static <A> A jextractSerializedObject(S s, Class<A> c) {
  L<S> tok = javaTok(s);
  int i = indexOf(tok, shortClassName(c));
  if (i < 0) null;
  int j = i+1;
  if (eq(get(tok, i+2), "("))
    j = findEndOfBracketPart(tok, i+2);
  s = joinSubList(tok, i, j);
  ifdef jextractSerializedObject_debug
  print("ser >> " + s);
  endifdef
  ret (A) unstruct(s);
}