Custom Front End Callback

Hi,
I'm customizing the LoginLogout Front End CallBack in TestStand 2010, it works when I call it from my custom OI (LV2010). But when I launch TestStand, I get an error message (the error code doesn't seem to be documented). I cannot log in or out. If I remove the callback from the public directory, and use the NI callback everything's back to normal.
Does anyone know what I am doing wrong? or can reproduce the error?
I have LV 2010 f2 installed (not SP1 yet)
Thank you,
Rodéric L
Certified LabVIEW Architect
Solved!
Go to Solution.
Attachments:
erreur.JPG ‏101 KB
FrontEndCallbacks.seq ‏6 KB
Teststand - Add User.vi ‏51 KB

I solved my problem simplifying the VI, and moving my variable to the end of the container, I also moved to LV2010 SP1. I get some reference leak issues and sometimes there is a pop up coming saying the sequence file wasn't properly relased
Rodéric L
Certified LabVIEW Architect

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Help with EJB Arch: Synchronous front-end -- Asynchronous back-end

Hi folks, We are developing an application with the following characteristics: - users can invoke requests on our appl and they will expect a quick response - to obtain the information requested by the user, our application talks with Tibco using RV. This communication follows a pub/sub messaging paradigm and is asynchronous. - thus, we have a synchronous req/resp front-end and an asynch back-end.
We would like some advice as to the best way of architecting this application. Here is our approach. Please critic and suggest alternatives.
1. Consider an user who has requested something from our app. 2. The user will be using a JSP based front-end. (S)he submits the request on a form and a servlet is driven. 3. The servlet uses a session EJB and invokes one of its methods, which handles some business-specific logic. 4. The method in the session EJB then instantiates a helper class. 5. A method on our helper class is now driven. This method sends a message to Tibco and it provides a callback method in the helper class. 6. The method in the helper class blocks the thread - basically, it waits. 7. Meanwhile, Tibco does the processing and invokes the callback method (in the helper class) with the result. 8. In the callback method, the data sent by Tibco is stored in member variables of the helper class. 9. The callback method wakes up the blocking thread. 10. The method in step 6 wakes up and returns the information to the session EJB. 11. The session EJB returns the information to the invoking servlet. 12. The servlet provides the information back to the user.
The version of Tibco-RV that we are using is not JMS compliant.
We keep hearing that threads should be handled very carefully in an EJB container environment, so we would like to know if the way we are handling the thread in the helper class is okay. Could we remove the helper class and do the same thread-handling in the session EJB itself?
Can we use JMS in this solution even though our Tibco-RV does not support JMS?
Tools: Weblogic App Server 6.1, JBuilder 5.0.
Thanks for your advice and suggestions!

Let me start off by mentioning that Sonic MQ (an excellent JMS server) now provides a bridge for TIB/Rendezous. I am also wrestling with a simliar issue, something that requires threading at the servlet or ejb level, and have given some thought to using JMS. My concern was that JMS is an asynchronous process so it's model does not fit well with the synchronous front end. Technically I can see a few ways to implement it but architecturally I am not convinced that they are sound. You could send a message from the session bean to the TIB via SonicMQ and have a JMS message bean registered as a listener for messages from the TIB, again via SonicMQ. The JMS bean could update a static class or singleton which your session checks but you still have the issue of making the session bean wait on that event.
I'll do a bit more digging and see if there's a design pattern available for this situation.
-Dat

Problem with CRM 2011 web front end cluster

Hi.
We have a CRM 2011 (RU17) environment with a SQL DB server and 2 web front end CRM server in a cluster.
Since few days (about 10) it seems that one of the 2 nodes is not working, and since yesterday many users report access problems when calling the application by cluster name - as usual since we deployed CRM 1 year ago.
I tried myself, and I can run the application by cluster name without problems. If it try the separate notes addresses, one of them works, the other doesn't.
I checked the 2 web front end servers, and are (or seem) both properly configured, with all patches installed.
Following the information I got from Event viewer. Any suggestion welcomed!
Many thanks and Best regards
On the 'faulty' server I have different errors at event viewer level:
Faulting application name: Microsoft.Crm.Sandbox.HostService.exe, version: 5.0.9690.4150, time stamp: 0x53559982
Faulting module name: KERNELBASE.dll, version: 6.1.7601.18229, time stamp: 0x51fb1677
Exception code: 0xe0434352
Fault offset: 0x000000000000940d
Faulting process id: 0x6f8
Faulting application start time: 0x01cf8f93aa9a7ff8
Faulting application path: C:\PROGRA~1\MICROS~4\Server\bin\Microsoft.Crm.Sandbox.HostService.exe
Faulting module path: C:\Windows\system32\KERNELBASE.dll
Report Id: f5019a68-fb86-11e3-9f21-005056853970
Application: Microsoft.Crm.Sandbox.HostService.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Runtime.InteropServices.COMException
Stack:
   at Microsoft.Crm.Sandbox.HostService.InitializeThreadProc(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
The Sandbox Host service has encountered an unexpected error and has stopped.
Source: Microsoft.Crm.Sandbox.HostService.exe (1784)
Error: System.Runtime.InteropServices.COMException (0x8007203A): The server is not operational.
   at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
   at System.DirectoryServices.DirectoryEntry.Bind()
   at System.DirectoryServices.DirectoryEntry.get_AdsObject()
   at System.DirectoryServices.PropertyValueCollection.PopulateList()
   at System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName)
   at System.DirectoryServices.PropertyCollection.get_Item(String propertyName)
   at Microsoft.Crm.SecurityUtils.GetSidFromAD(Guid objectGuid)
   at Microsoft.Crm.Sandbox.SandboxHost.SetPrivilegeUserGroupId(Guid privilegeUserGroupId)
   at Microsoft.Crm.Sandbox.HostService.InitializeThreadProc(Object stateInfo)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
On the 'running' server event viewer I only have one error, related to mail router:
#23379 - Could not verify the version of Microsoft Dynamics CRM at http://alkcg106.d30.intra:5555/AkzoNobelIndustrialCoatings. There was no endpoint listening at http://alkcg106:5555/AkzoNobelIndustrialCoatings/XRMServices/2011/Organization.svc that could
accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.

Apologize for not having indicated here the resolotion I got thanks to MS support...
We enabled the trace and we got
a http error page stating maxQueryStringLength was insufficient. We changed the maxQueryStringLength and QueryString values in the CRM web.config value to 10240.
We also noticed an error related to the DC being unavailable. We checked in the CRM registry hive and see in the non-working server you had a PreferredDc key pointing to “AMDNAD”. On pinging
AMDNAD we see it is not reachable. We removed the PreferredDc key and after iisreset we can navigate to crm.

Custom Front End Callback

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