Spring Boot - Level III (Scenario Based)

Practice 16 Spring Boot - Level III (Scenario Based) interview questions with detailed answers. Part of the Spring Boot track on Java Interview Hub.

• Imagine Your application requires data from an external REST API to function. Describe how you would use RestTemplate or WebClient to consume the REST API in your Spring Boot application.
• Your Spring Boot backend needs to accept cross-origin requests from a specific frontend domain. Explain how you would configure CORS policies in your application.
• Imagine you need to make a simple web application with Spring Boot that serves a static homepage and a dynamic page displaying current server time. Discuss the project structure you would use.
• Your application behaves differently in development and production environments. How would you use Spring profiles to manage these differences?
• What strategies would you use to optimize the performance of a Spring Boot application?
• Describe a scenario where a Spring Boot application needs to dynamically switch between multiple data sources at runtime based on the request context.
• Discuss how you would add a GraphQL API to an existing Spring Boot RESTful service.
• Describe how you would secure sensitive data in a Spring Boot application that is accessed by multiple users with different roles.
• In an IoT application scenario, explain how a Spring Boot backend could be designed to efficiently process and analyze real-time data streams from thousands of IoT devices.
• Discuss the specific security challenges associated with using WebSockets in a Spring Boot application.
• How would you implement efficient handling of large file uploads in a Spring Boot REST API, ensuring that the system remains responsive and scalable?
• How you would use Spring WebFlux to consume data from an external service in a non-blocking manner and process this data reactively within your Spring Boot application.
• Imagine you need to develop a REST API in a Spring Boot application that allows clients to manage user data. Explain how you would structure your application.
• Imagine you are designing a Spring Boot application that interfaces with multiple external APIs. How would you handle API rate limits and failures?
• You need to deploy a Spring Boot application to a cloud platform (e.g., AWS, Azure). What steps would you take, and how would you configure the application properties for different environments?
• Explain how you would use application events in Spring Boot to notify different parts of your application about significant activities.