Dataweave recursion limit?

Question

I have the following DW 2.0 function for trimming white space on any string values in a JSON payload:

fun whiteSpaceTrimmer(item) = item match {
    case is Array -> $ map whiteSpaceTrimmer($)
    case is Object -> $ mapObject {
        ($$): $ match {
            case is String -> trim($)
            case is Object -> whiteSpaceTrimmer($)
            case is Array -> $ map whiteSpaceTrimmer($)
            else -> $
        }
    }
    case is String -> trim($)
    else -> $
}

Since it is recursive and I am not sure how deep of a nested structure it could handle before throwing an exception. Is there a limit on how many nested elements I can pass into this function? And if so is there a better approach?

I've covered a similar concept here: https://www.jerney.io/how-to-modify-all-values-of-an-element/ — jerney, Sep 26 '19 at 01:06

score 7 · Accepted Answer · answered Sep 25 '19 at 20:23

Hi the current MaxExecutionStack is 256. So this means that your data structure can have as much as 255 levels of nestedness before it throws StackOverflow. If this number is not enough for you there is a System Property called com.mulesoft.dw.stacksize that allows you to change this value.

Dataweave recursion limit?

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