When I try to go to the definition of a java class from clojure I get:

; def (word): JsonSchema
; Can't open source, it's Java
; com/github/fge/jsonschema/main/JsonSchema.html

Would it be possible to get support for this? Or is it not feasable?

I couldn't find another issue referencing this feature or anything in the docs so I don't know your view on it.