IDEA cannot infer types of autowired beans in grails 3 app

Hi!

A few details:
I'm using grails 3 (3.0.14) and IDEA 15.0.3. Source code is, for example:
```
class BootStrap {
def cardService
def init = { servletContext ->
cardService.importAllCards()
}
}
```
A long time ago in a galaxy far far away, IDEA was handling that perfectly. I used grails 2 and IDEA 14 during these happy days. What do I mean by saying "perfectly"? Well, I could hover mouse to the "cardService" word and click Ctrl, and then I would see it's "CardService" class. I also seen a green leaf near the "def cardService". Now I see "private def cardService" and "Cannot infer type". I was able to Ctrl+Click the "importAllCards" and see the source code of that method. Right now it's impossible, too.

It works fairly well when I use
```
class BootStrap {
@Autowired
CardService cardService
def init = { servletContext ->
cardService.importAllCards()
}
}
```
But I just think Grails support can be improved.
Controllers and services share the same behaviour.

---

*Imported from [IDEA-151571](https://youtrack.jetbrains.com/issue/IDEA-151571) · Type: Bug · Votes: 0*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Start by reproducing the issue in the Grails 3.0.14 and IDEA 15.0.3 setup using the BootStrap example, then compare unannotated and @Autowired CardService fields. Check whether type inference and Ctrl+Click navigation work for injected services in BootStrap, controllers, and services; done means the unannotated form resolves the service type and method source.

Written by the indexing model from the issue text.