Datatable to display a Map of ArrayList of objects in Tomahawk

Question

I want to display a Map<Integer, ArrayList<ObjectBO>> in a Datatable in Tomahawk. I've tried some possible solutions but nothing seems to be work.

<h:panelGrid style="font-family:verdana;font-size:12pt;color:white" columns="1">
    <h:outputText value="Choice 1"></h:outputText>
    <t:dataTable newspaperColumns="1" value="#{startupBean.choiceKeys}" newspaperOrientation="horizontal" var="key">
        <t:column>    
            <h:outputText style="font-family:verdana;font-size:10pt;color:white" value="#{choiceMap[key].ObjectBO.displayName}"/>
        </t:column>
        <t:column>     
            <h:graphicImage width="50" height="50" id="choice" alt="jsf-sun" url="#{choiceMap[Key].ObjectBO.color_url}" value="#{choiceMap[Key].ObjectBO.color_url}"> 
            </h:graphicImage>  
        </t:column> 
    </t:dataTable>
</h:panelGrid>

The backing bean part of it is

public List<Integer> getChoiceKeys() {
    System.out.println("in keys");
    List<Integer> keys = new ArrayList<Integer>();
    keys.addAll(choiceMap.keySet());
    System.out.println("keys " + keys.size());
    return keys;
}

Kindly let me know how to traverse through the Map via Datatable.

Answer 1

Numbers are in EL treated as Long . In your code, the key in #{choiceMap[key]} is treated as Long and hence the map key never matches because Integer is not an instance of Long . This approach will work if you use Long instead of Integer as map key.