I'm building my first complicated EJB application and I've hit a problem to do
with declarative transaction settings. It's a subject that to date I've been
able to ignore - now I'm hoping somebody can help me with some general guidance.
I'm using the facade pattern where a stateless session bean masks access to
underlying CMP entity beans.
One of my more important session bean methods is a lengthy process that
involves multiple steps, each step will itself call one or more other stateless
session beans. Most of the calls to other stateless session beans are to
retrieve information, like 'getEntityX', 'findAllEntityY'.
Occasionally one of these retrieval calls will fail, (the underlying entity may
not exist). This is perculating up as a exception which triggers a transaction
roll back error in the main process, which is not what I want.
So it seems that I have to declare the transaction settings for each of the
retrieval related methods to avoid yes, right?
These leads to two general design questions on stateless session beans that act
as facades...
a). How to handle data not found situations.
If I have a session bean method like....
public EmployeeVO findEmployee(String anEmployeeCode);
... what should the method return if the employee does not exist. Should I
allow a EJBException to be thrown, or should the session bean method capture
the exception and return a null value object result. Both methods are possible,
I'm just wondering what is the more popular?
b). Declarative transactions for session bean methods
Should I by default make all session bean retrieval related methods have a 'not
supported' transaction setting?
TIA
...... davout
View the original post :
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3857795#3857795
Reply to the post :
http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3857795
-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://productguide.itmanagersjournal.com/
_______________________________________________
JBoss-user mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/jboss-user
