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EJB - Struts - MVC

Posted on 2006-07-16
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Hi Guys,

I'm in the initial stages of learning EJBs and Struts.

My question is - When I say ....I'm using Struts in a Project it means i'm using MVC model-2. And in the same project can I use EJB's . If Yes, can you explain in terms of using Struts and EJBs combinely.


Thank You,
Jagadeesh
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Question by:jagadeesh_motamarri
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suprapto45 earned 125 total points
ID: 17119409
Hi,

If you would like to combine both EJB and Struts together, here is what we normally do.

Struts will only manage the flow of the application as well as doing all the validation to and from JSP. JSP interacts with Struts. Then Struts action will call the method in the session bean to do all the business logic. Normally, business logics are located in session bean and not in the Struts.

David
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by:mukundha_expert
ID: 17119756
then EJB is your controller
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by:girionis
girionis earned 125 total points
ID: 17120055
jagadeesh_motamarri,
> I'm using Struts in a Project it means i'm using MVC model-2. And in
> the same project can I use EJB's . If Yes, can you explain in terms of
> using Struts and EJBs combinely.

Yes you can use EJBs in the same project. JSPs via Struts will be there for the View (i.e. for displaying the data to the user), EJB and struts action classes will be the controller (i.e. will be loading the data from the database and will do the appropriate actions, e.g. calculate things etc) and the data in the database will be the Model. You will need to be calling EJBs from your JSP pages.
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by:Meritor
Meritor earned 125 total points
ID: 17122674
>Yes you can use EJBs in the same project. JSPs via Struts will be there for the View (i.e. for
>displaying the data to the user), EJB and struts action classes will be the controller (i.e. will
>be loading the data from the database and will do the appropriate actions, e.g. calculate
>things etc) and the data in the database will be the Model. You will need to be calling EJBs
>from your JSP pages.

You have suggested to make EJBs as Controller and call them through JSP that is not a good practice.
Generally, only business logic should be written in EJB.
Only Struts ActionServlets and struts-config.xml should only be the controller.
And your Action classes should call EJB which contains the core business Logic.
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by:girionis
ID: 17122729
Actually no. I have suggested to use EJBs *and* Struts actions as controller :)

But I will agree with you, it's not a good practice to call EJBs straight from JSP, although nothing prevents you of doing so.
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by:Mayank S
ID: 17129880
http://java.sun.com/blueprints/guidelines/designing_ enterprise_applications_2e/web-tier/web-tier5.html
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by:Mayank S
Mayank S earned 125 total points
ID: 17129885
Oops :) java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/web-tier/web-tier5.html
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