<?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.解讀
- 倉(cāng)庫(kù)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：依賴(lài)倉(cāng)庫(kù)支持發(fā)布版本依賴(lài)下載，更新策略默認(rèn)為每天檢查一次墙基，不支持快版下載耕魄。
插件倉(cāng)庫(kù)發(fā)布版本依賴(lài)下載，更新策略為從不更新（意味著所有插件都要指定版本號(hào)策肝，并且不會(huì)更新），不支持快照版本下載隐绵。疑問(wèn)之众？
超級(jí)POM中為什么沒(méi)有指定default周期中默認(rèn)插件的版本信息？還是我沒(méi)找到依许？因?yàn)槿绻麤](méi)指定會(huì)正常根據(jù)更新策略解析發(fā)布版本構(gòu)件棺禾，而由上面可知，發(fā)布版本的更新策略為“從不更新”峭跳。
看其中一段,聲明了對(duì)插件maven-antrun-plugin的依賴(lài)
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.3</version>
</plugin>
進(jìn)入本地倉(cāng)庫(kù)查看發(fā)現(xiàn)有兩個(gè)版本1.3和1.8
Paste_Image.png
1.3版本內(nèi)容如下：說(shuō)明處于更新?tīng)顟B(tài)膘婶，還沒(méi)從遠(yuǎn)程倉(cāng)庫(kù)下載到。
maven-antrun-plugin-1.3構(gòu)件處于更新?tīng)顟B(tài)
1.8版本內(nèi)容如下：完整的插件
maven-antrun-plugin-1.8
maven-antrun-plugin-1.3.jar.lastUpdated中內(nèi)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=
說(shuō)明下載1.3版本失敗蛀醉。通過(guò)地址訪問(wèn)私服也沒(méi)有查看到相應(yīng)構(gòu)件悬襟。
更新構(gòu)件失敗，因?yàn)樵趎exus上沒(méi)找到該構(gòu)件
在nexus私服中搜索也只發(fā)現(xiàn)有1.8版本的插件
maven-antrun-plugin在遠(yuǎn)程倉(cāng)庫(kù)Nexus上的版本
