maven-resources-plugin:2.6 or one of its dependencies could not be resolved

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本猿想把maven默认仓库改成自己文件夹的时候不小心删掉了~/.m2/repository里面所有的jar。当再次install时出现下面的错误。

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jinyaoyuan:maven jinyaoyuan$ mvn install
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building hello-first SNAPSHOT-0.0.1
[INFO] ------------------------------------------------------------------------
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/2.6/maven-resources-plugin-2.6.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.021 s
[INFO] Finished at: 2016-05-25T12:20:48+08:00
[INFO] Final Memory: 7M/155M
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6: Could not transfer artifact org.apache.maven.plugins:maven-resources-plugin:pom:2.6 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 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

看日志发现downloading不下来，以后是网络问题，直接访问链接发现可以访问，尼玛这是什么问题呢。找了很多blog，发现自己前段时间做cas时改了jre中lib库里的security里面的一个文件cacerts。然后恢复成原来的就OK了，简直神奇啊，那cacerts这个文件到底是干嘛的呢？这个文件是一个证书，有心的读者会看到上面的链接是https开头的，访问的时候客户端是需要这个cacerts文件授权滴。