[ajug-members] Scheduler in Webogic 8.1 environment ?

[Les Hazlewood]

Its important to note that the Timer references Joe makes are EJB
specific APIs, i.e. those that require an application server.  You're
operating in a Weblogic environment, so this isn't really an issue for
you (as is obvious by the title of this thread), but I make the
distinction for other folks.

I have used Quartz in many JEE and JSE environments, both without
incident.  It also supports clustered deployments.  I highly highly
recommend it - its a fantastic little library.  But, if you're already
in an app server environment, javax.ejb.Timer is probably the way to go
(unless your app server has problems clustering timed tasks, which
Quartz could help out with).

Even better, if you use Spring 2.0, you can use Spring's TaskExecutor
support, which abstracts away the implementation details, be it Quartz,
javax.ejb.Timer or java.util.Timer.  This is the clean way to go and
allows you to configure easily based on your environment (app server,
tomcat, standalone app, etc).  Super clean.

Cheers,

Les

On Sat, 7 Apr 2007 14:17:44 -0400, "Joe Sam Shirah"
<joe_sam at bellsouth.net> said:
> 
>     Hi Sony and Barry,
> 
>     Timers were introduced in J2EE 1.4.  This is probably the "blessed"
>     way
> since user threads are pretty much frowned on in managed environments.
> While Quartz specifically says "virtually any J2EE or J2SE
> application..." I
> would double verify potential thread behavior before using it or any
> other
> option.
> 
>     That's not to put down Quartz or others, just another consideration,
> although it's one that is often overlooked or ignored.  I have a client
> with
> an architect who was once a Sun employee.  He was pooh-poohing my design
> until he finally said, "Why do you do it x-way?"  I responded, "No user
> threads in JEE."  After a few moments he said, "Oh, yeah..."
> 
>     For info on Timers, see:
> 
> ONJava.com -- Using Timers in J2EE Applications
> http://www.onjava.com/pub/a/onjava/2004/10/13/j2ee-timers.html
> 
> 
> Using the Timer Service
> http://java.sun.com/j2ee/1.4/docs/tutorial/doc/Session5.html
> 
> 
> JSR 236: Timer for Application Servers
> http://jcp.org/en/jsr/detail?id=236
> 
> 
>                                                          Joe Sam
> 
> Joe Sam Shirah -        http://www.conceptgo.com
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> 
> ----- Original Message ----- 
> From: "Barry Hawkins" <barry at alltc.com>
> To: "General AJUG membership forum (100-200 messages/month)"
> <ajug-members at ajug.org>
> Sent: Saturday, April 07, 2007 12:29 PM
> Subject: Re: [ajug-members] Scheduler in Webogic 8.1 environment ?
> 
> 
> > If there is a JSR and an implementation, I don't know anyone using it.
> > The standard that has emerged (rather than some JCP attempt at
> > innovation by committee) is Quartz[0].  Pretty excellent library for
> > scheduling of automated tasks in Java.
> >
> > [0] - https://quartz.dev.java.net/
> >
> > Sony Antony wrote:
> > > Is there a J2EE level specs for job scheduling ?
> > > If not is there one provided by Weblogic server 8.1 ?
> > >
> > > We want certain jobs to run at specified time.
> > >
> > > Thanks
> > > --sony
> > [...]
> >
> > -- 
> > Barry Hawkins
> > All Things Computed
> > site: http://www.alltc.com
> > weblog: http://www.yepthatsme.com
> >
> > Registered Linux User #368650
> >
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