Can't Jack-In to new Luminus template (+re-frame +shadow-cljs).

[dfehrenbach]

Referring to https://calva.io/luminus/, it seems very straight forward, but I'm getting an odd error.

ERROR: Unhandled REPL handler exception processing message {:op eval, :code *ns*, :id 1}
Syntax error compiling at (cider/nrepl/inlined_deps/orchard/v0v6v0/orchard/java/legacy_parser.clj:1:1).

running:
lein update-in :dependencies conj '[nrepl"0.6.0"]' -- update-in :dependencies conj '[clj-kondo"2020.04.05"]' -- update-in :dependencies conj '[cider/cider-nrepl"0.23.0"]' -- update-in :plugins conj '[cider/cider-nrepl"0.23.0"]' -- update-in '[:repl-options :nrepl-middleware]' conj '["cider.nrepl/cider-middleware"]' -- with-profile +dev shadow watch app test

by itself works without issue, however, jacking in results in the above error.

Note: for reference, this Luminus project was created with the following command:
lein new luminus my-luminus-shadow +re-frame +shadow-cljs

[bpringe]

I've gone all the way back to 2.0.118 and it still doesn't work 🤔

[bpringe]

Oh... This seems to be related to the template using nrepl version 0.8.0: https://github.com/luminus-framework/luminus-template/blob/06bc88aeecbbfce7250cc5ec305439f38ae5c437/CHANGES.md#384

Calva uses nrepl 0.6.0 in jack-in and may require some code changes to work well with 0.8.0.

@PEZ I remember seeing something about this in slack somewhere... Do you think bumping Calva's nrepl version to 0.8.0 will require many changes? Seems this might be something we should do.

[bpringe]

@dfehrenbach For now you can change the nrepl version in the project.clj to 0.6.0 and it should work as far as I know (jack-in worked for me like that, at least).

[dfehrenbach]

@bpringe Thanks for the quick turn around! I'll be looking forward to calva using 0.8.0 for the nrepl 👍

[bpringe]

I've been investigating this and here are my findings thus far, for future reference:

Lein uses nrepl version 0.7.0. If a different version is included in project.clj deps, the different version will be used (this can be seen with lein classpath). If a different version is instead included via lein update-in :dependencies then lein will only use it if newer than its own version. So currently, any lein projects used with Calva's jack-in are actually using nrepl 0.7.0, unless they specify otherwise in their project.clj.

Calva should stay up to date with nrepl anyway, so we should update it in the jack-in task. Currently that seems to break jack-in, so fixing that is required.

[bpringe]

Found that it's a bug in nrepl 0.8.0! nrepl/nrepl#206

It was fixed in version 0.8.1.

Jack-in works fine in this case with nrepl 0.8.2 (latest as of right now). Fix coming soon.

[bpringe]

It appears the luminus template has been updated to include nrepl 0.8.1 already, so new projects generated shouldn't have this problem, but I'm going to bump Calva's jack-in nrepl version to 0.8.2 anyway, as it'll fix this issue with any projects that do use 0.8.0.

[bpringe]

Just to document here if anyone else has this issue - I was having this issue on a particular project since the above fix, and upgrading leiningen solved the issue.

Update: The issue came back. I can't consistently reproduce, but lein clean then jack-in seems to fix it, at least temporarily.