Klass* Universe::_boolArrayKlassObj = NULL;
Klass* Universe::_byteArrayKlassObj = NULL;
Klass* Universe::_charArrayKlassObj = NULL;
Klass* Universe::_intArrayKlassObj = NULL;
Klass* Universe::_shortArrayKlassObj = NULL;
Klass* Universe::_longArrayKlassObj = NULL;
Klass* Universe::_singleArrayKlassObj = NULL;
Klass* Universe::_doubleArrayKlassObj = NULL;
Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
Klass* Universe::_objectArrayKlassObj = NULL;

There are loops in universe.cpp look like the iterate over null items.

metaspace_pointers_do:
  for (int i = 0; i < T_VOID+1; i++) {
    it->push(&_typeArrayKlassObjs[i]);
  }

serialize:
    for (int i = 0; i < T_VOID+1; i++) {
      if (_typeArrayKlassObjs[i] != NULL) {
        assert(i >= T_BOOLEAN, "checking");
        f->do_ptr((void**)&_typeArrayKlassObjs[i]);
      } else if (do_all) {
        f->do_ptr((void**)&_typeArrayKlassObjs[i]);
      }

typeArrayKlassObj[T_OBJECT] appears uninitialized.

  f->do_ptr((void**)&_singleArrayKlassObj);
singleArrayKlassObj is for T_FLOAT

And the basic_type_pointers_do, serialize, metaspace_pointers_do walk _{type}ArrayKlassObj individually.

There's no typeArrayKlassObj for T_ARRAY but it is covered in the range of for loops.

Suggest removing the individual _{type}ArrayKlassObj and have the functions
Klass* boolArrayKlassObj() { return typeArrayKlassObj[T_BOOLEAN]; }
for example.