Re: Issue 5801: Handle Validation Groups

Dear Jens,

yes you are fully right. Validation is performed at the moment when persistence provider is called. ServiceLayerDecorator.validate() method was a bad choice. OK so far.
I get the ConstraintViolationException and i forward it to my CustomRequestFactory.

The code is similar to this:
http://cleancodematters.com/2011/05/29/improved-exceptionhandling-with-gwts-requestfactory/

Since it is an exception, the ExceptionHandler method createServerFailure(Throwable throwable) gets called. I can also check if it is a ConstraintViolationException.

So now:
How do I propagate ConstraintViolationException from my CustomRequestFactory correctly to the client so that Receiver.onConstraintViolation() is called on the client?

Thank you in advance:

Nermin



Am Donnerstag, 1. August 2013 18:09:09 UTC+2 schrieb Jens:

Pre persist validation are handled by your persistence provider on the fly whenever you try to persist an entity. The downside is that your persistence provider will probably throw exceptions if validation fails which causes RequestFactory to call Receiver.onFailure() on the client because your server side service method throws an unexpected exception now.

I think there is no viable solution for pre-persist validation. You could probably modify RequestFactory on server side and let it catch any ConstraintViolationException during the service method invocation phase and then propagate them correctly to the client so that Receiver.onConstraintViolation() is called on the client. To do so you would need to copy RequestFactoryServlet and SimpleRequestProcessor from the GWT SDK into your project and patch them to your needs.

Not sure if there are other ways to solve this.

-- J.

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