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From "Marc Baumgartner (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CXF-2627) Return Type List gets null on client if an empty list is returned
Date Wed, 20 Jan 2010 07:10:03 GMT

     [ https://issues.apache.org/jira/browse/CXF-2627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marc Baumgartner updated CXF-2627:
----------------------------------

    Description: 
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


  was:
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



> Return Type List gets null on client if an empty list is returned
> -----------------------------------------------------------------
>
>                 Key: CXF-2627
>                 URL: https://issues.apache.org/jira/browse/CXF-2627
>             Project: CXF
>          Issue Type: Bug
>          Components: JAXB Databinding
>    Affects Versions: 2.1.8
>         Environment: JSE 1.5 on Win XP
>            Reporter: Marc Baumgartner
>            Priority: Critical
>         Attachments: EmptyListExample.zip
>
>
> 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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