RadioDDMFormFieldValueRequestParameterRetriever implements DDMFormFieldValueRequestParameterRetriever { @Override public String get( HttpServletRequest httpServletRequest, String ddmFormFieldParameterName, String defaultDDMFormFieldParameterValue) { String parameterValue = httpServletRequest.getParameter( ddmFormFieldParameterName); if (parameterValue == null) { return getPredefinedValue(defaultDDMFormFieldParameterValue); } return GetterUtil.getString(parameterValue); }  @Override String get(
		HttpServletRequest httpServletRequest, String ddmFormFieldParameterName,
		String defaultDDMFormFieldParameterValue);  }
@Test public void testEmptySubmitWithoutPredefinedValue() { String fieldValue = _radioDDMFormFieldValueRequestParameterRetriever.get( new MockHttpServletRequest(), "radio0", "[]"); Assert.assertEquals(StringPool.BLANK, fieldValue); }