h:selectManyCheckbox reRender rich:dataTable

[ya ji]

I want to reRender a dataTable when select one or many selectManyCheckbox, my code as below, currently when I select a checkbox, nothing happened, who can help me to solve this problem,thanks in advance.

  
<h:selectManyCheckbox id="pTypes" value="#{RoleBean.permissionType}" valueChangeListener="#{RoleBean.changePType}">
     <f:selectItem itemLabel="Service Based Type" itemValue="1" />
     <f:selectItem itemLabel="OrganizationType" itemValue="2" />
     <f:selectItem itemLabel="ConfigurationItemType" itemValue="3" />
     <a4j:support event="onclick" reRender="permission_panel" limitToList="true"></a4j:support>
</h:selectManyCheckbox>
 
<a4j:outputPanel id="permission_panel">
    <rich:dataTable id="permission_list_table" styleClass="userTable" rowClasses="userTableRow,userTableRowAlt" headerClass="userTableHeader" columnClasses="userTableColumn" value="#{RoleBean.permissionValues}" var="permission">
        <rich:columnGroup>
              <rich:column>
                  <f:facet name="header"> </f:facet>
                  <h:selectBooleanCheckbox label="Permissions" required="true" id="permissions" value="#{RoleBean.pSelection[permission]}" ></h:selectBooleanCheckbox>
              </rich:column>
              <rich:column>
                  <f:facet name="header">Name</f:facet>
                  <h:outputText value="#{permission.name}"/>
              </rich:column>                                               
         </rich:columnGroup>
   </rich:dataTable>
</a4j:outputPanel>

[ya ji]

the error message is:
Conversion Error setting value '2' for '#{RoleBean.permissionType}'.