[eclipse] Eclipse - "Workspace in use or cannot be created, chose a different one."

I've seen 3 other fixes so far:

  1. in .metadata/, rm .lock file
  2. if 1) doesn't work, try end process javaw.exe etc. to exit the IDE
  3. if 1)&2) doesn't work, try rm .log file in .metadata/, and double check .plugin/.
  4. This always worked for me: relocate .metadata/, open and close eclipse, then overwrite .metadata back

The solution boils down to clean up the .metadata folder with correct contents