第一次创建Maven项目失败
报错信息如下：
Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to central (https://repo.maven.apache.org/maven2): Transfer failed for https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
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很多人说是maven路径和仓库路径不一致，可我的明显是一致的
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然后又找到说是镜像的问题，我打开报错信息的网址https://repo.maven.apache.org/maven2发现可以打开，镜像应该没问题，不过我还是抱着试一试的心态，在maven的conf目录下setting.xml文件添加了阿里云的镜像。
aliyunmaven * 阿里云公共仓库 https://maven.aliyun.com/repository/public
然后果然还是不行。问题依然存在。
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爆大招了，先不管这报错，我来运行一下：
不出意料的ERROR，但是，还是让我发现了不一样的东西：[INFO] ————————————————————————
[INFO] BUILD FAILURE
[INFO] ————————————————————————
[INFO] Total time: 1.917 s
[INFO] Finished at: 2020-12-11T17:14:39+08:00
[INFO] ————————————————————————
[ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to aliyunmaven (https://maven.aliyun.com/repository/public): Transfer failed for https://maven.aliyun.com/repository/public/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom: 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
这是证书错误，访问https协议的网站，需要ssl认证才行，这里没有证书，我们可以用下面的方式忽略ssl检查导致的问题。
-Dmaven.wagon.http.ssl.insecure=true -Dmaven.wagon.http.ssl.allowall=true
在下面这个地方也添加这行代码。
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