"Go to implementation" repeats itself?

I have the problem that the "Go to implementation" popup (Ctrl-Alt-B) brings up multiple entries for some methods. E.g. for the following code

 map =
		new HashMap ();

	public static void main (String[] args) {
		map.values ().toArray (new String [map.size ()]);

	}
}]]>

when I put the cursor on the toArray call and hit Alt-Ctrl-B I get a list of hundreds of possible implementations, of which about three quarters are exact duplicates! I emptied my caches, but no joy. Anybody else seeing this?