maven 仓库加速及加载优先级

仓库优先级

1. 首先
   假如pom.xml 文件中设置了repository 优先级最高（前提没有被mirrof接管）
2. 其次setting.xml（mirrorOf 标签中值相同 ，靠前的优先级高）
   <mirrorOf>central</mirrorOf> 大于 <mirrorOf></mirrorOf>
   3 如果setting.xml设置了<mirrorOf></mirrorOf> ，那么在setting.xml和pom.xml中设置的<repository> 都将失效

localRepository 配置本地仓库

E:\maven_repository

mirror 可以拦截对远程仓库的请求 , 改变对目标仓库的下载地址

测试

配置maven环境

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1. 使用maven默认配置，从中央仓库下载依赖jar包 速度缓慢

   
   image.png

2. 切换阿里云仓库

   
   image.png

3. 切换nexus 私服

   
   image.png

4. 当有多个mirror 配置时 <mirrorOf>central</mirrorOf> 优先级高于<mirrorOf>*</mirrorOf>
   

   image.png

5. 注意 当<mirrorOf>central</mirrorOf>对应的仓库没有jar包时 配置<mirrorOf>*</mirrorOf>并不会兜底作为第二仓库继续寻找
   

   image.png 所以每个setting.xml 保留一个central 配置即可，默认第一个生效（多个相同<mirrorOf>central</mirrorOf>时）

6. 业务环境我们通常使用私服 且配置(<mirrorOf>*</mirrorOf>)

image.png

7. 当pom.xml 中也设置了repository 仓库时

• pom.xml 设置的repository仓库名为spring的优先级高于setting中配置的central中央仓库

    <repositories>
        <repository>
            <id>spring</id>
            <url>https://maven.aliyun.com/repository/spring</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>

image.png

• 当setting.xml文件中配置 时，会强制接手仓库代理
  -- <mirrof> 相当于一个拦截器，它会拦截maven对remote repository的相关请求，把请求里的remote repository地址，重定向到mirror里配置的地址

image.png

故障记录

[ERROR] Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: Failed to read artifact descriptor f
or org.apache.maven.plugins:maven-compiler-plugin:jar:3.1: org.apache.maven:maven-parent:pom:23 was not found in http://10.39.15.6:8081/repository/maven
-public/ during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of mynex
us has elapsed or updates are forced -> [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/PluginResolutionException
PS D:\JAVASTUDY\mvn-test> 

解决办法

mvn -U package