Alerts configured with an alert action are managed by the Alarm Pooled Worker. When the metrics in the metric group go above the Caution and/or Danger line, and if an action is configured on the alert, then the Alarm Pooled Worker will trigger the action and report its result.
We are seeing the following message in the MOM log. What does it mean and what could be the root cause?
"Uncaught Exception in Enterprise Manager: In thread Alarm Pooled Worker and the message is java.lang.NullPointerException"
Any APM environment with an alert and an alert action configured.
This generally has to do with what is going on at the time of the message. Alarm Pooled Worker has to do with the alerting mechanism. An example would be a problem sending an SNMP action on an alert or an incorrect email address in an SMTP action on an alert.
Best way to find out what the root cause is on the above message is to review the logging around that specific message. This will show you what alert and action is happening at the time of the message.