Unable to debug in Java with eclipse

Question

I am trying to debug a simple Java application on my machine using Eclipse as an IDE. When I try to debug the application by entering the Debug Perspective, I set a breakpoi

Answer 1

I was getting the same error on my ubuntu machine because of a mishap with the /etc/hosts file. I had commented out the mapping of localhost to 127.0.0.1, and to complicate matters further there was a swap file hanging around.

This was the first line of my /etc/hosts:

127.0.0.1       #localhost

Deleting the # fixed the problem, whereas rebooting understandably had not.