Clojurians Log v2

:bananadance:

feel the tingle in the air?

Hi there. I'm trying to compile simple code with lein native-image which is using com.jcraft.jsch.JSch and got following error

Error: No instances of <http://java.net|java.net>.Inet4Address are allowed in the image heap as this class should be initialized at image runtime. To see how this object got instantiated use -H:+TraceClassInitialization.
Detailed message:
Trace: Object was reached by 
	reading field com.jcraft.jsch.PortWatcher.anyLocalAddress 

(ns binssh.core
  (:import (com.jcraft.jsch JSch))
  (:gen-class))


(defn -main
  [& args]
  (let [[user host keyname & other] args
        ssh (JSch.)
        port 22]
    (let [sess (.getSession ssh user host port)]
      (.setPortForwardingL sess 8842 "localhost" 8888)
      (.connect sess))))

@romantsopin which graalvm version are you using?

@romantsopin I think this project might be using JSch: https://github.com/epiccastle/spire - maybe you can look at that

GraalVM CE 20.0.0

which java version, 8 or 11?

it's 13. This may cause problems?

13 is not a java version that graal supports, it's either 8 or 11

anyway, try with 19.3.1-java8

Will do, thank you!

also, take care that you don't get reflection, so put *warn-on-reflection* to true

I took option --initialize-at-run-time=com.jcraft.jsch.PortWatcher from epiccastle/spire and seems like it's working

this is awesome, thanks @borkdude!

Also maybe you have a good reference which explains all this flags in detail and how do exactly they work?

we have some docs here: https://github.com/lread/clj-graal-docs welcome to contribute if you have anything to add!

borkdude, any reason why java8 instead of java11?

@zilti I've had some issues with jdk11, so in case of problems it's good to see if java8 behaves differently