just off my head:

(add-hook 'jde-mode-hook 
    (function (lambda() 
        (make-local-variable 'truncate-lines)
            (setq truncate-lines t))))

is this what you want?  also look at variable (C-h v)
truncate-partial-width-windows.

Igor Vaysenberg writes:

  Igor> Hi, I'm trying to set truncate long lines OFF in source buffer only.

  Igor> Is it possible?  How?

  Igor> thanks -- ____________________________________________________ Igor
  Igor> Vaysenberg Cisco Systems, EMBU e-mail: [EMAIL PROTECTED] 32
  Igor> HaMelaha st., phone: +972-9-892-7287 S. Netanya, 42504 fax:
  Igor> +972-9-892-7282 Israel


-- 
Danny Siu

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