Re: [Springframework-developer] Replacing EBJs with Spring suggestions

[Michael E. M. <mm...@re...>]

Start by reading Rod Johnson's book on J2EE development without EJB.  
http://www.springframework.org/node/23
There are some merits for using EJB, but in almost every single case I 
have seen, you don't need them.

EJB Entity Beans (CMP) is a huge mess; don't use them.
EJB containers provide distributed transaction capability; a business 
transaction can span
multiple servers.. but I would try my very hardest not to introduce that 
kind of tight coupling.

I'm in the process of moving a Weblogic EJB application to Spring/Hibernate.
I'm almost done.
The new product is less than 1/2 the code size (including config files.. 
like the entity bean descriptors) and it runs about 40% faster. 
All business logic is located in classes that depend upon nothing but 
J2SE.. just
plain old java objects.. 
I can run/test the application stand alone, as a SOAP service, as an RMI 
service.. all I do is change a property file entry to do the switch.  I 
can emulate dowstream services (stup them out)
by swapping in a test stub in the Spring configuration.
I can do all my database persistence with a single graph of java objects.
Hibernate persists the graph according to my Spring transaction 
demarcations.

Just for the fun of it, I wrapped my business POJOs with Spring's EJB 
abstraction,
and deployed the application on JBoss.  NO PROBLEMS!!!



Garvey, Paul M (GE Commercial Finance) wrote:

>
>
>  
> Springers:
>
>              I need your thoughts on an architectual issue.  I have an 
> application running on a websphere app server that uses IIOP to 
> communicate
>
> with an EJB application running on another websphere instance on 
> another websphere app server. I want to replace the 2 application with 
> Spring.
>
> Any suggestions on how I can have 2 spring application communicating 
> with each other? They will remain on 2 separtate websphere instances on
>
> 2 separate app servers? I am new to Spring so bear with me. I need to 
> know what features in Spring allows me to replace my  controller 
> application
>
> to EJB application communication.
>
>
> -Paul
>