I'm new in BizTalk, I want to add catch exception in orchestration, but I do not see any component like CatchException in Toolbox.
How can I do this?
You can do this by adding a Scope component, then create new Exception Handler in Scope component.
Related
I have a fairly simple axon application that Im trying to apply some generic "catch all" exception handling logic to.
If I have a command that goes into an aggregate that throws some kind of exception e.g.
class UserAggregate {
//...
#CommandHandler()
public void on(CreateUserCommand cmd) {
Validate.notNull(cmd.getEmail(), "Email cannot be null");
//other processing
}
}
Then when I invoke this command from the Rest Controller, then the exception is far away from what I would expect
org.axonframework.commandhandling.CommandExecutionException: Email cannot be null
at org.axonframework.axonserver.connector.ErrorCode.lambda$static$10(ErrorCode.java:88)
at org.axonframework.axonserver.connector.ErrorCode.convert(ErrorCode.java:182)
at org.axonframework.axonserver.connector.command.CommandSerializer.deserialize(CommandSerializer.java:157)
at org.axonframework.axonserver.connector.command.AxonServerCommandBus$1.onNext(AxonServerCommandBus.java:313)
at org.axonframework.axonserver.connector.command.AxonServerCommandBus$1.onNext(AxonServerCommandBus.java:306)
at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onMessage(ClientCalls.java:429)
at io.grpc.ForwardingClientCallListener.onMessage(ForwardingClientCallListener.java:33)
at io.grpc.ForwardingClientCallListener.onMessage(ForwardingClientCallListener.java:33)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInternal(ClientCallImpl.java:596)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInContext(ClientCallImpl.java:581)
Granted the message is useful, however, this is not always a given. This can be mitigated when implementing an ExceptionHandler like so
#ExceptionHandler
public void handle(Exception exception) {
log.info("Caught Exception - {}", exception.getMessage(), exception);
}
This now gives me a stack trace pinpointing where the issue actually came from, however, this comes at the cost of having to write such an ExceptionHandler everywhere I would like to invoke this command.
Is there a more generic way to log these exceptions without having to impose the ExceptionHandler on every class issueing commands?
I would point you to the code-samples repo, where it shows a way of handling it using a MessageHandlerInterceptor.
Quoting from the repo itself:
One of the most common ways to indicate that a logical error has occurred and that Command handling failed is to throw an exception from a Command handler. However, if the exception is directly serialized there is no guarantee that the command sending side can properly deserialize the exception in question.
That is why by default Axon Framework will wrap any exception thrown inside a Command handler into a CommandExecutionException.
In short, you are going to define a MessageHandlerInterceptor responsible to try-catch the command execution logic. There you would have your centralized way of handling the CommandExecutionException.
how to handle an exception thrown from within outer catch block in bpel1.1.
I tried to publish a queue 'Q1' from bpel but i got an exception while accessing it.
Exception got handled in fault policy from where it was re thrown and got handled in a catch block. For some reason we are publishing the same queue 'Q1' again. and again we got the exception. So how can i handle that exception. Please throw some light.
There are many ways how to handle error exception in bpel.
Oracle has provided AIA framwork for BPEL message flow and error handling.
if you are using it then it has predefined templates and you have to just migrate in your code.
also for your specific scenario all catch block will help.
I working on building a simple connection with MS CRM. I am getting this 'Unconstructed message' error only when I add the Exception handler. I referred to another link Use of unconstructed message - which tells that compiler might not be sure of the message being constructed before it is handled.
But I am creating the message in a map(Transform shape) - does that not guarantees that a message is created?
Do I need to add a message assignment shape before the transform and initialize the Request message?
If you are constructing the message inside of the scope to which you have added the exception shape, then that message will be treated as Unconstructed as the exception may occur before or while the transformation occurs.
So no, the transform shape does not guarantee that the message will be constructed at all times.
Usually in this case you are better of using in your exception block the message that is on the initiating receive of your orchestration, or if you are trying to catch an exception after the transformation add a scope that starts after the transform shape and add an exception block to that.
I wrote a Windows Service that polls data on some timeintervalls and writes them in database.
But if there occures an Error writing to Database and the service stops.
I want a robust solution that goes on even if an error occures.
I put try/catch bocks around every action that is done by the service in OnStart, OnStop and Dispose but it sopped anyway.
is try/catch the correct approach?
And where do I have to put it?
Will it help to put try/catch in Main method?
Many thanks.
Try wrapping your call in a TransactionScope, this will roll back any failed changes you are trying to make and should not break on failure.
using (var scope = new TransactionScope())
{
DeleteStuff();
UpdateStuff();
scope.Complete();
}
I have a question about how to properly deal with errors. I am working on a three tiered application. If an error is created on the data tier, I would like to pass the error to the business tier and process it there. What is the best method to accomplish this? I am using .net 2.0 and visual studio 2005.
Thanks for any advice
jason
Use a Try...Catch in your business-layer with your calls to your data-layer within the Try.
Try
'call data-layer
Catch ex As Exception
'deal with exception / log
End Try
If you still want to use Try...Catch in your data-layer then you need to Throw (to preserve stacktrace) or Throw ex within the Catch, otherwise don't use Try...Catch in your data-layer at all.
Try
data = dataLayer.GetData()
Catch ex As Exception
Throw
End Try