Set the key of an ApplicationContext reference to expose in the JobDataMap,
for example "applicationContext". Default is none.
Only applicable when running in a Spring ApplicationContext.
In case of a QuartzJobBean, the reference will be applied to the Job
instance as bean property. An "applicationContext" attribute will correspond
to a "setApplicationContext" method in that scenario.
Note that BeanFactory callback interfaces like ApplicationContextAware
are not automatically applied to Quartz Job instances, because Quartz
itself is responsible for the lifecycle of its Jobs.
Note: When using persistent job stores where JobDetail contents will
be kept in the database, do not put an ApplicationContext reference into
the JobDataMap but rather into the SchedulerContext.