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IllegalArgumentException during section reload



A section has a drop down on which an onChange event was added and a refresh section is set as the action. The refresh section calls a data transform and no activity call. However upon execution, there is a pop up with the error message IllegalArgumentException.

Error Messages

java.lang.IllegalArgumentException: Trying to set a parameter with invalid name "11%20Testar%20Grove%2C%20CAULFIELD%20NORTH%20%20VIC%20%203161"
    at com.pega.pegarules.session.internal.mgmt.Executable.putParamValue(
    at com.pegarules.generated.activity.ra_action_reloadsection_249bf6904c60844af4db358e7c603aba.step3_circum0(
    at com.pegarules.generated.activity.ra_action_reloadsection_249bf6904c60844af4db358e7c603aba.perform(
    at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(
    at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(
    at com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivitiesAlt(
    at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.runActivities(
    at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(
    at sun.reflect.GeneratedMethodAccessor75.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(
    at java.lang.reflect.Method.invoke(

Steps to Reproduce

1) Have a section with a UI control, e.g. a drop down. Set an onChange to trigger a refresh section. Set an activity that has a parameter. Pass a value to that parameter.
2) Run and make sure the section is working ok with the parameter being passed.
3) Edit the section and remove the activity.
4) Run the section again and trigger the refresh section.

Root Cause

The root cause of this problem is a defect in Pegasystems’ code/rules. When the activity is cleared, the section rule is suppose to remove the parameter. But this was left out.


This issue is scheduled to be resolved in Maintenance Level (ML) release 7.1.8 (BUG-196408).

Published June 12, 2015 - Updated October 8, 2020

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