Question 1

What is Spring Boot DevTools?

Accepted Answer

Spring Boot DevTools is a development module that enhances developer experience with features like automatic restart (auto-restart on code changes), LiveReload (automatic browser refresh), and remote debugging. DevTools is automatically disabled in production (detected via JAR/WAR packaging) to avoid performance impact. This optional dependency significantly accelerates the development cycle by reducing manual restarts.

Question 2

Which DevTools feature allows automatic browser refresh?

Accepted Answer

LiveReload is an embedded server that listens on port 35729 and triggers automatic browser refresh whenever a resource (HTML, CSS, JS, images) is modified in the classpath. Unlike automatic restart which restarts the Spring context, LiveReload focuses on front-end assets for immediate visual feedback. A LiveReload browser extension must be installed to establish the WebSocket connection with the DevTools server.

Question 3

How to add Spring Boot DevTools to a Maven project?

Accepted Answer

DevTools is added as a Maven dependency with optional scope and true in the configuration. The optional scope ensures DevTools won't be transitive to projects depending on yours, while true allows excluding DevTools during production packaging (spring-boot-maven-plugin with excludeDevtools). This double protection ensures DevTools stays strictly in the development environment. The optional scope is the best practice for development-only dependencies.

Spring Boot DevTools

What is Spring Boot DevTools?

คำตอบ

Which DevTools feature allows automatic browser refresh?

คำตอบ

How to add Spring Boot DevTools to a Maven project?

คำตอบ

What is the behavior of DevTools in production?

What is the main advantage of DevTools automatic restart?

หัวข้อสัมภาษณ์ Spring Boot อื่นๆ

Spring Core - IoC & DI

Spring Boot Auto-Configuration

Spring Boot Starters

Application Properties & YAML

Logging with SLF4J & Logback

Spring MVC Basics

Spring REST Controllers

Request & Response Handling

Exception Handling

Bean Validation

Spring Data JPA Basics

JPA Entities & Relationships

JPA Queries

Spring Data Repositories

Spring Security Basics

Spring Boot Actuator

Unit Testing with JUnit & Mockito

Spring Boot Testing

Profiles & Environment

RestTemplate & WebClient

Async & Scheduling

Caching with Spring

Spring WebFlux (Reactive)

Spring Transactions

Advanced Authentication & Authorization

JWT & Stateless Security

OAuth2 & Authorization Server

Spring Boot & Docker

Microservices with Spring

Spring Cloud Config

Performance Optimization

GraalVM Native Images

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