java - Maven 无法下载 tomcat-maven-plugin 快照

Question

即使在清除了我的 settings.xml 之后，我在尝试使用此快照依赖项时仍然会收到此错误。鉴于依赖性:

<plugin>            
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>tomcat-maven-plugin</artifactId>
    <version>1.0-SNAPSHOT</version>
    <configuration>                 
        <path>/licensing</path>
        <tomcatWebXml>${basedir}/src/main/mock/web.xml</tomcatWebXml>
    </configuration>
</plugin>

并且(在 POM 中)，插件存储库定义:

<pluginRepository>
    <id>Codehaus Snapshots</id>
    <url>http://snapshots.repository.codehaus.org</url>
    <snapshots>
        <enabled>true</enabled>
    </snapshots>
    <releases>
        <enabled>true</enabled>  <!-- Workaround for MNG-2974, see note below -->
    </releases>
</pluginRepository> 

我留下了以下 404 错误。如果我真的导航到那个 repo，它正在寻找的 jar 不在那里，只有过时的(我不熟悉 Maven 最终如何解析预期的依赖项名称的机制)。

想法？

Downloading: http://snapshots.repository.codehaus.org/org/codehaus/mojo/tomcat-maven-plugin/1.0-SNAPSHOT/tomcat-maven-pl
ugin-1.0-SNAPSHOT.jar
[INFO] Unable to find resource 'org.codehaus.mojo:tomcat-maven-plugin:maven-plugin:1.0-SNAPSHOT' in repository Codehaus
Snapshots (http://snapshots.repository.codehaus.org)
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] A required plugin was not found: Plugin could not be found - check that the goal name is correct: Unable to downl
oad the artifact from any repository

Try downloading the file manually from the project website.

Then, install it using the command:
    mvn install:install-file -DgroupId=org.codehaus.mojo -DartifactId=tomcat-maven-plugin -Dversion=1.0-SNAPSHOT -Dpacka
ging=maven-plugin -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
    mvn deploy:deploy-file -DgroupId=org.codehaus.mojo -DartifactId=tomcat-maven-plugin -Dversion=1.0-SNAPSHOT -Dpackagi
ng=maven-plugin -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]


  org.codehaus.mojo:tomcat-maven-plugin:maven-plugin:1.0-SNAPSHOT

from the specified remote repositories:
  central (http://repo1.maven.org/maven2),
  Codehaus Snapshots (http://snapshots.repository.codehaus.org)


  org.codehaus.mojo:tomcat-maven-plugin:maven-plugin:1.0-SNAPSHOT

from the specified remote repositories:
  central (http://repo1.maven.org/maven2),
  Codehaus Snapshots (http://snapshots.repository.codehaus.org)


[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Wed Jan 06 10:06:49 EST 2010
[INFO] Final Memory: 14M/36M
[INFO] ------------------------------------------------------------------------

Answer 1

我重新检查了以下 pom 片段:

<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 http://maven.apache.org/maven-v4_0_0.xsd">
  ...
  <pluginRepositories>
    <pluginRepository>
      <id>Codehaus Snapshots</id>
      <url>http://snapshots.repository.codehaus.org/</url>
      <snapshots>
        <enabled>true</enabled>
      </snapshots>
      <releases>
        <enabled>true</enabled>  <!-- Workaround for MNG-2974, see note below -->
      </releases>
    </pluginRepository>
  </pluginRepositories>
  ...
  <build>
    <finalName>my-webapp</finalName>
    <plugins>
      ...
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>tomcat-maven-plugin</artifactId>
        <version>1.0-SNAPSHOT</version>
      </plugin>
      ...
    </plugins>
   ...
  </build>
</project>

插件的SNAPSHOT已经下载成功:

$ mvn clean
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building my-webapp Maven Webapp
[INFO]    task-segment: [clean]
[INFO] ------------------------------------------------------------------------
[INFO] snapshot org.codehaus.mojo:tomcat-maven-plugin:1.0-SNAPSHOT: checking for updates from Codehaus Snapshots
[INFO] snapshot org.codehaus.mojo:tomcat-maven-plugin:1.0-SNAPSHOT: checking for updates from maven2-repository.dev.java.net
Downloading: http://snapshots.repository.codehaus.org//org/codehaus/mojo/tomcat-maven-plugin/1.0-SNAPSHOT/tomcat-maven-plugin-1.0-20091222.232027-11.pom
5K downloaded  (tomcat-maven-plugin-1.0-20091222.232027-11.pom)
Downloading: http://snapshots.repository.codehaus.org//org/codehaus/mojo/tomcat-maven-plugin/1.0-SNAPSHOT/tomcat-maven-plugin-1.0-20091222.232027-11.jar
48K downloaded  (tomcat-maven-plugin-1.0-20091222.232027-11.jar)
[INFO] [clean:clean {execution: default-clean}]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9 seconds
[INFO] Finished at: Wed Jan 06 16:13:28 CET 2010
[INFO] Final Memory: 7M/78M
[INFO] ------------------------------------------------------------------------

这很奇怪，因为我看不出有什么不同，但一切都按预期进行。换句话说，我无法复制...

---

在您的本地存储库中，您是否在 tomcat-maven-plugin 工件的 1.0-SNAPSHOT 目录中有 maven-metadata*.xml 文件？它们与远程服务器上的匹配吗？他们是否正确指定了内部版本号和时间戳？

如果它们在本地不正确，使用 -U 运行 maven 可能会有所帮助。

您还可以检查 mvn help:effective-pom 并查看 Maven 认为 updatePolicy 是什么用于该存储库上的快照。

或者也许只是从本地存储库中删除您的 tomcat-maven-plugin 工件，然后重试。

如果没有任何帮助，请尝试手动安装(从存储库下载插件并使用 mvn install:install-file mojo)或从 VCS 检查源代码并在本地构建它。但是这些选项只是解决方法，您在某处遇到了问题(您使用的是什么版本的 maven？)。