Re: Issues when updating running apps?

Hi everyone,

I apologize for insisting on this matter, but so far I haven't been able=20
to find info on this anywhere. I've looked at tomcat's and openoffice's=20
spec files as examples of packaged java apps, but it doesn't seem they=20
take any sort of precaution when updating. Is it really not an issue if=20
the app happens to be running at the time?

As for updating a database schema accessed by our app, I suppose we=20
could add that logic to the app itself and have it check before it=20
starts whether it should modify the database, but I find adding scripts=20
in the RPM much easier and I'd prefer any problems with the=20
modifications to come up the moment the update is applied and not=20
whenever the app is next started.

I'd really appreciate any comments you could give me on this, whether=20
they are direct answers, indirect tips on how I could find this info, or=20
kind advice to go RTFM (as long as you tell me which FM in particular=20
that would be :) )

I thank you all already for your time.

Regards.

Adri=E1n.

Adri=E1n M=E1rques escribi=F3:
> Hello all,
>
> I have a very basic question I hope someone can help me with.
>
> I'm not sure on how to package an application so that updating it=20
> while it's running won't cause any problems. For instance, I'm=20
> packaging a quite typical java app that has a swing GUI and stores its=20
> data in a database. In the event of an update requiring modifications=20
> to the database schema I had thought of including these in the %pre or=20
> %post sections, but I assume this could lead to the app breaking to=20
> pieces if the old version is running when the changes meant for the=20
> newer version are made. A similar problem could occur if I update some=20
> jar and the running app happens to load some classes from it that=20
> won't work properly with the older version. Am I making any sense with=20
> this?
>
> How can I get around these issues? are there other I should look out=20
> for that I'm not considering?
>
> I'd highly appreciate any advice/tips/links you could give me.
>
> Regards.
>
> Adri=E1n.
>
>
>