netface | Returns your external facing IPv4 addresses using nodejs | Runtime Evironment library

I had a little program that relied on getting some information from the local Network Interfaces. Then, I needed to add some functionality, which needed that information again. I didn't want to touch my tested and highly used methods. So, under the pressure of time, I decided to reuse the method, effectively translating the NetworkInterface Enumeration into an ArrayList twice (not my proudest coding moment!).

Upon testing, I noticed it doesn't really work!

Sequence of actions:

1. I grab the NetworkInterface Enumeration from the OS once, into a class field
2. myMethod translates the NetworkInterface Enumeration into an ArrayList, does some analysis and returns some information, to do something
3. myMethod translates the NetworkInterface Enumeration into an ArrayList, does some analysis and returns some information, to do something else

I notice, on the second translation, the result was zero! In debug, I notice that my Enumeration has a field "i". That field: first time, it equaled 55 (the count of my IFs), second time, it equaled 0...

I provide a small piece of code that should reproduce it for your debugging pleasure (I am using Java 8):