First of all please notice the nice alliteration in the headline.
A little problem which bugged me while searching the solution for  was that I had to change my checkstyle.xml and checkstyle-suppression.xml for several times. Unfortunately Eclipse-CS never noticed these modifications. So I restarted Eclipse every time to make the changes apply.
Then I stumbled by chance on an entry in Eclipse-CS’s bug tracker :
“Alternatively to touching the Checkstyle configuration file you can clear the plugin’s caches by clicking the little yellow refresh button on the Checkstyle preferences page.”
And hey—after putting on my glasses and lowering the nose-screen-distance to “way to near”—there it was: a little yellow button on the preference page!
-  http://rolf-engelhard.de/?p=239
-  http://sourceforge.net/tracker/?func=detail&aid=1752586&group_id=80344&atid=559497