Hello,
I hope everyone is fine. I have started to use RPC’s with GWT. I have
worked through the examples and tutorials and I believe understand how
it works. Now, I have created my own class to serialize and use in an
asynchronous callback so that the client can receive data about a
purchase from a server. Everything compiles properly and the onSuccess
method gets executed, but when I try to read the received data, it
only is “Null”. Does anyone have an idea what might be wrong with my
code?
Thanks a lot.
Best regards,
Bastian
Here is my code:
Class to store the data in client package:
import java.io.Serializable;
@SuppressWarnings("serial")
public class Purchase implements Serializable {
private String username;
private String headline;
private String description;
public Purchase()
{
}
public String getUsername(){
return username;
}
public String getHeadline(){
return this.headline;
}
public String getDescription(){
return description;
}
public void setUsername(String username){
this.username = username;
}
public void setHeadline(String headline){
this.username = headline;
}
public void setDescription(String description){
this.description = description;
}
}
Service Interface in client package:
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
@RemoteServiceRelativePath("collectivePurchase")
public interface CollectivePurchaseService extends RemoteService {
Purchase getCollectivePurchase(String username);
}
Async Interface in the client package:
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface CollectivePurchaseServiceAsync {
void getCollectivePurchase(String username, AsyncCallback<Purchase>
callback);
}
Server implementation:
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
@SuppressWarnings("serial")
public class CollectivePurchaseServiceImpl extends
RemoteServiceServlet implements CollectivePurchaseService {
public Purchase getCollectivePurchase(String username) {
com.biddrocket.secretrocket.client.Purchase collective = new
com.biddrocket.secretrocket.client.Purchase();
collective.setUsername("brian");
collective.setHeadline("motor bike");
collective.setDescription("most amazing bike");
return collective;
}
}
Client entry point:
CollectivePurchaseServiceAsync collectivePurchaseService =
(CollectivePurchaseServiceAsync)
GWT.create(CollectivePurchaseService.class);
collectivePurchaseService.getCollectivePurchase("brian ley", new
AsyncCallback<Purchase>() {
public void onFailure(Throwable
caught) {
Window.alert(caught.getLocalizedMessage());
}
@Override
public void onSuccess(Purchase
result) {
update(result);
}
});
//Make the call to the RPC to get the headline for the gallery
showcase
//collectivePurchaseService.getHeadline("brian", callback);
}
public void update(Purchase collective){
Window.alert(collective.getHeadline());
}
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