[Error] Gradle, Spring Boot 3.x.x 실행 에러

스프링 부트 3.0.6으로 테스트 중인데, 3 버젼 부터는 java17 이상 지원된다.

 

java8을 2030년까지 지원하기로 되어있는데 오히려 11은 26년, 17은 29년 지원인 상태...

java8을 사용하는 프로젝트가 워낙 많아서 그런 것 같다.

 

어쨌든 20일 전에 나온 따끈따끈한 그래들 최신 버젼으로 높인 후, 빌드해보았는데

gradle -v

------------------------------------------------------------
Gradle 8.1.1
------------------------------------------------------------

Build time:   2023-04-21 12:31:26 UTC
Revision:     1cf537a851c635c364a4214885f8b9798051175b

Kotlin:       1.8.10
Groovy:       3.0.15
Ant:          Apache Ant(TM) version 1.10.11 compiled on July 10 2021
JVM:          1.8.0_202 (Oracle Corporation 25.202-b08)
OS:           Windows 10 10.0 amd64

gradle dev
Starting a Gradle Daemon (subsequent builds will be faster)

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'java-test-gradle'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.0.6.
     Required by:
         project : > org.springframework.boot:org.springframework.boot.gradle.plugin:3.0.6
      > No matching variant of org.springframework.boot:spring-boot-gradle-plugin:3.0.6 was found. The consumer was configured to find a library for use during runtime, compatible with Java 8, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '8.1.1' but:
          - Variant 'apiElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.6 declares a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component for use during compile-time, compatible with Java 17 and the consumer needed a component for use during runtime, compatible with Java 8
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '8.1.1')
          - Variant 'javadocElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.6 declares a component for use during runtime, 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 8)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '8.1.1')
          - Variant 'mavenOptionalApiElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.6 declares a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component for use during compile-time, compatible with Java 17 and the consumer needed a component for use during runtime, compatible with Java 8
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '8.1.1')
          - Variant 'mavenOptionalRuntimeElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.6 declares a library for use during runtime, 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 8
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '8.1.1')
          - Variant 'runtimeElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.6 declares a library for use during runtime, packaged as a jar, and its dependencies declared externally:
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '8.1.1')

그래들 빌드 에러가 났다.

 

그래들 버젼과 상관된 부분이 아니라 근본적으로 java17을 다시 깔고 진행하면 된다.

당연히 build.gradle의 java 버젼은 17이어야 하고 (인텔리제이로 프로젝트 생성했다면 자동 17)

group = 'com.mc.testexample'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'

 

인텔리제이 설정도 java17로 되어있어야 한다.