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Support Article

IllegalArgumentException generated in the logs



IllegalArgumentExceptions are generated in the Pega logs. As a result, a blue screen displays and users must log out and relog in to continue.

Error Messages

java.lang.IllegalArgumentException: There is no thread named "TABTHREAD1"
    at com.pega.pegarules.session.internal.mgmt.base.RequestorPassivation.removeInactiveThread( ~[prprivate.jar:?]
    at com.pega.pegarules.session.internal.mgmt.PRRequestorImpl.removeInactiveThread( ~[prprivate.jar:?]
    at com.pegarules.generated.activity.ra_action_freeclipboard_dbb74b720036b41125f73cb5b58a0869.step5_circum0( ~[?:?]
    at com.pegarules.generated.activity.ra_action_freeclipboard_dbb74b720036b41125f73cb5b58a0869.perform( ~[?:?]
    at com.pega.pegarules.session.internal.mgmt.Executable.doActivity( ~[prprivate.jar:?]
    at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity( ~[prprivate.jar:?]
    at com.pegarules.generated.activity.ra_action_redirectandrun_961ec9cb5b6f14135240c2216100a0be.step3_circum0( ~[?:?]
    at com.pegarules.generated.activity.ra_action_redirectandrun_961ec9cb5b6f14135240c2216100a0be.perform( ~[?:?]

Steps to Reproduce

Allow the system to be in the Idle state for a few minutes.

Root Cause

A defect in Pegasystems’ code or rules.
The FreeClipboard activity displays the exceptions as part of the Thread cleanup.


This feature is implemented in Pega Platform 8.2.6.

Published December 2, 2021

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