code: public static boolean isPrimitiveWrapperArray(Class<?> clazz) {
  		Assert.notNull(clazz, "Class must not be null");
  		return (clazz.isArray() && isPrimitiveWrapper(clazz.getComponentType()));
  	}
docs: Check if the given class represents an array of primitive wrappers,
  i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double.
  @param clazz the class to check
  @return whether the given class is a primitive wrapper array class