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Read-only data page with post load processing activity fails



Read-only data page with post load processing activity fails post updating to Pega 7.4.

Error Messages The page or property (unspecified) is read-only, and cannot be modified. Calling method: (unspecified) Details: (none) at ~[clipboard.jar:?] at ~[clipboard.jar:?] at ~[clipboard.jar:?] at pega.platform.clipboard.adapters.internal.LegacyPropertyAdapter.setValue( ~[clipboard.jar:?] at pega.platform.clipboard.adapters.internal.LegacyPropertyAdapter.setValue( ~[clipboard.jar:?] at pega.platform.clipboard.adapters.internal.LegacyPropertyAdapter.setValueFromLocalizedString( ~[clipboard.jar:?] at pega.pegarules.session.internal.engineinterface.input.HandleInput.setAndCheckPropertyValue( ~[prprivate.jar:?] at pega.pegarules.session.internal.engineinterface.input.HandleInput.handleMapping( ~[prprivate.jar:?] at pega.pegarules.session.internal.engineinterface.input.HandleInput.inputProcessing( ~[prprivate.jar:?] at pega.pegarules.session.internal.engineinterface.service.HttpAPI.mapInputData( ~[prprivate.jar:?] at pega.pegarules.session.external.engineinterface.service.EngineAPI.activityExecutionProlog( ~[prenginext.jar:?] at pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner( ~[prenginext.jar:?] at sun.reflect.GeneratedMethodAccessor102.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke( java.lang.reflect.Method.invoke( ~[?] at org.apache.tomcat.websocket.server.WsFilter.doFilter( ~[tomcat7-websocket.jar] at catalina.core.ApplicationFilterChain.internalDoFilter( ~[catalina.jar] at catalina.core.ApplicationFilterChain.doFilter( ~[catalina.jar] 
catalina.valves.AccessLogValve.invoke( ~[catalina.jar] at org. catalina.core.StandardEngineValve.invoke( ~[catalina.jar] at org.apache.catalina.connector.CoyoteAdapter.service( ~[catalina.jar] at coyote.http11.AbstractHttp11Processor.process( ~[tomcat-coyote.jar] at coyote.AbstractProtocol$AbstractConnectionHandler.process( ~[tomcat-coyote.jar] at AprEndpoint$ ~[tomcat-coyote.jar] at concurrent.ThreadPoolExecutor.runWorker( [?concurrent.ThreadPoolExecutor$ TaskThread$ ~[tomcat-coyote.jar] at

Steps to Reproduce

  1. Update Pega 7.2 to Pega 7.4
  2. Execute the data page with the post load activity

Root Cause

Issue in the way redux is designed. When a data page source is configured as a report definition, the resultant page is a flat data provider in the redux design. However, the pyRowSelected setting is allowed, even if the data page is read-only. During the post load activity, when a page or a page list is added to the data page, the structure of the data page does not remain flat. The structure of the data provider changes to a hybrid structure and the entire property becomes read-only. Hence, setting pyRowSelected to the data page is not allowed.


Apply HFix-49043.


Published August 15, 2019 - Updated December 2, 2021

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