auto-fill mode in java-mode

[Adam Hardy <emacs@cyberspaceroad.com>]

I'm trying to get my java-mode to wrap lines at 75 cols and I've not got 
it working. I'm pretty sure that my java-mode settings, which sets it up 
just how I want it except the wrapping, must be inhibiting auto-fill, 
but I can't see how. This is my java-mode lisp in .emacs:

(add-hook 'java-mode-hook
   '(lambda ()
      ;; Konfiguration des Javamodes
      (c-set-style '"Java")
      (setq c-basic-offset 4)
      (c-set-offset 'topmost-intro-cont c-basic-offset)
      (c-set-offset 'inline-open 0)
      (c-set-offset 'inclass 4)
      (c-set-offset 'substatement-open 0)
      (c-set-offset 'block-open '-)
      (c-set-offset 'objc-method-intro 'c-lineup-arglist-intro-after-paren)
      ;; Konfiguration verschiedener Features
      (setq c-electric-pound-behavior '(alignleft))
      ;; allgemeine Konfiguration
      (set-variable 'comment-column 40)
      ;; Konfiguration der Funktionalitaet der Returntaste
      (local-set-key [return] 'newline-and-indent)
      (local-set-key [S-return] 'newline)
      (local-set-key [C-return] 'c-mark-function)))

;; Turn on auto-fill-mode in desired modes
(setq-default fill-column 75)
(add-hook 'java-mode-hook 'turn-on-auto-fill)

Thanks for any help.

Adam

-- 
GNU Emacs 21.3.1 on Linux 2.4.20 RH9