Method m = Baz.class.getMethod("rawMap", Map.class);
        assertThat(MethodUtil.getKeyTypeOfMapFromParameterType(m, 0), is(nullValue()));

        m = Baz.class.getMethod("genericMap", Map.class);
        assertThat(MethodUtil.getKeyTypeOfMapFromParameterType(m, 0), is(sameClass(Integer.class)));
    }

    /**
     * @throws Exception
     */
    @Test

     * @param position
     *            The position of the parameterized map in the method's argument list
     * @return The key type of the parameterized map
     */
    public static Class<?> getKeyTypeOfMapFromParameterType(final Method method, final int position) {
        assertArgumentNotNull("method", method);

        final Type[] parameterTypes = method.getGenericParameterTypes();