public int getColumnSize(Class mappedClass, String propertyName)
{
    Configuration cfg= HibernateUtils.getConfig();
    PersistentClass pClass= cfg.getClassMapping(mappedClass);
    Property hibProp= pClass.getProperty(propertyName)
    Iterator it= hibProp.getColumnIterator();
    while (it.hasNext()) {
        Column col= (Column) hibProp.getColumnIterator().next();
        return col.getLength();
    }
}