DAO depends on DAO but different implementation

hi everybody!
i have a problem in my application design ....
I use DAO-Pattern to access objects which are persisted. my DAOs offers some common CRUD-operations. the bussiness-logic (session-handling, transaction-logic) is enculapsed in command-pattern. for the reason that the session-handling and transaction-logic depends on the underlying DAO implementation (transaction-handling hibernate is different to jdbc) there is a implementation dependency between DAOs and Command .... so we have the following structure ...
     DAO...
          User (create,read,update,delete)
          Groups(.....)
          Protocol(....)
     Command...
          UserAdd: start session / transaction ... user-create group-read protocol-create
--- Implementations
     DAO:
          UserHibernate
          GroupsHibernate
          Protocol-Filebased
     Command:
          UserAddHibernateproblem is, that user and groups use a hibernate-implementation and protocol a file-based implementation ... so there are mixed DAO-Implementations in the AddUserCommand.
how can i clean seperate the two implemenations from the other in the commands? because i don't wan't to have a hard-coded dependency to the file-based-protocol in the hibernate-user implementation.
my solution would be to give the user-add command an attribute protocol-dao and call only the attribute in the UserAddHibernateCommand.
but i am not very happy with this solution ... is there any better way?
i hope you understand my problem(due to my bad english gg) and you can help me.

Bill,
This is a bug in the formEditor.vm template. The editor item is not set up to be a dependent item, you can fix this by adding the #ITEM_PARTIAL_TRIGGERS() macro to the <af:panelLabelAndMessage> element:
<af:panelLabelAndMessage #ITEM_PROMPT_IN_FORM() #ITEM_RENDERED_IN_FORM()
#ITEM_PARTIAL_TRIGGERS()
Also, not that you might want to extend your expression to check for '', in addition to null, ADF Faces sometimes returns false when checkinf for an item being null,a and the checking for '' returns true.
Steven Davelaar,
JHeadstart Team.

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