我希望你有充分的理由 不 来关注标准目录布局，否则考虑重新排列文件夹：它将使您的生活更轻松（以及您的同事）。
我的猜测是没有编译任何东西。在这种情况下：删除maven-compiler-plugin的配置就足够了。

I hope you have good reason not to follow the standard directory layout, otherwise consider to rearrange the folders: it will make your life a lot easier (as well as for your co-workers). My guess is that nothing has been compiled. In that case: removing the configuration of the maven-compiler-plugin should be enough.