为什么 maven 强制插件插件在 maven 版本 3.6.1 中失败但在 3.6.2 中通过？

【问题标题】：Why is maven enforcer plugin failing with maven version 3.6.1 but passing with 3.6.2?为什么 maven 强制插件插件在 maven 版本 3.6.1 中失败但在 3.6.2 中通过？
【发布时间】：2020-08-29 06:42:53
【问题描述】：

在我的一个项目中，我正在尝试将 DependencyConvergence 规则与 maven enforcer 插件一起使用。我观察到，如果我使用 Maven 3.6.1，那么执行器会因以下错误而失败，但同样适用于 maven 3.6.2。

有人可以告诉我 Maven 3.6.2 中的哪些更改导致 DependencyConvergence 传入 3.6.2 但在低于 3.6.2 的其他 maven 版本中失败？

我在GitHub 上放置了一个示例项目，可以在其中重现此问题。

Debrajs-MacBook-Air:es-plugins debrajmanna$ java -version
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

maven-enforcer-plugin - 3.0.0-M2

Debrajs-MacBook-Air:es-plugins debrajmanna$ ~/Downloads/apache-maven-3.6.1/bin/mvn validate
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] es-plugins                                                         [pom]
[INFO] dedup                                                              [jar]
[INFO]
[INFO] -----------------------< org.example:es-plugins >-----------------------
[INFO] Building es-plugins 1.0-SNAPSHOT                                   [1/2]
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (javaversion-dependencyconvergence) @ es-plugins ---
[INFO]
[INFO] -------------------------< org.example:dedup >--------------------------
[INFO] Building dedup 1.0-SNAPSHOT                                        [2/2]
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (javaversion-dependencyconvergence) @ dedup ---
[WARNING]
Dependency convergence error for com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.1 paths to dependency are:
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.1
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.apache.lucene:lucene-test-framework:8.5.1
      +-com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.2

[WARNING]
Dependency convergence error for commons-logging:commons-logging:1.2 paths to dependency are:
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpclient:4.5.10
        +-commons-logging:commons-logging:1.2
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpasyncclient:4.1.4
        +-commons-logging:commons-logging:1.2
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-commons-logging:commons-logging:1.1.3
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client-sniffer:7.7.1
      +-commons-logging:commons-logging:1.1.3
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-commons-logging:commons-logging:1.1.3

[WARNING]
Dependency convergence error for org.apache.httpcomponents:httpcore:4.4.12 paths to dependency are:
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpclient:4.5.10
        +-org.apache.httpcomponents:httpcore:4.4.12
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpcore:4.4.12
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpasyncclient:4.1.4
        +-org.apache.httpcomponents:httpcore:4.4.10
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client-sniffer:7.7.1
      +-org.apache.httpcomponents:httpcore:4.4.12

[WARNING]
Dependency convergence error for org.apache.httpcomponents:httpclient:4.5.10 paths to dependency are:
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpclient:4.5.10
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpasyncclient:4.1.4
        +-org.apache.httpcomponents:httpclient:4.5.6
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client-sniffer:7.7.1
      +-org.apache.httpcomponents:httpclient:4.5.10

[WARNING]
Dependency convergence error for org.apache.httpcomponents:httpcore-nio:4.4.10 paths to dependency are:
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpasyncclient:4.1.4
        +-org.apache.httpcomponents:httpcore-nio:4.4.10
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.elasticsearch.client:elasticsearch-rest-client:7.7.1
      +-org.apache.httpcomponents:httpcore-nio:4.4.12

[WARNING] Rule 0: org.apache.maven.plugins.enforcer.DependencyConvergence failed with message:
Failed while enforcing releasability. See above detailed error message.
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for es-plugins 1.0-SNAPSHOT:
[INFO]
[INFO] es-plugins ......................................... SUCCESS [  3.047 s]
[INFO] dedup .............................................. FAILURE [  0.856 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.131 s
[INFO] Finished at: 2020-08-29T11:41:55+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:3.0.0-M2:enforce (javaversion-dependencyconvergence) on project dedup: Some Enforcer rules have failed. Look above for specific messages explaining why the rule failed. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[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/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :dedup

同样适用于 Maven 3.6.2。

Debrajs-MacBook-Air:es-plugins debrajmanna$ ~/Downloads/apache-maven-3.6.2/bin/mvn validate
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] es-plugins                                                         [pom]
[INFO] dedup                                                              [jar]
[INFO]
[INFO] -----------------------< org.example:es-plugins >-----------------------
[INFO] Building es-plugins 1.0-SNAPSHOT                                   [1/2]
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (javaversion-dependencyconvergence) @ es-plugins ---
[INFO]
[INFO] -------------------------< org.example:dedup >--------------------------
[INFO] Building dedup 1.0-SNAPSHOT                                        [2/2]
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-enforcer-plugin:3.0.0-M2:enforce (javaversion-dependencyconvergence) @ dedup ---
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for es-plugins 1.0-SNAPSHOT:
[INFO]
[INFO] es-plugins ......................................... SUCCESS [  1.743 s]
[INFO] dedup .............................................. SUCCESS [  0.510 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.462 s
[INFO] Finished at: 2020-08-29T11:42:06+05:30
[INFO] ------------------------------------------------------------------------

【问题讨论】：

  • 不幸的是，我无法重现此问题。此外，如果我跳过执行者，整个项目将无法构建......
  • 你试过哪个 maven 版本？我尝试使用 maven 3.6.1、3.5.3 和 3.6.3。它仅适用于 3.6.3。
  • 这是更大项目的一部分，我试图简化事情并错过了删除装配部分，因为我们只对validate 阶段感兴趣。无论如何，我已经更新了项目代码。如果你现在只注释掉 es-plugins 中的 maven-enforcer-plugin 部分，它会构建得很好。
  • 您是否设置了一些环境变量，例如M2_HOME 或类似的东西？
  • 下次请尝试所有次要版本，直到确定错误的确切位置，因为事实证明 3.6.2 也可以。我编辑了你的问题以反映这一点。本来可以节省我几分钟的时间。 :) 无论如何，没什么大不了的。

标签： java maven java-8 maven-3


【解决方案1】：

它与MENFORCER-195 和MNG-6713 有关，它们是Maven 3.6.2 中修复的错误。

如果您使用的是 3.6.2，请小心，因为该区域中有 a further regression，直到 3.6.3 才修复（不影响您的示例）。

我是如何找到这些票的：

让我们分别看一下每个故障。从第一个开始是有意义的：

Dependency convergence error for com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.1 paths to dependency are:
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.1
and
+-org.example:dedup:1.0-SNAPSHOT
  +-org.elasticsearch.test:framework:7.7.1
    +-org.apache.lucene:lucene-test-framework:8.5.1
      +-com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.2

我们来看看org.elasticsearch.test:framework's POM的相关部分：

<dependency>
    <groupId>com.carrotsearch.randomizedtesting</groupId>
    <artifactId>randomizedtesting-runner</artifactId>
    <version>2.7.1</version>
    <scope>compile</scope>
    <exclusions>
        <exclusion>
            <artifactId>*</artifactId>
            <groupId>*</groupId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.apache.lucene</groupId>
    <artifactId>lucene-test-framework</artifactId>
    <version>8.5.1</version>
    <scope>compile</scope>
    <exclusions>
        <exclusion>
          <artifactId>*</artifactId>
          <groupId>*</groupId>
      </exclusion>
    </exclusions>
</dependency>

很明显，我们可以看到 Lucene 的所有传递依赖项都应该被排除。但是，如果我们回到这部分错误，Enforcer 插件所抱怨的 2.7.2 版本甚至不应该在依赖关系树中！

...
   +-org.apache.lucene:lucene-test-framework:8.5.1
        +-com.carrotsearch.randomizedtesting:randomizedtesting-runner:2.7.2

当我为两个版本的 Maven（3.6.1 和 3.6.2）打印 Maven 依赖树时，我看到的唯一 randomizedtesting-runner 实例是 2.7.1 版本，所以这里发生了一些可疑的事情。

我的直觉告诉我，通配符排除可能是罪魁祸首，所以从那里只需搜索the release notes 以查找“排除”或“通配符”之类的内容。事实证明我是对的。

【讨论】：

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