Attempting to use a custom component plugin results in the following error in the application server log:
YYYY-MM-DD HH-MM-SS [Appian Work Item - <WORK_ITEM_NUMBER> - <ENGINE_NAME> : CatchupRequest] ERROR com.appiancorp.process.engine.CatchupRequest - Failed to register catchup (2), can retry java.lang.NullPointerException...YYYY-MM-DD HH-MM-SS [Appian Work Item - <WORK_ITEM_NUMBER> - <ENGINE_NAME> : PublishRuleRequest] ERROR com.appiancorp.process.engine.PublishRuleRequest - Could not publish rules java.lang.NullPointerException
The errors will also be seen in the respective engine logs: <APPIAN_HOME>/logs/db_*.log.
This issue has been addressed via AN-127095 in Appian 19.1 Hotfix Package A.
Apply the latest hotfix to your Appian installation or upgrade to the latest version of Appian.
This article applies to Appian 19.1.
Last Reviewed: April 2019
© 2021 Appian. All rights reserved.