To resolve the issue delete .lock file under  workspace/.metadata/ and re-import the project using below steps

Inside package explorer, right click -> import -> General -> Existing Projects into Workspace -> next -> find your project in "Select root directory" -> Finish

Also you can  re-created workspace and imported projects again.Creating a new workspace is done via:

File > Switch Workspace


Regards,
Abhishek Tiwari
edureka! Support Team
On Sat, 9 Apr at 8:38 AM , Sid23.vyas <sid23.vyas@yahoo.com> wrote:
Cannot determine URI for "/Sidhu/src/Country6.java".
my whole java project is deleted why this thing has happened

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