@javax.ejb.Schedule

External

• https://docs.oracle.com/javaee/7/api/javax/ejb/Schedule.html

Internal

• EJB Annotations
• EJB Timer Service

Overview

Used by EJB to designate timeout callback methods that will be invoked by automatically-created timers.

Example:

@Schedule(hour="3", dayOfMonth="1", info="something")
public void toBeExecutedAt3AMOnTheFirstDayOfTheMonth() {
   ...
}

Configuration

The annotation is configured using a cron-like time expression, using the following attributes:

• second (if not specified, default is 0)
• minute (if not specified, default is 0)
• hour (if not specified, default is 0)
• dayOfMonth
• month
• dayOfWeek
• year

If you intend to test a time firing every other few seconds, make sure to specify hour="*" and minute="*". If they are not specified, the default values are 0 and 0, respectively, which means your timer will start firing at midnight next day, for maximum a minute.

The following example fires a timer every 20 seconds, continuously:

@Schedule(hour="*", minute="*", second = "0/20")
public void fireEvery20SecsContinously() {
   ...
}