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When a transactional method is called by another method, it is necessary to specify how the transaction should be propagated. For example, the method may continue to run within the existing transaction, or it may start a new transaction and run within its own transaction.

Scheduler scheduler = new StdSchedulerFactory().getScheduler(); scheduler.start(); scheduler.scheduleJob(job, trigger); } } In the Main class, you first configure the job details for your file replication job in a JobDetail object and prepare job data in its jobDataMap property. Next, you create a SimpleTrigger object to configure the scheduling properties. Finally, you create a scheduler to run your job using this trigger. Quartz supports two types of triggers: SimpleTrigger and CronTrigger. SimpleTrigger allows you to set trigger properties such as start time, end time, repeat interval, and repeat count. CronTrigger accepts a Unix cron expression for you to specify the times to run your job. For example, you can replace the preceding SimpleTrigger with the following CronTrigger to run your job at 17:30 every day: CronTrigger trigger = new CronTrigger(); trigger.setName("documentReplicationJob"); trigger.setCronExpression("0 30 17 * * "); A cron expression is made up of seven fields (the last field is optional), separated by spaces. Table 18-1 shows the field description for a cron expression. Table 18-1. Field Description for a Cron Expression

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A transaction s propagation behavior can be specified by the propagation transaction attribute. Spring defines seven propagation behaviors, as shown in Table 4-6. These behaviors are defined in the org.springframework.transaction.TransactionDefinition interface. Note that not all types of transaction managers support all of these propagation behaviors. Their behavior is contingent on the underlying resource. Databases, for example, may support varying isolation levels, which constrains what propagation behaviors the transaction manager can support. Table 4-6. Propagation Behaviors Supported by Spring

1. The requirements are incomplete, and the project scope will change. 2. The tools and third-party components don t work as expected. 3. The developers lack sufficient skills and expertise. 4. The software developed will have flaws that require rework. 5. Sickness, resignations, and other projects will reduce the number of

1 2 3 4 5 6 7

If there s an existing transaction in progress, the current method should run within this transaction. Otherwise, it should start a new transaction and run within its own transaction. The current method must start a new transaction and run within its own transaction. If there s an existing transaction in progress, it should be suspended. If there s an existing transaction in progress, the current method can run within this transaction. Otherwise, it is not necessary to run within a transaction. The current method should not run within a transaction. If there s an existing transaction in progress, it should be suspended. The current method must run within a transaction. If there s no existing transaction in progress, an exception will be thrown. The current method should not run within a transaction. If there s an existing transaction in progress, an exception will be thrown. If there s an existing transaction in progress, the current method should run within the nested transaction (supported by the JDBC 3.0 save point feature) of this transaction. Otherwise, it should start a new transaction and run within its own transaction. This feature is unique to Spring (whereas the previous propagation behaviors have analogs in Java EE transaction propagation). The behavior is useful for situations such as batch processing, in which you ve got a long running process (imagine processing 1 million records) and you want to chunk the commits on the batch. So you commit every 10,000 records. If something goes wrong, you roll back the nested transaction and you ve lost only 10,000 records worth of work (as opposed to the entire 1 million).

Second Minute Hour Day of month Month Day of week Year (optional)

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