Disable whitespace-mode in java-mode

.dir-locals.el

;; The 'nil' configuration applies to all modes.                                                                                                                                                                
((nil . (
         (indent-tabs-mode . t)                                                                                                                                                                                 
         (tab-width . 4)))                                                                                                                                                                                      
 (java-mode . (
               (show-trailing-whitespace . nil)
               (eval . (global-whitespace-mode 0))))                                                                                                                                                            
 )