GWT WARNING: No file found for: /com.mycompany.project.ImageViewer/GreetingService

Question

Don't connect to the server... it's a project in last gwt eclipse

on click to button in gwt:

greetServer(textToServer,
                        new AsyncCallback<String>() {
                            public void onFailure(Throwable caught) {
                                // Show the RPC error message to the user
                                dialogBox
                                        .setText("Remote Procedure Call - Failure");
                                serverResponseLabel
                                        .addStyleName("serverResponseLabelError");
                                serverResponseLabel.setHTML(SERVER_ERROR);
                                dialogBox.center();
                                closeButton.setFocus(true);
                            }

                            public void onSuccess(String result) {
                                dialogBox.setText("Remote Procedure Call");
                                serverResponseLabel
                                        .removeStyleName("serverResponseLabelError");
                                serverResponseLabel.setHTML(result);
                                dialogBox.center();
                                closeButton.setFocus(true);
                            }
                        });

my gwt server:

    public String greetServer(String input) throws IllegalArgumentException {
        // Verify that the input is valid. 
        if (!FieldVerifier.isValidName(input)) {
            // If the input is not valid, throw an IllegalArgumentException back to
            // the client.
            throw new IllegalArgumentException(
                    "Name must be at least 4 characters long");
        }

        String serverInfo = getServletContext().getServerInfo();
        String userAgent = getThreadLocalRequest().getHeader("User-Agent");

        // Escape data from the client to avoid cross-site script vulnerabilities.
        input = escapeHtml(input);
        userAgent = escapeHtml(userAgent);

        return "Hello, " + input + "!<br><br>I am running " + serverInfo
                + ".<br><br>It looks like you are using:<br>" + userAgent;
    }

it's my gwt servise:

@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
    String greetServer(String name) throws IllegalArgumentException;
}

gwt serviseAsyn file:

public interface GreetingServiceAsync {
    void greetServer(String input, AsyncCallback<String> callback)
            throws IllegalArgumentException;
}


web xml

  <!-- Servlets -->
  <servlet>
    <servlet-name>greetServlet</servlet-name>
    <servlet-class>kill.server.GreetingServiceImpl</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>greetServlet</servlet-name>
    <url-pattern>/hello123/greet</url-pattern>
  </servlet-mapping>

  <!-- Default page to serve -->
  <welcome-file-list>
    <welcome-file>Hello123.html</welcome-file>
  </welcome-file-list>

on click button - the server does not return value, because don't find file - why?

Jun 27, 2012 11:12:13 AM com.google.appengine.tools.development.LocalResourceFileServlet doGet
WARNING: No file found for: /com.mycompany.project.ImageViewer/GreetingService

what to do?

Answer 1

In your web.xml file you map the service as /hello123/greet:

<servlet-mapping>
    <servlet-name>greetServlet</servlet-name>
    <url-pattern>/hello123/greet</url-pattern>
</servlet-mapping>

while the error shows it is trying to load the default of /modulename/serviceinterfacename, or /com.mycompany.project.ImageViewer/GreetingService. Two options are available:

1. Change the web.xml entry to use the default url that the RPC interface expects
2. Configure the remote service to load from your custom path

Both of theses are discussed briefly at https://developers.google.com/web-toolkit/doc/latest/DevGuideServerCommunication, along with other RPC setup details.

For the second option, this usually looks like this:

MyServiceAsync service = GWT.create(MyService.class);
((ServiceDefTarget)service).setServiceEntryPoint("/hello123/greet");
service.methodName(...