On 1/16/07, Christopher Schultz <chris@(protected):
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> David,
>
> David Delbecq wrote:
> > If you run two tomcat instances, from same location, at same time you
> > will run into various troubles
>
> I think Peter Crowther hit the nail on the head: we are being imprecise
> in our terminology.
>
> I've been talking about a single installation (i.e. only one binary copy
> of Tomcat) but using several customized instances (separate conf,
> webapps, etc. directories).

where does an installation starts...?

>
> There is no trouble with doing this. I do it myself, although with only
> a single JVM version, but I know that it is possible. Another poster is
> also doing exactly what I describe and it's working just fine.
>
> > 1) The second VM will have problems binding to ports, as the first one
> > will already have claimed the port. You can argue to use different
> > config, but then it's 2 different installations.
>
> I suppose this is a matter of semantics. When I upgrade my single
> installation, I only have to do it once. If I had two copies of that
> install, then I would have to upgrade twice (one for each install).
> That's why I call this a single installation and not multiple installs.
>
> > 2) Compiling jsp might end up in java 5 format .class, which the java
> > 1.4 JVM is unable to load.
>
> Certainly, which is why you want to be careful about not accidentally
> running your 1.5-compiled stuff in 1.4, which is unlikely to happen,
> given that the OPs requirement is that one of his webapps /always/ runs
> under 1.4.
>
> > 3) you will have concurrent access to the work directory by 2 process,
> > which can lead to corrupted files.
>
> There are separate work directories, so this is not an issue.

I think you are running two different installations which share server/libs :-)

regards
Leon

>
> - -chris
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