javadoc of invoke() method of java.lang.reflect does not mention
what will be the return type in case return types are arrays of
primitive types. Whereas it says in cae of primitive type it is first
appropriately wraped in an Object.

As the return type is Object people trying to use the Syntax
(Object[])invoke();
will hit ClassCastException if return type of method they tried to invoke
is primitive array type.

It is more hard to guess now since Autoboxing is in place.