关于jsf+jboss的复选框

为什么我在删除后刷新页面可以而在提交那个去可以刷新？
页面代码

<h:form>	
	<rich:datascroller align="left" for="list" maxPages="20" rendered="#{selectManyAction.count > 20}"/>
		<rich:spacer height="10" rendered="#{selectManyAction.count>20}" />
			<rich:dataTable width="100%" id="list" rows="20" columnClasses="col" value="#{selectManyAction.selectedDataList}" var="List" columnsWidth="30px,350,90px,120px,40px;" onRowMouseOver="this.style.backgroundColor='#f1f1f1'" onRowMouseOut="this.style.backgroundColor='#{a4jSkin.tableBackgroundColor}'">
				<rich:column headerClass="tableheader">
					<f:facet name="header">
						<h:outputText value="选择" styleClass="colheader"/>
					</f:facet>
					<h:selectBooleanCheckbox value="#{manySelect.lisMap[List.id]}">	
										
					</h:selectBooleanCheckbox>
					
				</rich:column>
				<rich:column headerClass="tableheader">
				<f:facet name="header">
						<h:outputText value="用户名" styleClass="colheader"/>
			    </f:facet>
			    <h:outputText value="#{List.userName}" />
				</rich:column>
				<f:facet name="footer">
				<rich:column colspan="2">
				<h:selectBooleanCheckbox value="#{selectManyAction.error}">
					<a4j:support event="onclick" reRender="datetable" action="#{selectManyAction.setAll()}" />
				</h:selectBooleanCheckbox> 
				<h:commandButton value="Get selected items" action="#{selectManyAction.getSelectedItems}" />
		    
			    <a4j:commandButton  action="#{selectManyAction.removeSelect}" value="删&#160;&#160;除" styleClass="signin_right02_center_right_button"/>		
			
				</rich:column>
				</f:facet>
				</rich:dataTable>
			  </h:form>

下为后台处理类：可能不能刷新原因是：a4j：buttom 的原因吧~！

@Name("selectManyAction")
@Scope(ScopeType.PAGE)
public class SelectManyAction {
	   // Init --------------------------------------------------------------------------------------   
	@In
	EntityManager entityManager;
	
	@In
	ManySelect manySelect; 
    
    private List<User> selectedDataList;
    
    private List<User> selectList;
    // Actions -----------------------------------------------------------------------------------   
    private long count;
    
    private boolean error = false;
    
    @SuppressWarnings("unchecked")
	@Create
    public void init(){
     selectedDataList = entityManager.createQuery("select o from User o").getResultList();
     for(User user:selectedDataList){
    	 System.out.println("userId======"+user.getId());
     }
     manySelect.clear();
     for(User user:selectedDataList){
    	 manySelect.put(user.getId(), false);
     }
     Map<Long, Boolean> map = manySelect.getLisMap();
     map.entrySet();
    }
    /*
     * 复选框中在同一层中时可以直接从页面传入ID和ID所对应的boolean型保存在一个对象中，当复选框为一层而事件处理为
     * 另一层时，复选框类型在服务端所对应的map类型会重新加载。
     */
	public String getSelectedItems() {   
    
        // Get selected items.   
        selectList = new ArrayList<User>();
        setCount(selectedDataList.size());
        for (User dataItem : selectedDataList) {  
        	System.out.println(manySelect.getLisMap().get(dataItem.getId()));
          
        }          
        return "selectMany.xhtml";  
    }  
	
	public void setAll(){
		Map<Long, Boolean> map = manySelect.getLisMap();
		for(Map.Entry<Long, Boolean> entry:map.entrySet()){
			entry.setValue(error);
		}
	}
	
	@Transactional
	public String removeSelect() {
		Map<Long, Boolean> map = manySelect.getLisMap();
		for(Map.Entry<Long, Boolean> entry:map.entrySet()){
			if(entry.getValue()){
			
				Long sid = entry.getKey();
				System.out.println("id====="+sid);
				User user = entityManager.find(User.class, sid);
				entityManager.remove(user);
			}
		}
		return "selectMany.xhtml";
	}
    
    // Getters -----------------------------------------------------------------------------------   
   

	public List<User> getSelectedDataList() {
		return selectedDataList;
	}

	public void setCount(long count) {
		this.count = count;
	}

	public long getCount() {
		return count;
	}

	public List<User> getSelectList() {
		return selectList;
	}

	public void setSelectList(List<User> selectList) {
		this.selectList = selectList;
	}

	public void setSelectedDataList(List<User> selectedDataList) {
		this.selectedDataList = selectedDataList;
	}

	public boolean isError() {
		return error;
	}

	public void setError(boolean error) {
		this.error = error;
	}
	
	
}

selectMany是由自己定义封装好的一个hashMap类，里面一系列操作可以更具自己多多选框的要求来设置，如不用selectMany也可以在此类中重新构造一个map函数