AMF channel return object format

Question

Hey,
I am working with BlazeDS and JBoss 5.
In Jboss I have AuthentificationFilter  before  Remote Objects... So each request must pass throw this filter.
On server side:
In the filter I am checking login session data and if it is ok ,it passes to Remote Object.
If not I make following :
httpResponse.getWriter().write("Session Invalid");
On flex side :
I get fault result from server, and I don't see "Session invalid" string. I have the fault of Bad Version, because  it is not AMF Channel , I quess.
The question is how can I get String from this filter ???
Thanks a lot!

Answer 1

Hello,
I wanted to start a new post but when reading this post, I think it is the same kind of issue I am facing for a few days now.
I am using WebSphere (v6.1) and Java (EJB 2...) with Flex 3.4 as the frontend talking to BlazeDS.
In some cases based on properties, my application (EJBs) should still be available but the UI (Flex) should be disabled.
Throwing java exception in the (java) services methods works just fine since you can get the exception in Flex through the fault rootCause but I need/want to block the Flex app/calls before that...
To do so, I thought that a (java) ServletFilter added in the web.xml would be the right place to process this check.
If the properties says that the UI should not be accessed before launching the application frontend it is working just great. Indeed I am calling a servlet that will display the flash <object ...> but the filter is able to return an HTML information page...
if the properties are set later on, when the flex app is already running, I am facing the issue!
I tried several things but I can't get a usable message on flex side...
In my "doFilter" method, I did try this:
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
          throws IOException, ServletException {
     // Cast the request & response
     HttpServletRequest request = (HttpServletRequest) req;
     HttpServletResponse response = (HttpServletResponse) res;
     // Try to send an exception that I could catch/match (at least the message) on the flex side...
     response.resetBuffer();
     response.setContentType("application/x-amf");
     MessageException me = new MessageException("Application closed");
     ErrorMessage em = me.getErrorMessage();
     FlexClient flexClient = FlexContext.getFlexClient();
     em.setClientId(flexClient.getId());
     Amf3Output amfOutput = new Amf3Output(SerializationContext.getSerializationContext()); 
     amfOutput.setOutputStream(response.getOutputStream()); 
     amfOutput.writeObject(em);
     amfOutput.flush(); 
     amfOutput.close(); 
     return;
When doing so, I get an "Unsupported AMF version 2689" in Flashbug/Firebug under Firefox.
And I first tried a much more simple thing (in the "doFilter" method) such as :
throw new UnavailableException("Application closed");
or
res.sendError(HttpServletResponse.SC_TEMPORARY_REDIRECT);
return;
and I get this error :
faultCode:Client.Error.DeliveryInDoubt faultString:'Channel disconnected'
faultDetail:'Channel Disconnected before an acknowledement was received'
I really hope someone will be able to help us since it does not look like a crazy use case.
I have also tried to override the MessageBrokerServlet but I am facing the same issues...
Thank you very much for your help and keep on doing great job on BlazeDS!!!