🚫 A problem occurred configuring root project 'hello-spring'.
Could not resolve all files for configuration ':classpath'.
Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.0.2.
Required by:
project : > org.springframework.boot:org.springframework.boot.gradle.plugin:3.0.2
No matching variant of org.springframework.boot:spring-boot-gradle-plugin:3.0.2 was found. The consumer was configured to find a runtime of a library compatible with Java 11, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '7.6' but:
...

원인

JAVA는 8 버전인데, Spring boot 버전은 3.x로 설치해서 발생한 에러이다.
Spring boot 3.x 버전은 JAVA 17 버전부터 지원한다.

해결 방법

방법 1. JAVA를 17 버전으로 업데이트 한다.
방법 2. Spring boot를 2.x 버전으로 선택하여 프로젝트를 생성한다.