Session facade deligator

Hi ALL,
I used to employ BusinessDelegate pattern in ejb 2.0. My design was SFD ( session facade deligator) ---- SFIMPL - DAO.
I am wondering whether it is still being used with ejb3.0. Besides providing abstraction layer to the session facade some of the benefits of using a delegate was to cache EJBHome, or to provide client with the byteCode for the serialized ejb Handles and to abstract ejb/rmi exception from the client code.
Is this pattern still applicable to ejb3.0 since now we don't use ejbHome, ejb/rmi exceptions are not visible and you have dependency injection. In ejb3.0 is the approach of serializing ebj handle still viable?
Also with struts is it better to create intsatnce of ejb interface in base action class and avoid any session facade deliagtor and call directly ejb imp
Thanks
Edited by: j2ee_expert on Jul 8, 2008 1:13 PM

You should avoid SessioCaching now and leave the job to the dependency injection. They are much more intelligent then what was possible before EJB 3.0.
For example they will avoid RMI if both applications are running on the same JVM, and take care of all the other stuff as caching and so on.
Bottomline: You wont need it in EJB 3.0 as dependency injection will take care of all the stuff the ResouceLocator/BD was doing.

Similar Messages

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    Error Code: 904
    Call:Select o from Trp_Sprojects o where o.project_id not in (2,1,4,5,12,14,15,16,17,18,20,6,7,8,9,10,11,13,22,19,3,26,21,23)
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    Error Code: 904
    oracle.oc4j.rmi.OracleRemoteException: Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2006.8 (Build 060829)): oracle.toplink.essentials.exceptions.DatabaseException
    Internal Exception: java.sql.SQLException: ORA-00904: "O": invalid identifier
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         at java.lang.Thread.run(Thread.java:595)Regards
    Lutchumaya

    Thanks for your help Frank.
    But when i display my query to be executed by the entityManager it is like that
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    Regards
    Lutchumaya

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    http://oi46.tinypic.com/10pqets.jpg
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    Edited by: 992005 on 05-Mar-2013 18:17

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    I understand the concept and the benefits of a
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