[Spring] Could not resolve all files for configuration ':classpath'. 해결 방법

Spring

[Spring] Could not resolve all files for configuration ':classpath'. 해결 방법

feelcoding 2023. 3. 20. 06:07

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안녕하세요

일단 저는 Java 17이 나온 이후로는 Java 버전을 17로 설정하여 프로젝트를 만들고 있습니다. (LTS 버전이기도 하고 Java 17의 stream 메소드 toList()가 너무 편리하더라고요?ㅎㅎ collect(Collectors.toList()) 안 쓰고 저거 쓰니까 아주 신세계...👍)

그런데 매번 오류가 났습니다. 왜냐하면 제 컴퓨터에는 JDK 11이 기본으로 설정되어 있거든요.. (환경변수 설정만 바꿔주면 되는데 말이죠...... 그게 귀찮아서.........)

그래서 저는 당연히

'프로젝트를 생성할 때 Java 버전을 17로 만들었는데 내 컴퓨터의 default JDK 버전이 11이니까 당연히 JDK 17이 없다고 오류가 나겠지'

하면서 항상 인텔리제이의 Settings에 들어가서 JDK 17로 바꿔주고 실행을 했었습니다.

그런데 얼마 전 블로그를 작성하다가, 예제 코드를 깃허브에 올려두려고 프로젝트를 다시 만들었습니다.

제 블로그를 읽으시는 분들이 JDK 17이 설치가 안 되어 있을 수도 있으니 Java 11로 만들어야겠다! 하고 Spring Boot 3.0.4, Java 11로 프로젝트를 만들었습니다.

그런데 여전히 똑같은 오류가 나는 것입니다!!!

아니 Java 11로 프로젝트를 만들었고 내 컴퓨터에 설치된 JDK도 11 버전인데 왜 오류가 나는거지??

검색을 해보니 Spring Boot 3.0부터는 Java 17 이상만 지원한다고 합니다.

이 사실을 몰랐을 때부터 매번 무심코 해줬던 설정인데,

Spring Boot 3.0 이상부터는 Java 17부터만 된다는 사실을 알게 된 기념(?)으로

같은 문제로 어려움을 겪고 계신 분들께 조금이나마 도움이 되기를 바라며 제가 해결한 방법을 공유하고자 합니다.

✅ 실행 환경

일단 저의 환경을 공유해드리자면 시스템의 환경변수로 등록되어 있는 것은 JDK 11입니다.

하지만 제 컴퓨터에는 JDK 8, JDK 11, JDK 17이 설치되어 있습니다.

스프링 부트 버전은 3.0.4입니다.

✅ 문제

스프링 부트 3.0 이상의 프로젝트를 열었더니 이런 오류가 발생합니다.

A problem occurred configuring root project '프로젝트명'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.0.4.
     Required by:
         project : > org.springframework.boot:org.springframework.boot.gradle.plugin:3.0.4
      > No matching variant of org.springframework.boot:spring-boot-gradle-plugin:3.0.4 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 '7.6.1' but:
          - Variant 'apiElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.4 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 '7.6.1')
          - Variant 'javadocElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.4 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 '7.6.1')
          - Variant 'mavenOptionalApiElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.4 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 '7.6.1')
          - Variant 'mavenOptionalRuntimeElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.4 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 '7.6.1')
          - Variant 'runtimeElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.4 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 '7.6.1')
          - Variant 'sourcesElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.4 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 '7.6.1')

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