Re: Handling Violations controlled by groups or Violations not found by default validation

Thanks for your answer!

Well...propably I'm abusing bean validation (?), but in my case that doesn't help (actually I'm already doing it like this with different groups).

I'll try to explain my problem:

Basically I've got two validation groups which both should be run on the server-side: Client and Server

Client: These validators should be run when an object enters the server from the client (in the ServiceLayerDecorator)
Server: These validators should be run before persist / update etc happens (in my DAOs)

The reason why I separated it like this is that there are some class level constraints which may be violated when an object enters the server that should get corrected in the service method afterwards, but for safety be checked again before updating the database.

So far that works good and was pretty easy to implement:

ServiceLayerDecorator:

    @Override
    public <T> Set<ConstraintViolation<T>> validate(T domainObject) {
        return validator.validate(domainObject, Client.class);
    }

But ViolationExceptions occuring later are, as Michael already explained pretty well, reported as ServerFailures, not as ConstraintViolations -> non-resusable RequestContext, no error messages shown etc :-/

I already tried to copy/paste SimpleRequestProcessor & RequestFactoryServlet (into com.google... package structure) to change it to my needs. I have to admit though that I couldn't figure out how to catch all exceptions and not handle ConstraintViolationExceptions as server failures. I would already be happy with that although it feels a bit hacky :)!

Am Dienstag, 21. Mai 2013 14:58:32 UTC+2 schrieb Jens:

By default, GWT calls validator.validate(domain) in ReflectiveServiceLayer.validate(), but you probably want 

if(domain.getId() == null) {

  return validator.validate(domain, CreateGroup.class);

}

return validator.validate(domain, Server/DefaultGroup.class);

You can do this by providing a custom ServiceLayerDecorator to RequestFactoryServlet and implement ServiceLayerDecorator.validate(T domain) accordingly.

-- J.

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