Auto-build

• Preferences → Build, Execute, Deployment → Compiler → [x] Build project automatically

• Command + Shift + A (on MacOS) → Type "Registry" → [x] compiler.automake.allow.when.app.running

• Add dependency to pom.xml

  <dependency>
  	<groupId>org.springframework.boot</groupId>
  	<artifactId>spring-boot-devtools</artifactId>
  	<version>2.5.0</version>
  	<optional>true</optional>
  </dependency>