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From Andrus Adamchik <>
Subject Re: Web application with no access to database
Date Thu, 10 Aug 2006 13:45:30 GMT
Hi Borut,

(2) is essentially the same as (3), only this is a case of  
"unsupported remoting", in that it works in theory, but hasn't been  
tested much to iron out any possible wrinkles.


On Aug 8, 2006, at 4:51 PM, Borut BolĨina wrote:
> Hello,
> me again troubling you...
> I just read the
> +Persistence+Guidein
> search of the solution. If someone read my posting about "Database
> replication and caching" this is the continuation of the architectural
> question.
> Two or more web applications will collect data from users and  
> obviously
> should be persisted in database. Those web apps will communicate with
> backend java applications (cluster) via RMI calls for some other  
> reasons.
> Collected web data represent two Cayenne data objects (one is in  
> the to-one
> relationship with the other). If we don't want the web apps to have  
> direct
> access to database, this two objects should be passed to backend  
> Cayenne
> enabled java application to persist them. As I read the thread
> 2005/09/0205.html I am
> not sure what would be the best approach to take for my case
> (entity1----toOne--->entity2). Should I
>   - make two value objects (those would be to plain serializable  
> beans?)
>   and pass them via RMI call to backend java application to connect  
> them and
>   persist them, or
>   - create DataContext, insert those to CayenneDataObjects into it,
>   serialize DataContext and send it over the RMI to backend java  
> application
>   just to commitChanges on received deserialized DataContext, or
>   - set up Hessian web service on backend machines to receive requests
>   from frontend (web applications) to persist data, or
>   - not bother with Cayenne at all on the frontend (web apps) and send
>   array of user entered values to backend java application to  
> construct
>   Cayenne data objects out of the data and then persist them.
> Option two seems most appealing to me, but the last one I think is  
> the least
> work, although not as elegant. What do you think?
> Regards,
> Borut

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