Accessing static variable using GWT remote servlet

Question

Hi all,
Using GWT, I'm trying to call two methods which exist in a
RemoteService from my entrypoint class.
I have two methods within my remoteService servlet, method A and
method B.
Method A returns an int and sets an arraylist.
Method B returns the arraylist, myList.
I'm assuming that a single callback is associated with a single
servlet method? Is it possible to access the arraylist, which has been
set from calling method A, using the callback?
e.g.
//client code:
               MyServiceAsync myService = (MyServiceAsync)
GWT.create(MyService.class);
               AsyncCallback callback = new AsyncCallback(){
                  public void onSuccess(Object result) {
                  public void onFailure(Throwable caught) {
              myService.foo(callback);
// servlet code
public class MyServiceImpl extends RemoteServiceServlet implements
MyService{
       public static List myList = new ArrayList();
       public int A(){
               setB();
               return 10;
       public void setB(){
               // this adds five elements to a static arraylist, myList
       public List getB(){
               return myList;
}

Answer 1

Ok, frist solution (the better one) is that You can create a class that will both contain the int and the list. E.g.
public class MyObject implements Serializable {
private int value;
private List<Object> list;
//getters and settersThen You can set the values You're interested in the RemotServiceServlet and simply return this object - aync callbacks can return various types of objects (not only primitives) but under two conditions:
1) The object must implement the Serializable interface
2) The object must have public no argument constructor or no constructor at all.
Then in your client class You'll have:
MyServiceAsync myService = (MyServiceAsync) GWT.create(MyService.class);
AsyncCallback<MyObject> callback = new AsyncCallback<MyObject>(){
public void onSuccess(MyObject result) {
  result.getList();
  result.getInt();
public void onFailure(Throwable caught) {
myService.A(callback);
};The second solution is to invoke a method B callback in the result of A's callback:
MyServiceAsync myService = (MyServiceAsync) GWT.create(MyService.class);
AsyncCallback aCallback = new AsyncCallback(){
public void onSuccess(Object result) {
   //here You get the in value
   AsyncCallback bCallback = new AsyncCallback(){
    public void onSuccess(Object result) {
     //here You get the list
    public void onFailure(Throwable caught) {
    myService.B(bCallback);
public void onFailure(Throwable caught) {
myService.A(aCallback);Hope this is clear and will help You. (Remember also the use generics!)