Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.0.1.
Spring - JDK 간 버전 호환
Spring Framework 5.3.x with JDK 8 - 19 (expected)
Spring Framework 5.2.x with JDK 8 - 15
Spring Framework 5.1.x with JDK 8 - 12
Spring Framework 5.0.x with JDK 8 - 10
Spring Framework 4.3.x with JDK 6 - 8 (its official EOL(end-of-life))
Spring Boot - JDK 간 버전 호환
Spring Boot 2.3↑ with Java 9 and above
Spring Boot 2.1↓ with Java 8 - 11