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From "Stefan Kühnel" <Stefan.Kueh...@gmx.net>
Subject Re: [Axis2] Handling sessions across two web services
Date Thu, 28 Aug 2008 19:33:41 GMT
Hello *,

I think the following patch against the current SVN head of Axis2 should fix the problem.

Any comments on the approach?

Thanks,
Stefan

Index: modules/transports/src/org/apache/axis2/transport/http/AbstractHTTPSender.java
===================================================================
--- modules/transports/src/org/apache/axis2/transport/http/AbstractHTTPSender.java	(revision
689928)
+++ modules/transports/src/org/apache/axis2/transport/http/AbstractHTTPSender.java	(working
copy)
@@ -418,6 +418,21 @@
                 StringBuffer buffer = new StringBuffer();
                 buffer.append(cookieString);
                 httpMethod.setRequestHeader(HTTPConstants.HEADER_COOKIE, buffer.toString());
+
+                // Set the cookie in the ServiceContext in case the server returns
+                // no Set-Cookie/Set-Cookie2 header for an already existing session
+                // and this is the first call in the session using this ServiceContext.
+                // 
+                // If we don't do this, we will get a WebServiceException ("NoMaintainSessionProperty")
+                // in org.apache.axis2.jaxws.BindingProvider.setupSessionContext();
+                // 
+                // If the server returns a cookie, the value we set here will be overriden
+                // in the method obtainHTTPHeaderInformation() above.
+                // 
+                // A setup where the described situation can happen is 
+                // when the user manually manages the session cookie independent
+                // from the lifetime of the ServiceContext/Proxy.
+                msgContext.getServiceContext().setProperty(HTTPConstants.COOKIE_STRING, buffer.toString());
             }
         }
 


-------- Original-Nachricht --------
> Datum: Mon, 18 Aug 2008 20:08:01 +0200
> Von: "Stefan Kühnel" <Stefan.Kuehnel@gmx.net>
> An: axis-dev@ws.apache.org
> Betreff: Handling sessions across two web services

> Hello *,
> 
> we're getting the error "Error: Maintain Session is enabled but none of
> the 
> session properties (Cookies, Over-written URL) are returned." when we're 
> trying to use the same HTTP session over two different web service client 
> proxies. Both proxies point to web services on the same webserver under 
> different paths (a la http://example.org/service1 and 
> http://example.org/service2). The Set-Cookie2 from the first service has a
> path of "/", so the cookie is valid for the second web service as well.
> 
> The problem is that even though we copy the cookie from the first proxy to
> the second proxy via the requestContext, Axis thinks there is no valid 
> session in the second proxy since the second web service returns no cookie
> via Set-Cookie.
> 
> The problem is, if I analyze this correctly, that the second proxy uses
> its 
> own ServiceContext, that is not shared with the ServiceContext of the
> first 
> proxy. The value we store in the requestContext is only used in the 
> request, but not copied into the ServiceContext. Therefore on return of
> the 
> call from the server, when Axis tries to set up the requestContext for the
> next call, this exception is raised, because it doesn't find the cookie in
> the ServiceContext. This set-up of the next  request happens in 
> org.apache.axis2.jaxws.BindingProvider.setupSessionContext(), where the 
> exception is raised.
> 
> The question now is, do you know of a workaround? Preferably one using
> only 
> JAX-WS features, so that we're not getting an explicit dependency on Axis.
> 
> In abstract terms, we would need the ability to
> * create the first proxy
>  * make the first call
>  * extract the session state (aka "sessionValue" in terms of the method 
> setupSessionContext) from the proxy
> * persist the session state
> 
> When making the call to the second web service, we want to
> * load the session state from our persistent store
> * create the second proxy
> * set the session state for this proxy
> * make the second call
> 
> Thanks,
> Stefan

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