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java.lang.ClassCastException: java.util.Date at java.sql.Timestamp.compareTo(Timestamp.java:474) at org.quartz.Trigger.compareTo(Trigger.java:611) at org.quartz.simpl.TriggerComparator.compare(RAMJobStore.java:904) at java.util.TreeMap.compare(TreeMap.java:1093) at java.util.TreeMap.getEntry(TreeMap.java:347) at java.util.TreeMap.remove(TreeMap.java:506) at java.util.TreeSet.remove(TreeSet.java:223) at org.quartz.simpl.RAMJobStore.acquireNextTrigger(RAMJobStore.java:735) at com.atlassian.scheduler.OfBizJobStore.acquireNextTrigger(OfBizJobStore.java:479) at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:197)