Java Interop - unable to instantiate java.util.HashSet

Programming Clojure
1

Greetings,

I wish to confirm whether there exists a configuration limitation in the Clojure online test runner that prevents the use of Java classes, specifically the one mentioned in the title ?

My code executes on Clojure online platforms such as OneCompiler, but not under the Exercism online test runner (no, I do not have a local Clojure installation available).

The offending snippet:

(def +generated-names+ (new java.util.HashSet))

The corresponding test runner output:

----- Error --------------------------------------------------------------------
Type:     clojure.lang.ExceptionInfo
Message:  Unable to resolve classname: java.util.HashSet
Data:     {:type :sci/error, :line 11, :column 1, :file "/mnt/exercism-iteration/src/robot_name.clj", :phase "analysis"}
Location: /mnt/exercism-iteration/src/robot_name.clj:11:24
Phase:    analysis

----- Context ------------------------------------------------------------------
 7:   (:gen-class))
 8: 
 9: (declare make-robot) 
10: 
11: (def +generated-names+ (new java.util.HashSet))
                           ^--- Unable to resolve classname: java.util.HashSet
12:

I have no problem using other approaches to solve the exercise. I merely want to know why this particular Java interop is not working.

Thank you.

2

That’s because the interpreter used on exercism is babashka. It comes with limited functionality.

Here’s what you need to know:
https://github.com/babashka/babashka#goals
https://github.com/babashka/babashka#differences-with-clojure

3

Yes, that clears that mystery up !

I thought it might be a configuration issue, but did not delve because I’m trying to complete the remaining 12In23 exercises before the deadline.

Thank you, very much, for your help.