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, michael.d.clay...@hotmail.com
<michael.d.clay...@hotmail.com> 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
> }
>
>
>
>
> >
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to google-web-toolkit@googlegroups.com
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en
-~----------~----~----~----~------~----~------~--~---
