error when I use GWT RPC
- by Sebe
Hello everyone...
I have a problem with Eclipse when I use an RPC..
If I use a single method call it's all in the right direction but if I add a new method to handle the server I get the following error:
com.google.gwt.core.client.JavaScriptException: (null): null
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:237)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeBoolean(ModuleSpace.java:184)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeBoolean(JavaScriptHost.java:35)
at com.google.gwt.user.client.rpc.impl.RpcStatsContext.isStatsAvailable(RpcStatsContext.java)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:221)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
at java.lang.Thread.run(Thread.java:619)
Can I have more services in an asynchronous call right? Where am I wrong?
This is my implementation MyService:
package de.vogella.gwt.helloworld.client;
import com.google.gwt.user.client.rpc.RemoteService;
public interface MyService extends RemoteService {
//chiamo i metodi presenti sul server
public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann);
public void setWeb(String userCorrect,String query, String titolo,String snippet,String url);
}
MyServiceAsync
package de.vogella.gwt.helloworld.client;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface MyServiceAsync {
void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann,AsyncCallback<Void> callback);
void setWeb(String userCorrect,String query, String titolo,String snippet,String url, AsyncCallback<Void> callback);
}
RPCService:
package de.vogella.gwt.helloworld.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.ui.FlexTable;
public class RPCService implements MyServiceAsync {
MyServiceAsync service = (MyServiceAsync) GWT.create(MyService.class);
ServiceDefTarget endpoint = (ServiceDefTarget) service;
public RPCService()
{
endpoint.setServiceEntryPoint(GWT.getModuleBaseURL() + "rpc");
}
public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann,AsyncCallback callback)
{
service.creaXML(nickname, pass, email2, gio, mes, ann, callback);
}
public void setWeb(String userCorrect,String query, String titolo,String snippet,String url,AsyncCallback callback) {
service.setWeb(userCorrect,query, titolo,snippet,url,callback);
}
}
MyServiceImpl
package de.vogella.gwt.helloworld.server;
import java.io.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import de.vogella.gwt.helloworld.client.MyService;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.google.gwt.xml.client.Element;
import com.google.gwt.xml.client.NodeList;
public class MyServiceImpl extends RemoteServiceServlet implements MyService {
//metodo che inserisce il nuovo iscritto
public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann){
.......
}
public void setWeb(String userCorrect,String query, String titolo,String snippet,String url) {
.....
}
In the app in client-side I do
RPCService rpc2 = New RPCService()
rpc2.setWeb(..,...,...,...,callback);
and
RPCService rpc = New RPCService()
rpc.creaXML(..,...,...,...,callback); (in other posizions in the code...)
and..
AsyncCallback callback = new AsyncCallback()
{
public void onFailure(Throwable caught)
{
Window.alert("Failure!");
}
public void onSuccess(Object result)
{
Window.alert("Successoooooo");
}
};
Web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<!-- Servlets -->
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>De_vogella_gwt_helloworld.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>rPCImpl</servlet-name>
<servlet-class>de.vogella.gwt.helloworld.server.MyServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>rPCImpl</servlet-name>
<url-pattern>/de_vogella_gwt_helloworld/rpc</url-pattern>
</servlet-mapping>
</web-app>
Thank you all for your attention
Sebe
