EDIT

public class DistributionTableView extends CustomComponent implements View{

    private final class AreaColumnGenerator implements ColumnGenerator {

        private static final long serialVersionUID = 1L;

        @Override

        public Object generateCell(Table source, Object itemId, Object columnId) {

            Property<?> containerProperty = source.getContainerProperty(itemId, columnId);

            Object value = null;

            if(containerProperty != null){

                value = containerProperty.getValue();

            }

            final UUID uuid = UUID.fromString(table.getItem(itemId).getItemProperty("uuid").getValue().toString());

            final ComboBox box = new ComboBox("Occurrence Status: ", PresenceAbsenceTermContainer.getInstance());

            final String area = columnId.toString();

            box.setImmediate(true);

            box.setBuffered(true);

            box.setValue(TermCacher.getInstance().getPresenceAbsenceTerm((String)value));

            box.addValueChangeListener(new ValueChangeListener() {

                private static final long serialVersionUID = 6221534597911674067L;

                @Override

                public void valueChange(ValueChangeEvent event) {

                    Taxon taxon = HibernateProxyHelper.deproxy(listener.getTaxonService().load(uuid), Taxon.class);

                    listener.updateDistributionField(area, box.getValue(), taxon);

                }

            });

            return box;

        }

    }