This sample code doesn't work for me.
Could somebody help me to fix it? my try's weren't successful...

<table>
 <a4j:repeat value="#{repeatBean.numbers}" var="rec" rowKeyVar="rowIndex" ajaxKeys="#{repeatBean.rowsToUpdate}">
 <tr>
 <td width="20px">
 <h:outputText id="num" value="#{rec.number}" />
 </td>
 <td>
 <a4j:commandLink value="-" reRender="num" actionListener="#{repeatBean.decrease}">
 <a4j:actionparam name="rowIndex" value="#{rowIndex}"
 assignTo="#{repeatBean.updatedRow}" />
 </a4j:commandLink>
 /
 <a4j:commandLink value="+" reRender="num" actionListener="#{repeatBean.increase}">
 <a4j:actionparam name="rowIndex" value="#{rowIndex}"
 assignTo="#{repeatBean.updatedRow}" />
 </a4j:commandLink>
 </td>
 </tr>
 </a4j:repeat>
</table>

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.annotation.PostConstruct;
import javax.faces.event.ActionEvent;

public class RepeatBean {

 private List<NumberBean> numbers;
 private Set<Integer> rowsToUpdate;
 private Integer updatedRow;

 @PostConstruct
 public void init() {
 numbers = new ArrayList<NumberBean>();
 numbers.add(new NumberBean());
 numbers.add(new NumberBean());
 numbers.add(new NumberBean());
 numbers.add(new NumberBean());
 numbers.add(new NumberBean());
 rowsToUpdate = new HashSet<Integer>();
 updatedRow = 0;
 }

 public List<NumberBean> getNumbers() {
 return numbers;
 }

 public void setNumbers(List<NumberBean> numbers) {
 this.numbers = numbers;
 }

 public Set<Integer> getRowsToUpdate() {
 return rowsToUpdate;
 }

 public Integer getUpdatedRow() {
 return updatedRow;
 }

 public void setUpdatedRow(Integer updatedRow) {
 this.updatedRow = updatedRow;
 }

 public void increase(ActionEvent event) {
 rowsToUpdate.clear();
 numbers.get(updatedRow).increase();
 rowsToUpdate.add(updatedRow);
 }

 public void decrease(ActionEvent event) {
 rowsToUpdate.clear();
 numbers.get(updatedRow).decrease();
 rowsToUpdate.add(updatedRow);
 }

}

public class NumberBean {

 private Integer number;

 public NumberBean() {
 number = 10;
 }

 public Integer getNumber() {
 return number;
 }

 public void setNumber(Integer number) {
 this.number = number;
 }

 public void increase() {
 ++number;
 }

 public void decrease() {
 --number;
 }

}