Quick notes on using jcrontab

Simple scheduler providing crond like features.

Steps to use jcrontab

1. Add the following declaration in web.xml

  <servlet>
    <servlet-name>JCrontabLoaderServlet</servlet-name>
    <servlet-class>org.jcrontab.web.loadCrontabServletCL</servlet-class>
    <!-- can overwrite the parameters from jcrontab.properties -->
    <!-- simply adding here the right parameters -->
    <init-param>
      <param-name>org.jcrontab.data.file</param-name>
      <param-value>crontab</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

1. Put the jcrontab.properties in WEB-INF/classes/
2. Put the crontab in WEB-INF/classes/

Format for the crontab

The time format of crontab is exactly the same as Unix crontab. The job part is a fully qualified class name (eg: org.someproject.MyJob)

So the following line will instruct JCrontab to start MyJob every 3 minutes.

  */3 * * * * org.someproject.MyJob