为 spring 应用构建带有 spring 元素的库

Question

我尝试创建一个包含许多 spring 元素（实体、存储库）的库，该库将被其他 spring boot 应用程序使用

在我的 git 文件夹中我有 3 个文件夹

• 内联网
• 外联网
• 普通

我的 build.gradle for common

plugins {
    id 'java'
    id 'org.springframework.boot' version '3.0.3' apply false
    id 'io.spring.dependency-management' version '1.1.0'
}

group = 'com.acme.lib.common'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}


compileJava.options.encoding = "UTF-8"
compileTestJava.options.encoding = "UTF-8"


repositories {
    mavenCentral()
}

dependencyManagement {
    imports {
        mavenBom org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES
    }
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

tasks.named('test') {
    useJUnitPlatform()
}

当我尝试构建它时

gradlew clean build

我收到这个错误

* What went wrong:
A problem occurred configuring root project 'lib-common'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.0.3.
     Required by:
         project : > org.springframework.boot:org.springframework.boot.gradle.plugin:3.0.3
      > No matching variant of org.springframework.boot:spring-boot-gradle-plugin:3.0.3 was found. The consumer was configured to find a runtime of a library compatible with Java 8, 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:3.0.3 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 8
              - 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:3.0.3 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 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 '7.6.1')
          - Variant 'mavenOptionalApiElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.3 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 8
              - 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:3.0.3 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 8
              - 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:3.0.3 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 8
              - 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:3.0.3 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 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 '7.6.1')

编辑

我现在没有收到任何错误，但是我没有看到在构建文件夹中创建任何 jar

Answer 1

在报错中可以看到：

没有说明它的目标 Java 版本（需要与 Java 8 兼容）

看来您正在使用 Java 8 构建基于 Spring Framework 6 的 Spring Boot 3。两者都至少需要 Java 17；有关详细信息，请参阅博客文章。