How to control jobs in a clustered environment?

I have two questions. Can we write jobs in EJB? I mean the one like cron jobs in Unix.If so, how? I'm using web logic as application server.

Second question is: I've a job that runs every 5 seconds. It's written as a EJB. And it's available in a clustered environment.

I would like to know how can we avoid running the same job on multiple servers in a clustered environment? I mean, if job is running on one server, it should not run on other servers in a clustered environment.

Clustering is used for high availability and failover. Why do you not wish your EJB to have these?

It's a clusted environment. We are using clusters.

Hi,

I don't think u cannot use EJB as crown job.
Use quartz [ http://www.opensymphony.com/quartz/ ] as scheduler.
It can trigger EJB for any business.

HTH,
Akilan

Thanks akilan for the info.

Pls Can anybody answer my second question? TIA.

Hi,

My suggestion would be , have a DB entry ,whenever job runs.
DB will be common for the all the cluster instances.

HTH,
Akilan

Thanks again for the info!! It helped me.

EJBTimer class can also be used.

Thank you for the info.