AIMesh provides several overloaded create methods. There is one with an int parameter and another one with a long parameter. They have very different semantics.
This code snippet intends to call the one with the long parameter:
(defn read-model
"read a 3D model from a file"
[path]
(let [scene (Assimp/aiImportFile path (bit-or Assimp/aiProcess_Triangulate
Assimp/aiProcess_FlipUVs))]
(if (= scene nil)
(println (Assimp/aiGetErrorString))
(for [index (range (.mNumMeshes scene))]
(let [pointer (.get (.mMeshes scene) index)]
(assert (= (type pointer) java.lang.Long))
(AIMesh/create pointer))))))
The assertion right before the problematic call makes sure that pointer is indeed a long; but nevertheless the int overload of create is called, as can be verified in the stack trace:
{:clojure.main/message
"Execution error (IllegalArgumentException) at java.nio.Buffer/createCapacityException (Buffer.java:290).\ncapacity < 0: (-689151616 < 0)\n",
:clojure.main/triage
{:clojure.error/class java.lang.IllegalArgumentException,
:clojure.error/line 290,
:clojure.error/cause "capacity < 0: (-689151616 < 0)",
:clojure.error/symbol java.nio.Buffer/createCapacityException,
:clojure.error/source "Buffer.java",
:clojure.error/phase :execution},
:clojure.main/trace
{:via
[{:type clojure.lang.Compiler$CompilerException,
:message
"Syntax error macroexpanding at (learnopengl/core.clj:12:1).",
:data
{:clojure.error/phase :execution,
:clojure.error/line 12,
:clojure.error/column 1,
:clojure.error/source "learnopengl/core.clj"},
:at [clojure.lang.Compiler load "Compiler.java" 7665]}
{:type java.lang.IllegalArgumentException,
:message "capacity < 0: (-689151616 < 0)",
:at [java.nio.Buffer createCapacityException "Buffer.java" 290]}],
:trace
[[java.nio.Buffer createCapacityException "Buffer.java" 290]
[java.nio.Buffer <init> "Buffer.java" 253]
[java.nio.ByteBuffer <init> "ByteBuffer.java" 316]
[java.nio.ByteBuffer <init> "ByteBuffer.java" 324]
[java.nio.MappedByteBuffer <init> "MappedByteBuffer.java" 113]
[java.nio.DirectByteBuffer <init> "DirectByteBuffer.java" 107]
[java.nio.ByteBuffer allocateDirect "ByteBuffer.java" 360]
[org.lwjgl.system.Struct __create "Struct.java" 118]
[org.lwjgl.assimp.AIMesh create "AIMesh.java" 487]
[jdk.internal.reflect.DirectMethodHandleAccessor
invoke
"DirectMethodHandleAccessor.java"
103]
[java.lang.reflect.Method invoke "Method.java" 580]
[clojure.lang.Reflector invokeMatchingMethod "Reflector.java" 167]
[clojure.lang.Reflector invokeStaticMethod "Reflector.java" 332]
[learnopengl.mesh_model$read_model$iter__332__336$fn__337$fn__338
invoke
"mesh_model.clj"
66]
[learnopengl.mesh_model$read_model$iter__332__336$fn__337
invoke
"mesh_model.clj"
63]
[clojure.lang.LazySeq sval "LazySeq.java" 42]
[clojure.lang.LazySeq seq "LazySeq.java" 51]
[clojure.lang.RT seq "RT.java" 535]
[clojure.lang.RT countFrom "RT.java" 650]
[clojure.lang.RT count "RT.java" 643]
[learnopengl.core$eval351 invokeStatic "core.clj" 12]
[learnopengl.core$eval351 invoke "core.clj" 12]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.RT loadResourceScript "RT.java" 381]
[clojure.lang.RT loadResourceScript "RT.java" 372]
[clojure.lang.RT load "RT.java" 459]
[clojure.lang.RT load "RT.java" 424]
[clojure.core$load$fn__6908 invoke "core.clj" 6161]
[clojure.core$load invokeStatic "core.clj" 6160]
[clojure.core$load doInvoke "core.clj" 6144]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[clojure.core$load_one invokeStatic "core.clj" 5933]
[clojure.core$load_one invoke "core.clj" 5928]
[clojure.core$load_lib$fn__6850 invoke "core.clj" 5975]
[clojure.core$load_lib invokeStatic "core.clj" 5974]
[clojure.core$load_lib doInvoke "core.clj" 5953]
[clojure.lang.RestFn applyTo "RestFn.java" 142]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$load_libs invokeStatic "core.clj" 6016]
[clojure.core$load_libs doInvoke "core.clj" 6000]
[clojure.lang.RestFn applyTo "RestFn.java" 137]
[clojure.core$apply invokeStatic "core.clj" 669]
[clojure.core$require invokeStatic "core.clj" 6038]
[clojure.core$require doInvoke "core.clj" 6038]
[clojure.lang.RestFn invoke "RestFn.java" 408]
[user$eval140$fn__144 invoke "form-init15974239925031016013.clj" 1]
[user$eval140 invokeStatic "form-init15974239925031016013.clj" 1]
[user$eval140 invoke "form-init15974239925031016013.clj" 1]
[clojure.lang.Compiler eval "Compiler.java" 7194]
[clojure.lang.Compiler eval "Compiler.java" 7184]
[clojure.lang.Compiler load "Compiler.java" 7653]
[clojure.lang.Compiler loadFile "Compiler.java" 7591]
[clojure.main$load_script invokeStatic "main.clj" 475]
[clojure.main$init_opt invokeStatic "main.clj" 477]
[clojure.main$init_opt invoke "main.clj" 477]
[clojure.main$initialize invokeStatic "main.clj" 508]
[clojure.main$null_opt invokeStatic "main.clj" 542]
[clojure.main$null_opt invoke "main.clj" 539]
[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 "capacity < 0: (-689151616 < 0)",
:phase :execution}}
This repository contains the full code to reproduce the error. read-model is defined in mesh-model.clj.
I ran this with Clojure version 1.11.1 and Java version:
openjdk 21.0.7 2025-04-15
OpenJDK Runtime Environment (Red_Hat-21.0.7.0.6-2) (build 21.0.7+6)
OpenJDK 64-Bit Server VM (Red_Hat-21.0.7.0.6-2) (build 21.0.7+6, mixed mode, sharing)
There was a previous question on stackoverflow leading to this question.
