Fix Eclipse java references database corruption?

Question

How do I make eclipse rebuild the database of classes contained within a project or workspace? This is what it uses to make the \"References\" menu action work, what it uses

Answer 1

For me it was a filter... Pressing CTRL + G on Windows Eclipse Luna having 'Potential Matches' actually CHECKED made the problem go away.

As searching for a clear() method would return all sorts of different results.