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

[Eugene K. <eu...@md...>]

Michael,

   It seems that your position is quite extreme. :-)

   I wouldn't say that CMP is a mess. There are use cases for CMP's, 
thet perform quite well and would provide transactionality and caching 
(especially in a clustered environment).

   Besides cross-server transactionality, J2EE appservers provide a 
good deal of clustering, connection pooling (JDBC, JMS, JCA), 
security, remoting (RMI-IOOP) and other common services that would be 
just sily to reinvent. I'd say it makes a lot of sense to use those 
services when adding Spring's value into existing J2EE/EJB-based 
applications.

   regards,
   Eugene


Michael E. Moores wrote:

> 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