I need to pass a nested struct as argument to JNI function e.g.
struct A {
    int a
    struct B
}

struct B {
   long b
   struct B * next
}

What is a good way to do this. I think I can use GetFieldID and
SetField for each field but since the structs are big its very
cumbersome.

Should I just pass a string of values and compose this data structure
on the java side. What other options do I have?