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https://issues.apache.org/jira/browse/CXF-2978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907325#action_12907325
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Daniel Kulp commented on CXF-2978:
----------------------------------
Well, for RETURN values (not parameters), you can add an
@XmlElementWrapper(nillable = true, name = "return") directly to the
List<Customer> findCustomer(); method of the CustomerService class and that
will work with CXF 2.2.10. Doing so is going outside the JAXWS spec though as
the spec doesn't provide for the XmlElementWrapper annotation to be added to
the WebMethods. It also ONLY works for return values as XmElementWrapper is
not allowed on method params. Just method and field locations.
But for the most part, according to spec, in this case, null is the correct
return. One the wire, there would not be any difference if you return an
empty list or null so, according to spec, it's mapped to null by default.
> CLONE -Return Type List gets null on client if an empty list is returned
> ------------------------------------------------------------------------
>
> Key: CXF-2978
> URL: https://issues.apache.org/jira/browse/CXF-2978
> Project: CXF
> Issue Type: Bug
> Components: JAXB Databinding
> Affects Versions: 2.1.8, 2.2.7, 2.2.9, 2.2.10
> Environment: JSE 1.5 on Win XP
> Reporter: Staffan Forsell
> Assignee: Daniel Kulp
> Priority: Critical
> Attachments: EmptyListExample-2.2.10.tar.gz
>
>
> If you have a function that returns an empty list the result will be null on
> client. Even If add a Responsewrapper to the interface it doesn't work. If
> have attached a little test project / program:
> Interface:
> @WebService(targetNamespace =
> "http://cxf.apache.org/demo/CustomerService/1/";, name = "CustomerService")
> @SOAPBinding(style = SOAPBinding.Style.DOCUMENT, use =
> SOAPBinding.Use.LITERAL)
> public interface CustomerService {
> @WebMethod(action = "findCustomer", operationName = "findCustomer")
> public @WebResult(name = "customerList")
> List<Customer> findCustomer();
>
>
> @WebMethod(action = "findCustomer2", operationName = "findCustomer2")
> @ResponseWrapper(className="demo.service.CustomerListResponse")
> public @WebResult(name = "customerList")
> List<Customer> findCustomer2();
> }
> The Implementation:
> @WebService(name = "CustomerService", serviceName = "CustomerService",
> targetNamespace = "http://cxf.apache.org/demo/CustomerService/1/";,
> endpointInterface = "demo.service.CustomerService")
> public class CustomerServiceImpl implements CustomerService {
> public List<Customer> findCustomer() {
> // very stupid method
> return new ArrayList<Customer>();
> }
> public List<Customer> findCustomer2() {
> // another very stupid method
> return new ArrayList<Customer>();
> }
> }
> And this is the main programm:
> public static void main(String args[]) throws Exception {
> new Server();
> System.out.println("Server ready...");
> // Now Call the Service
> JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean();
> factory.getInInterceptors().add(new LoggingInInterceptor());
> factory.getOutInterceptors().add(new LoggingOutInterceptor());
> factory.setServiceClass(CustomerService.class);
> factory.setAddress("http://localhost:9000/CustomerService";);
> CustomerService client = (CustomerService) factory.create();
> System.out.println("call findCustomer()");
> List<Customer> result = client.findCustomer();
> if (result != null)
> System.out.println("Listsize: " + result.size());
> else
> System.out.println("List is null: " + result);
> System.out.println("call findCustomer2()");
> result = client.findCustomer2();
> if (result != null)
> System.out.println("Listsize: " + result.size());
> else
> System.out.println("List is null: " + result);
> System.out.println("Server exiting");
> System.exit(0);
> }
> This will print the following output:
> Server ready...
> call findCustomer()
> 20.01.2010 07:49:45
> org.apache.cxf.interceptor.LoggingOutInterceptor$LoggingCallback onClose
> INFO: Outbound Message
> ---------------------------
> ID: 1
> Address: http://localhost:9000/CustomerService
> Encoding: UTF-8
> Content-Type: text/xml
> Headers: {SOAPAction=["findCustomer"], Accept=[*/*]}
> Payload: <soap:Envelope
> xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";><soap:Body><ns2:findCustomer
>
> xmlns:ns2="http://cxf.apache.org/demo/CustomerService/1/"/></soap:Body></soap:Envelope>
> --------------------------------------
> 20.01.2010 07:49:45 org.apache.cxf.interceptor.LoggingInInterceptor logging
> INFO: Inbound Message
> ----------------------------
> ID: 1
> Encoding: UTF-8
> Content-Type: text/xml; charset=utf-8
> Headers: {Content-Length=[194], Server=[Jetty(6.1.21)],
> content-type=[text/xml; charset=utf-8]}
> Payload: <soap:Envelope
> xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";><soap:Body><ns2:findCustomerResponse
>
> xmlns:ns2="http://cxf.apache.org/demo/CustomerService/1/"/></soap:Body></soap:Envelope>
> --------------------------------------
> List is null: null
> call findCustomer2()
> 20.01.2010 07:49:45
> org.apache.cxf.interceptor.LoggingOutInterceptor$LoggingCallback onClose
> INFO: Outbound Message
> ---------------------------
> ID: 2
> Address: http://localhost:9000/CustomerService
> Encoding: UTF-8
> Content-Type: text/xml
> Headers: {SOAPAction=["findCustomer2"], Accept=[*/*]}
> Payload: <soap:Envelope
> xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";><soap:Body><ns2:findCustomer2
>
> xmlns:ns2="http://cxf.apache.org/demo/CustomerService/1/"/></soap:Body></soap:Envelope>
> --------------------------------------
> 20.01.2010 07:49:45 org.apache.cxf.interceptor.LoggingInInterceptor logging
> INFO: Inbound Message
> ----------------------------
> ID: 2
> Encoding: UTF-8
> Content-Type: text/xml; charset=utf-8
> Headers: {Content-Length=[300], Server=[Jetty(6.1.21)],
> content-type=[text/xml; charset=utf-8]}
> Payload: <soap:Envelope
> xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";><soap:Body><ns2:findCustomer2Response
> xmlns:ns2="http://cxf.apache.org/demo/CustomerService/1/";><return
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:nil="true"/></ns2:findCustomer2Response></soap:Body></soap:Envelope>
> --------------------------------------
> List is null: null
> Server exiting
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