repl socket fails to open

[lynaghk]

Is lein repl supported with the lein2 branch of the buildpack?

I end up with the following stacktrace:

All namespaces already :aot compiled.
Exception in thread "main" java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
        at java.net.Socket.connect(Socket.java:546)
        at java.net.Socket.connect(Socket.java:495)
        at java.net.Socket.<init>(Socket.java:392)
        at java.net.Socket.<init>(Socket.java:206)
        at clojure.tools.nrepl$connect.doInvoke(nrepl.clj:173)
        at clojure.lang.RestFn.invoke(RestFn.java:421)
        at clojure.tools.nrepl.ack$send_ack.invoke(ack.clj:47)
        at clojure.tools.nrepl.server$start_server.doInvoke(server.clj:95)
        at clojure.lang.RestFn.invoke(RestFn.java:457)
        at user$eval730.invoke(NO_SOURCE_FILE:1)
        at clojure.lang.Compiler.eval(Compiler.java:6511)
        at clojure.lang.Compiler.eval(Compiler.java:6501)
        at clojure.lang.Compiler.eval(Compiler.java:6477)
        at clojure.core$eval.invoke(core.clj:2797)
        at clojure.main$eval_opt.invoke(main.clj:297)
        at clojure.main$initialize.invoke(main.clj:316)
        at clojure.main$null_opt.invoke(main.clj:349)
        at clojure.main$main.doInvoke(main.clj:427)
        at clojure.lang.RestFn.invoke(RestFn.java:421)
        at clojure.lang.Var.invoke(Var.java:419)
        at clojure.lang.AFn.applyToHelper(AFn.java:163)
        at clojure.lang.Var.applyTo(Var.java:532)
        at clojure.main.main(main.java:37)
REPL server launch timed out.

[technomancy]

Confirmed this is an issue. Until I get it fixed, try using heroku run lein trampoline run -m clojure.main/main for a repl as a workaround. You may need to rlwrap that on the client side.

[lynaghk]

Thanks for the workaround, it's enough for what I need to do right now.

[technomancy]

This will be fixed once 2.0.0-preview8 is deployed; shooting for next week.

[technomancy]

I'm an idiot; this is still an issue.

[technomancy]

Fixed in the latest commit to Leiningen, will backport it to preview10 via a plugin in the buildpack.

[technomancy]

So the problem here is that localhost isn't isolated on a per-dyno level, so listening on it for your repl would open your app up to anyone else on the same underlying instance. The solution is to keep it all in-process, which I just added to lein master: technomancy/leiningen@975e3eb

However to use it on preview10 I spun it off into its own plugin: https://github.com/technomancy/lein-standalone-repl

And now the buildpack will transparently alias lein repl to lein standalone-repl.