File: t.h


struct Point {
  int x;
  int y;
};


File: Main.java


import com.acme.t_h.Point;
  
class Main {
  public static void main(String[] args) {
      try (var pt = Point.allocate()) {
          Point.x$set(pt, 10);
          Point.y$set(pt, 43);
          System.out.println(Point.x$get(pt));
          System.out.println(Point.y$get(pt));
      }
  }
}

expected output:

10
43

output seen:

43
43

See also:

https://mail.openjdk.java.net/pipermail/panama-dev/2020-August/010386.html