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NullPointerException during execution of pxTransferAssignment



In trying to transfer an assignment, you sometimes encounter a NullPointerException.
Investigation of the stack trace shows that the error is originating in step 9 of the activity "pxTransferAssignment", in the When condition that is using the Rule-Utility-Function hasMessages.

Error Messages

    at com.pegarules.generated.hasMessages_060201_NkIYplDb9nAuJCnpX0y43A.hasMessages06_02_01(
    at com.pegarules.generated.hasMessages_060201_NkIYplDb9nAuJCnpX0y43A.invoke(
    at com.pega.pegarules.generation.internal.library.LibraryRuntime.resolveAndinvokeFunctionViaReflection(
    at com.pega.pegarules.generation.internal.library.LibraryRuntime.invokeLibraryRuntime(
    at com.pega.pegarules.session.internal.mgmt.Executable.invokeLibraryRuntime(
    at com.pega.pegarules.priv.generator.LibrarySupport.resolveAndInvokeFunctionViaReflection(
    at com.pegarules.generated.pega_rules_default.hasMessages(
    at com.pegarules.generated.activity.ra_action_pxtransferassignment_1a6f197486cae3e21e65cb247a71a0c8.step9_circum0(

Steps to Reproduce

Run any flow that executes the pxTransferAssignment activity.

Root Cause

The root cause of this problem is a defect in Pegasystems’ code/rules. The When condition on step 9  must be changed from @hasMessages(TransferWorkPage) to @(Pega-RULES:Default).PageExists("TransferWorkPage", tools) && @hasMessages(TransferWorkPage). This prevents an NPE when TransferWorkPage does not exist.

TransferWorkPage does not exist, when and only when, a previous step to open the work object failed. This failure prevents the creation of the TransferWorkPage.


This issue is scheduled to be resolved in  Pega 7.1.9.
Suggest Edit

Published June 29, 2015 - Updated October 8, 2020

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