现象：

 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：

是由于Quartzschedulerthread的run方法中出现了竞态条件。

虽然代码中在各处使用了

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

仍然有考虑不全之处。

例如：现在是Quartzschedulerthread第一次扫描将要进行调度的任务，获得10个任务，第一次调度在继续向下处理，但未改变其中某些trigger state时，Quartzschedulerthread进行第二次扫描，导致相同的trigger被扫描出来，此时，第一次调度执行完成，删除掉了执行ok的trigger，而第二次调度在执行同样的trigger时，就会发生，tigger不存在的情况，因为trigger已经被第一次调度给删掉了。

解决方案：

将版本升级到2.2.1，此bug已在2.2.1的版本中修复。不过除了些异常信息外，这些并不构成大的问题。

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