I’m having problems visually parsing src/jvm/clojure/lang/Compiler.java Is the file intended to be indented with 4 or 8 space tabs?

we have this weird bug: a piece of code that calls requiring-resolve on some symbol, pointing to a fn in another ns (nothing exotic). Calls to that fn fail initially and then work fine subsequently. I am a bit baffled. We get a Attempting to call unbound fn: #'foo.bar/baz

I cannot reproduce it either, it just pops in our sentry sometimes

I know that requiring resolve relies on serialized-require so in theory that should be safe, but I am wondering if there's not a bug somewhere at this level eventually

the required ns is not used anywhere else either (so no "lone" require call somewhere else that would cause some concurrency issue)

anyway, if that rings a bell I am all hears

are you loading your application via Java @mpenet? (either through clojure.java.api.Clojure or otherwise)

no

it's an uberjar'ed service

pure clojure

starting clojure.main or a gen class?

gen-class

the ns where the fn resides is not used/loaded anywhere else, as far as I can see in the sources

(I'm trying to rule out something grabbing a var before Clojure runtime initializes)

actually I think it breaks after it (the service) has been running for a while

which makes it even weirder

anyway I need to do more digging

I actually see something like that in Cursive too, which I’ve been meaning to investigate. I call into Clojure from Java/Kotlin a lot, and I have a delay() function which creates an implementation of IFn called DelayedFn. It delegates all its calls like this:

public Object invoke() {
    return getDelegate().invoke();
  }

private IFn getDelegate() {
    // See 
    IFn result = delegate;
    if (result == null) {
      synchronized (this) {
        result = delegate;
        if (result == null) {
          if (!"clojure.core".equals(namespace)) {
            REQUIRE.invoke(asSym(namespace));
          }

          delegate = var(namespace, name);
          result = delegate;
        }
      }
    }
    return result;
  }