hi, I want to make a webmethod that returns an object list

for example:

//class Person has a "name" attribute...

 @WebMethod
 public ArrayList getPool() {
 ArrayList array=new ArrayList();
 for(int i=0;i<5;i++){
 Person person=new Person("name"+i);
 array.add(person);
 }
 return array;
 }

when I run any webservice like this the console server throws an exception as follows:

ERROR [RequestHandlerImpl] Error processing web service request
org.jboss.ws.WSException: javax.xml.ws.WebServiceException: javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.bind.JAXBException: class org.jboss.soa.esb.samples.quickstart.model.
Person nor any of its super class is known to this context.]
 at org.jboss.ws.WSException.rethrow(WSException.java:68)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:310)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:189)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:122)
 at org.jboss.wsf.stack.jbws.EndpointServlet.service(EndpointServlet.java:84)
...
...
...

Can anybody help me?
thanks in advance,
Atriano