Question: I do not understand why this is happening.
General answer: http://www.ihateeclipse.com/
( , Eclipse IDE, - , ).
:
1.) eclipse ? , ?. ( 80% " ", ).
2.) - , ( , โโ), , eclipse. , " " (Ctrl + T) , Eclipse ( , t - , , "", ).
, " reset", : http://letsgetdugg.com/2009/04/19/recovering-a-corrupt-eclipse-workspace/ http://blog.pdark.de/2011/09/02/restoring-a-corrupted-workspace-in-eclipse/ (: ).
3.) - , .metadata, (, , ..). eclipse ).
4.) 1-3, Eclipse ( 3 ) IDE, .
5.) , , - , , ).
, . , SO- , , eclipse , (, , Bug..., , ) " " , ( 5 , Eclipse -clean Maven , , - , )