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500 Server Errors : pyDeleteDocumentPg called after logoff



Server error 500 occurs in two GUI based applications. An increased number of 500 errors are observed in the server logs.

Error Messages - [24/Feb/2015:12:31:29 -0800] "GET /prweb/PRServlet/i_LC2_L_GFJsMaOa4QxWBOuRaEiBsrQP*/!Developer?pyActivity=pyDeleteDocumentPg&=%26&pzFromFrame=&pzPrimaryPageName=RH_5&pyPagesToRemove= HTTP/1.1" 500 2416

Steps to Reproduce

This issue does not occur in every instance and appears to be related to some clean up activities occurring at the end of a flow. The log entries indicate that the pyDeleteDocument activity is attempting to remove a few top level pages. These logs indicate that the activity is successfully processing/removing the pages as seen below:

1. One or more successful pages removed.

pyActivity=pyDeleteDocumentPg&=%26&pzFromFrame=&pzPrimaryPageName=RH_1&pyPagesToRemove= HTTP/1.1" 200 21

2. Then this log entry indicates that the activity Code-Security.Log runs. - [24/Feb/2015:12:31:29 -0800] "GET /prweb/PRServlet/i_LC2_L_GFJsMaOa4QxWBOuRaEiBsrQP*/!Developer?pyActivity=Code-Security.LogOff&pzAuth=guest HTTP/1.1" 303 0

3. When the system then tries to continue deleting pages 500 error occurs. - [24/Feb/2015:12:31:29 -0800] "GET /prweb/PRServlet/i_LC2_L_GFJsMaOa4QxWBOuRaEiBsrQP*/!Developer?pyActivity=pyDeleteDocumentPg&=%26&pzFromFrame=&pzPrimaryPageName=RH_5&pyPagesToRemove= HTTP/1.1" 500 2416

Root Cause

The AJAX call to the pyDeleteDocumentPg activity is part of the window onBeforeUnload event if the window is a harness. This is done in the pzpega_ui_doc_lifecycle.js harnessOnBeforeUnload function. 

This should not be called if the user has triggered a logoff. 


This issue is resolved by HFix-21685 for Pega 7.1.5 and is further resolved in Pega 7.1.7.

The call to pyDeleteDocumentPg is not called if logoff has been triggered. 

Published June 12, 2015 - Updated October 8, 2020

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