Spring cron expression for every after 30 minutes

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南笙 2021-01-30 06:33

I have following Spring job to run after every 30 minutes. Please check my cron expression, is that correct?

\"0 0 0 * * 30\"


H

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  • 2021-01-30 06:55

    If someone is using @Sceduled this might work for you.

    @Scheduled(cron = "${name-of-the-cron:0 0/30 * * * ?}")

    This worked for me.

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  • 2021-01-30 06:59

    According to the Quartz-Scheduler Tutorial It should be value="0 0/30 * * * ?"

    The field order of the cronExpression is

    1.Seconds

    2.Minutes

    3.Hours

    4.Day-of-Month

    5.Month

    6.Day-of-Week

    7.Year (optional field)

    Ensure you have at least 6 parameters or you will get an error (year is optional)

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  • 2021-01-30 07:01

    in web app java spring what worked for me

    cron="0 0/30 * * * ?"
    

    This will trigger on for example 10:00AM then 10:30AM etc...

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:beans="http://www.springframework.org/schema/beans"
           xmlns:task="http://www.springframework.org/schema/task"
           xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/task 
        http://www.springframework.org/schema/task/spring-task.xsd">
    
        <beans profile="cron">
            <bean id="executorService" class="java.util.concurrent.Executors" factory-method="newFixedThreadPool">
                <beans:constructor-arg value="5" />
            </bean>
    
            <task:executor id="threadPoolTaskExecutor" pool-size="5" />
            <task:annotation-driven executor="executorService" />
    
            <beans:bean id="expireCronJob" class="com.cron.ExpireCron"/>
    
            <task:scheduler id="serverScheduler" pool-size="5"/>
            <task:scheduled-tasks scheduler="serverScheduler">
                <task:scheduled ref="expireCronJob" method="runTask" cron="0 0/30 * * * ?"/> <!-- every thirty minute -->
            </task:scheduled-tasks>
    
        </beans>
    
    </beans>
    

    I dont know why but this is working on my local develop and production, but other changes if i made i have to be careful because it may work local and on develop but not on production

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  • 2021-01-30 07:09

    Graphically, the cron syntax for Quarz is (source):

    +-------------------- second (0 - 59)
    |  +----------------- minute (0 - 59)
    |  |  +-------------- hour (0 - 23)
    |  |  |  +----------- day of month (1 - 31)
    |  |  |  |  +-------- month (1 - 12)
    |  |  |  |  |  +----- day of week (0 - 6) (Sunday=0 or 7)
    |  |  |  |  |  |  +-- year [optional]
    |  |  |  |  |  |  |
    *  *  *  *  *  *  * command to be executed 
    

    So if you want to run a command every 30 minutes you can say either of these:

    0 0/30 * * * * ?
    0 0,30 * * * * ?
    

    You can check crontab expressions using either of these:

    • crontab.guru — (disclaimer: I am not related to that page at all, only that I find it very useful). This page uses UNIX style of cron that does not have seconds in it, while Spring does as the first field.
    • Cron Expression Generator & Explainer - Quartz — cron formatter, allowing seconds also.
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  • 2021-01-30 07:13
    <property name="cronExpression" value="0 0/30 * * * ?" />
    
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