I'm getting this problem too. I checked adobe-ds and it has the entries that you mentioned. Can you explain what's going on and how to fix it?
2009-12-09 03:01:00,004 INFO [org.quartz.core.JobRunShell] Job QUARTZ_JOBGROUP_IDP.DIRSYNC_JOB threw a JobExecutionException:
org.quartz.JobExecutionException: A full directory sync initiated through a cron setting or a user-initiated `Sync Now' action in the web console failed to start due to some other running job. This exception indicates that the full directory sync will be rescheduled to run as soon as possible.
The specific exception that you provided should not effect the system. It just happens that twojob try to run at same time . What version of ES are you. In the GM version we added some phase diff between various such job so that such collisions can be avoided
In all this specific exception can be safely ignored