Writing scheduled task with start and end time

[Ravi Lunia]

Hi guys,

I need to run a task to generate report on daily basis for every 2 hours starting 8 AM and ending at 6 PM. The code needs to be deployed with an existing application within a EAR on WAS 6.1 server.

What can be the best approach?

Thanks in advance.

[Ulf Dittmer]

If you use EJBs, you might use the Timer Service.

Otherwise, check out the java.util.Timer and TimerTask classes; they allow you to schedule code execution on a regular basis.

[Ravi Lunia]

Hi,

Thanks for the reply!

I used Timertask and Timer. But when I am using scheduleAtFixedRate(TimerTask task, long delay, long period) and implemented run method in Task class. I call this method in init of my servlet. But after some time the task starts running in more than one threads. Is there any way to avoid that.

Thanks,
Ravi

[kavuri]

I don't think it will happen.Bec init method will be called once in aservlet.how wil it create more than one thread for that task

[Ulf Dittmer]

The servlet container is free to create and remove servlets as it pleases. So if you start any threads in a servlet's init method then you should terminate those in the destroy method.

A better way to create background threads would be in a ServletContextListener, which is guaranteed to run only once at the beginning (and end) of a web app's lifetime.

[Rob Spoor]

"vamsi",

please read your private messages regarding an important announcement.

Thank you,

Rob

[Ravi Lunia]

Thanks Everyone!

I implemented it using ServletContextListener and it works just fine. I cancel the thread in the the contextDestroyed method.

Thanks for your help!