Re: Fundamental flaw in Model-Driven?

[Chase]

Adam Hardy wrote:

the problem was spurious JPA updates - which can be avoided by putting 
an interceptor in between the Validation and the Workflow 
interceptors: all it should do is call EntityManager.clear().

if (validationAwareAction.hasErrors()) getEntityManager().clear();


Using the JPA extended persistence context (not EJB), the clear() will 
eliminate any changes to the model before JPA comes to flush to the 
db. I assume it would work in an EJB container too.

Does that fit your situation, Eric?
Then wouldn't the following work?

   public void validate() {
       //any actual validation code here
      
       if(hasErrors()) {
           //clear EntityManager or fail transaction
       }
   }



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