The WCF service to which my send & receive ports are configured, is not available; thus I am getting an EndPoint not found exception. How do I catch this exception in the middle of my orcehstration and flow towards a clean exit from the orchestration? I should be able to capture the detail and invoke a class lib (through Expression shape).
I tried catching the FaultContract, System.Exception in the scope from which I am sending the request to port. But in vain.
Your have to play by the rules first!
In order to catch an exception within your scope block in Biztalk while using a WCF request-response port, you might have to do the following...
Set the retry-count to 0 on your physical request-response port which you use to bind.
Enable the flag Delivery Notification to 'Transmitted' on your logical request-response port within the orchestration.
Catch the "System.Web.Services.Protocols.SoapException" exception and handle it as your please.
Hope this helps.
References: Have a look at my article in code project Code Project
Related
What is the concept behind exception handling in Spring Integration or any other EAI framework: Are they treated as a Message?
Lets say that a JMS timeout exception was thrown from jms-outbound-gateway. Now it has to be moved all the way upto the parent custom gateway addEmployeeGateway which defines a method called addEmployee which throws a custom exception called SystemDownException. These two components are connected through request and reply channels and thats the only medium of communication. Does it mean that Exceptions are also treated as messages?
Also, if i had to map the JMS timeout exception to my custom exception SystemDownException and rethrow the SystemDownException how and where would i achieve this. I dont want to use an errorchannel.
The general mechanism for handling exceptions is an error-channel on the inbound (or some intermediate) endpoint; the ErrorMessage payload has failedMessage and cause properties.
The mechanism is similar to try {...} catch {...} in Java.
I dont want to use an errorchannel.
Alternatively, you can configure a custom request handler advice on the JMS outbound gateway; there, you can do whatever you want, including throwing your SystemDownException after catching an exception on callback.execute().
I have a problem in catching the exceptions in my spring integration application.
Flow of operations in my application.
Http:inbound gateway which receives the request (error-channel defined to my custom error channel)
Service Activator for basic validations (Exceptions which are thrown from here are handled by error-channel defined on the GW)
splitter
Aggregator
Exceptions on my splitter or Aggregator are not handled by my error channel. why?
Steps taken:
I added a chain and included a header enricher and specified an error channel just before the splitter.
After this, any exception on my splitter is handled by my error channel mentioned in the header enricher.
<chain input-channel="invitations">
<header-enricher>
<error-channel ref="failed-invitations" />
</header-enricher>
<int:splitter ref="payloadSplitter" />
</chain>
But the same doesnt work when do the same on my Aggregator. why?
Whenever there is an exception in my code, it retries and gets executed more than one time. why?
I have a "errorChannel" defined which logs the exceptions. it doesnt work.
I know the thread is too old, but I was also facing a similar issue and found I declared error-channel in header-enricher but not provide 'overwrite="true"' as a parameter. And after providing 'overwrite="true"'it is working as needed. I am surprised why spring integration does not provide an overwrite=true by default.
Let us know this is what solution you did in your old code? So everyone can find out the solution for such a scenario.
I created a custom component for a proprietary service. If this service is down i get noticed via a call of a callback function. I am throwing a custom exception at this point.
Sending exchanges to the producer/ consumer will yield no errors or exceptions (all seems to fine).
So i need to implement an emergency stop if my custom exception is thrown. I read a bit about exception handling in camel. I think i need a context-scoped onException(MyException.class).??? but what then?
Is this working on exceptions that are called without relation to an exchange? If this is working how to handle it. I want to stop certain routes in this case.
here you can find to stop routes from a route: http://camel.apache.org/how-can-i-stop-a-route-from-a-route.html.
If you do the call of the proprietary service in a route you do have an exchange btw.
kind regards,
soilworker
I created a little workaround: I set a boolean i the callback method is called. On each call of process i check this boolean and if true i throw an exception.
With this the exception is within normal camel exception handling and onException could be used.
I'm starting to use Spring integration and I don't know how to resolve this situation if it's possible.
I would like to 'catch' automatically every Exception who could happend in the service activators of my application and send this errors to a dedicated queue.
Gateway is not a solution because I need some custom code so I have to use service activator elements if I have correctly understood the principle.
I thought that something like would be ok:
<jms:outbound-channel-adapter channel="errorChannel"
connection-factory="jmsConnectionFactory" destination="oneErrorQueue"/>
That is not working. I don't know if errorChannel is used by spring integration for putting the errors in indeed.
thank you, It seems to work.
I've put the transformer listening to the error-channel of the inbound component starting the flow and it gets the MessagingException when an error happens in service activator. Now the problem is that this error doesn't arrive to my queue. I let you see the code:
<jms:message-driven-channel-adapter
channel="input-channel" concurrent-consumers="1"
max-concurrent-consumers="3" connection-factory="jmsConnectionFactory"
transaction-manager="jtaTransactionManager" destination="myQueue" error-channel="myErrorChannel"/>
<transformer input-channel="myErrorChannel" output-channel="create-error-channel" ref="errorTransporter" method="transform"/>
<jms:outbound-channel-adapter channel="create-error-channel"
connection-factory="jmsConnectionFactory" destination="creationErrorQueue" extract-payload="true"/>
...
And the transformer:
public class ErrorTransporter {
#Transformer
public Message<CreateCustomerOrder> transform(MessagingException exception) {
return (Message<CreateCustomerOrder>) exception.getFailedMessage();
}
}
Thanks in advance for helping!
Add an error-channel attribute to the inbound component that starts the flow
error-channel="myErrorChannel"
when an upstream component (such as your service invoked by the service-activator) throws an exception, the inbound component will put an error message on the error channel. The payload of that message is a MessagingException that has two properies:
failedMessage
cause
So, on your error flow, add a transformer...
<int:transformer input-channel="myErrorChannel"
output-channel="toJmsChannel"
expression="payload.failedMessage"
followed by your jms outbound channel adapter.
We are developing a proxy in WCF that will serve as a means of communication for some handhelds running our custom client application. I am curious what error handling strategies people use as I would rather not wrap EVERY proxy call in try/catch.
When I develop ASP .NET I dont catch the majority of exceptions, I leverage Application_Error in Global asax which can then log the exception, send an email, and redirect the user to a custom error landing page. What I am looking for in WCF is similar to this, except that it would allow me to pass a general faultreason to the client from a central location.
Basically I am curious how people centralize their exception handling in WCF apps.
Thanks
You might find the IErrorHandler interface useful here. We've been using this to do pretty much what you mention - centralised exception logging and providing generalised fault reasons without having to litter the code with numerous try/catches to try and deal with the problem locally.
So here is what I did. We have a few custom exceptions in our application such as BusinessRuleException and ProcessException, WCF supports both FaultException and FaultException<T>.
General practice seems to be that you always throw FaultException to the client in the case of a general error or an error that you dont want to display exactly what happened. In other cases you can pass FaultException<T> where T is a class with information about the particular exception.
I created this concept of Violations in the application, which basically meant that any custom exception had a property containing the corresponding Violation instance. This instance was then passed down to the client enabling the client to recognize when a recoverable error had occured.
This solved part of the problem, but I still wanted a general catch all that would allow me to centeralize logging. I found this by using the IErrorHandle interface and adding my own custom error handler to WCF. Here is the code:
public class ServiceHostGeneralErrorHandler : IErrorHandler
{
public void ProvideFault(Exception ex, MessageVersion version, ref Message fault)
{
if (ex is FaultException)
return;
// a general message to the client
var faultException = new FaultException("A General Error Occured");
MessageFault messageFault = faultException.CreateMessageFault();
fault = Message.CreateMessage(version, messageFault, null);
}
public bool HandleError(Exception ex)
{
// log the exception
// mark as handled
return true;
}
}
Using this method, I can convert the exception from whatever it is to something that can be easily displayed on the client while at the same time logging the real exception for the IT staff to see. So far this approach is working quite well and follows the same structure as other modules in the application.
We use the Exception Handling Application block and shield most faults from clients to avoid disclosing sensitive information, this article might be a good starting point for you, as with "best practices" - you should use what fits your domain.