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.