Hi:
Now I use rich:dataTable to show list data of type List. I add one column of h:selectBooleanCheckbox for user to choose muti items in the table . You can press a button to submit the selection at the same time. I add a boolean property to the WarningItem to get what items are selected where user click the submit button. It works.

For the convenience of the users, I want to add another h:selectBooleanCheckbox to control all other h:selectBooleanCheckbox in the rich:dataTable of the current page. However, I can not get the object list from rich:dataTable of the current page! So the problem is , I click that special h:selectBooleanCheckbox and make all items in the rich:dataTable selected ,including the items in other pages.

<h:form id="warningListForm" rendered="#{not empty warningQuery.resultList}">
 <rich:dataTable id="warningList" rows="3"
 onRowMouseOver="this.style.backgroundColor='#F1F1F1'"
 onRowMouseOut="this.style.backgroundColor='#{a4jSkin.tableBackgroundColor}'"
 cellpadding="0" cellspacing="0" var="row" sortMode="single"
 value="#{resultList}">

 <rich:column>
 <f:facet name="header">
 <h:selectBooleanCheckbox value="#{warningQuery.selectall}">Select All
 <a:support event="onclick" actionListener="#{warningQuery.allSelect('resultList')}"
 reRender="ckSelect" />
 </h:selectBooleanCheckbox>
 </f:facet>
 <h:selectBooleanCheckbox id="ckSelect" value="#{row.selected}"/>
 </rich:column>
 <rich:column sortBy="#{row.oldId}" rendered="#{user.hasField('oldid')}">
 <f:facet name="header">ID</f:facet>
 #{row.oldId}
 </rich:column>
 </rich:dataTable>
 <h:commandButton action="#{warningQuery.updateStatus('1')}"
 value="action1"/>
 <h:commandButton action="#{warningQuery.updateStatus('3')}"
 value="action2"/>
 <br/>
 <rich:datascroller id="warningListScroller" align="left" for="warningList" maxPages="20" fastControls="hide">
 <f:facet name="next">
 <h:outputText value=">"/>
 </f:facet>
 <f:facet name="previous">
 <h:outputText value="<"/>
 </f:facet>
 </rich:datascroller>
</h:form>

@Stateful
@Scope(ScopeType.SESSION)
@Name("warningQuery")
@SuppressWarnings(value={"unchecked","serial"})
public class WarningQueryBean implements WarningQuery {

 @DataModel
 private List<WarningItem> resultList;

 public void updateStatus(String status) {
 log.info("status="+status);
 log.info("status="+resultList.size());
 if(resultList!=null){
 for(WarningItem wi:resultList)
 {
 if(wi.isSelected()==true){
 wi.setSelected(false);
 wi.setStatus(status);
 em.merge(wi);
 }
 }
 }
 selectall = false;
 }

public void allSelect(String dataName){
 Object o=Contexts.lookupInStatefulContexts(dataName);
 if(o!=null&&o instanceof javax.faces.model.DataModel){
 javax.faces.model.DataModel dm=(javax.faces.model.DataModel)o;
 List<WarningItem> temList=(List<WarningItem>)dm.getWrappedData();
 if(temList!=null&&temList.size()>0){
 for(WarningItem wrap:temList){ // MAKE ALL ITEMS SELCTED,INCLUDING THE ONES IN OTHER PAGES
 wrap.setSelected(selectall);
 log.info("wrap="+wrap.getOldId());
 }
 }
 }
}

@Entity
@Table(name = "warning_item")
@SuppressWarnings(value={"serial"})
public class WarningItem implements Serializable{
 @Logger
 Log log;

 Integer id;
 Integer oldId;
 boolean selected; //FOR THE h:selectBooleanCheckbox