Scheduler not running

Problem Description:

This is a specific case on v7.5.0.  Suddenly the scheduler is not sending email nor producing report output after running for years.  There are no errors in the log.

Solution:

There could be many other reasons, but there is a simple one that you can check first.  In this case, the threadCount is set too low as it is using the default.

org.quartz.threadPool.threadCount=2
org.quartz.threadPool.threadPriority=3

Increase the threadCount and see if it clears the log jam.  You might also increase threadPriority to 2 if during that time mainly report jobs are running.