現象：

 1 [o.q.c.ErrorLogger] - An error occurred while scanning for the next triggers to fire.
 2  org.quartz.JobPersistenceException: Couldn't acquire next trigger: Couldn't retrieve trigger: No record found for selection of Trigger with key: 'DEFAULT.6da64b5bd2ee-894279e1-a6bd-4151-bb9d-77acf5647ade' and statement: SELECT * FROM QSMS_SIMPLE_TRIGGERS WHERE SCHED_NAME = 'xxx' AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?
 3      at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTrigger(JobStoreSupport.java:2840) ~[quartz-2.1.5.jar:na]
 4      at org.quartz.impl.jdbcjobstore.JobStoreSupport$40.execute(JobStoreSupport.java:2746) ~[quartz-2.1.5.jar:na]
 5      at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3811) ~[quartz-2.1.5.jar:na]
 6      at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTriggers(JobStoreSupport.java:2742) ~[quartz-2.1.5.jar:na]
 7      at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:264) ~[quartz-2.1.5.jar:na]
 8  Caused by: org.quartz.JobPersistenceException: Couldn't retrieve trigger: No record found for selection of Trigger with key: 'DEFAULT.6da64b5bd2ee-894279e1-a6bd-4151-bb9d-77acf5647ade' and statement: SELECT * FROM QSMS_SIMPLE_TRIGGERS WHERE SCHED_NAME = 'xxx' AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?
 9      at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveTrigger(JobStoreSupport.java:1524) ~[quartz-2.1.5.jar:na]
10      at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTrigger(JobStoreSupport.java:2790) ~[quartz-2.1.5.jar:na]
11      ... 4 common frames omitted
12  Caused by: java.lang.IllegalStateException: No record found for selection of Trigger with key: 'DEFAULT.6da64b5bd2ee-894279e1-a6bd-4151-bb9d-77acf5647ade' and statement: SELECT * FROM QSMS_SIMPLE_TRIGGERS WHERE SCHED_NAME = 'xxx' AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?
13      at org.quartz.impl.jdbcjobstore.SimpleTriggerPersistenceDelegate.loadExtendedTriggerProperties(SimpleTriggerPersistenceDelegate.java:95) ~[quartz-2.1.5.jar:na]
14      at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.selectTrigger(StdJDBCDelegate.java:1801) ~[quartz-2.1.5.jar:na]
15      at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveTrigger(JobStoreSupport.java:1520) ~[quartz-2.1.5.jar:na]
16      ... 5 common frames omitted
17

View Code

原因：

是由於Quartzschedulerthread的run方法中出現了競態條件。

雖然代碼中在各處使用了

synchronized(this.sigLock) {
    //TO DO      
}

仍然有考慮不全之處。

例如：現在是Quartzschedulerthread第一次掃描將要進行調度的任務，獲得10個任務，第一次調度在繼續向下處理，但未改變其中某些trigger state時，Quartzschedulerthread進行第二次掃描，導致相同的trigger被掃描出來，此時，第一次調度執行完成，刪除掉了執行ok的trigger，而第二次調度在執行同樣的trigger時，就會發生，tigger不存在的情況，因為trigger已經被第一次調度給刪掉了。

解決方案：

將版本升級到2.2.1，此bug已在2.2.1的版本中修復。不過除了些異常信息外，這些並不構成大的問題。

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