<?xml version='1.0' encoding='UTF-8'?><S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/"><S:Body>

javax.xml.bind.JAXBException: class java.util.LinkedList nor any of its super class is known to this context

@XmlElementWrapper(name="error_list")
@XmlElement(name="error")

@WebService()
public class TechnicalSOAP {
   @WebMethod
   public Object technicalMethods(){
      List<Device> devicesList = new LinkedList();
      devicesList.add(new Device);
      return devicesList;
}

public class Device(){
   private Integer id;
   public void setId(Integer id){
      this.id = id;
   }
   public void getId(){
      return this.id;
   }
}