Unable to read selected values from selectManyListbox control

Question

I have selectManyListbox component in my jsp page as follows:
<h:selectManyListbox id="allBusinessFunctions" styleClass="maintxtbox selectCampaignBox" >
<f:selectItems value="#{pc_CreateCampaigns.bizFunctions}"/>
</h:selectManyListbox>
I am doing multiple selections on the component. In the same jsp page I have graphicImage component as follows:
<h:graphicImage id="createCampaignLink" alt="Click on this" url="/theme/img/button-use.gif">
<hx:behavior event="onclick" behaviorAction="get" targetAction="bizFunDetailsGroup"></hx:behavior>
</h:graphicImage>
On click of this graphicImage I am invoking a ajax call to one of the backing bean method getDisplayBizFunctions().
I also have a panel group component as follows:
<h:panelGroup id="bizFunDetailsGroup" styleClass="panelGroup">
<h:dataTable id="bizFunDetails" value="#{pc_CreateCampaigns.displayBizFunctions}" var="bizFunctions" border="0">
<h:column>
<f:facet name="header">
     <h:outputText value="Column1"/>
</f:facet>
<h:outputText value="#{bizFunctions}"/>                                        
</h:column>
</h:dataTable>
</h:panelGroup>
<hx:ajaxRefreshRequest id="ajaxRefreshRequest3" target="bizFunDetailsGroup" params="allBusinessFunctions"></hx:ajaxRefreshRequest>
In my backing bean I have a method as follows:
public ArrayList getDisplayBizFunctions(){                         
bizTypeSearch = (String)getRequestParam().get("allBusinessFunctions");
System.out.println("bizTypeSearch =" + bizTypeSearch );                         
          return null;
I am trying to read the multiple selected values of as
getRequestParam().get("allBusinessFunctions");
Which is returing only the first selected items value but not all..
How can get all the selected values?

Answer 1

To the point: you should have used HttpServletRequest#getParameterValues(), not getParameter().
In this specific case: just bind the <h:selectManyListbox> 'value' property with a List<BizFunctionType> property in the backing bean.