.
• What is Spring Boot Actuator?
• How to enable Actuator in Spring Boot?
• How to get the list of all the beans in our Spring Boot application?
• Can we check the environment properties in our Spring Boot application? Explain how.
• How to enable debugging log in the Spring Boot application?
• Explain the need of dev-tools dependency.
• How do you test a Spring Boot application?
• What is the purpose of unit testing in software development?
• How do JUnit and Mockito facilitate unit testing in Java projects?
• Explain the difference between @Mock and @InjectMocks in Mockito.?
• What is the role of @SpringBootTest annotation?
• How do you handle exceptions in Spring Boot applications?
• Explain the purpose of the pom.xml file in a Maven project.
• How auto configuration play an important role in springboot application?
• Can we customize a specific auto-configuration in springboot?
• How can you disable specific auto-configuration classes in Spring Boot?
• How do starters simplify the Maven or Gradle configuration?
• How do you create REST APIs?
• What is versioning in REST? What are the ways that we can use to implement versioning?
• What are the REST API Best practices ?
• What are the uses of ResponseEntity?
• What should the delete API method status code be?
• What is swagger?
• How does Swagger help in documenting APIs?
• What all servers are provided by springboot and which one is default?
• How does Spring Boot decide which embedded server to use if multiple options are available in the classpath?
• How can we disable the default server and enable the different one?