fail

DataWeave 2.1 is compatible with Mule 4.1. Standard Support for Mule 4.1 ended on November 2, 2020, and this version of Mule will reach its End of Life on November 2, 2022, when Extended Support ends.

Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted.

MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements.

fail(String): Nothing

Produces a failure with the specified message.

Parameters

Name Description

message

An error message (String).

Example

This example returns a failure message Data was empty instead of the desiredResult ([1,2,3]) because the expression (sizeOf(emptyArray) ⇐ 0) is true.

Source

%dw 2.0
import * from dw::Runtime
var emptyArray = []
var desiredResult = [1,2,3]
output application/json
---
if(sizeOf(emptyArray) <= 0) fail('Data was empty') else desiredResult

Output

Data was empty
Trace:
  at fail (Unknown)
  at main (line: 6, column: 25)

In the Studio console component, the output looks something like this:

ERROR 2018-07-29 11:47:44,983 ...
*********************************
Message               : "Data was empty
...

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