Hi,
I am designing persistent layer for one of Poc, and I have the following architecture in place.
JSP is used as rendering/presentation (Here I will have Value Object), and control goes to servlet where I am Invoking EJB method calls. so the entire Value object will be passed to ejb layer. Now during the insertions into the database using hibernate, can I use the same value object to insert into the database or do I need to create separate POJO (infact they are value objects only) and have a wrapper for value object to convert it to POJO. So that I will be differentiating value objects and object (data) model. Suggest me some principles here..
Thanks in advance.
Regards
Nagesh G

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If you are colocating your web and ejb tiers in the same JVM (which is a *good* idea, in general), you don't need no stinkin' "value" objects.
Use the OSIV (Open Session In View) pattern with a servlet filter and let your JSPs use the Hibernate POJOs while rendering the view.
More on this can be found on the hibernate website, i.e. here (search is your friend); better still, buy the Hibernate In Action book for excellent advice on architecture among other things...
HTH
Satish