[jboss-user] [EJB 3.0] - Re: Newbie: how to interface EJB code with external librarie

[itsme]

Well let's try to answer that.

Think of EJB's as a facade in front of any complex functionality that should be executed remote and/or local with transactions and in a multi user environment. Stateless and stateful session beans are doing something for you while entities (pre EJB 3.0 entity beans) are business object which (mostly) get stored into a database.

So for example you can write a (stateful) session bean that manages the login and logoff off users. So here is the (at least for me) very simple hint for using EJB's: Keep things simple. Each ejb must have its own clear context.

For transactions (I think transactions are important for a trade system) there is nothing to do. You get them right out of the box if you're using container managed transactions.

For the ui by using jsf I personally prefer having one backing bean for one screen (i.e. login/logoff-ui). This backing bean can delegate its work to a ejb (that login facade mentioned above).

To concluse I would recommend to analyse the system carefully and do design the new app by using a combination of JSF and EJB.

Hope this helps in a way.
Regards
\sandor\

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