maven 3原型：生成错误
我按照 Apache Maven 网站上的说明进行操作，它工作正常，但在教程中我被要求输入以下代码，这是什么意思以及为什么它不断向我抛出构建错误？然而，我每次都尝试输入单行，而且所有内容都放在一起，没有任何区别。有人可以帮我解释一下这个以及如何开始使用 Maven 而不出错吗？
多谢， [更新] 下面出现SS
mvn archetype:generate \
-DarchetypeGroupId=org.apache.maven.archetypes \
-DgroupId=com.mycompany.app \
-DartifactId=my-app
错误，也更新了标题。
I followed the instructions on Apache Maven site and it works fine but during the tutorial i was asked to type in the below code, what does that mean and why does it keeps throwing me a build error?. However i tried to type single line everytime and also everything together nothing makes a difference. Could some one please help me interpret this one and how to get started with maven without errors?
Thanks a lot,
SS
mvn archetype:generate \
-DarchetypeGroupId=org.apache.maven.archetypes \
-DgroupId=com.mycompany.app \
-DartifactId=my-app
error below [UPDATE] , Updated the title also.
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感谢您的回复。我发现了问题，我在代理后面并且不知道maven中的代理功能，并且由于它是第一次运行，它试图下载一些插件并且失败了。现在我修复了它并且它可以正常工作。
谢谢，
SS
Thanks for your responses. I found the problem, i was behind a proxy and did not know the proxy feature in maven and as it was running for the first time, it was trying to download some plugins and failed. now i fixed it and it works as it should.
Thanks,
SS