* @return {@link FieldDesc}
     */
    FieldDesc getFieldDesc(String fieldName);

    /**
     * Returns the {@link FieldDesc}.
     *
     * @param index
     *            The index of the {@link FieldDesc}
     * @return {@link FieldDesc}
     */
    FieldDesc getFieldDesc(int index);

    /**
     * Returns the number of {@link FieldDesc}.
     *

        assertArgumentNotEmpty("fieldName", fieldName);

        return fieldDescCache.containsKey(fieldName);
    }

    @Override
    public FieldDesc getFieldDesc(final String fieldName) {
        assertArgumentNotEmpty("fieldName", fieldName);

        final FieldDesc fieldDesc = fieldDescCache.get(fieldName);
        if (fieldDesc == null) {

        final FieldDesc aaa = beanDesc.getFieldDesc("aaa");
        aaa.getStaticFieldValue();
    }

    /**
     * @throws Exception
     */
    @Test(expected = FieldNotStaticRuntimeException.class)
    public void testAaa_SetStaticFieldValue() throws Exception {
        final BeanDesc beanDesc = new BeanDescImpl(MyBean.class);
        final FieldDesc aaa = beanDesc.getFieldDesc("aaa");

    public void testGetFieldDescs() throws Exception {
        final BeanDesc beanDesc = new BeanDescImpl(MyBean.class);
        assertThat(beanDesc.hasFieldDesc("HOGE"), is(true));
        final FieldDesc fieldDesc = beanDesc.getFieldDesc("HOGE");
        assertThat(fieldDesc.getFieldName(), is("HOGE"));
        assertThat(beanDesc.hasFieldDesc("aaa"), is(true));
        assertThat(beanDesc.hasFieldDesc("aaA"), is(not(true)));
    }

    /**