Appium：启动java测试用例时maven出现问题

我有要在设备上运行的测试用例（用Java编写）。appium服务器正在运行。现在，我通过命令mvn-Dtest=com.saucelabs.appium.SimpleTest运行了测试用例，但是我得到了以下结果：

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building java-client 2.1.0
[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: 10.669 s
[INFO] Finished at: 2014-11-25T17:16:59+05:30
[INFO] Final Memory: 4M/14M
[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

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我不知道我可能遗漏了什么。

我的系统上的网络限制（端口、防火墙等）问题。我试过我朋友的系统，它成功了。

我不完全同意这一点。sun.security.provider.certpath.SunCertPathBuilderException表示您无法使用信任存储证书（java）构建链。因此，发生这种情况的原因如下： 证书可能不是由有效的CA签署的，或者您必须已使用您的信任库文件。（无钥匙） 或者您的代理正在阻止OSCP响应