One big difference is that Java APIs tend to require the collaboration of various class instances to get something done, things that you would implement as a single function + options object on your own.
Bouncy Castle is a good example. You may need a Hasher, HasherStrategy, ASNEncoder, DERParameters, and ASNSerializerStrategy instances to execute what you would've implement as `(asn-encode thing)` otherwise, maybe even having to subclass some of them to change some behavior you'd expect an option flag for.
Clojure's own Java-helper macros will compact your 1:1 Java interop code as well, so you have fewer lines even when writing Java from Clojure. Also, short-cuts like ad-hoc reification in Clojure will spare you LoC where you might otherwise have created a whole file for a class with custom interface implementation in Java.
Of course, line-to-line code is also just more compact in Clojure, but ecosystem/api difference is one I don't see mentioned as often.
I don't think this is just good vs bad, though. There are certainly upsides to the more rigid everything-in-its-right-place code you tend to have in Java which has been making big strides in improving itself over the past decade.