Map should be removed from the documentation. The reason is that if we have a map as input to a table, what values should we use? map.values(), map.keySet() or map.entrySet()?

The correct way would be to do something like:

public List<DeviceInteger> mkExcelExport() {
		List<DeviceInteger> ret = new LinkedList<DeviceInteger>();
		calcAvailabilityMonth();
		ret.addAll(c_DevicesAvavailabilityMonth);
		return ret;
}

public class DeviceInteger {
     private Device device;
     private integer integer;
     // getter, setters, constructor
}

Actually, I think it's sort of doable, I tried adding to UIWorksheet.unwrapIterator a

      else if (value instanceof Map) {
          return ((Map) value).entrySet().iterator();
      }

and added a test method that returned

   public Map<String, String> getFoo() {
       Map foo = new HashMap<String, String>();
       foo.put("a", "1");
       foo.put("b", "2");
       foo.put("c", "3");
       return foo;
   }

and xhtml

<e:workbook
	xmlns:e="http://jboss.com/products/seam/excel"
	xmlns:f="http://java.sun.com/jsf/core">
	<e:worksheet value="#{excelTest.foo}" var="data">
		<e:column>
			<e:cell value="#{data.value}"/>
		</e:column>
	</e:worksheet>
</e:workbook>

and I actually got an excel but it looked like

2
3
1

which is quite natural, since Maps don't guarantee iteration order. Which renders the Map usecase, well, useless in most cases. Or?

Thank you for taking your time on this!

For me, it would be very useful if the worksheet would have the same behavior like a dataTable...
(It's the same useCase, I have a Collection which I'd like to display in rows and columns:

For example to iterate a map:

<h:dataTable id="test" var="map" value="#{myHashMap}">                                         
   <h:column>
     <f:facet name="header">
       <h:outputText value="My Header 1" />
     </f:facet>
     #{map.key.name}
   </h:column>
   <h:column>
     <f:facet name="header">
       <h:outputText value="My Header 2" />
     </f:facet>
     #{map.value.serialNumber}
   </h:column>
</h:dataTable>

In case of the iteration order of a map, I always use the LinkedHashmap or Treemap to have a ordered Map, so this should be possible?!

Greetings
Daniel

I committed the Map-fix.