Errno::EACCES (Permission denied - Permission denied - Paperclip+Jruby+RMagick4j

If The issue Like:
===========================================================================================
Processing UsersController#upload_photo (for 125.18.56.182 at 2009-12-09 00:29:27) [POST]
Parameters: {"authenticity_token"=>"9w6TN5+/SsEp90euL2/qX/z+/v/RGkwPy7jKCmA1Z2A=", "user"=>{"photo"=>#}, "x"=>"31", "y"=>"16"}
User Load (3.0ms) SELECT * FROM `users` WHERE (`users`.`id` = 29) LIMIT 1
User Load (3.0ms) SELECT `users`.id FROM `users` WHERE (LOWER(`users`.`screen_name`) = 'shrii' AND `users`.id <> 29) LIMIT 1
User Load (3.0ms) SELECT `users`.id FROM `users` WHERE (LOWER(`users`.`email`) = 'shrikant.lokhande@betterlabs.net' AND `users`.id <> 29) LIMIT 1
User Update (2.0ms) UPDATE `users` SET `photo_file_name` = '3d_animals_11.jpg', `photo_content_type` = 'image/jpeg', `photo_file_size` = 0, `non_login_key` = '7276c63c3af812a1d7b9dca628e27f437b8003dc', `updated_at` = '2009-12-09 05:29:28' WHERE `id` = 29
[paperclip] Saving attachments.
[paperclip] saving /mnt/assets/3d_animals_11.jpg

Errno::EACCES (Permission denied - Permission denied - /tmp/3d_animals_11,12625,3937.jpg or /mnt/app/3d_animals_11.jpg):
/opt/jruby/lib/ruby/1.8/fileutils.rb:505:in `mv'
/opt/jruby/lib/ruby/1.8/fileutils.rb:1395:in `fu_each_src_dest'
/opt/jruby/lib/ruby/1.8/fileutils.rb:1411:in `fu_each_src_dest0'
/opt/jruby/lib/ruby/1.8/fileutils.rb:1393:in `fu_each_src_dest'
/opt/jruby/lib/ruby/1.8/fileutils.rb:494:in `mv'
app/controllers/users_controller.rb:72:in `upload_photo'
====================================================================================

FIX is :
vi rails/vendor/plugins/paperclip/lib/paperclip.rb

-----------------------------------
def flush_writes #:nodoc:
@queued_for_write.each do |style, file|
file.close
FileUtils.mkdir_p(File.dirname(path(style)))
log("saving #{path(style)}")
# FileUtils.mv(file.path, path(style)) # Comment out this
FileUtils.cp(file.path, path(style)) # add this two line
FileUtils.rm(file.path) # this too.
FileUtils.chmod(0644, path(style))
end
@queued_for_write = {}
end
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Its look like.

Its Worked for me. Cool.