The issue is that there are successful people who can all those at the same time. Unfortunately, it requires a lot of study and varied experience. A newcomer can become passable Java developer within realistic timescales, but will require years of experience to be able to contribute at an organization that expects him to perform all those roles.
I have 20 years of experience in IT, 7 as admin (ops), 13 in development. I still spend over half my time on purposeful learning and sometimes find mysef out of depth, catching breath. I don't envy noobs who will have little chance catching up.
Most of the time I hear devops it in reality is a person doing hopefully good job in one area and passable in another and relying heavily on others for everything else.
I have 20 years of experience in IT, 7 as admin (ops), 13 in development. I still spend over half my time on purposeful learning and sometimes find mysef out of depth, catching breath. I don't envy noobs who will have little chance catching up.
Most of the time I hear devops it in reality is a person doing hopefully good job in one area and passable in another and relying heavily on others for everything else.