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Question 149

Refer to the exhibits. The Mule application does NOT define any global error handlers.

The Validation component in the private flow throws an error.

What response message is returned to a web client request to the main flow's HTTP Listener?

    Correct Answer: B

    When an error occurs in the private flow, it is handled by the 'on error propagate' in the private flow, which sets the payload to 'Child error'. Since it is an 'on error propagate', the error is rethrown and propagated back to the calling flow, which is the main flow. The main flow also has an 'on error propagate' handler which catches the propagated error. The main flow's error handler sets the payload to 'Parent error' and propagates it further, resulting in 'Parent error' being the final message returned to the web client.

Discussion
AlandtOption: C

Ignore my other comment. According to Mulesoft expert it's answer C: https://help.mulesoft.com/s/question/0D56R00008fIqYTSA0/error-handling-in-mule-4-course

marcop1Option: C

OnContinue returns the Payload, OnPropagate returns the Error object, which contains the message "Validation Error".

AntarJalilOption: C

The correct answer is "C". I've replicated this scenario in Studio to confirm it. It's crucial to note that "On error propagate" generates an "error," unlike "on error continue," which produces a successful message. Since the listener's default error response configuration is "output text/plain --- error.description " any payload set within this error handling (on error propagate) becomes ineffective. To display the actual payload set inside an "on error propagate," you need to modify the default behaviour. Change "output text/plain --- error.description" to "payload" in the Listener -> Responses -> error response section - Body.

ExamDevOption: B

If both the private flow and the parent flow have on-error-propagate elements, and the private flow's on-error-propagate specifies "Child error" while the parent flow's on-error-propagate specifies "Parent error," then the error would be propagated to the parent flow's on-error-propagate. In this case, the error message returned to the web client would be "Parent error." So, if the parent flow has an on-error-propagate element with the message "Parent error," the correct response message to the web client request in the main flow's HTTP Listener is: B. "Parent error"

Alandt

I agree with your answer

AlandtOption: B

Answer B

Alandt

I was wrong. According to Mulesoft expert it's answer C: https://help.mulesoft.com/s/question/0D56R00008fIqYTSA0/error-handling-in-mule-4-course