In the below tutorial...
...the reference to the Groovy class, in the Java source file, is not recognized in the Java Editor, i.e., the below is underlined in red:
GreetingProvider provider = new GreetingProvider();
It used to be the case, in a NetBeans past, that that Groovy reference was recognized without a problem, and code completion worked too on the reference. Somehow somewhere something is now broken.