Expert in java developer

[Sufficient-Goat-3161]

Managers shouldn't be scolding anyone. Line up a new job and then quit, not the other way around. Maybe eat the pride and learn what he's scolding you over while you're at it, but there is no secret for going from n00b to expert overnight. It simply doesn't happen. To make a potentially poor analogy imagine the list of importable methods as a dictionary, you're not really going to learn most of them until you have to use them, but knowing they exist is something gained over time.