ConversionException: No value specified for 'Date'的解决版本

DateConverter converter = new DateConverter(defaultValue);

ConvertUtils.register(converter, java.util.Date.class);

org.apache.commons.beanutils.ConversionException: No value specified for 'Date'

1. ConvertUtils.register(new DateConverter(null), java.util.Date.class);
2. BeanUtils.copyProperties(article, approval);