/**
* Initializes the attributes of the bean with 0.
* Is called by Spring container.
*/
protected void init() {
Configuration config = getConfigDAO().getConfiguration();
int scale = config.getScale();
setNumberOfDays(
BigDecimal.ZERO.setScale(scale, ROUND_METHOD));
setNumberOfHours(
BigDecimal.ZERO.setScale(scale, ROUND_METHOD));
setIncomes(