Eclipse Outline View is empty

Question

A simple one today. My Outline view in eclipse does not show me any methods or fields anymore. I have selected the few options that are available in the outline vie

Answer 1

I got the similar problem in PDT. Click the Outline view, but no response. Ctrl + O (Quick View) works. But the options (drop down-menu Filters) in outline view is also missing.

I tried to delete DLTK h2 database (*.db) files, but it doesn't work in my case.

Finally, I solved by below methods:

Method 1: As suggested, delete the whole .metadata folder (but lose all setting).
Method 2: Create new Window in Eclipse (Window > New Window).