Eclipse maven插件只下载JAR包而不是AAR包答案

【问题标题】：Eclipse maven plugin only download JAR package instead of AAR packageEclipse maven插件只下载JAR包而不是AAR包
【发布时间】：2021-10-26 04:16:04
【问题描述】：

我使用 Eclipse（版本 2021-06）创建了一个简单的测试项目，然后以“-e dependency:go-offline”的形式运行 Maven build。

注意：我之前已经和 Gradle 同步过依赖，所有的工件都已经被 Gradle 下载了。现在我只想在测试 Maven 项目中使用该依赖项。

这里是测试项目 pom.xml 供参考：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    
    <groupId>test_project</groupId>
    <artifactId>test_project</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    
    <packaging>pom</packaging>
    
    <name>test_project</name>
    <description>test_project</description>
    
    <dependencies>
        <dependency>
            <groupId>androidx.activity</groupId>
            <artifactId>activity</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>
</project>

这里是maven插件下载到本地目录的activity-1.3.1.pom：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <!-- This module was also published with a richer model, Gradle metadata,  -->
  <!-- which should be used instead. Do not delete the following line which  -->
  <!-- is to indicate to Gradle or any Gradle module metadata file consumer  -->
  <!-- that they should prefer consuming it instead. -->
  <!-- do_not_remove: published-with-gradle-metadata -->
  <modelVersion>4.0.0</modelVersion>
  <groupId>androidx.activity</groupId>
  <artifactId>activity</artifactId>
  <version>1.3.1</version>
  <packaging>aar</packaging>
  <name>Activity</name>
  <description>Provides the base Activity subclass and the relevant hooks to build a composable structure on top.</description>
  <url>https://developer.android.com/jetpack/androidx/releases/activity#1.3.1</url>
  <inceptionYear>2018</inceptionYear>
  <licenses>
    <license>
      <name>The Apache Software License, Version 2.0</name>
      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
      <distribution>repo</distribution>
    </license>
  </licenses>
  <developers>
    <developer>
      <name>The Android Open Source Project</name>
    </developer>
  </developers>
  <scm>
    <connection>scm:git:https://android.googlesource.com/platform/frameworks/support</connection>
    <url>https://cs.android.com/androidx/platform/frameworks/support</url>
  </scm>
  <dependencies>
    <dependency>
      <groupId>androidx.annotation</groupId>
      <artifactId>annotation</artifactId>
      <version>1.1.0</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>androidx.core</groupId>
      <artifactId>core</artifactId>
      <version>1.1.0</version>
      <scope>compile</scope>
      <type>aar</type>
    </dependency>
    <dependency>
      <groupId>androidx.lifecycle</groupId>
      <artifactId>lifecycle-runtime</artifactId>
      <version>2.3.1</version>
      <scope>compile</scope>
      <type>aar</type>
    </dependency>
    <dependency>
      <groupId>androidx.lifecycle</groupId>
      <artifactId>lifecycle-viewmodel</artifactId>
      <version>2.3.1</version>
      <scope>compile</scope>
      <type>aar</type>
    </dependency>
    <dependency>
      <groupId>androidx.savedstate</groupId>
      <artifactId>savedstate</artifactId>
      <version>1.1.0</version>
      <scope>compile</scope>
      <type>aar</type>
    </dependency>
    <dependency>
      <groupId>androidx.lifecycle</groupId>
      <artifactId>lifecycle-viewmodel-savedstate</artifactId>
      <version>2.3.1</version>
      <scope>compile</scope>
      <type>aar</type>
    </dependency>
    <dependency>
      <groupId>androidx.collection</groupId>
      <artifactId>collection</artifactId>
      <version>1.0.0</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>androidx.tracing</groupId>
      <artifactId>tracing</artifactId>
      <version>1.0.0</version>
      <scope>runtime</scope>
      <type>aar</type>
    </dependency>
  </dependencies>
</project>

这是控制台输出供参考：

从控制台可以看到maven插件已经下载了pom.xml文件，应该知道打包类型是“AAR”！

...
[INFO] <<< maven-dependency-plugin:2.8:go-offline (default-cli) < :resolve-plugins @ test_project <<<
[INFO] 
[INFO] Downloading from mycompany-mirror: https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.pom
[INFO] Downloaded from mycompany-mirror: https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.pom (3.2 kB at 51 kB/s)
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project test_project: Could not resolve dependencies for project test_project:test_project:pom:0.0.1-SNAPSHOT: Could not transfer artifact androidx.activity:activity:jar:1.3.1 from/to mycompany-mirror (https://mycompany.com/archiva/repository/internal): transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal on project test_project: Could not resolve dependencies for project test_project:test_project:pom:0.0.1-SNAPSHOT: Could not transfer artifact androidx.activity:activity:jar:1.3.1 from/to mycompany-mirror (https://mycompany.com/archiva/repository/internal): transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource.
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (LifecycleDependencyResolver.java:269)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies (LifecycleDependencyResolver.java:147)
    at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved (MojoExecutor.java:248)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:202)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:78)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: org.apache.maven.project.DependencyResolutionException: Could not resolve dependencies for project test_project:test_project:pom:0.0.1-SNAPSHOT: Could not transfer artifact androidx.activity:activity:jar:1.3.1 from/to mycompany-mirror (https://mycompany.com/archiva/repository/internal): transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource.
    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve (DefaultProjectDependenciesResolver.java:209)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (LifecycleDependencyResolver.java:243)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies (LifecycleDependencyResolver.java:147)
    at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved (MojoExecutor.java:248)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:202)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:78)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: org.eclipse.aether.resolution.DependencyResolutionException: Could not transfer artifact androidx.activity:activity:jar:1.3.1 from/to mycompany-mirror (https://mycompany.com/archiva/repository/internal): transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource.
    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies (DefaultRepositorySystem.java:357)
    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve (DefaultProjectDependenciesResolver.java:202)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (LifecycleDependencyResolver.java:243)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies (LifecycleDependencyResolver.java:147)
    at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved (MojoExecutor.java:248)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:202)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:78)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not transfer artifact androidx.activity:activity:jar:1.3.1 from/to mycompany-mirror (https://mycompany.com/archiva/repository/internal): transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource.
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve (DefaultArtifactResolver.java:424)
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts (DefaultArtifactResolver.java:229)
    at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveDependencies (DefaultRepositorySystem.java:340)
    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve (DefaultProjectDependenciesResolver.java:202)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (LifecycleDependencyResolver.java:243)
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies (LifecycleDependencyResolver.java:147)
    at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved (MojoExecutor.java:248)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:202)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:78)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Could not transfer artifact androidx.activity:activity:jar:1.3.1 from/to mycompany-mirror (https://mycompany.com/archiva/repository/internal): transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource.
    at org.eclipse.aether.connector.basic.ArtifactTransportListener.transferFailed (ArtifactTransportListener.java:52)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run (BasicRepositoryConnector.java:369)
    at org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run (RunnableErrorForwarder.java:75)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1130)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:630)
    at java.lang.Thread.run (Thread.java:831)
Caused by: org.apache.maven.wagon.TransferFailedException: transfer failed for https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar, status: 500 Unable to fetch artifact resource.
    at org.apache.maven.wagon.providers.http.wagon.shared.AbstractHttpClientWagon.fillInputData (AbstractHttpClientWagon.java:1204)
    at org.apache.maven.wagon.providers.http.wagon.shared.AbstractHttpClientWagon.fillInputData (AbstractHttpClientWagon.java:1140)
    at org.apache.maven.wagon.StreamWagon.getInputStream (StreamWagon.java:126)
    at org.apache.maven.wagon.StreamWagon.getIfNewer (StreamWagon.java:88)
    at org.apache.maven.wagon.StreamWagon.get (StreamWagon.java:61)
    at org.eclipse.aether.transport.wagon.WagonTransporter$GetTaskRunner.run (WagonTransporter.java:546)
    at org.eclipse.aether.transport.wagon.WagonTransporter.execute (WagonTransporter.java:430)
    at org.eclipse.aether.transport.wagon.WagonTransporter.get (WagonTransporter.java:407)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask (BasicRepositoryConnector.java:457)
    at org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run (BasicRepositoryConnector.java:364)
    at org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run (RunnableErrorForwarder.java:75)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1130)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:630)
    at java.lang.Thread.run (Thread.java:831)
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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/DependencyResolutionException

但 maven 插件不断请求 jar：

https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.jar

它应该像这样请求 aar：

https://mycompany.com/archiva/repository/internal/androidx/activity/activity/1.3.1/activity-1.3.1.aar

Eclipse maven 插件是否缺少某些配置？为什么不下载aar文件？如何解决这个问题？

谢谢。

【问题讨论】：

标签： java eclipse maven

【解决方案1】：

需要显式声明包类型，如果省略类型，默认为jar。

<dependency>
    <groupId>androidx.activity</groupId>
    <artifactId>activity</artifactId>
    <version>1.3.1</version>
    <type>aar</type>
</dependency>

它应该知道包装类型是“AAR”！

不，不应该。顺便说一句，在同一个 pom.xml 中，你在依赖项上看到 <type>aar</type> 吗？它的存在也是出于同样的目的。

【讨论】：

但是我不需要 Gradle 中的打包类型： implementation 'androidx.activity:activity:1.3.1'，另外，maven 插件已经下载了 pom.xml 文件，它应该已经知道打包类型是AAR，所以不用在Maven依赖标签中声明类型应该是没有问题的。
maven != gradle，虽然它们使用类似的依赖机制
你应该阅读更多关于 maven 的信息。在目标 pom.xml 中声明的 <package> 与您需要的类型无关。依赖构建可以从单个 pom.xml 生成多个附加的工件（类型）——它不知道你想要什么。同样，默认为jar
我已经尝试过您的解决方案并且它有效。感谢您提供有关 Maven 构建的信息。非常感谢！