内网Maven工程配置

内网maven编译报错如下：

root@ubutun:/tsc-master# mvn clean compile
[INFO] Scanning for projects...
Downloading from central: https://repo.maven.apache.org/maven2/org/sonatype/plugins/nexus-staging-maven-plugin/1.6.7/nexus-staging-maven-plugin-1.6.7.pom
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-source-plugin is missing. @ line 148, column 21
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-javadoc-plugin is missing. @ line 137, column 21
[ERROR] Unresolveable build extension: Plugin org.sonatype.plugins:nexus-staging-maven-plugin:1.6.7 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.sonatype.plugins:nexus-staging-maven-plugin:jar:1.6.7 @
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project fi.iki.yak:compression-gorilla:2.1.2-SNAPSHOT (/beringei_java_client/gorilla-tsc-master/pom.xml) has 1 error
[ERROR]     Unresolveable build extension: Plugin org.sonatype.plugins:nexus-staging-maven-plugin:1.6.7 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.sonatype.plugins:nexus-staging-maven-plugin:jar:1.6.7: Could not transfer artifact org.sonatype.plugins:nexus-staging-maven-plugin:pom:1.6.7 from/to central (https://repo.maven.apache.org/maven2): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 2]
[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/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/PluginManagerException

需要配置代理和镜像，国外服务器下载太慢，而国内的maven源，oschina已经关闭，目前最好的方式，就是使用阿里云的镜像：代理和镜像配置如下

# vim /etc/maven/settings.xml

    
    
    optional
    
    true
    
    http
    
    c************
    *************
    
    ********
    ********
    
  


    
      alimaven
      aliyun maven
      http://maven.aliyun.com/nexus/content/groups/public/
      central