@WebService(serviceName="Hellow")
@WebServlet(name="Hellow", urlPatterns={"/Hellow"})
public class HellowServiceImpl {
  @EJB private DocumentManager manager // @Stateless

  @WebMethod
  public void createDocument(byte[][] xmlList) throws HellowException {
     for(byte[] xml : xmlList)
         manager.createDocument(xml);
  }
}

@Resource private UserTransaction utx;

try {
  utx.begin();
  manager.createDocument(xml);
  utx.commit();
} catch(Exception e) {
  utx.rollback():
  throw new HellowException("ошибка", e);
}

@Stateless
public class DocumentManagerImpl implements DocumentManager {
...
}

@Policies({
  @Policy(uri = "policies/policy.xml")
})
@WebService
@GZIP
public interface HellowService {
  @WebMethod
  public void createDocument(
    @WebParam("xmlList") byte[][] xmlList) throws HellowException;
  ...
}

@WebService(
  wsdlLocation = "wsdl/HellowService.wsdl",
  endpointInterface = "foo.HellowService",
  serviceName = "Hellow")
@EndpointProperties({
  @EndpointProperty(key = "ws-security.validate.token", value = "false")
})
@WebServlet(name="Hellow", urlPatterns={"/Hellow"})
public class HellowServiceImpl implements HellowService {
  @Resource private WebServiceContext wsCtx;
  ...
}