I pay out of my own pocket for Intellij, in case I want to build something that could make money and because contemporary Java is pretty ergonomic and suitable for some prototyping.

But I also maintain a vim config for Java development, because in small projects and some small fixes it has a nicer integration with the shell and cli tools there. If you aren't going to do JavaFX, hairy debugging or non-trivial release management it's good enough.