Hangs caching JVM class names

[mjwillson]

I've noticed lengthy slowdowns before while ac-nrepl is 'caching JVM class names', but recently found a show-stopper where this hangs indefinitely (I just left it overnight) after adding "(use 'clj-stacktrace.repl)" to :repl-options :init in my .lein/profiles.clj.

Not sure whether this is ac-nrepl's fault or clj-stacktraces (so I opened https://github.com/mmcgrana/clj-stacktrace/issues/18 too), but in general it might be good to put some kind of timeout or limits on this caching business, or do it in a separate thread (no idea if this is possible!) since it seems to block the emacs UI pretty severely with a killall emacs24 being the only way I found to interrupt it.

(If it's doing something recursive, perhaps it needs some recursion depth limit or cycle avoidance logic?)

[purcell]

Strange indeed. There's no recursion going on, and this step usually completes in just a few seconds, even with a pretty full classpath. When I get chance, I'll see if I can duplicate this, but I'm a bit snowed under right now. :-/

[mjwillson]

Huh, strange. Cheers for the input anyway. Let me know if there's anything I can do to instrument the code and see what's going on -- at present I have to restart emacs though.

[purcell]

Okay, so I added the clj-stacktrace snippet to my profiles.clj, and I still can't reproduce the error. Are you using the snippet currently described at https://github.com/mmcgrana/clj-stacktrace ? The version of that snippet for Lein 2.x doesn't include (use 'clj-stacktrace.repl), so maybe you need to update that in your profiles.clj?

-Steve

[purcell]

@mjwillson Can you confirm if that was the issue?

[mjwillson]

I'm using the injections snippet from those docs but also (use 'clj-stacktrace.repl), because I wanted to have the modified pst/print-stack-trace etc available from the REPL, but their snippet just re-binds it within the clojure.stracktrace namespace.

Apologies if this is a fiddly one to track down, I've disabled the snippet for now to get some work done, but if I get time I'll poke around a bit more. Perhaps it's a bug in complete.core, in fact, since it seems you're just calling through to that.

[vemv]

So I'm experiencing this issue too - emacs freezes when ac-nrepl tries to cache JVM names. I should note that I just upgraded from an old version emacs24 snapshot (the last one available for ubuntu 10.10) to a very recent one (that included with ubuntu 13.04 beta).

It only happens when using my complete emacs setup which uses a fair amount of plugins, config etc. With this absolute minimal setup for Clojure, the issue disappears.

@mjwillson, perhaps you'd be interested in trying to reproduce the issue using the minimal setup I provided (or an equivalent one) + your profiles.clj.

[vemv]

Using an emacs snapshot rather than the version provided by ubuntu 13.04 solved the issue for me.

[purcell]

I wanted to note here that it seems there was an auto-complete issue (auto-complete/auto-complete#153) which caused similar hanging issues with EDTS (an Erlang helper mode with a similar socket-based backend process): the related comments at the end of the EDTS README sound very familiar...

-Steve

[MalloZup]

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