With current 9.0.5 org-plus-contrib package, ob-clojure is broken and
trying to evaluate clojure source blocks just gives a code block produces
no output message.

The problem is in the org-babel-execute:clojure function. This function has
the following bit of code

(setq result
       (nrepl-dict-get
    (nrepl-sync-request:eval
     expanded (cider-current-connection) (cider-current-session))
    (if (or (member "output" result-params)
        (member "pp" result-params))
        "out"
      "value")))

The problem is in the call to nrepl-sync-request:eval. The documentation
states for this function

(nrepl-sync-request:eval INPUT CONNECTION &optional NS)

Send the INPUT to the nREPL server synchronously. The request is dispatched
via CONNECTION. If NS is non-nil, include it in the request.
Note the last optional argument NS. This is supposed to be a clojure
namespace. However, the org-babel-execute:clojure function is calling this
function with the output from cider-current-session, which returns a unique
ID representing the current session. As a result, the call is returning a
data structure with an error and no output (perhaps some error handling is
required). The returned result is

(dict status (namespace-not-found done error done state state) id 17
session 43e9fd6c-82ed-49fe-9624-0cfc6f56f8b1 changed-namespaces (dict)
repl-type cljclj)

Note the namespace-not-found

Either the argument should be a call to (cider-current-ns) or perhaps it
should just be left out as I don't see how you can pass the namespace as
part of the block evaluation.


-- 
regards,

Tim

--
Tim Cross