Maven 错误无法传输工件 org.apache.maven.plugins:maven-source-plugin:pom:3.0。

Question

我正在尝试使用 maven 编译我的代码，出现以下错误，

环境

i am using azure devops server and using build pipeline Maven Errror Could not transfer artifact org.apache.maven.plugins:maven-source-plugin:pom:3.0.1 from/to central

2021-02-26T11:43:14.4764714Z [ERROR] Plugin org.apache.maven.plugins:maven-source-plugin:3.0.1 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-source-plugin:jar:3.0.1: Could not transfer artifact org.apache.maven.plugins:maven-source-plugin:pom:3.0.1 from/to central (https://repo.maven.apache.org/maven2): Transfer failed for https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-source-plugin/3.0.1/maven-source-plugin-3.0.1.pom ProxyInfo{host='12.3.4.59', userName='null', port=80, type='http', nonProxyHosts='null'}: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target -> [Help 1]

Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Answer 1

根据错误信息：

Transfer failed for https://repo.maven.apache.org/maven2...unable to find valid certification path to requested target

It shows the Maven is trying to download an indirect dependency from Maven Central Repository located at https://repo.maven.apache.org/maven 2, which is a secured HTTP server (HTTPS) . 所以问题可能来自您的证书本身或您的网络。

对于证书，尝试https://repo.maven.apache.org/maven2并下载证书，然后将其添加到 cacerts 中：

keytool -import -alias example -keystore  .\cacerts -file example.cer

请尝试从该线程“PKIX 路径构建失败”和“无法找到请求目标的有效证书路径”中查看更多信息

对于网络，请尝试在您的浏览器上访问非常 URL 并检查它是否可以运行。 如果您真的无法从浏览器中使用 HTTPS 访问 Maven Central Repo，可能是因为您使用了一些阻止您下载服务器证书的代理规则。

您可以设置settings.xml文件如下所示：

 <proxies>
     <proxy>
         <active>true</active>
         <protocol>https</protocol>
         <host>MY_COMPANY_HOST</host>
         <port>8080</port>
         <username>MY_USERNAME</username>
         <password>MY_PASSWORD</password>
         <nonProxyHosts>localhost</nonProxyHosts>
     </proxy>
     <proxy>
         <active>true</active>
         <protocol>http</protocol>
         <host>MY_COMPANY_HOST</host>
         <port>8080</port>
         <username>MY_USERNAME</username>
         <password>MY_PASSWORD</password>
         <nonProxyHosts>localhost</nonProxyHosts>
     </proxy>
 </proxies>

并检查在代理后面使用 Maven 和 SSL 的线程问题以获取更多详细信息。