Eclipse，包消失了？
我很少使用复杂的 IDE（我更喜欢简单的编辑器和命令行工具），而我与 Eclipse 的斗争最终让我陷入了无法摆脱的困境。我什至不明白发生了什么，所以我将提供我认为相关的细节 - 请随意忽略，或要求更多。
我通过 m2eclipse 为 Java 项目安装了 Maven 管理，下载了索引，安装了一些依赖项，手动编辑 pom，然后……
包树从左侧窗格中消失了。文件夹仍然存在，我可以打开所有文件并编辑它们； JRE 库节点在那里，Maven 节点在那里，除了经典的包/类树之外的所有东西。
我猜我仍然可以通过浏览文件夹来工作，但是 Eclipse 提供的许多工具（例如重构）不可用。
非常感谢您的帮助！
I rarely use complex IDEs (I favor simple editors and command-line tools) and my struggles with Eclipse have finally driven me into a corner I can't get out of. I don't even understand what happened, so I'll provide what details I feel are relevant -- feel free to ignore, or ask for more.
I installed Maven management for a Java project through m2eclipse, downloaded the indexes, installed some dependencies manually editing the pom, and...
... the package tree dissappeard from the left pane. The folders are still there, I can open all the files and edit them; the JRE library node is there, the Maven node is there, everything but the classical package/class tree.
I can still work by going through the folders, I guess, but many of the tools Eclipse provides (e.g. refactoring) are not available.
Help would be most appreciated!
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这些文件夹似乎未配置为源文件夹。您是否有适当的 Maven 文件夹结构，例如 src/main/java、src/main/resources 等？如果是这样，则右键单击该项目并在“Maven”子菜单中选择“更新项目配置”。那么项目结构应该是正确的。
It seems, that the folders are not configured as source folders. Do you have the appropriate Maven folder structure, e.g. src/main/java, src/main/resources etc.? If so, then right click on the project and select "Update Project configuration" in the "Maven" sub menu. Then the project structure should be correct.
确保所有源文件夹都位于 /src 下。
我的主要疑问是你可能搞砸了或者最糟糕的是，删除了一些配置文件，无论是 Maven 特定的（我不知道）还是 Eclipse 特定的。请注意，有许多由 eclipse 创建的隐藏/非隐藏文件。
另外，尝试刷新项目并重新启动 IDE。看似微不足道，但有时确实有效。
Make sure that all the source folders in under /src.
The main doubt I have is you have probably messed up or worst, deleted some config file, either Maven specific (which I don't know) or eclipse specific. Note that there are many hidden/non-hidden files which are created by eclipse.
Also, try refreshing project and restarting the IDE. Seems trivial but sometimes works.