While viewing and editing a wall of text, it is useful to highlight the current line that the cursor lies in. This feature is in Eclipse and can be turned on easily:
Go to Window -> Preferences -> General -> Editors -> Text Editors. Enable the option named
Highlight current line.
If you still do not see current line highlighted, then the highlight color might be set to white or the same as background color of your theme. Go to same place as above, at the bottom you can see
Appearance color options. In that list, choose
Current line highlight option and set its color to something you like.
Tried with: Eclipse Luna 4.4.1 and Ubuntu 14.04