Support non String types with the property override feature

I almost have the solution for this, just need a way of dealing with proxied objects. Since most services are transactional proxies, we need to transparently set the property on the underlying service instead of the proxy itself.

Added in http://github.com/grails/grails/commit/eb7100d36c76be4d7461d8a8a76546c6ff30e686

Docs need updating.

Docs: http://github.com/grails/grails/commit/d195ff3d82eed1c24bda4d4eb5cad59e84b5417a

Cool feature, thanks.

I looked at the implementation and was wondering the complex getTargetBeanDefinition logic. In Spring's PropertyOverrideConfigurer it's done like this:

		BeanDefinition bd = factory.getBeanDefinition(beanName);
		while (bd.getOriginatingBeanDefinition() != null) {
			bd = bd.getOriginatingBeanDefinition();
		}

See http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/beans/factory/config/BeanDefinition.html#getOriginatingBeanDefinition%28%29

The docs for getOriginatingBeanDefinition() are rather vague. I am not really sure what it will do.

I think it does the same thing as your code, but in a generic way. Spring's PropertyOverrideConfigurer is also using it.
In the original Spring commit message it says 'added "getOriginatingBeanDefinition()" method to BeanDefinition interface, exposing the decorated definition (if any)'.
Do you have some tests to confirm the behaviour?

There are tests: http://github.com/grails/grails/commit/eb7100d36c76be4d7461d8a8a76546c6ff30e686#diff-3

I'll try it out.