IIRC I've seen people report this when they add Clojure sources to their classpath along with the jar. But maybe that's not it in this case.

Encountered it here: https://github.com/FieryCod/holy-lambda/issues/26

The error occurs when using clojure >= 1.10.0 only on java11

Hard to say exactly, but my guess is it is some kind of aot related issue. This is kind of hard to wade through (for example the source for the lein plugin doesn't seem to be the repo?) but we can discount the existence of an actual cyclic dependency in clojure. My guess is an aot issue, just because it often is, but I can't recall an aot issue presenting as a cyclic dependency. The repo looks like it is library code, but is also marked to aot compile everything when building an uberjar. Both of which are big red flags with library code. Library code should not be uberjared or aot compiled.

Thanks @U0NCTKEV8! Will check whether removal of aot helps

@U0NCTKEV8 Removed aot compile for library. Allowed aot compilation for hello-lambda code. Still the same errors is there. Maybe Alex would know the answer? EDIT: When trying clojure:1.10.0 (removing require of clojure.walk) and compiling on java8, but still running on java11 the error is different:

Caused by: Syntax error macroexpanding clojure.core/defn at (clojure/spec/alpha.clj:78:1).
	at clojure.lang.Compiler.checkSpecs(Compiler.java:6972)
	at clojure.lang.Compiler.macroexpand1(Compiler.java:6988)
	at clojure.lang.Compiler.macroexpand(Compiler.java:7075)
	at clojure.lang.Compiler.eval(Compiler.java:7161)
	at clojure.lang.Compiler.load(Compiler.java:7636)
	at clojure.lang.RT.loadResourceScript(RT.java:381)
	at clojure.lang.RT.loadResourceScript(RT.java:372)
	at clojure.lang.RT.load(RT.java:459)
	at clojure.lang.RT.load(RT.java:424)
	at clojure.core$load$fn__6839.invoke(core.clj:6126)
	at clojure.core$load.invokeStatic(core.clj:6125)
	at clojure.core$load.doInvoke(core.clj:6109)
	at clojure.lang.RestFn.invoke(RestFn.java:408)
	at clojure.core$load_one.invokeStatic(core.clj:5908)
	at clojure.core$load_one.invoke(core.clj:5903)
	at clojure.core$load_lib$fn__6780.invoke(core.clj:5948)
	at clojure.core$load_lib.invokeStatic(core.clj:5947)
	at clojure.core$load_lib.doInvoke(core.clj:5928)
	at clojure.lang.RestFn.applyTo(RestFn.java:142)
	at clojure.core$apply.invokeStatic(core.clj:667)
	at clojure.core$load_libs.invokeStatic(core.clj:5985)
	at clojure.core$load_libs.doInvoke(core.clj:5969)
	at clojure.lang.RestFn.applyTo(RestFn.java:137)
	at clojure.core$apply.invokeStatic(core.clj:667)
	at clojure.core$require.invokeStatic(core.clj:6007)
	at clojure.main$loading__6721__auto____8974.invoke(main.clj:11)
	at clojure.main__init.load(Unknown Source)
	at clojure.main__init.<clinit>(Unknown Source)
	... 58 more
Caused by: java.lang.Exception: #object[clojure.spec.alpha$and_spec_impl$reify__2387 0x69d45cca "clojure.spec.alpha$and_spec_impl$reify__2387@69d45cca"] is not a fn, expected predicate fn

I bumped into this with Figwheel. It culprit was cljc dir in the target dir, ie twice. Once in src/ and the second in target/.

lein clean often helps @UJ1339K2B

Hi @seancorfield. Thank you for an advice! Unfortunately it does not help either. Moved with discussion to this thread https://clojurians.slack.com/archives/C1B1BB2Q3/p1609759205028100

should have rtm :) https://github.com/AdoptOpenJDK/homebrew-openjdk/tree/463eb266789e9e45b4a444923877861a4068c64d#switch-between-different-jdk-versions

I have a bunch of env vars set in my .profile so I can easily specify JAVA_HOME=$OPEN_JDK<n> at the start of any command to run whatever version I need for that command.

(I have 8, 11, 14, 15 installed right now)

Deref and realized https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Delay.java to https://docs.oracle.com/javase/tutorial/essential/concurrency/syncmeth.html methods.

> When one thread is executing a synchronized method for an object, all other threads that invoke synchronized methods for the same object block (suspend execution) until the first thread is done with the object.

I think it's at least partly to avoid Shrodinger stuff: a delay is either pending or ready -- you can't observe it "getting ready"

hmm ok. In my current design I've got a time-consuming task which several threads might be waiting for, so I put it in a delay, but I guess that's not what delay is meant for, since clojure code is supposed to avoid locking. I guess I need to re-think it.

You probably want to check .isDone on the future

Well, you can't use a value until it is available. What do those other threads do if the value is not available (yet)? If they simply spin and wait for it, why not have them just use a deref and block? If they have other work to do, use a future instead of a delay perhaps? realized? doesn't block on a future (it calls .isDone under the hood).

I'm trying to create a kind of cache of memoized results, where if a thread wants something that is already being processed, it just waits for the existing computation to finish. The cache is an atom so I can't swap! a future into it, because creating a future has a side-effect, so I create it as a delay then deref it once the swap is done. Now I'm trying to clear down stale results from the cache so obviously I want to ignore any that are still being computed.

maybe I can just put a promise in the cache and have a free-running future that signals the promise when it's done

Depends what's in it. See if this helps: https://clojure.org/guides/deps_and_cli https://clojure.org/reference/deps_and_cli

https://github.com/anisoptera/screeps-cljs/blob/master/scripts/build.clj

this the file

hm actually i need to run the whole .clj file

deploy-build is just something used during a build/watch

Then https://clojure.org/reference/deps_and_cli#_running_a_main_or_script

clj -M /path/to/myscript.clj

ok so i needed the -M option

now i get

clj -M ./scripts/build.clj
Syntax error (FileNotFoundException) compiling at (E:\workspace-clj\screeps-cljs\.\scripts\build.clj:1:1).
Could not locate cljs/build/api__init.class, cljs/build/api.clj or cljs/build/api.cljc on classpath.

i need to set something in the classpath? or something?

seems that it does not even pass the first require

@U491NPF2S that file is part of a leiningen project with this project.clj: https://github.com/anisoptera/screeps-cljs/blob/master/project.clj

the only way you can run that is through leiningen

i have lein but still dont know how to run and trigger the whole thing

The README of that project suggests you run this script: https://github.com/anisoptera/screeps-cljs/blob/master/scripts/watch

damn i saw that in the readme but was not seeing the shell script

on windows

I guess on windows you would leave out rlwrap but the rest should more or less work, give or take a few slashes

clojure.lang.ExceptionInfo: failed compiling file:src\screeps\memory.cljs {:file #object[java.io.File 0x2bc0b8c8 "src\\screeps\\memory.cljs"]}

Caused by: clojure.lang.ExceptionInfo: No such namespace: cognitect.transit, could not locate cognitect/transit.cljs, cognitect/transit.cljc, or Closure namespace "cognitect.transit" {:tag :cljs/analysis-err
or}

now i am guessing i am missing some dependency

the project seems v old

yeah, that's weird. he mentions transit in the README, but it doesn't seem part of the project.clj

but you could add it

https://github.com/cognitect/transit-cljs

yea trying to add and run [com.cognitect/transit-clj "1.0.324"]

except i need the cljs one :

[com.cognitect/transit-cljs "0.8.264"]

yes

um

some warning on that transit script

but

export SCREEPS_USERNAME and SCREEPS_PASSWORD (optionally SCREEPS_BRANCH) to autodeploy code.

this is the error message from the build.clj

is great so far