指定 SNAPSHOT 版本时不可解析的导入 POM

【问题标题】：Non-resolvable import POM when specifying SNAPSHOT version指定 SNAPSHOT 版本时不可解析的导入 POM
【发布时间】：2017-01-05 14:25:09
【问题描述】：

我正在尝试构建一个 maven 项目，该项目声明一个依赖管理部分，其中 pom 依赖项具有 S​​NAPSHOT 版本。但是，除非我设置非 SNAPSHOT 版本，否则它会拒绝构建。

我的 settings.xml 定义了这个镜像，它包含了我需要的所有快照版本：

<mirrors>
  <mirror>
    <id>public</id>
    <url>http://repoHost:8081/nexus/content/groups/public/</url>
    <mirrorOf>*</mirrorOf>
  </mirror>
</mirrors>

这是我认为是 pom 的相关部分：

<properties>
  <myArtifactId.version>1.0.0-SNAPSHOT</myArtifactId.version>
</properties>

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>myGroupId</groupId>
      <artifactId>myParentArtifactId</artifactId>
      <version>${myParentArtifactId.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>myGroupId</groupId>
    <artifactId>subproject1</artifactId>
  </dependency>
  <dependency>
    <groupId>myGroupId</groupId>
    <artifactId>subproject2</artifactId>
  </dependency>
  <dependency>
    <groupId>myGroupId</groupId>
    <artifactId>subproject3</artifactId>
  </dependency>
  <dependency>
    <groupId>myGroupId</groupId>
    <artifactId>subproject4</artifactId>
  </dependency>
  <dependency>
    <groupId>myGroupId</groupId>
    <artifactId>subproject5</artifactId>
  </dependency>
  <dependency>
    <groupId>myGroupId</groupId>
    <artifactId>subproject6</artifactId>
  </dependency>
</dependencies>

<distributionManagement>
  <snapshotRepository>
    <id>mySnapshots</id>
    <url>http://repoHost:8081/nexus/content/repositories/my-snapshots</url>
  </snapshotRepository>
  <repository>
    <id>myReleases</id>
    <url>http://repoHost:8081/nexus/content/repositories/my-releases</url>
  </repository>
</distributionManagement>

这是我看到的错误，更新了行和列引用以匹配上面的 pom sn-p：

PS > mvn -U -X -e clean
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T17:41:47+01:00)
Maven home: C:\dev\java\apache-maven-3.3.9\bin\..
Java version: 1.8.0_112, vendor: Oracle Corporation
Java home: C:\dev\java\jdk1.8.0_112\jre
Default locale: sv_SE, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos"
[DEBUG] Created new class realm maven.api
[DEBUG] Importing foreign packages into class realm maven.api
...
[INFO] Scanning for projects...
[DEBUG] Using mirror public (http://repoHost:8081/nexus/content/groups/public/) for central (https://repo.maven.apache.org/maven2).
[DEBUG] Extension realms for project exampleGroupId:ptexample:jar:1.0.0-SNAPSHOT: (none)
[DEBUG] Looking up lifecyle mappings for packaging jar from ClassRealm[plexus.core, parent: null]
[DEBUG] Could not find metadata myGroupId:myParentArtifactId:1.0.0-SNAPSHOT/maven-metadata.xml in local (C:\Users\cb2\.m2\repository)
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Non-resolvable import POM: Could not find artifact myGroupId:myParentArtifactId:pom:1.0.0-SNAPSHOT @ line 7, column 21
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject1:jar is missing. @ line 18, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject2:jar is missing. @ line 22, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject3:jar is missing. @ line 26, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject4:jar is missing. @ line 30, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject5:jar is missing. @ line 34, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject6:jar is missing. @ line 38, column 19
 @
[ERROR] The build could not read 1 project -> [Help 1]
org.apache.maven.project.ProjectBuildingException: Some problems were encountered while processing the POMs:
[ERROR] Non-resolvable import POM: Could not find artifact myGroupId:myParentArtifactId:pom:1.0.0-SNAPSHOT @ line 7, column 21
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject1:jar is missing. @ line 18, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject2:jar is missing. @ line 22, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject3:jar is missing. @ line 26, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject4:jar is missing. @ line 30, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject5:jar is missing. @ line 34, column 19
[ERROR] 'dependencies.dependency.version' for myGroupId:subproject6:jar is missing. @ line 38, column 19

        at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:422)
        at org.apache.maven.graph.DefaultGraphBuilder.collectProjects(DefaultGraphBuilder.java:419)
        at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor(DefaultGraphBuilder.java:410)
        at org.apache.maven.graph.DefaultGraphBuilder.build(DefaultGraphBuilder.java:83)
        at org.apache.maven.DefaultMaven.buildGraph(DefaultMaven.java:491)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:219)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
[ERROR]
[ERROR]   The project exampleGroupId:ptexample:1.0.0-SNAPSHOT (C:\projects\bitbucket\EW\pt-example\pom.xml) has 7 errors
[ERROR]     Non-resolvable import POM: Could not find artifact myGroupId:myParentArtifactId:pom:1.0.0-SNAPSHOT @ line 7, column 21 -> [Help 2]
org.apache.maven.model.resolution.UnresolvableModelException: Could not find artifact myGroupId:myParentArtifactId:pom:1.0.0-SNAPSHOT
        at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:197)
        at org.apache.maven.model.building.DefaultModelBuilder.importDependencyManagement(DefaultModelBuilder.java:1192)
        at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:455)
        at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:421)
        at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:620)
        at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:411)
        at org.apache.maven.graph.DefaultGraphBuilder.collectProjects(DefaultGraphBuilder.java:419)
        at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor(DefaultGraphBuilder.java:410)
        at org.apache.maven.graph.DefaultGraphBuilder.build(DefaultGraphBuilder.java:83)
        at org.apache.maven.DefaultMaven.buildGraph(DefaultMaven.java:491)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:219)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not find artifact myGroupId:myParentArtifactId:pom:1.0.0-SNAPSHOT
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:444)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)
        at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:294)
        at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:193)
        ... 23 more
Caused by: org.eclipse.aether.transfer.ArtifactNotFoundException: Could not find artifact myGroupId:myParentArtifactId:pom:1.0.0-SNAPSHOT
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:434)
        ... 27 more
[ERROR]     'dependencies.dependency.version' for myGroupId:subproject1:jar is missing. @ line 18, column 19
[ERROR]     'dependencies.dependency.version' for myGroupId:subproject2:jar is missing. @ line 22, column 19
[ERROR]     'dependencies.dependency.version' for myGroupId:subproject3:jar is missing. @ line 26, column 19
[ERROR]     'dependencies.dependency.version' for myGroupId:subproject4:jar is missing. @ line 30, column 19
[ERROR]     'dependencies.dependency.version' for myGroupId:subproject5:jar is missing. @ line 34, column 19
[ERROR]     'dependencies.dependency.version' for myGroupId:subproject6:jar is missing. @ line 38, column 19
[ERROR]
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

输出中的链接确实提供了一些线索，但我还是无法解决问题。

如果我只是更新以使用特定版本，我可以让它工作：

<properties>
  <myArtifactId.version>1.0.0</myArtifactId.version>
</properties>

但消除对 myParentArtifactId 依赖项的引用并在所有指定依赖项上指定 SNAPSHOT 版本也会失败，并出现初始“找不到工件”错误，就像上面的“myGroupId:myParentArtifactId”错误一样。

浏览我看到 Maven 正在使用的存储库时，我可以看到 SNAPSHOT 版本。问题是它为什么找不到那里的快照？

【问题讨论】：

    标签： java maven maven-3


    【解决方案1】：

    在提出这个问题时，我实际上设法找到了答案：

    我在我的 settings.xml 中添加了一个构建配置文件，它定义了在哪里查找快照：

    <profiles>
  <profile>
    <id>development-build</id>
    <activation>
      <activeByDefault>true</activeByDefault>
    </activation>      
    <repositories>
      <repository>
        <id>snaps</id>
        <url>http://repoHost:8081/nexus/content/repositories/my-snapshots</url>
        <snapshots>
          <enabled>true</enabled>
          <checksumPolicy>warn</checksumPolicy>
          <updatePolicy>always</updatePolicy>
        </snapshots>
      </repository>
    </repositories>
  </profile>
</profiles>

    现在一切都按预期进行。

    “橡皮鸭”太棒了！ :-)

    【讨论】：

    • 这是错误的解决方案。您必须更改 Nexus 的配置才能将 SNAPSHOT 存储库正确处理到公共组中。
    • 谢谢@khmarbaise！我会调查的。导致我只寻找客户端解决方案的原因是我是唯一一个遇到这个问题的人。直到昨天，我无法在任何其他机器上重现该错误。然后我发现通过擦除本地 Maven 缓存，如果没有这个额外的 repo 配置，任何机器上都会出现错误。因此，在我开始在这里工作之前，Nexus 服务器上的某些东西很可能已经发生了变化（我在这个地方还很新）。再次感谢您的提示！
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