println in fiber: java.lang.IllegalArgumentException: wrong number of arguments

[dehubbed]

Just starting out with pulsar (0.6.2), maybe I'm doing something wrong, but

(ns borked
  (:require [co.paralleluniverse.pulsar.core :as p]))

(p/spawn-fiber (fn [] (println "test")))

results in

Exception in Fiber "fiber-10000002" java.lang.IllegalArgumentException: wrong number of arguments
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93)
    at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:28)
    at clojure.tools.nrepl.middleware.session$session_out$fn__1390.doInvoke(session.clj:41)
    at clojure.lang.RestFn.invoke(RestFn.java:460)
    at clojure.tools.nrepl.middleware.session.proxy$java.io.Writer$ff19274a.write(Unknown Source)
    at java.io.PrintWriter.write(PrintWriter.java:456)
    at java.io.PrintWriter.write(PrintWriter.java:473)
    at clojure.core$fn__5471.invoke(core_print.clj:191)
    at clojure.lang.MultiFn.invoke(MultiFn.java:231)
    at clojure.core$pr_on.invoke(core.clj:3392)
    at clojure.core$pr.invoke(core.clj:3404)
    at clojure.lang.AFn.applyToHelper(AFn.java:154)
    at clojure.lang.RestFn.applyTo(RestFn.java:132)
    at clojure.core$apply.invoke(core.clj:624)
    at clojure.core$prn.doInvoke(core.clj:3437)
    at clojure.lang.RestFn.applyTo(RestFn.java:137)
    at clojure.core$apply.invoke(core.clj:624)
    at clojure.core$println.doInvoke(core.clj:3457)
    at clojure.lang.RestFn.invoke(RestFn.java:408)
    at borked$eval2177$fn__2178.invoke(NO_SOURCE_FILE:1)
    at co.paralleluniverse.pulsar.InstrumentedIFn.invoke(InstrumentedIFn.java:32)
    at co.paralleluniverse.pulsar.ClojureHelper.suspendableInvoke(ClojureHelper.java:185)
    at co.paralleluniverse.pulsar.ClojureHelper$3.run(ClojureHelper.java:172)
    at co.paralleluniverse.fibers.Fiber.run(Fiber.java:1003)

[dehubbed]

The above only happens in nrepl (via Eclipse). Seems nrepl is somehow getting in the way. Strange. Someone had a similar problem: https://groups.google.com/forum/#!topic/quasar-pulsar-user/TkgWpuIiI80

However can't just blame it on nrepl, it all works with "future-call" instead of spawn-fiber.

[circlespainter]

Yes, I just tried with a lein run (with a main method) and lein repl and they work ok. Not an expert of nrepl w/ Eclipse, is the Quasar agent running ok? If everything seems regular, could you please try 0.6.3-SNAPSHOT as well?

[dehubbed]

sure give me 1 hr

[dehubbed]

0.6.3-SNAPSHOT is not on clojars, is it? should I clone the repo and build it?

[dehubbed]

ok I cloned & compiled, same issue. I or anyone can make do without the Eclipse nrepl for sure, however it is a bit worrying that there should be subtle interactions like that.

[dehubbed]

using clojure.tools.logging (via slf4j and log4j) and doing (debug "test") instead of (println "test") works. even though debug uses println somewhere down in its guts. ah well.

[circlespainter]

I just installed Eclipse Luna for Java + CCW and I'm trying hard to reproduce it but I'm not able to, maybe I'm doing something wrong.

I'm on JDK 1.8.0_25, Mac OS X Yosemite, I tried creating a Leiningen project with Quasar/Pulsar setup, then I right-clicked it and "Leiningen/Launch Headless REPL for the project", finally in the REPL I pasted your snippet but I get "nil" as a return value and "test" in stdout without any exceptions.

Should I do something else?

[dehubbed]

I'm on Ubuntu JDK 1.7. I don't have a Mac here but I can try JDK 1.8 later today.

[dehubbed]

Just tried JDK 8, same thing. No idea how to reproduce this any other way. I think you can close this issue. I could reopen it should I come across further clues.

[circlespainter]

Are the steps I'm following to reproduce it right? Are you doing the same things?

[dehubbed]

Yes, the step are right and you are doing the same thing, other than my OS being Ubuntu which should hardly matter. Counterclockwise version is 0.31.1?

Can I send you a tgz file somehow with my bare bones Eclipse project in it that you can run unzip and run?

[dehubbed]

File here: https://mega.co.nz/#!us8gFLBB!1CQ7JOp8F1HEoyOVJI2dM4AsRMMSgRSjPtT9-zAfrU4

[dehubbed]

There is an Eclipse launch configuration in that package, that's what I use to launch it.

[circlespainter]

Thanks, I'll have a look ASAP.

[circlespainter]

Yes, CCW is 0.31.1.STABLE001. Tried with your project and launch config (I adjusted just the path to Quasar's agent to use my home), connected to it with lein repl :connect, copied and pasted your borked.clj test content and still I get no exception. Have you got a chance to try on some other machine / setup?

[dehubbed]

Will do.

[dehubbed]

Yes I tried a different machine and everything works completely fine. Up to me now to figure out what the crucial difference is! =8-O I'll keep you posted.

[dehubbed]

btw related to this? https://github.com/puniverse/pulsar/issues/29

[circlespainter]

I won't rule it out completely but I think it's unlikely as that issue was reproducible everywhere, every time and you're trying (or have tried already) with pulsar 0.6.3 which contains a fix for it.

[circlespainter]

I'll close it for now, if more info will be available about reproducing it we can always reopen it.