Enum conversion problem

[Vencent Chen]

Hi，all！
      I am testing the Struts Showcase 2.0.11.
      With the Java 5 Enum conversion, I think the checkboxlist 's list
property  availableOperations just come from OperationsEnumAction's
getAvailableOperations() method. So I change the name availableOperations
to  availableOperation .But it show error：The requested list
selectedOperations key %{availableOperations} could not be resolved as a
collection/array/map/enumeration/iterator type.......
      Ordinary Code:
      public List<OperationEnum> getAvailableOperations() {
        return Arrays.asList(OperationEnum.values());
      }
      <s:checkboxlist label="Operations"
                    name="selectedOperations"
                    list="%{availableOperations}"
                    listKey="name()"
                    listValue="name()"
     />
     Changed:
     public List<OperationEnum> getAvailableOperation() {
        return Arrays.asList(OperationEnum.values());
    }
    <s:checkboxlist label="Operations"
                    name="selectedOperations"
                    list="%{availableOperation}"
                    listKey="name()"
                    listValue="name()"
     />
    It seems so stupid to do so.But at the beginning ,I just can't  find
where the  availableOperations come from.Then I found it into Action
class.So I think this would run correctly.But it doesn't.
    Could any body explain it to me,please?
-- 
Vincent CHen