Product Version = NetBeans IDE Dev (Build 201512010002)
Operating System = Windows 8 version 6.2 running on amd64
Java; VM; Vendor = 1.8.0_51
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.51-b03

Reproducibility: Happens every time

STEPS:
1. Make a Maven Web project (I think it doesn't matter what kind of Java project is)
2. Make a class called Links with the following content:
public class Links {
    
    public static final String USER = "/user";
    public static final String USER_DETAILS = USER + "/details";
    
}
3. Make a class called MyServlet with the following content:
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;

@WebServlet(Links.USER_DETAILS)
public class MyServlet extends HttpServlet {
    
}
4. Put the mouse cursor after "Links.U" (inside the annotation of the previous class)
5.A. Press CTRL+Space where the cursor is
5.B. Press CTRL+Click on "USER_DETAILS" or "Links" (inside the annotation of the previous class)

ACTUAL:
  5.A. Shows "No suggestions" instead of the 2 available options that should have been shown as auto-complete suggestions: USER and USER_DETAILS.
  5.B. Opens the annotation interface WebServlet instead of the class Links at USER_DETAILS

This issue is very recent. It used to work properly until a few weeks ago.
It is very disturbing, as auto-complete and CTRL+Click are 2 features that I use frequently during development, but now they don't work anymore as they should.
Thank you. :