删除日志和.lock不起作用，但是

-clean选项为我修复了它。

下面是解决这个问题的几个步骤。4步对我来说很有用。

Delete .log files along .metadata folder. Check the current user permission make sure to check the full control checkbox click apply then OK. If you run system drive defragmentation or maintenance before you run eclipse editor sometimes original file path are not in their respective path to make sure run "previous version" time before your system maintenance of your drive where the eclipse workbench or something similar to this was saved. This last option is works for me. Check the drive letter of your current drive where the code editor was saved. If something unusual e.g before your maintenance your drive letter is K then after defragment or maintenance. The drive letter is now L hence you should change the drive letter to its original one that is K. to do this click the ff: Open control panel System & security Administrative tools Computer management Disk management in disk mngt choose the Drive example L then right click > change drive letter & path > click remove > then ok, open it again then > click add and > choose your original drive letter for that drive then click ok. If you use your computer for a long period of time do restart first to refresh everything.

对我来说，有效的方法是重新启动系统。(ubuntu 20.04)

如果没有工作，另一种可能的情况是看到有一个正在运行的Java应用程序。可能是您以前的打开和关闭留下了未杀死的Java实例。

如果有两个java实例，请检查是否有正在运行的java实例，至少需要杀死一个。但是，大多数时候我杀死任何java运行:)，因为java使用的工作空间更早，如果不杀死它仍然会。 如果您想要多个IDE用于不同或相同的项目，请更改另一个工作空间，但您应该在打开IDE后导入项目窗体工作空间。

进入任务管理器(在任务栏中单击右键)，选择进程菜单栏，选择eclipse.exe，单击EndProcess

看起来你的工作空间是在Java TM中使用的，打开任务管理器并关闭eclipse.exe和Java TM进程。