Narcissism is more of a spectrum of behavior than a bistable formalism, but it is mostly characterized by feeling superior in general (not only in J2EE) and that superiority not based on actually being better. Keep in mind that most deluded people do not recognize their delusion so the latter is less useful as a self-diagnostic criteria.

Here's an example, my city has a water-related emergency and so the water system is temporarily broken. Local coffee shops have closed because it's too difficult to access suitable water. Meanwhile I am drinking coffee right now, and feeling quite smug that as a rank amateur I can do what Those Who Had One Job cannot. I frequently have this experience where I feel like I can do things better than other people. This is a giant red flag for narcissism.

If you dig into it though, I can make coffee because I have a weeks worth of supplies on hand because I had a rough childhood and certain things stay with you. I have two ISPs in case one goes down (and actually chose where I live for that reason), I have at least four modes of transit to get most places, I just chronically overplan for everything in life all the time. So when something goes wrong I will have two or three solutions ready to go while a normal person is trying to stop panicking.

That is a symptom of something, namely my generalized anxiety of having to rely on other people. But whereas a narcissist will berate a new cashier for not knowing how the POS system works, I surreptitiously memorized the right buttons from the last time I was here, help them get through the transaction as quickly as possible and say that I used to work here so they don't feel too bad.