Check some of the proprietary features of BEA WebLogic.
WebLogic has startup and shutdown classes.
These classes can be scheduled so that they run at regular intervals.
It's a very common business requirement that you might want to perform
certain tasks at regular intervals.
Robert Swarr
-----Original Message-----
From: Dewayne McNair [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, February 27, 2001 11:32 PM
To: JBoss-User
Subject: Re: FW: [jBoss-User] Startup servlets when using embedded
Tomcat?
So, you don't really need a servlet, you just need JBoss to activate a
method on an object for you when it's starting up, right? There were
several posts over the last few days about creating MBeans that get
activated at startup time -- sounds like exactly what you need. Create an
MBean, register it with JBoss... should do the trick. There's nothing to
say (I think) that it has to hang around -- it should be able to do its work
and bail (I haven't used this method yet, so, if that's not right, someone
speak up).
-- Dewayne
----- Original Message -----
From: "mbiolabs" <[EMAIL PROTECTED]>
To: "JBoss-User" <[EMAIL PROTECTED]>
Sent: Tuesday, February 27, 2001 8:44 PM
Subject: Re: FW: [jBoss-User] Startup servlets when using embedded Tomcat?
> Thanks Dewayne
>
> I should have mentioned this earlier, I'm running JBoss 2.0 Final with
Tomcat
> 3.2b7 (a fairly old download, I know, but so far I haven't needed a newer
> version), with the 1.3 jdk.
>
> I'll try the <load-on-startup> element, that should should work if the
servlet
> actually executes it's code (which sets up a cache of entity beans that
other
> servlets, later, through client GET and POST requests, interact with). If
all it
> does is load the class, it's not much use - it has to execute too. I've
used
> that element in a web.xml for JRun, come to think of it, I'm not sure why
I
> thought JBoss didn't support that functionality (it is a J2EE standard
> after-all). Hopefully, that will do the trick. Sun does have this to say
about
> the element:
>
> Loading servlets at server startup may fail under certain conditions.
The
> J2EE server can load a servlet and call a servlet's
> init method when the server is started, but the results are
unpredictable.
> Such servlets include those that are registered in
> the web.xml file with a <load-on-startup> element.
>
> Hopefully JBoss does this reliably. Have you tried a startup servlet like
this
> in JBoss?
>
> I suppose the T3StartupDef in WebLogic is somewhat similar in concept
(both get
> run when the server starts up), but the servlet I have in mind executes on
> startup, leaves a cache of beans behind, and bails. Those T3StartupDefs
usually
> listen for events continually. I've used those, they're a little messy,
but
> seem to work in the end. I don't think I'd use them for what I want do.
>
> Thanks Dewayne, I think that should work.
>
>
>
> Dewayne McNair wrote:
>
> > Sorry for jumping in late... I wasn't paying attention when this thread
got
> > started, but...
> >
> > Are you talking about a _servlet_ that is loaded via the
'<load-on-startup>'
> > element in a web.xml? Or, are you talking about an _object_ that is
loaded
> > on startup -- an object that implements T3StartupDef in Weblogic, for
> > example. Or, something else?
> >
> > Also, just for the record, what version of JBoss & Tomcat are you using?
> >
> > -- Dewayne
> >
> > > Thanks David
> > >
> > > This is a little disappointing, as this sort of thing is a 3 line
> > properties
> > > file addition in other application servers (although expensive ones).
I
> > > will try to set this up, but if it takes longer than a day I will be
> > forced
> > > to un-embed Tomcat, or pay for this type of functionality.
> > >
> > > This must have been overlooked with the initial design. It's nice to
have
> > > the app server and the servlet runner working together in the same VM,
but
> > > if the functionality of the servlet runner isn't as much as it would
be by
> > > itself, it's not much use to serious development. I hope parsing
> > server.xml
> > > will clear this up.
> > >
> > >
> > >
> > >
> > > Castro, David wrote:
> > > >I believe you can do both - though I have not done it myself. I will
not
> > > >speak too much to what I do not know; if you are familiar with tomcat
(it
> > > >sounds like you are) then it should work as you expect.
> > > >
> > > >The server.xml in the binary distribution contains the interceptors
> > > >necessary to get JNDI to function correctly, and I BELIEVE this will
work
> > > >even for classes deployed directly through tomcat. You will not get
> > > >optimized classloading if you deploy directly through tomcat (unless
you
> > > >put
> > > >your interfaces/shared classes in the classpath).
> > > >
> > > >I do not know of examples and I am guessing a bit here, so keep
asking if
> > > >something does not work as you expect.
> > > >
> > > >> -----Original Message-----
> > > >> From: Colin Payne [mailto:[EMAIL PROTECTED]]
> > > >> Sent: Tuesday, February 27, 2001 12:04 PM
> > > >> To: Castro, David
> > > >> Subject: Re: FW: [jBoss-User] Startup servlets when using embedded
> > > >> Tomcat?
> > > >>
> > > >>
> > > >> Thanks David
> > > >>
> > > >> Are there any simple examples yet to go along with this that
> > > >> you know of
> > > >> (parsing server.xml)? Does this mean that you can set up contexts
in
> > > >> server.xml as well as JBoss, or is it restricted to one or the
other?
> > > >>
> > > >>
> > > >> Castro, David wrote:
> > > >> >Try downloading the new binary -
> > > >> /newsite/bin/jboss-tomcat-2.1-beta.zip
> > > >> >
> > > >> >server.xml is now parsed, so I am thinking that will solve your
> > > >> >problem...
> > > >> >
> > > >> >> -----Original Message-----
> > > >> >> From: Colin Payne [mailto:[EMAIL PROTECTED]]
> > > >> >> Sent: Tuesday, February 27, 2001 10:34 AM
> > > >> >> To: JBoss-User
> > > >> >> Subject: Re: [jBoss-User] Startup servlets when using
> > > >> embedded Tomcat?
> > > >> >>
> > > >> >>
> > > >> >> Hi Steve
> > > >> >>
> > > >> >> I should clear something up. I have successfully deployed
> > > >> the simple
> > > >> >> servlet examples using .war files and simple contexts, that
> > > >> >> is not what I'm
> > > >> >> talking about.
> > > >> >>
> > > >> >> Rather, I'm talking about a servlet which you can't hit
> > > >> through a web
> > > >> >> browser, one that is executed (and has been set up to do so,
> > > >> >> like you would
> > > >> >> normally do through Apache's server.xml) when the servlet
> > > >> >> engine (and JBoss
> > > >> >> server, in this case) starts up. I want to do this to cache
> > > >> >> a number of
> > > >> >> entity beans upon server startup. This is pretty standard
> > > >> >> functionality,
> > > >> >> WebLogic and JRun both allow you to do this, for example, as
> > > >> >> does Tomcat
> > > >> >> when you use server.xml (which is ignored in the Tomcat-JBoss
> > > >> >> configuration). There is a big difference between a startup
> > > >> >> servlet and one
> > > >> >> that you hit through a GET or POST request.
> > > >> >>
> > > >> >> If I can't execute startup servlets with the Tomcat-JBoss
> > > >> >> configuration,
> > > >> >> then it's useless to me, I'll have to run Tomcat with Apache,
> > > >> >> and let JBoss
> > > >> >> run in its own virtual machine. I must have startup servlets.
> > > >> >>
> > > >> >> Please let me know if this is still unclear.
> > > >> >>
> > > >> >> JBoss-User wrote:
> > > >> >> >> Thanks Steve
> > > >> >> >>
> > > >> >> >> I'm still a little unclear as to whether the servlet is
> > > >> >> actually run
> > > >> >> >(ie. to
> > > >> >> >> cache some objects) or is the context just registered?
> > > >> >> >
> > > >> >> >Well, here it actually runs ... I hit
> > > >> >> localhost:8080/<context name> and
> > > >> >> >there's the pages. Is that same format failing there?
> > > >> >> >
> > > >> >> >S-
> > > >> >> >
> > > >> >> >>
> > > >> >> >> JBoss-User wrote:
> > > >> >> >> >> Hello
> > > >> >> >> >>
> > > >> >> >> >> Has anyone had any success configuring and deploying a
> > > >> >> servlet that
> > > >> >> >> >gets
> > > >> >> >> >> executed upon the JBoss server startup, when using the
> > > >> >> >> >> embedded-Tomcat/JBoss configuration?
> > > >> >> >> >
> > > >> >> >> >Yes, this was no problem. I put a .war file (standard
> > > >> >> internal format)
> > > >> >> >in
> > > >> >> >> >the
> > > >> >> >> >deploy directory of jBoss. It notices this at once and loads
it
> > > >> >> >(default
> > > >> >> >> >config) and also loads it at startup.
> > > >> >> >> >
> > > >> >> >> >As far as configuring, my .war is called "ums.war" and
> > > >> >> gets assigned
> > > >> >> >the
> > > >> >> >> >context "ums", but I am not sure if these two facts
> > > >> are causally
> > > >> >> >> >connected.
> > > >> >> >> >Also, the index.html is not found when loading
> > > >> >> localhost:8080/ums, but
> > > >> >> >> >instead
> > > >> >> >> >the name must be specified
> > > >> ("localhost:8080/ums/index.html"). I am
> > > >> >> >pretty
> > > >> >> >> >sure that all this can be configured correctly through
> > > >> >> JMX but have no
> > > >> >> >> >idea
> > > >> >> >> >how yet. :)
> > > >> >> >> >
> > > >> >> >> >You can make .war files easily if you set up your project
> > > >> >> to use ant.
> > > >> >> >See
> > > >> >> >> >"Developing Applications With Tomcat" which is in the
> > > >> >> docs that come
> > > >> >> >with
> > > >> >> >> >TomCat.
> > > >> >> >> >
> > > >> >> >> >HTH,
> > > >> >> >> >
> > > >> >> >> >S-
> >
> > --
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>
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