maven---超级pom

<?xml version="1.0" encoding="UTF-8"?>

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<!-- START SNIPPET: superpom -->
<project>
  <modelVersion>4.0.0</modelVersion>

  <repositories>
    <repository>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
      <layout>default</layout>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>

  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
      <layout>default</layout>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
    </pluginRepository>
  </pluginRepositories>

  <build>
    <directory>${project.basedir}/target</directory>
    <outputDirectory>${project.build.directory}/classes</outputDirectory>
    <finalName>${project.artifactId}-${project.version}</finalName>
    <testOutputDirectory>${project.build.directory}/test-classes</testOutputDirectory>
    <sourceDirectory>${project.basedir}/src/main/java</sourceDirectory>
    <scriptSourceDirectory>${project.basedir}/src/main/scripts</scriptSourceDirectory>
    <testSourceDirectory>${project.basedir}/src/test/java</testSourceDirectory>
    <resources>
      <resource>
        <directory>${project.basedir}/src/main/resources</directory>
      </resource>
    </resources>
    <testResources>
      <testResource>
        <directory>${project.basedir}/src/test/resources</directory>
      </testResource>
    </testResources>
    <pluginManagement>
      <!-- NOTE: These plugins will be removed from future versions of the super POM -->
      <!-- They are kept for the moment as they are very unlikely to conflict with lifecycle mappings (MNG-4453) -->
      <plugins>
        <plugin>
          <artifactId>maven-antrun-plugin</artifactId>
          <version>1.3</version>
        </plugin>
        <plugin>
          <artifactId>maven-assembly-plugin</artifactId>
          <version>2.2-beta-5</version>
        </plugin>
        <plugin>
          <artifactId>maven-dependency-plugin</artifactId>
          <version>2.8</version>
        </plugin>
        <plugin>
          <artifactId>maven-release-plugin</artifactId>
          <version>2.3.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

  <reporting>
    <outputDirectory>${project.build.directory}/site</outputDirectory>
  </reporting>

  <profiles>
    <!-- NOTE: The release profile will be removed from future versions of the super POM -->
    <profile>
      <id>release-profile</id>

      <activation>
        <property>
          <name>performRelease</name>
          <value>true</value>
        </property>
      </activation>

      <build>
        <plugins>
          <plugin>
            <inherited>true</inherited>
            <artifactId>maven-source-plugin</artifactId>
            <executions>
              <execution>
                <id>attach-sources</id>
                <goals>
                  <goal>jar</goal>
                </goals>
              </execution>
            </executions>
          </plugin>
          <plugin>
            <inherited>true</inherited>
            <artifactId>maven-javadoc-plugin</artifactId>
            <executions>
              <execution>
                <id>attach-javadocs</id>
                <goals>
                  <goal>jar</goal>
                </goals>
              </execution>
            </executions>
          </plugin>
          <plugin>
            <inherited>true</inherited>
            <artifactId>maven-deploy-plugin</artifactId>
            <configuration>
              <updateReleaseInfo>true</updateReleaseInfo>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </profile>
  </profiles>

</project>
<!-- END SNIPPET: superpom -->

2.解读

  • 仓库配置
<repositories>
<repository> 
<id>central</id> 
<name>Central Repository</name> 
<url>https://repo.maven.apache.org/maven2</url> 
<layout>default</layout>
 <snapshots> 
<enabled>false</enabled> 
</snapshots> 
</repository> 
</repositories>

<pluginRepositories>
 <pluginRepository>
 <id>central</id> 
<name>Central Repository</name> 
<url>https://repo.maven.apache.org/maven2</url> 
<layout>default</layout> 
<snapshots> 
<enabled>false</enabled> 
</snapshots>
 <releases> 
<updatePolicy>never</updatePolicy> 
</releases> 
</pluginRepository> 
</pluginRepositories>

  • 表明：依赖仓库支持发布版本依赖下载，更新策略默认为每天检查一次，不支持快版下载。
    插件仓库发布版本依赖下载，更新策略为从不更新（意味着所有插件都要指定版本号，并且不会更新），不支持快照版本下载。

  • 疑问？
    超级POM中为什么没有指定default周期中默认插件的版本信息？还是我没找到？因为如果没指定会正常根据更新策略解析发布版本构件，而由上面可知，发布版本的更新策略为“从不更新”。

看其中一段,声明了对插件maven-antrun-plugin的依赖

<plugin>
 <artifactId>maven-antrun-plugin</artifactId> 
<version>1.3</version> 
</plugin>

进入本地仓库查看发现有两个版本1.3和1.8


Paste_Image.png

1.3版本内容如下：说明处于更新状态，还没从远程仓库下载到。


maven-antrun-plugin-1.3构件处于更新状态

1.8版本内容如下：完整的插件


maven-antrun-plugin-1.8

maven-antrun-plugin-1.3.jar.lastUpdated中内容：


#NOTE: This is an Aether internal implementation file, its format can be changed without prior notice.
#Sun Dec 11 16:28:41 CST 2016
http\://172.19.201.155\:8081/repository/maven-public/.lastUpdated=1481444921950
http\://172.19.201.155\:8081/repository/maven-public/.error=

说明下载1.3版本失败。通过地址访问私服也没有查看到相应构件。


更新构件失败，因为在nexus上没找到该构件

在nexus私服中搜索也只发现有1.8版本的插件


maven-antrun-plugin在远程仓库Nexus上的版本
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