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Extra getJSON calls during delta sync



In Pega Mobility, when calling getJSON in some ways it sorts the property names in the resulting JSON output.

The JDK Collator object it uses to do that sorting has various synchronized methods that is causing contention.

Across all threads, it’s causing 55 seconds of contention that causes more than 8,000 blocks.

Seen calls to getJSON are:


com.pegarules.generated.activity.ra_action_pzdatasynchandlechanges_5707432dd9d65d06661108043dc6e30a.step1_circum0() 377899

com.pegarules.generated.activity.ra_action_pzdatasyncgetworklist_15ca5410a8797055cc1db150d98083f1.step3_circum0() 87154

Error Messages

Not Applicable

Steps to Reproduce

Perform delta sync on mobile application.

Root Cause

A defect in Pegasystems’ code or rules: unnecessary calls to getJSON() need to be removed.


Apply HFix-41097.

Published April 12, 2018 - Updated October 8, 2020

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