Scheduled task in a web application?

 

This question already has an answer here:

  • What is recommended way for spawning threads from a servlet in Tomcat [duplicate] 6 answers

    • Quartz is your best bet, and most highly configurable. It has CRON based interface or a more dynamic way to generate jobs that are relative from a specific event, if your use case calls for it Quartz can do it. It has the ability to persist jobs to the database so they can survive restarts.

    http://www.quartz-scheduler.org/

    Make configurations in web.xml like this to auto-start it: 

      <servlet> 
    <servlet-name>QuartzInitializer</servlet-name>
    <display-name>Quartz Initializer Servlet</display-name>
    <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
    <load-on-startup>1</load-on-startup>

    <init-param>
      <param-name>shutdown-on-unload</param-name>
      <param-value>true</param-value>
    </init-param>

    <init-param>
      <param-name>start-scheduler-on-load</param-name>
      <param-value>true</param-value>
    </init-param>

  </servlet>

    You should consider:

  • Quartz
  • The "regular" TimerTask
  • If you're using spring on your webapp, there is a dedicated part for it

    • Don't bother reinventing the wheel, Quartz and other products already handle Threads/timeouts/concurrency issues for you!

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