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Support Article

queueBatchActivity fails with 'ClassCastException' error

SA-9651

Summary



Asynchronous Thread is not spawned when queueBatchActivity method is invoked on PRRequestor class. User is using below code to create asynchronous process within a new batch requestor:

tools.getRequestor().queueBatchActivity("Data-Task","newTask",tools.getParameterPage(),tools.getStepPage());

Data-Task is the class name and newTask is the Activity Name user wants to execute. When PRPC product is executing the above code, it throws an error.


Error Messages



java.lang.ClassCastException: java.lang.String incompatible with com.pega.pegarules.pub.clipboard.ClipboardPage

[4/17/15 12:18:33:189 CDT] 00000046 SystemErr R java.lang.ClassCastException: java.lang.String incompatible with com.pega.pegarules.pub.clipboard.ClipboardPage
[4/17/15 12:18:33:190 CDT] 00000046 SystemErr R at com.pega.pegarules.session.internal.async.BatchRequestorTask.<init>(BatchRequestorTask.java:456)
[4/17/15 12:18:33:190 CDT] 00000046 SystemErr R at com.pega.pegarules.session.internal.async.Agent.createBatchRequestorTask(Agent.java:1239)
[4/17/15 12:18:33:190 CDT] 00000046 SystemErr R at com.pega.pegarules.session.internal.async.Agent.queueBatchActivityForAgent(Agent.java:1321)
[4/17/15 12:18:33:191 CDT] 00000046 SystemErr R at com.pega.pegarules.session.internal.async.Agent.queueBatchActivityForAgent(Agent.java:1188)
[4/17/15 12:18:33:191 CDT] 00000046 SystemErr R at com.pega.pegarules.session.internal.async.Agent.queueBatchActivity(Agent.java:1119)



Steps to Reproduce



1. Create an Activity and include the below line in a java step.

tools.getRequestor().queueBatchActivity("Data-Task","newTask",tools.getParameterPage(),tools.getStepPage()); 

2. Test if the new Batch Process is creating an Asynchronous process.

Root Cause



The root cause of this problem is a defect in Pegasystems’ code/rules.

Resolution



This issue is resolved through the following Local-change: 

Before java step that calls 'queueBatchActivity', create a new clipboard page that is used as StepPage for java step using 'Page-New'.
Suggest Edit

Published June 12, 2015 - Updated October 8, 2020

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