1. dependency 추가
Maven
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency>
Gradle
dependencies { developmentOnly 'org.springframework.boot:spring-boot-devtools' }
2. application.properties 추가
spring.devtools.livereload.enabled=true spring.thymeleaf.cache=false
3. Intellij 환경설정 수정

Build project automatically 체크
4. Intellij Registry 수정


compiler.automake.allow.when.app.running 체크