I am doing something like
*
public* *interface* UtilService *extends* RemoteService {
Map<String, Map<String, RateCard[]>> fetchdata (Customer objCustomer);
}
*
public* *interface* UtilServiceAsync {
*
void* fetchData(Customer objCustomer ,AsyncCallback<Map<String, Map<String,
Card[]>>> callback);
}
and this works without any hassles.
I have even tried ArrayList ..works without a problem..
but make sure all the attributes of list have implemented Serializable or
isSerilizable interface.
Thanks
Sudeep
On Tue, Oct 20, 2009 at 9:55 AM, Ralf B <[email protected]> wrote:
>
> Your return value is an ArrayList, not a String - so much about
> compatibility of types. However I am not sure if you can actually
> return an ArrayList (due to the requirement to have implemented the
> Serializable interface). Working with String[] directly will certainly
> work but would require you to turn your return value into a static
> String array.
>
> Ralf
>
>
> On Mon, Oct 19, 2009 at 4:54 PM, [email protected]
> <[email protected]> wrote:
> >
> > I have an implementation method that I want to return an
> > arraylist<String> from the DB.
> >
> > Here is the method:
> >
> > public ArrayList<String> greetClients() {
> > String result = "";
> > Connection conn = null;
> > Statement st = null;
> >
> > String sql = "select distinct dealernumber from
> financialaccount";
> > ArrayList<String> clients = new ArrayList<String>();
> > try{
> > Class.forName("com.mysql.jdbc.Driver");
> > conn =
> DriverManager.getConnection("jdbc:mysql://localhost:3306/
> > DB", "user", "password");
> > st = conn.createStatement();
> > ResultSet rs = st.executeQuery(sql);
> > while(rs.next()){
> > if(rs.getString(0)!=null){
> > clients.add(rs.getString(0));
> > }
> >
> > }
> >
> > //System.out.println(result);
> > st.close();
> > conn.close();
> > }catch(Exception e){
> > e.printStackTrace();
> > }
> >
> >
> > return clients;
> > }
> >
> > When I try to create the methods in the other classes; in the Service
> > and ServiceAsync class I get this error:
> >
> > Return type is not compatible with the AsyncCallback parameter from
> > GreetingServiceAsync.getClients
> > Here is are my classes:
> >
> > GreetingService.java
> > package com.appcrown.dashboard.client;
> >
> > import java.util.ArrayList;
> > import java.util.List;
> >
> > import com.google.gwt.user.client.rpc.RemoteService;
> > import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
> >
> > /**
> > * The client side stub for the RPC service.
> > */
> > @RemoteServiceRelativePath("greet")
> > public interface GreetingService extends RemoteService {
> > String greetServer(String name);
> > ArrayList<String> getClients(); //gives error
> > }
> >
> >
> >
> > GreetingServiceAsync.java
> > package com.appcrown.dashboard.client;
> >
> > import java.util.ArrayList;
> >
> > import com.google.gwt.user.client.rpc.AsyncCallback;
> >
> > /**
> > * The async counterpart of <code>GreetingService</code>.
> > */
> > public interface GreetingServiceAsync {
> > void greetServer(String input, AsyncCallback<String> callback);
> > void getClients(AsyncCallback<String> callback); //gives error
> > }
> >
> >
> >
> >
> > >
> >
>
> >
>
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