Async evaluation broken for jupyter-julia Org blocks

[dangirsh]

I'm trying to run a block like this with a Julia 1.0.3 kernel on emacs-jupyter commit ea5ae74:

#+begin_src jupyter-julia :async yes
"Async" * "rocks"
#+end_src

I first hit this issue, so I set:

(add-hook 'ob-async-pre-execute-src-block-hook
          '(lambda ()
             (setq inferior-julia-program-name "/usr/local/bin/julia")))

Next, I hit a wrong-number-of-arguments error coming from the async process, which I manually traced to jupyter-repl-initialize-fontification. For some reason, the font-lock-defaults is nil in the child process's julia REPL buffer. This cascades to cl-destructuring-bind getting a nil argument, causing the error. Note, this doesn't happen for me with a Python 3 kernel.

I bypassed the fontification and re-executed the async request. Now I see the following:

Wrong type argument: jupyter-org-request, #s(jupyter-request "3bd5f75b-e8d4-4a7f-bdc7-040817931111" (23688 2124 987084 825000) nil nil nil nil)
Error running timer ‘jupyter-handle-message’: (error "Cell for request not found")

This also happens for the Python 3 kernel, making me suspect my setup (assuming it works for other people).

Aside: I'd also love to know how people debug async issues. I've been setting async-debug to get the transmitted sexp. I then manually run that sexp in a separate emacs process, which I launch like: emacs -Q -l /home/dan/.emacs.d/elpa/develop/async-20181224.454/async.el -f async-batch-invoke "<none>" (based on implementation of async-start).

[nnicandro]

I think you might be running into #32, emacs-jupyter doesn't use the ob-async package for communication, but ob-async also handles the :async argument which seems to interfere with emacs-jupyter. The fix is to set ob-async-no-async-languages-alist to exclude emacs-jupyter. Should probably add a note about this in the README...

[dangirsh]

Yup, fixed with:

(setq ob-async-no-async-languages-alist '("jupyter-julia" "jupyter-python"))

AWESOME