NB unexpected ambiguous symbol warnings

[Dawn Raison]

Hi folks,

I keep bumping into this type of issue in some of my netbeans projects. 
While everything compiles / runs OK, I get red exclamation marks against 
the code and the following hover over warnings:

reference to getRecipientContactStatusList is ambiguous
  both method getRecipientContactStatusList() in RecipientHolder and method 
getRecipientContactStatusList() in RecipientHolder match

reference to getMessageStats is ambiguous
  both method getMessageStats() in RecipientHolder and method getMessageStats() 
in RecipientHolder match
----
(Alt-Enter shows hints)

The code fragment in question looks like:

    public MessageResponseDto generateRecipientList(Term term, 
MessageRequestDto messageRequestDto) {

        RecipientHolder rh = 
messageRecipientListService.createRecipientList(term, messageRequestDto, 
MessageTarget.EMAIL);

        return new MessageResponseDto(rh.getRecipientContactStatusList(), 
rh.getMessageStats());

    }

This is just one example, over time more and more appear, until i close 
NB, delete the cache, and restart wherein it's OK for a "while" (can be 
days, or an hour).

If i do a CTRL-click on the symbol, NB is able to navigate directly to 
it - so it knows the "right answer".

I use LOMBOK extensively in this maven based project, which is composed 
of several modules.

Now, I'm intending to try debugging NB to see where this happens, can 
anyone make any suggestions as to where to start my investigations?

Thanks,

Dawn Raison