Is WebServiceContext injection thread-safe?

Question

Hi,

I have a web service(Netbeans 6.9.1,Glassfish 3.0.1) with webservicecontext injection. I want to know if this class is thread-safe if I use @Singleton annotation.

@WebService()
@Singleton()
public class Proves {
   @Resource
   WebServiceContext wsContext;

   @WebMethod(operationName = "feralgo")
   public String feralgo(@WebParam(name = "parametro1") String parametro1) {
    //TODO write your implementation code here:

    //Get host and ip client
    String nomClient,ipClient;
    MessageContext msgContext = wsContext.getMessageContext();
    HttpServletRequest srvlRequest = (HttpServletRequest) msgContext.get(MessageContext.SERVLET_REQUEST);
    nomClient = srvlRequest.getRemoteHost();
    ipClient = srvlRequest.getRemoteAddr();

    //Get user authenticated
    String usuari;
    usuari = wsContext.getUserPrincipal().getName();

    return nomClient + " " + ipClient + " " + usuari;
   }
 }