%dw 2.0
import try, fail from dw::Runtime
output application/json
fun randomNumber() =
if(random() > 0.5)
fail("This function is failing")
else
"OK"
---
try(() -> randomNumber())
try
DataWeave 2.2 is compatible and bundled with Mule 4.2. This version of Mule reached its End of Life on May 2, 2023, when Extended Support ended. 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. |
try(() -> T): TryResult<T>
Evaluates the delegate function and returns an object with success: true
and result
if the delegate function succeeds, or an object with success: false
and error
if the delegate function throws an exception.
Example
This example calls the try
function using the randomNumber
function as argument.
The function randomNumber
generates a random number and calls fail
if the number is higher than 0.5. The declaration of this function is in the script’s header.
Source
Output
When randomNumber
fails, the output is:
{
"success": false,
"error": {
"kind": "UserException",
"message": "This function is failing",
"location": "Unknown location",
"stack": [
"fail (anonymous:0:0)",
"myFunction (anonymous:1:114)",
"main (anonymous:1:179)"
]
}
}
When randomNumber
succeeds, the output is:
{
"success": true,
"result": "OK"
}
Based on the output of the try
function, you can add conditional logic to execute when the result is success: true
or success: false
.