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## org.springframework.scheduling.annotation
Annotation Type Scheduled

    @Target(value={METHOD,ANNOTATION_TYPE})
    @Retention(value=RUNTIME)
    @Documented
    public @interface Scheduled

Annotation that marks a method to be scheduled. Exactly one of the `cron`, `fixedDelay`, or `fixedRate` attributes must be provided.

The annotated method must expect no arguments and have a `void` return type.

Since:
  3.0
Author:
  Mark Fisher, Dave Syer
See Also:
  `ScheduledAnnotationBeanPostProcessor`

Optional Element Summary
`String` | `cron` A cron-like expression, extending the usual UN*X definition to include triggers on the second as well as minute, hour, day of month, month and day of week.
`long` | `fixedDelay` Execute the annotated method with a fixed period between the end of the last invocation and the start of the next.
`long` | `fixedRate` Execute the annotated method with a fixed period between invocations.

### cron

    public abstract String cron

  A cron-like expression, extending the usual UN*X definition to include triggers on the second as well as minute, hour, day of month, month and day of week. e.g. `"0 * * * * MON-FRI"` means once per minute on weekdays (at the top of the minute - the 0th second).

  Returns:
    an expression that can be parsed to a cron schedule
  Default:
    ""

### fixedDelay

    public abstract long fixedDelay

  Execute the annotated method with a fixed period between the end of the last invocation and the start of the next.

  Returns:
    the delay in milliseconds
  Default:
    -1L

### fixedRate

    public abstract long fixedRate

  Execute the annotated method with a fixed period between invocations.

  Returns:
    the period in milliseconds
  Default:
    -1L

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