[Spring] Spring Boot 3.X 와 Java 버전

개인 공부를 하면서 Spring Boot 프로젝트를 새로 생성할 일이 생겨 생성할 때 익숙하게 선택하던 Java 11로 생성했는데 실행이 안됐다.
결론 - Spring Boot 3.0 부터는 Java 17 이상을 사용해야 한다.

오류

Caused by: org.gradle.internal.component.NoMatchingConfigurationSelectionException: 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:
  - Variant 'apiElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.2 declares a library, packaged as a jar, and its dependencies declared externally:
      - Incompatible because this component declares an API of a component compatible with Java 17 and the consumer needed a runtime of a component compatible with Java 11
      - Other compatible attribute:
          - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
  - Variant 'javadocElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.2 declares a runtime of a component, and its dependencies declared externally:
      - Incompatible because this component declares documentation and the consumer needed a library
      - Other compatible attributes:
          - Doesn't say anything about its target Java version (required compatibility with Java 11)
          - Doesn't say anything about its elements (required them packaged as a jar)
          - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
  - Variant 'mavenOptionalApiElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.2 declares a library, packaged as a jar, and its dependencies declared externally:
      - Incompatible because this component declares an API of a component compatible with Java 17 and the consumer needed a runtime of a component compatible with Java 11
      - Other compatible attribute:
          - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
  - Variant 'mavenOptionalRuntimeElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.2 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
      - Incompatible because this component declares a component compatible with Java 17 and the consumer needed a component compatible with Java 11
      - Other compatible attribute:
          - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
  - Variant 'runtimeElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.2 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
      - Incompatible because this component declares a component compatible with Java 17 and the consumer needed a component compatible with Java 11
      - Other compatible attribute:
          - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
  - Variant 'sourcesElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.2 declares a runtime of a component, and its dependencies declared externally:
      - Incompatible because this component declares documentation and the consumer needed a library
      - Other compatible attributes:
          - Doesn't say anything about its target Java version (required compatibility with Java 11)
          - Doesn't say anything about its elements (required them packaged as a jar)
          - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')

해결

1. Java 17 버전 이상 설치
2. build.gradle 자바 버전 17이상으로 설정