maven - 如何在 Gradle 中将包装设置为 pom 而不是默认为 jar

Question

我有一个生成 Material list (BOM) 的项目。当我执行 gradle build 时，它会生成一个空 jar，其中仅包含一个 META-INF 文件夹。

但是我能够正确地将 pom (BOM) 发布到 Nexus，副作用是还上传了空 jar。

根据 maven 插件文档 https://docs.gradle.org/current/userguide/maven_plugin.html我们应该能够设置包装:

packaging archiveTask.extension

Here, uploadTask and archiveTask refer to the tasks used for uploading and generating the archive

如何将包装设置为pom？

Gradle 上传 pom 示例:

<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ttt.a</groupId>
  <artifactId>my-bom</artifactId>
  <version>Something-SNAPSHOT</version>

当我用maven而不是gradle上传的时候，还有一个额外的:

  <packaging>pom</packaging>

更新:

完整的 build.gradle 配置:

buildscript {
    repositories {
        maven {
            url "http://myrepo"
        }
    }
    dependencies {
        classpath "io.spring.gradle:dependency-management-plugin:1.0.4.RELEASE"
        classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.5"
        classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.7'
    } }

apply plugin: 'java' apply plugin: 'maven' apply plugin: "io.spring.dependency-management" apply plugin: "jacoco" apply plugin: 'org.asciidoctor.convert' apply plugin: 'org.sonarqube'

group = project.properties['groupId'] version = project.properties['version'].toString()

description = """Bill of Materials"""

sourceCompatibility = 1.8 targetCompatibility = 1.8

ext {
    xxx = '1.0.0'
    yyy = '1.2.0'
    ... }

repositories {
    maven {
        url "http://myrepo"
    } }

dependencyManagement {
    dependencies {
        dependency "com.myorg:xxx:${xxx}"
        dependency "com.myorg:yyy:${yyy}"
        ...
    } }

uploadArchives {
    repositories {
        mavenDeployer {
            snapshotRepository(url: 'http://myrepo') {
                authentication(userName: "$System.env.NEXUS_USER", password: "$System.env.NEXUS_PASSWORD")
            }
        }
    } }

asciidoctor {
    sourceDir = file('src/docs/asciidoc/')
    sources {
        include '*.adoc'
    }
    outputDir = file("build/docs/${version}") }

task generateDummyBom {
    doLast {
        project.buildDir.mkdirs()
        new File("$project.buildDir/dummy.pom").write("<project></project>\n")
    }
    ext.bomFile = file("$project.buildDir/dummy.pom") }

artifacts {
    archives(generateDummyBom.bomFile) {
        builtBy generateDummyBom
    } }

jar.enabled = false

Answer 1

我发现 maven 插件似乎忽略了 packaging 属性。经过一些实验，我发现它将 packaging 属性设置为 Artifact 中文件的扩展名。因此，将 packaging 属性设置为 pom 的方法是使用扩展名为 .pom 的文件创建虚拟 Artifact ，如下所示.

// The real file that we want to publish is the pom generated implicitly by the
// maven publishing plugin.
//
// We need to generate at least one file that we can call an archive so that the
// maven plugin will actually publish anything at all. Luckily, if the file
// that we call an archive is a .pom file, it's magically discarded, and we are
// only left with the implicitly-generated .pom file.
//
// We need the extension of the file to be `.pom` so that the maven plugin will
// set the pom packaging to `pom` (i.e. `<packaging>pom</packaging>`). Otherwise,
// packaging would be set to `xml` if our only file had an `.xml` extension.
task generateDummyBom {
  doLast {
    // Since we don't depend on anything else, we have to create the build dir
    // ourselves.
    project.buildDir.mkdirs()
    // The file actually has to have xml in it, or Sonatype will reject it
    new File("$project.buildDir/${project.artifactId}.pom").write("<project></project>\n")
  }
  ext.bomFile = file("$project.buildDir/${project.artifactId}.pom")
}

artifacts {
  archives(generateDummyBom.bomFile) {
    builtBy generateDummyBom
  }
}

jar.enabled = false

更新:如果您应用 java 插件，您将需要从您的存档中删除 jar 存档。

// Remove the default jar archive which is added by the 'java' plugin.
configurations.archives.artifacts.with { archives ->
  def artifacts = []
  archives.each {
    if (it.file =~ 'jar') {
      // We can't just call `archives.remove(it)` here because it triggers
      // a `ConcurrentModificationException`, so we add matching artifacts
      // to another list, then remove those elements outside of this iteration.
      artifacts.add(it)
    }
  }
  artifacts.each {
    archives.remove(it)
  }
}

第二次更新:将上面的“dummy.pom”替换为“${project.artifactId}”。