java.util.List in rquest missed in WADL

[yhu]

Hi, 
I am newer to REST web service. Recently, I created a simple REST web
service based on CXF 2.3.2:

@Path("/luckynumbers")
@Produces("text/plain")
public class LuckyNumbers {
   
    @GET
    @Path("/getWADL")
    @Produces("application/xml")
    public ResponseWrapper getWADL(@QueryParam("") RequestWrapper arg) {
        return new ResponseWrapper();
    }



    @XmlRootElement 
    public static class ResponseWrapper {

        List<String> theList;
        String theResponse;


        public String getTheResponse() {
            return theResponse;
        }

        public void setTheResponse(String theResponse) {
            this.theResponse = theResponse;
        }

        @XmlElement(name="listItem")
        public List<String> getTheList() {
            return theList;
        }

        public void setTheList(List<String> theList) {
            this.theList = theList;
        }
    }
   @XmlRootElement
    public static class RequestWrapper {
        List<String> theList;
        String theRequest;

       @XmlElement(name="listItem")
        public Collection<String> getTheList() {
            return theList;
        }

        public void setTheList(List<String> theList) {
            this.theList = theList;
        }

        public String getTheRequest() {
            return theRequest;
        }

        public void setTheRequest(String theRequest) {
            this.theRequest = theRequest;
        }
    }
}

The WADL is as below:

<application xmlns="http://wadl.dev.java.net/2009/02";
xmlns:xs="http://www.w3.org/2001/XMLSchema";><grammars><xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema";
attributeFormDefault="unqualified" elementFormDefault="unqualified">
    <xs:element name="responseWrapper" type="responseWrapper"/>
    <xs:complexType name="responseWrapper">
        <xs:sequence>
            <xs:element maxOccurs="unbounded" minOccurs="0" name="listItem"
type="xs:string"/>
            <xs:element minOccurs="0" name="theResponse" type="xs:string"/>
        </xs:sequence>
    </xs:complexType>
</xs:schema>
</grammars><resources
base="http://localhost:8080/ws-rest-prototype/services/LuckyNumbersRest";><resource
path="/luckynumbers"><resource path="/getWADL"><method
name="GET"><request></request><response><representation
mediaType="application/xml"/></response></method></resource></resource></resources></application>

We can see that requestWrapper is not generated in WADL, so we cannot
publish such WADL to the client. The weird thing is that responseWrapper is
generated, but RequestWrapper and ResponseWrapper are totally same except
for the name. 

Can any one advice me how I can modify the code or configure so that the
WADL can represent the web service completely? Thanks

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