Question

How to throw an error from a microflow to be caught by standard Mendix error handling

1

When within a microflow a situation is detected which should not occur (like a comparison expression which returns false because an attribute does not match a certain value), I like to throw an error from this microflow to the calling microflow, so that higher level microflow can handle the error using the normal Mendix error handling. I thought the 'error event' was the way to go, but this does not work since (as the documentation states) : An error event defines a location where the microflow will stop and throw an error that occurred earlier. How should I throw an error from my microflow ?

asked 2016-07-07

Martin Nelisse

2 answers

Eric Tieniber · Answer 1 · 2016-07-07

Check out the CommunityCommons Java action "ThrowException"

Edit: see Mendix how-to on advanced error handling

David Sanders · Answer 2 · 2016-07-07

You can of course return a boolean value from the sub-microflow and use a split in the calling microflow based on the returned value. Set the return type to boolean in your sub-microflow and use your comparison expression to set the return value.