Tensegritics / Tensegritics/ClojureDart

[Windows] NPE when running `clj -M:cljd init` in `hello/` example project

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Description

Hey!

I'm on windows and my terminal is bash from msys2-mingw64. I installed clojure as a powershell module. I can run clj by calling powershell -encodedcommand YwBsAGoA see here.

$ powershell -encodedcommand YwBsAGoA
Clojure 1.11.1
user=> (inc 8)
9

I was following the readme and copied and pasted the commands that setup hello/deps.edn and hello/src/acme/main.cljd. In hello, when I run clj -M:cljd init I get an NullPointerException.

$ powershell -encodedcommand YwBsAGoAIAAtAE0AOgBjAGwAagBkACAAaQBuAGkAdAA=
Initializing hello as a flutter project!
Execution error (NullPointerException) at cljd.build/exec$iter$fn (build.clj:133).
Cannot invoke "Object.getClass()" because "target" is null

Full report at:
C:\Users\me\Apps\msys64\tmp\clojure-18015447307752204145.edn
{:clojure.main/message
 "Execution error (NullPointerException) at cljd.build/exec$iter$fn (build.clj:133).\r\nCannot invoke \"Object.getClass()\" because \"target\" is null\r\n",
 :clojure.main/triage
 {:clojure.error/class java.lang.NullPointerException,
  :clojure.error/line 133,
  :clojure.error/cause
  "Cannot invoke \"Object.getClass()\" because \"target\" is null",
  :clojure.error/symbol cljd.build/exec$iter$fn,
  :clojure.error/source "build.clj",
  :clojure.error/phase :execution},
 :clojure.main/trace
 {:via
  [{:type java.lang.NullPointerException,
    :message
    "Cannot invoke \"Object.getClass()\" because \"target\" is null",
    :at
    [clojure.lang.Reflector
     invokeInstanceMethod
     "Reflector.java"
     97]}],
  :trace
  [[clojure.lang.Reflector invokeInstanceMethod "Reflector.java" 97]
   [cljd.build$exec$iter__6987__6993$fn__6994 invoke "build.clj" 133]
   [clojure.lang.LazySeq sval "LazySeq.java" 42]
   [clojure.lang.LazySeq seq "LazySeq.java" 51]
   [clojure.lang.LazySeq first "LazySeq.java" 73]
   [clojure.lang.RT first "RT.java" 692]
   [clojure.core$first__5449 invokeStatic "core.clj" 55]
   [clojure.core$first__5449 invoke "core.clj" 55]
   [cljd.build$exec invokeStatic "build.clj" 131]
   [cljd.build$exec doInvoke "build.clj" 110]
   [clojure.lang.RestFn applyTo "RestFn.java" 137]
   [clojure.core$apply invokeStatic "core.clj" 675]
   [clojure.core$apply doInvoke "core.clj" 662]
   [clojure.lang.RestFn invoke "RestFn.java" 533]
   [cljd.build$init_project invokeStatic "build.clj" 342]
   [cljd.build$init_project invoke "build.clj" 322]
   [cljd.build$_main invokeStatic "build.clj" 491]
   [cljd.build$_main doInvoke "build.clj" 483]
   [clojure.lang.RestFn applyTo "RestFn.java" 137]
   [clojure.lang.Var applyTo "Var.java" 705]
   [clojure.core$apply invokeStatic "core.clj" 667]
   [clojure.main$main_opt invokeStatic "main.clj" 514]
   [clojure.main$main_opt invoke "main.clj" 510]
   [clojure.main$main invokeStatic "main.clj" 664]
   [clojure.main$main doInvoke "main.clj" 616]
   [clojure.lang.RestFn applyTo "RestFn.java" 137]
   [clojure.lang.Var applyTo "Var.java" 705]
   [clojure.main main "main.java" 40]],
  :cause
  "Cannot invoke \"Object.getClass()\" because \"target\" is null"}}

I'm calling clj -M:cljd init with powershell -encodedcommand YwBsAGoAIAAtAE0AOgBjAGwAagBkACAAaQBuAGkAdAA= see here.

Does your problem persist after clj -M:cljd clean && flutter clean?

clj -M:cljd clean

$ powershell -encodedcommand YwBsAGoAIAAtAE0AOgBjAGwAagBkACAAYwBsAGUAYQBuAA==
ClojureDart build state succesfully cleaned!
If problems persist, try flutter clean

^did not help.
I don't have flutter installed.

Thanks!

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing clj -M:cljd init in the hello/ example on the reported Windows/MSYS2 setup, then inspect build.clj around line 133 and the init_project entry point. Compare the execution path with clj -M:cljd clean; done means initialization completes without the NullPointerException and creates the Flutter project.

Written by the indexing model from the issue text.

Assessment

Tech stack
clojure, dart, flutter, powershell
Domain
build-system, cli, mobile-dev
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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