Is there a way to execute/call a Data Transform from a decision table?

General
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1

I am currently trying call one (or more) data transforms based on a decision table. Currently I am using a utility function i have created to call the data transform in the return actions. The data transform is executing properly, however when the data transform is finished, there is a java null pointer error when rejoining to the first data transform that executed the decision table.

Step Status Info LegacyDecisionAspectInvokableRuleContainer.invoke-Exception Encountered a :java.lang.NullPointerException
Exception Trace com.pega.pegarules.pub.PRRuntimeException: LegacyDecisionAspectInvokableRuleContainer.invoke-Exception Encountered a :java.lang.NullPointerException

Any way to do this OOTB or even with some custom functions?

2

@ThomasL17158130

You can try this approach.

Step 1:

Create a Data transform,

In that data transform, in step 1 call the decision table using(@Utilities.pxEvaluateDecisionTable(“Primary”,“pyCaseIconDetails”)) in source.

Step 2:

when condition Param.DecisionResult==“your condition”

Apply Data Transform

----Call the required the data transform.

Based on your condition you can call the apply data transform as per your requirement.

3

@ThomasL17158130

Hello,

Can you share us how your current utility function works in a screen capture?

4

Hi @ThomasL17158130 you could use preset properties to call either a data transform(applyModel) or activity (pxExecuteAnActivity) through a function. This will be executed first before decision table starts it execution. Based on the comparison you can call subsequent data transform in your return action.

5

@RusselK1 This is the function I am using to run DT, it is modified version of pzRunDataTransform that grabs the parameter page itself rather than passing it.

Screenshot 2025-06-17 105353.png
Screenshot 2025-06-17 105353.png726×383 51.5 KB

6

@ThomasL17158130

In Pega, you cannot directly run a Data Transform inside a Decision Table as it is meant only to return values, not to perform actions. If you try to call a Data Transform using a custom function inside a Decision Table, it may lead to errors like a null pointer exception. The best way to handle this is to return the name of the required Data Transform as a string from the Decision Table. Then, in a separate Data Transform or Activity, you can use the Apply-DataTransform method or @pxApplyDataTransform() to run the actual Data Transform. This method is safe, supported by Pega, and avoids any unexpected errors. It also keeps your rule logic clean and easy to manage

7

@Sairohith I ended up using this method as I was unable to call the Data Transform from the Decision table without getting a null pointer error. However I do not see pxApplyDataTransform as an option. Thank you.