I've written a lot of Clojure now, and I've managed to avoided learning any Java really.

That’s a reassuring thing to hear as a new clojure learner who has little interest in java.

What bits of java have you ended up needing? Like do you often use java libraries that don’t have clojure wrappers?

I feel like I’m often running up against little things. I’ll google “how to do xyz in clojure” and the top SO answer is to use a java library that apparently everybody already knows about, cause so many clojurists came from java first!