File: t.h

struct Point2D {
   int i, j;
};

struct Point {
  int k;
  struct Point2D point2d;
};

struct Point func(void);

File: t.c


#include "t.h"
  
struct Point point = { 44, { 567, 33 } };
struct Point func(void) {
    return point;
}

File: Main.java

import static org.acme.t_h.*;
  
class Main {
    public static void main(String[] args) {
         System.out.println(CPoint.$LAYOUT());
         System.out.println(func());
    }
}

File: compile.sh

cc -shared -o libt.dylib t.c
jextract -t org.acme -l t t.h
javac --add-modules jdk.incubator.foreign Main.java

File: run.sh

java --add-modules jdk.incubator.foreign -Dforeign.restricted=permit Main


When running, the above results in the following stack trace:

 java.lang.BootstrapMethodError: bootstrap method initialization exception
at org.acme.t_h.func(t_h.java:20)
at Main.main(Main.java:6)
Caused by: java.lang.BootstrapMethodError: bootstrap method initialization exception
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:194)
at java.base/java.lang.invoke.ConstantBootstraps.makeConstant(ConstantBootstraps.java:72)
at java.base/java.lang.invoke.MethodHandleNatives.linkDynamicConstantImpl(MethodHandleNatives.java:326)
at java.base/java.lang.invoke.MethodHandleNatives.linkDynamicConstant(MethodHandleNatives.java:318)
at org.acme.t_h$constants.func$MH(Unknown Source)
at org.acme.t_h.func(t_h.java:18)
... 1 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
at jdk.incubator.foreign/jdk.internal.foreign.abi.x64.sysv.CallArranger$StorageCalculator.structStorages(CallArranger.java:262)
at jdk.incubator.foreign/jdk.internal.foreign.abi.x64.sysv.CallArranger$BoxBindingCalculator.getBindings(CallArranger.java:368)
at jdk.incubator.foreign/jdk.internal.foreign.abi.x64.sysv.CallArranger.getBindings(CallArranger.java:111)
at jdk.incubator.foreign/jdk.internal.foreign.abi.x64.sysv.CallArranger.arrangeDowncall(CallArranger.java:130)
at jdk.incubator.foreign/jdk.internal.foreign.abi.x64.sysv.SysVx64ABI.downcallHandle(SysVx64ABI.java:61)
at org.acme.RuntimeHelper.lambda$downcallHandle$2(RuntimeHelper.java:62)