There is some problems with hot deploying depending on your container so
check them out first. For example:
1. If redeploying changed the layout of a CMP bean, requiring updates to the
database
2. If redeploying changed the layout of a stateful session bean old
passivated beans? Can they be thrown away?
3. What happens to active transactions?
4. We load in the new bean into its own class loader and to over-ride the
JNDI name. However, this may have some unexpected (and in some cases
unavoidable) side-effects on running clients.
Think about these things before using the hot deploy. I have been using hot
deploy in my ejb container with no problems but then again I did the
deploying during off peak time and mostly when business logic changed (the
implementation not the interface).
> -----Original Message-----
> From: Chris Raber [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, February 16, 2000 6:07 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Dynamic Class Loading with Weblogic
>
> <vendor>
> Hot deploy in GemStone/J can be done while the server is up and running
> with
> none of these constraints. Furthermore the configuration information in
> the
> directory service is updated when any provisioning is done, so there is no
> hand adjustment to do the next time you re-start the server.
>
> On-line management is a strength of GemStone/J that we designed in from
> the
> beginning.
> </vendor>
>
> -Chris.
>
> > -----Original Message-----
> > From: Colin Sampaleanu [SMTP:[EMAIL PROTECTED]]
> > Sent: Tuesday, February 15, 2000 9:36 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Dynamic Class Loading with Weblogic
> >
> > Dynamic class loading is what allows the hot deploy feature. The WL docs
> > say
> > that if you turn off the dynamic class loading (everything is on the
> > system
> > classpath), then hot deploy does not work. The documentation for hot
> > deploy
> > specifically mentions jars, and never mentions beans deployed just via
> the
> > .ser file reference, so I would have to presume that you can only hot
> > deploy
> > via jars.
> >
> > You have to disable the existing bean to hot deploy a new version of it
> > (and
> > from what I know the jar has to have a different name). I don't know how
> > you
> > can do the disable and add outside of the console, I could find no api
> to
> > do
> > it. Ultimately, I would be curious how many people are really using hot
> > deploy in WL, since it is so inconvenient to take advantage of.
> >
> >
> > > -----Original Message-----
> > > From: A mailing list for Enterprise JavaBeans development
> > > [mailto:[EMAIL PROTECTED]]On Behalf Of Peter Thomas
> > > Sent: Tuesday, February 15, 2000 4:51 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: Dynamic Class Loading with Weblogic
> > >
> > >
> > > This was also posted to the weblogic.developer.interest.ejb, but to
> > date
> > > there has been no answers.
> > > Using Weblogic Server 4.51, I have set the class paths using the
> > > recommended
> > > WL approach to allow dynamic class loading :-
> > > -classpath : contains the bare minimum
> > weblogic\classes\boot
> > > and JDK classes
> > > -Dweblogic.class.path : contains our application classes and other
> > > required WL paths
> > >
> > > However I am confused about what dynamic class loading really is ?
> > > We were hoping that we could recompile a Bean (or any other
> > > non-bean class)
> > > and that the changes would be picked up straightaway. This appears to
> > work
> > > very occasionally, but most of the time we need to restart weblogic.
> > > Our code changes DO NOT require the bean to be redeployed (i.e no
> > > signature
> > > changes etc).
> > > When are classes reloaded ?
> > > We are not using hot deploy yet (this we might try later) as our beans
> > are
> > > deployed using .sers, which I believe doesn't work ?
> > > Does the dynamic class loader only work if a bean is redeployed using
> > hot
> > > deploy ?
> > > Can anyone advise what steps we need to take to deploy using using
> JARS
> > > instead of sers ?
> > > And can anyone provide a script to allow hot redeploying using a
> script
> > > (remotely without having to visit the weblogic console) ?
> > >
> > > thanks
> > > Pete
> > >
> > > ==================================================================
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> to
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> > >
> > >
> >
> >
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