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Pega sporadically throws NoClassDefFoundError; needs restart



Pega 7.1.8 throws error 'java.lang.NoClassDefFoundError: com/pega/apache/log4j/spi/ThrowableInformation' when dependent REST services are down. Errors in JDBC connection pool.

Error Messages

2015-10-22 15:40:08,594 [fault (self-tuning)'] [ STANDARD] [your_accessgroup:01.01.01] ( ResumeFlow.Work_.Action) ERROR JMS|AsynchJMSServices - java.lang.NoClassDefFoundError: com/pega/apache/log4j/spi/ThrowableInformation
at com.pega.apache.log4j.spi.LoggingEvent.<init>(
at com.pega.apache.log4j.Category.forcedLog(
at com.pega.apache.log4j.Category.error(
at com.pega.pegarules.priv.LogHelper.error(
at com.pegarules.generated.activity.ra_action_pyinvokerestconnector_aff5414eb4c0d3784aade34861b0b9c0.step5_circum0(
at com.pegarules.generated.activity.ra_action_pyinvokerestconnector_aff5414eb4c0d3784aade34861b0b9c0.perform(
at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(
at com.pegarules.generated.activity.ra_action_invoke_6a91441c4f6e5048b63360383ae1b952.step7_circum0(
at com.pegarules.generated.activity.ra_action_invoke_6a91441c4f6e5048b63360383ae1b952.perform(

Steps to Reproduce

  1. Create a case through SOAP service
  2. Listener will pick up the case and process in the background
  3. Dependent domain service is down and getting error message in the Pega logs
  4. Listener is throwing error message and marking the status as Failed

Root Cause

A defect in Pegasystems’ code or rules.


Apply HFIX-24907


Published January 31, 2016 - Updated October 8, 2020

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