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try<T>(delegate: () -> 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.

The orElseTry and orElse functions will also continue processing if the try function fails. See the orElseTry and orElse documentation for more complete examples of handling failing try function expressions.

Note: Instead of using the orElseTry and orElse functions, based on the output of the try function, you can add conditional logic to execute when the result is success: true or success: false.


Name Description


The function to evaluate.


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 greater than 0.5. The declaration of this function is in the script’s header.


%dw 2.0
import try, fail from dw::Runtime
output application/json
fun randomNumber() =
if(random() > 0.5)
  fail("This function is failing")
try(() -> randomNumber())


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"