RemoteService Error 403: FORBIDDEN on development server?

[venk]

Hi all -

I'm stumped. I keep getting a Error 403 that causes the onFailure
method to be invoked in response to a call to a RemoteServiceAsync
interface method. Not sure if that makes sense, but I'll put the code/
xml/etc. here, along with the StackTrace and you'll see what I mean I
hope.

Basically, breakpoints in the ServiceImpl on the server side do NOT
get tripped, but a breakpoint in the onFailure method of the callback
does. Sorry for the occasional "censoring" of names of modules,
packages, etc. But, it's pretty much all there. If I comment out the
entire call to the greetingService and just go straight to
"dosomething", everything works fine.

This GreetingService is meant to catch the request for the URL to find
out if the user is logged in or not and return the appropriate login/
logout URL and any available user data if logged in. So it would be
nice to get it working.

Anyone that can help with this? Thanks in advnace!

-- V


***** GreetingService.java *****

import java.util.HashMap;

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("")
public interface GreetingService extends RemoteService {
HashMap<String, String> greetServer(String senderURL);
}


***** GreetingServiceAsync.java *****

import java.util.HashMap;

import com.google.gwt.user.client.rpc.AsyncCallback;

/**
* The async counterpart of <code>GreetingService</code>.
*/
public interface GreetingServiceAsync {
void greetServer(String senderURL, AsyncCallback<HashMap<String,
String>> callback);
}


***** GreetingServiceImpl.java *****

import java.util.HashMap;

import com.zeo.dashboard.client.GreetingService;
import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

/**
* The server side implementation of the RPC service.
*/
@SuppressWarnings("serial")
public class GreetingServiceImpl extends RemoteServiceServlet
implements GreetingService {

public HashMap<String, String> greetServer(String senderURL) {
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();

HashMap<String, String> response = new HashMap<String, String>();

if (user == null) {
response.put("label", "Login");
response.put("url", userService.createLoginURL(senderURL));
}
else {
response.put("label", "Logout " + user.getEmail());
response.put("email", user.getEmail());
response.put("name", user.getNickname());
response.put("domain", user.getAuthDomain());
response.put("url", userService.createLogoutURL(senderURL));
}

return response;
}
}


***** web.xml *****

<servlet>
<servlet-name>greetServlet</servlet-name>
<servlet-class>[server.package.name].GreetingServiceImpl</servlet-
class>
</servlet>

<servlet-mapping>
<servlet-name>greetServlet</servlet-name>
<url-pattern>/[modulename]</url-pattern>
</servlet-mapping>


***** GreetingClient.java *****

import java.util.HashMap;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;

/**
* Entry point classes define <code>onModuleLoad()</code>.
*/
public class GreetingClient implements EntryPoint {
/**
* Create a remote service proxy to talk to the server-side Greeting
service.
*/
private final GreetingServiceAsync greetingService = GWT.create
(GreetingService.class);

/**
* This is the entry point method.
*/
public void onModuleLoad() {
greetingService.greetServer(GWT.getModuleBaseURL(), new
AsyncCallback<HashMap<String, String>>() {
public void onFailure(Throwable caught) {
Window.alert("Error accessing user service: " +
caught.getMessage());
caught.printStackTrace();
}

public void onSuccess(HashMap<String, String> response) {
dosomethingwithresponse(response);
}
});
}
}


***** [appname].gwt.xml *****

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.6.4//
EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.6.4/distro-
source/core/src/gwt-module.dtd">
<module rename-to='[modulename]'>

<!-- Inherit the core Web Toolkit stuff. -->
<inherits name='com.google.gwt.user.User'/>

<inherits name="com.google.gwt.i18n.I18N"/>
<inherits name='com.google.gwt.xml.XML'/>

<inherits name='com.google.gwt.user.theme.standard.Standard'/>
<!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
<!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/> -->

<!-- Other module inherits -->

<!-- Specify the app entry point class. -->
<entry-point class='[client.package.name].GreetingClient'/>


***** StackTrace from Error *****

com.google.gwt.user.client.rpc.StatusCodeException: <html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1"/>
<title>Error 403 </title>
</head>
<body><h2>HTTP ERROR: 403</h2><pre>FORBIDDEN</pre>
<p>RequestURI=/[modulename]/</p><p><i><small><a href="http://
jetty.mortbay.org/">Powered by Jetty://</a></small></i></p><br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>
<br/>

</body>
</html>

at
com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived
(RequestCallbackAdapter.java:192)
at com.google.gwt.http.client.Request.fireOnResponseReceivedImpl
(Request.java:264)
at com.google.gwt.http.client.Request.fireOnResponseReceivedAndCatch
(Request.java:236)
at com.google.gwt.http.client.Request.fireOnResponseReceived
(Request.java:227)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod
(IDispatchImpl.java:126)
at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke
(IDispatchProxy.java:155)
at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke
(IDispatchImpl.java:294)
at com.google.gwt.dev.shell.ie.IDispatchImpl.method6
(IDispatchImpl.java:194)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6
(COMObject.java:117)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
at com.google.gwt.dev.SwtHostedModeBase.processEvents
(SwtHostedModeBase.java:235)
at com.google.gwt.dev.HostedModeBase.pumpEventLoop
(HostedModeBase.java:558)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

[venk]

So, for anyone who is looking at this, I tried an experiment. I
rewrote the server as an HttpServlet returning a JSON string with the
same data as the hashmap, and I let the client parse it and send it to
dosomething. Here are some observations and a bit of information that
narrows down the problem.

1. I was getting an error when trying to call GWT.getModuleBaseURL()
on the server side, so I send the value of that call as a parameter
"sender" in the GET request.
2. After that and a little tweaking, I end up with the ability to "log
in", but...
3. ...the redirect to the url "lcoalhost:port/modulename" which is the
value of getModuleBaseURL() results in the error 403 I described
below.
4. As a test, I changed the sender to be the Host URL + entry html
file, which worked for the redirect, but...
5. ...didn't register the login.

Any thoughts or suggestions are welcome.

Thanks.

-- V