SA-19059

Summary

User reported that agent failed with error 'java.lang.NoClassDefFoundError: com/pega/apache/log4j/spi/ThrowableInformation'.

Error Messages

Exception at 20151217T053412.907 GMT: java.lang.NoClassDefFoundError: com/pega/apache/log4j/spi/ThrowableInformation 
at com.pega.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:155) 
at com.pega.apache.log4j.Category.forcedLog(Category.java:391) 
at com.pega.apache.log4j.Category.error(Category.java:322) 
at com.pega.pegarules.priv.LogHelper.error(LogHelper.java:1345) 
at com.pegarules.generated.activity.ra_action_processexternalfeeds_f6593ab9f5a4dd7b1856704283c0a4e9.step4_3_circum0(ra_action_processexternalfeeds_f6593ab9f5a4dd7b1856704283c0a4e9.java:1187) 
at com.pegarules.generated.activity.ra_action_processexternalfeeds_f6593ab9f5a4dd7b1856704283c0a4e9.step4_0_circum0_AEXP_FW_Ent_Int_SQL_GNA_ACQ_APP_UPD_DTL(ra_action_processexternalfeeds_f6593ab9f5a4dd7b1856704283c0a4e9.java:516) 
at com.pegarules.generated.activity.ra_action_processexternalfeeds_f6593ab9f5a4dd7b1856704283c0a4e9.perform(ra_action_processexternalfeeds_f6593ab9f5a4dd7b1856704283c0a4e9.java:146) 
at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3375) 
at com.pega.pegarules.session.internal.async.agent.QueueProcessor.runActivity(QueueProcessor.java:719) 
at com.pega.pegarules.session.internal.async.agent.QueueProcessor.execute(QueueProcessor.java:600) 
at com.pega.pegarules.session.internal.async.BatchRequestorTask.run(BatchRequestorTask.java:885) 
at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1177) 

Steps to Reproduce

Not Applicable.

Root Cause

A defect or configuration issue in the operating environment. During this time noticed there were some transaction related error which caused all the database operations fail, hence above error.

Resolution

Here’s the explanation for the reported behavior:

Below prconfig.xml or DSS setting help to preload the engine classes, but does not address the underlying problem. ThrowableInformation and StackTrace are common classes to preload.

prconfig.xml setting:
--------------------------------
prconfig.xml setting: initialization/preloadengineclasses
Value: com.pega.pegarules.priv.util.StackTrace com.pega.apache.log4j.spi.ThrowableInformation
 
Note: Classes are separated by space.

DSS setting:
------------------
To set via DSS - refer https://pdn.pega.com/how-set-prconfig-values-dynamic-system-setting-value
 
Ruleset:  Pega-Engine
Purpose: prconfig/initialization/preloadengineclasses/default
Value: com.pega.pegarules.priv.util.StackTrace com.pega.apache.log4j.spi.ThrowableInformation